Abstract
One of the most significant cultural transformations in European prehistory occurred in the middle of the 6th millennium BC in the heart of the Carpathian Basin. The northward expansion of Mediterranean farming groups (Starčevo-Körös-Criş cultural complex) halted and underwent a complete transformation giving rise to a new cultural group carrying an altered form of Neolithic traditions onward to Europe. This transformation is restricted to sites along a boundary found in the heart of the basin, north of which unfavorable ecological conditions hampered a long-term engagement in a Mediterranean type of agriculture. The majority of Early Neolithic Körös sites in eastern Hungary are confined to the alluvial plain of the Tisza River prone to natural biannual flooding. These wetland conditions were marginal for early farmers as it contained several elements that were hostile for herded animals and these groups were not adopted to cope with. Körös Culture pastoralists responded to these challenges posed by the new environment by complementing their diet with opportunistically exploited wild resources. This type of resilience of the first farmers seen in the alteration of traditional subsistence strategies was simply attributed to the static hostile conditions of the environment alone. Influence of dynamic changes in the hydrology has not been studied and documented so far. This paper presents a multiproxy archeomalacological approach to establish a mid-Holocene flood record in Southern Central Europe and assess the potential impacts of flood frequencies, climate change-induced higher floods on economic, societal development of the first farming groups from the heart of the Carpathian Basin. Based on our findings, intensified use of second-line subsistence resources marking resilience is coeval with intensified flooding during the second phase of cultural evolution preceding transformation. This marked transformation could have been traced regionally as well along the referred northern distribution line and is coeval with the initial phase of a minor climatic perturbation refered to as the IRD 5.b event. The southward expansion of cold waters in the North Atlantic yielded intensive cyclonic activity bringing more rain and cold weather to W Europe. In Hungary, higher continentality provided by the basin setting preserved warmer conditions. Nevertheless, increased rainfall onto the watershed of major rivers triggered heightened floods.
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Introduction
Foraging is among the most ancient subsistence forms characterizing human communities before 10 kys in general. However, the introduction of farming and herding by no means meant a complete disappearance of this lifestyle among the very first food-producing societies. Foraging must have remained an important part of daily subsistence (Childe 1956; Legge and Rowley-Conwy 1987; Plug and Voight 1985; Szuter and Bayham 1989; Zvelebil and Dolukhanov 1991), probably because flexible opportunistic agricultural systems, like reliance on multiple resources aimed at diversifying landscape capital, offer an advantage of greater economic security if there are fluctuations in the weather, water supply, or during periodic die-offs of crop yields (Messerli et al. 2000; Pfister et al. 1999; Pfister 2001; Redman 2005; Haldon and Rosen 2018; Xu et al. 2019; Yang et al. 2019). Fluctuations in available food sources are most likely the result of a complex interplay of various environmental (climatic) (Carré et al. 2009; Coombes and Barber 2005) and social (behavioral) factors (Messerli et al. 2000; Speth 1990; Spielmann 1986). Hostility of the environment or rapid, sudden deterioration in natural endowments may put forth an increased reliance on second-line resources in subsistence like foraging or hunting (Broughton 1999; Polyak and Asmerom 2001; Butler and Campbell 2004; Berger and Guilaine 2009; Weninger et al. 2006; Drysdale et al. 2006; Weiberg and Finné 2018; Xu et al. 2019). The nature of responses deployed to these is dependent on the level of resilience or vulnerability of the given society seen in its ability to face changes (Redman 2005; Kuper and Kropelin 2006; Pfister and Brazdil 2006; Berger and Guilaine 2009; Salisbury and Bácsmegi 2013; Haldon and Rosen 2018; Weiberg and Finné 2018; Xu et al. 2019; Yang et al. 2019). It entails the knowledge of local endowments and the distribution of potentially available subsistence resources which can easily be brought online in case of a socio-economic crisis (Rockman 2003; Meltzer 2003; Anthony 1990; Messerli et al. 2000; Pfister et al. 1999; Redman 2005; Carré et al. 2009; Nagaoka 2002, 2005; Gulyás 2011; Gulyás and Sümegi 2004, 2011a,b, 2012a,b; Gulyás et al. 2007). It also determines whether or not environmental perturbations can be devastating for social development (Redman 2005; Haldon and Rosen 2018; Weiberg and Finné 2018; Xu et al. 2019; Yang et al. 2019).
One of the most significant cultural transformations in European prehistory occurred in the middle of the 6th millennium BC in the heart of the Carpathian Basin (Kutzián 1944; Kalicz 1970; Raczky 1978, 1983, 1986; Raczky et al. 2010; Sümegi and Kertész 1998, 2001). The northward expansion of Mediterranean farming groups (Starčevo-Körös-Criş Cultural Complex) came to a halt and underwent a complete transformation both in subsistence pattern and material culture giving rise to a new cultural group (Linear Pottery Culture), one variantFootnote 1 of which spread the Neolithic package to the rest of Western and Northern Europe (Kalicz 1970; Raczky 1978, 1983, 1986; Bánffy 2000, Bánffy 2004a, 2004b, 2006; Whittle et al. 2002; Whittle 2007; Oross and Bánnfy 2009). On the scale of the entire basin, this happened along a clearly discernible boundary with an approximately NE-SW orientation, north of which climatic, soil, and vegetation conditions hampered the long-term engagement in a Mediterranean type of agriculture based on cultivation of warmth-loving plants and caprines (Fig. 1). This boundary was nominated the Central European Balkanic Agroecological Barrier (Sümegi and Kertész 1998; Sümegi 2001, 2003a, 2003b, 2006, 2008; Raczky et al. 2010). Surprisingly, the mentioned transformation is observable in sites along the referred marginal distribution areas of of the Körös Culture. Classical Mediterranean farming remained relatively unaltered in the southern distribution areas (Whittle et al. 2002; Whittle 2004; Raczky et al. 2010).
Thanks to new 14C data and archeological finds (Domboróczky 2003, Domboróczki 2010; Bánffy and Oross 2010; Oross and Siklósi 2010) we now have a relatively good overview of how the representatives of the first farmers (Körös Culture) spread north in the Great Hungarian Plains (GHP). The Starčevo Culture crossed the Lower Danube around 6200 cal BC. The Körös Culture reached the Maros around 6000 cal BC and it took another 100–150 years (5900–5850 cal BC) for them to reach the branches of the Körös River and the Middle Tisza Region (Raczky 1986; Raczky et al. 2010; Domboróczky 2003, 2005). The final colonization of the Upper Tisza Region in the northeastern parts of the GHP occurred between 5770 and 5530 cal BC (Whittle 2007; Whittle et al. 2002; Domboróczky 2003, 2005, Domboróczki and Raczky 2010; Raczky et al. 2010).
The majority of Early Neolithic (Körös Culture) sites in eastern Hungary are confined to the alluvial plain of the Tisza, Hungary’s second largest stream and its tributaries (Roberts 1998; Nandris 1972; Kosse 1979; Sherratt 1982; Sümegi 2003b). The area of the Great Hungarian Plain preceding the nineteenth century river regulation measures was frequently inundated by biannual floods of the Tisza and its tributaries creating vast wetland areas, most of which remained under water for the major part of the year. Although flooding is a substantial risk for settling communities, their contribution to the ecosystem functioning is crucial. These iterative floods on the one hand ensured a constant supply of organic-rich matter onto the floodplain. On the other hand, they also served to compensate for loss in water supply attributed to the climatic endowments of the area, since the heart of the basin is considered to be the driest part of Central Europe thanks to the extremely high continentality rates (annual rainfall below 300 mm during growth season). Thus, the selection of a floodplain environment for settling, despite the risk of normal seasonal flooding, has numerous advantages as these complex habitats with a diverse natural flora and fauna, and soils provide multiple sources of subsistence and permanent water supply (Gardner 2005; Gillings 2007; Raczky et al. 2010). Conversely, wetland conditions were marginal for early farmers engaged in a Mediterranean type economy based on herding caprines. It contained several elements that were hostile for herded animals and these groups were not adopted to cope with (Raczky et al. 2010). Signs of water-induced stress are clearly attested by paleopathological observations made on small ruminant bones from numerous Körös Culture sites showing marks of arthritic inflammation and osteoporosis of foot bones and skulls (Bartosiewicz 2005, 2006, 2007; Raczky 2012; Raczky et al. 2010). Sheep fetal remains recovered from the Körös site of Nagykörü, found at the culture’s northern distribution line, is another indicator of environmental pressure on ewe causing miscarriage (Bartosiewicz 2005, 2006, 2007; Raczky 2012; Raczky et al. 2010). Körös Culture pastoralists responded to these challenges posed by the new environment by complementing their diet with opportunistically exploited wild resources (Bartosiewicz 2005, 2006, 2007; Pike-Tay et al. 2004; Raczky 2012; Raczky et al. 2010, SFig. 1). In the Upper and Central Tisza Region, the Körös Culture settlements coexisted with the earliest ALP types between 5620 and 5530 cal BC forming a transitional region of the two cultures (Domboróczky 2003, 2005; Domboróczki and Raczky 2010; Raczky et al. 2010). Thus, the earliest ALP in these areas along the northern frontier of the Körös Culture must have developed between 5620 and 5470 cal BC. This period of overlap was relatively short implying a rapid transformation. There is a marked change in subsistence to animal husbandry and a decrease in second-line resources (Domboróczky 2003, 2005, Domboróczki and Raczky 2010; Raczky et al. 2010).
It is important to note that this type of resilience of the first farmers seen in the alteration of traditional subsistence strategies is only partially attributable to the unique, previously unknown conditions of the floodplain habitats. According to the available geoarcheological data from the Körös sites in the marginal zone of the culture’s distribution area, settlements were gradually displaced onto flood-free natural highs (lag-surfaces) of the floodplain parallel with the evolution of the culture (Sümegi 2003b). This can clearly mark an adaptation to increased water levels on the floodplains reducing social and economic areas. So far, however, the general hostility of the environment alone was considered a major push factor in adaptation of the new farmers (Sümegi and Kertész 1998; Sümegi 2001, 2003a, 2003b, 2006, 2008; Raczky 2012; Raczky et al. 2010). The dynamic nature of climate-induced hydrological changes has not been considered or documented so far.
High-resolution, sub-centennial paleoenvironmental data reflecting local and regional endowments of terrestrial and riparian habitats near Körös sites along with potential temporal perturbations are generally lacking. The few studies available tackling the problem do not provide information on long-term temporal changes just a momentary uniform hydrological picture of the landscape at the time of the settlement (Sümegi 2003a, 2004, 2007; Sümegi and Molnár 2007; Sümegi et al. 2005; Whittle 2007; Gulyás 2011; Gulyás and Sümegi 2004; Gulyás and Sümegi 2012a, 2012b; Gulyás et al. 2007).
Thus, in order to see whether or not long-term climate induced potential hydrological transformations influenced human behavior, causing initially the introduction and later the abandonment of new second-line freshwater and wild resources into the diet with the emergence of the Alföld Linear Pottery Culture, new results of a multiproxy paleoecological analysis implemented on archeological mollusk material of a Körös site in the Middle Tisza region found in the referred marginal distribution area are presented here. The study site is dated from the first appearance of the Körös Culture to the period preceding the previously referred cultural transformation leading to the emergence of the Alföld variant of Linear Pottery Culture (Raczky et al. 2010; Gulyás 2011; Gulyás and Sümegi 2012a, 2012b; Gulyás et al. 2010; Moskal-del Hoyo 2013). Thus, our results provide an ideal temporal record of water quality changes in the surrounding floodplain on the one hand, since freshwater mollusks collected by humans characterize the quality of the water body from which they derive. Furthermore, they are also an excellent marker of socioeconomic response to environmental stress hallmarking the deployment of multifocal subsistence strategies in agriculturalist groups. Terrestrial mollusks on the other hand may shed light onto compositional changes in the vegetation near the sites themselves, as well as potential fluctuations in the local paleotemperature and humidity (Evans 1972; Sümegi 1989; Sümegi and Krolopp 2002). This way we can get a better overview of temporal climatic, hydrological changes of the riparian environment, and potential underlying causes from the first appearance to the transformation of the Körös culture group in the northern GHP.
General characteristics of the study site
The study site of Nagykörü-Orchard is located on the northern boundary of distribution of the Early Neolithic Körös culture in the Carpathian Basin (Raczky et al. 2010; Moskal-del Hoyo et al. 2010; Moskal-del Hoyo 2013). The site itself is found on a loess-covered ancient (Pleistocene) levee (92 m ASL) along the right banks of the River Tisza, Hungary’s second largest stream about 25 km northeast of the city of Szolnok (Fig. 2a). The surrounding Holocene floodplain of the Tisza with an average elevation of 82 m is built up of a complex network of adjacent meander scars, oxbow-lakes, backswamps, island-like lag-surfacesFootnote 2, and abandoned channels of minor watercourses, which acted as floodwater drains during the Holocene (Fig. 2b).
Preceding the nineteenth century river regulations more than 60% of the area around the site enjoyed permanent water coverage. The geomorphological, as well as the recent climatic endowments of the area with enhanced continentality and relatively high temperatures during the growth period (17.2 °C), fundamentally determined the evolution of soil and vegetation types, as well as the hydrology of the area yielding a mosaic of plants and soils forming a hydroseries (Raczky et al. 2010; Moskal-del Hoyo et al. 2010, Moskal-del Hoyo 2013). The relatively higher continentality is seen in the high number of hours of sunshine to the area as well, favorable from the point of view of a Mediterranean-type of agriculture.
The studied shellfish material comes from a Körös test pit located on top of the referred natural high. Excavations initiated in 2003 were aimed at taking representative samples from the pit along a square of 3 × 3 m and not to recover the entire pit itself (Fig. 2c) (Csányi 2003; Raczky et al. 2010; Raczky 2012; Moskal-del Hoyo 2013). However, block sampling along a vertical profile, plus absolute dating of most Körös block samples, enabled us to study temporal aspects of site evolution as well. Altogether, 9 block samples were taken to a depth of ca. 1.5 m. The upper three blocks assigned to Feature 1 to a depth of 0.45 m (F1S1-F1S3) represent the modern soil. The underlying 6 blocks of Feature 2 (F2S4, F2S7, F2S813, F2S914, F2S1015, F2S1116) correspond to the material of the actual Körös test pit (Raczky 2012). Radiocarbon dating yielded an age of 5850–5620 cal BC at the level of 1 σ uncertainty (p = 0.68) generally used and accepted by archeologists (Fig. 2c) (Raczky et al. 2010; Gulyás 2011; Gulyás and Sümegi 2012a, 2012b; Gulyás et al. 2010; Moskal-del Hoyo et al. 2010, Moskal-del Hoyo 2013; Oross and Siklósi 2010). To provide better constraint on dates of site use start and abandonment at the 2 σ level of uncertainty, a new age model using dates listed in Oross and Siklósi (2010) was built in Oxcal 4.1. (Bronk Ramsey and Lee 2013), results of which are presented here. All input data were provided as 14C y BP and the model used the northern hemisphere IntCal13 calibration curve (Reimer et al. 2014) (Fig. 2, STable 1). According to this new model, site use must have started between 6075 and 5872 cal BC years (5963± 63 cal BC years, p = 0.954) (STable 1). The first phase corresponding to the F2S7 block ended between 5730 and 5643 cal BC (5692± 23 cal BC years, p = 0.954). The end of site use must be put between 5711 and 5539 cal BC (5634± 47 cal BC years, p = 0.954) (Figs. 2 and 3, STable 1). The first transitional AVK groups displaying a mix of Körös and AVK features and marking the time of the referred cultural and economic transformation appear at the nearby site of Kőtelek-Huszársarok (Figs. 2a, b and 3) somewhere around 5720 and 5530 cal BC years (Raczky 1986; Raczky et al. 2010; Domboróczky 2003, 2005). Thus, our material with a span of ca. 330 years represents the period from the first appearance of the Körös culture in the Middle Tisza region up to its transformation period. The nearby Körös site of Ecsegfalva 23 (Fig. 2a), the most well-documented so far, falls into the second half of our site use of phase 1 preceding the time of cultural transformation (Fig. 3) (Whittle et al. 2002; Whittle 2007, 2012). Careful sampling and comparison of our findings with results gained for this latter contemporary site thus allowed for capturing the dynamics of hydrological changes on the floodplain during the referred transformation period at a scale of decades.
Material and methods
Faunal changes observable in the archeological material must be attributed to various factors, if we appreciate the human or cultural context of the material. Abundance of certain faunal elements in our freshwater shellfish material is the outcome of the complex interplay of various biotic (predation including humans) and abiotic ecological components (substrate conditions, hydraulic parameters, water temperature, pH, bioproduction, sediment accumulation etc.) (Erman and Erman 1984; Byers and Broughton 2004; Wolverton 2005). Thus, changes observable in faunal abundances can indicate subsistence change and resource selection resulting from increased foraging pressure on the one hand. On the other hand, environmental change can also reduce the abundance of certain faunal elements independent of human predation. Thus, to resolve issues of temporal change observable in the studied archeofauna, a complex analysis of several lines of information is needed (Peacock and Seltzer 2008; Rustioni et al. 2007). In order to identify units of similar paleobiological content reflecting similar environmental or habitat conditions, the collective handling of ecological information of the studied taxa and faunal abundance values is needed. For this, several widely adopted explorative multivariate statistical methods are known (Digby and Kempton 1987; Chatfield and Collins 1980; Davies 1998). In our work, DCA (detrended correspondence analysis) was implemented on a taxon/abudance data matrix per sample following the methods of Hill and Gauch Jr (1980), Behrensmeyer (1991), and Rustioni et al. (2007). Faunal composition based on abundance was determined using the measure minimum number of individuals (MNI) (Nichol and Wild 1984; Peterson 1989; Lyman 1994; Claasen 1998). Taphonomy of the shells was also considered via quantification of intact and broken shells as well as the ratio of right and left valves (Behrensmeyer and Hill 1980; Behrensmeyer et al. 2000). Ecological characteristics of the individual species were gleaned from studies of the modern fauna using the works of Sümegi (1989), Krolopp and Sümegi (1995), Sümegi and Krolopp (2002), Evans (1972), and Ložek (1964). Eigenvalues received during DCA were used to describe information expressed by the faunal composition of the sample as whole. Visual evaluation of the scatterplot enabled the interpretation of the ecological meaning of the received eigenvalues. Thus, the received axes were identified to reflect major ecological gradients, i.e., changes in water-velocity, substrate type in our interpretations.
In order to retain further ecological parameters of the studied aquatic habitats, shells were subjected to geochemical analysis. Some of the routinely recorded trace elements in shells are excellent markers or proxies of certain parameters of the studied water bodies. Mn2+ has been proposed as indicator of algal productivity (Vander Putten et al. 2000; Langlet et al. 2006, 2007; Caroll and Romanek 2008; Siegele et al. 2001; Lazareth et al. 2003) and as such an ideal proxy of the rate of dissolved oxygen in the water (Mutvei and Westermark 2001; Ravera et al. 2003, 2007; Caroll and Romanek 2008). Fe2+ and Zn2+ are soluble in relation to the acidity of the medium and as such may record fluctuations in the pH (Stumm and Morgan 1996; Mutvei and Westermark 2001). According to Lee and Wilson (1969) and Hill (1975), rivers with a larger discharge tend to be more dilute and as such relatively deprived of dissolved elements compared with rivers with a lower discharge. Consequently, a negative shift in general concentration values of trace elements may also reflect a transformation in discharge values of a fluvial system. Shells of the same mussel (Thick-shelled river mussel-Unio crassus Retzius 1788) and aquatic snail taxa (River snail-Viviparus acerosus (Bourguignat 1862)) were chosen for our geochemical analysis in order to avoid discrepancies deriving from taxon-specific incorporation of the studied elements. Samples were acid digested on hot plate following a modified procedure of Szöőr et al. (1992) and Peacock and Seltzer (2008). Mn, Fe, and Zn concentrations were recorded using the flame AAS technique in a Perkin-Elmer AAS type 100 at the Department of Geology and Paleontology, University of Szeged, Hungary.
Another good source of information regarding paleoenvironmental conditions of freshwater systems is that of the concentration of certain isotopes as shown by numerous studies on modern marine and freshwater shellfish taxa (Dettman et al. 1999; Versteegh 2008; Caroll et al. 2006; Davies and Muehlenbachs 2001; Gustafson et al. 2007; Peacock and Seltzer 2008). Stable isotopes of oxygen and carbon were measured in selected shell samples at the Institute of Geochemistry, Hungarian Academy of Sciences using a Finnigan type 500 ICP-MS. Values are reported in per mil with reference to the VPDB standard.
Statistical analysis including Kruskall-Wallis test, similarity, and correlation analyses were performed following the methods of Sokal and Rohlf (1995) to explore and clarify the relationship among the gained variables. Statistical significance was assumed when p < 0.05 and 0.01, respectively (Hammer and Harper 2005).
Results
Taxonomic composition of the fauna
The studied material yielded 14,542 specimens of 8 freshwater (4 bivalve & 4 gastropod) and 9 terrestrial taxa representing ca. 10,000 individuals. The ratio of mussels and snails was relatively the same (54.82 and 45.18%, respectively) most likely attributable to the artificial nature of the deposit. The extremely low proportion of terrestrial taxa compared with the freshwater one (2.78%) is another indication of the origin of the material. Elements with a preference for moving-water conditions (rheopylic) and a sandy substrate are dominant in the fauna (81.38%). Conversely, the amount of those preferring standing or temporarily moving waters and a muddy substrate is almost negligible (18.62%). The ratio of the rheophylic river snail (Viviparus acerosus (Bourguignat 1862)) dwelling on aquatic vegetation and that of the thick-shelled river mussel (Unio crassus Retzius 1788) preferring a sandy substrate in our pit material is also relatively even (38.54 and 36.36%), again reflecting the nature of the deposit. The amounts of snails populating minor ponds, great ramhorn snail-Planorbarius corneus (Linnaeus 1758), great pond snail-Lymnaea stagnalis (Linnaeus 1758), are also minimal (0.15%) similarly to that of the pond-dweller pond mussel (Anodonta cygnea (Linnaeus 1755)) (1.19%). They must have ended up in the deposit either as a side-product of fishing and shellfishing or natural colonization of the inundated pit as a result of an elevated groundwater table in case of the gastropods. The general composition of the entire fauna implies the development of a floodplain with a large variety of multiple ecotones of backswamps, oxbow lakes with a lush aquatic vegetation and a dominance of areas enjoying moving-water conditions and a sandy substrate (Fig. 2). The general composition of the terrestrial mollusk fauna indicates warm, balanced climatic conditions with mean July paleotemperatures around 22 °C, slightly higher than the modern value in accordance with the concept of a climatic optimum. Roughly, half of the terrestrial fauna was given by hygrophilous elements inhabiting wet meadows and shady areas of forest steppes. The other half was given by xerophylous elements populating grasslands, so the duality of the terrestrial fauna also reflects a rather mosaic-like nature of the terrestrial environment of the natural high hosting the settlement regarding humidity and vegetation types similarly to the pattern seen in the aquatic fauna, but was it really a climatic optimum for the first settlers in all aspects? Bearing the general location of the site in mind, the inferred conditions of the riparian environment could have emerged only in a period hallmarked by immense iterative floods in general. From this aspect, it would be crucial to know whether or not these conditions prevailed during the entire history of the pit. The picture gets even more interesting when we look at the composition of the fauna by blocks.
If we examine the general distribution of freshwater bivalves and snails along the studied profile, we can clearly see that the ratio of them is relatively even in this case as well. However, the soil blocks (F1S1 to F1S3) and the lowermost two blocks of the Körös pit (F2S1015 & F2S1116) are characterized by extremely low specimen numbers for all freshwater taxa in contrast to the other Körös pit blocks. This may imply that different subsistence strategies must have prevailed during the first phase of site evolution and the succeeding periods. In order to see whether the same pattern holds true for habitat conditions and as such may indicate interrelatedness with subsistence strategies, it was necessary to evaluate taxonomic composition of both mollusk fauna along the profile as well. As seen on Fig. 4, there is a relatively large scatter of samples along both axes of the DCA scatterplot marking the most important ecological gradients yielding the observed faunal composition of the freshwater fauna. Along Axis 1, rheophylic taxa are characterized by slightly positive eigenvalues close to zero (< 0.4). Conversely, elements with a preference for standing water or tolerating temporary moving water conditions are characterized by positive eigenvalues between 0.4 and 1.1. Thus, we may interpret this gradient as reflecting stream velocity on the floodplain. Conversely, there is a marked separation of freshwater gastropods dwelling in minor muddy ponds of the backswamp (eigenvalues ~ 2) from the rest of the taxa populating oxbow lakes and drainage channels of the floodplain in general (eigenvalues ~ 0) along Axis 2. Thus, this separation must be linked to differences in habitat types.
If we examine the distribution of the samples along the referred axes (Figs. 4 and 5), we can clearly see that the lowermost two blocks (F2S101 & F2s1116) are characterized by high positive eigenvalues (~ 1.6). Conversely, the uppermost two blocks of the Körös pit (F2S4 & F2S7) have eigenvalues around 0. The blocks in between are somewhat outliers. Block F2S914 directly overlying the lowermost two blocks seems to occupy an intermediate position between the contemporary block units (see Fig. 3 and chapter 2) with eigenvalues around 1. Conversely, the successive block of F2S813 has extremely low eigenvalues (~ − 1.4). A similar pattern develops along Axis 2 with one exception of block F2S4. This difference must be attributed however to the larger proportion of the two pond dwelling snails in this material compared with the other blocks. Apart from this, the lowermost two blocks here again are clearly separated from the overlying blocks. The former has eigenvalues of 0 and 0.8. Conversely, the latter is characterized by a uniform value ~ − 0.4 indicating common conditions regarding the inferred environmental gradient along Axis 2, so it seems that the period captured by the lowermost two blocks was characterized by relatively calm conditions on the floodplain, hydraulically speaking with a dominance of muddy substrate. However, later markedly different conditions develop characterized by strong current parameters as seen in the similar trend of proxies gained to depict conditions of the riparian environment (Fig. 5). On the basis of this information, the emergence of immense iterative floods inferred from the general composition of the freshwater fauna could have been corroborated. Nevertheless, the observed temporal differences are in line with those seen for quantity of the harvested fauna, so the inferred shift in the quality of the riparian environment is seen in the alteration of subsistence strategies as well, implying a greater reliance on aquatic resources.
Terrestrial elements are separated along Axis 1 in accordance with their humidity requirements (Fig. 4). Xerophylous elements have eigenvalues around 0. Conversely, hygrophilous elements have eigenvalues above 0.8, so Axis 1 must represent the humidity gradient. Along Axis 2, taxa are separated according to their habitat preferences. Grassland elements have eigenvalues close to 0. Forest steppe elements have eigenvalues above 0.5. Along Axis 1, the soil blocks are markedly separated from those of the Körös pit (Fig. 4). The former has negative, while the latter has positive eigenvalues, implying that relatively humid conditions must have prevailed during the life of the Körös culture in the area most likely attributable to the higher temperatures yielding higher evaporation. Along Axis 2, the lowermost three Körös blocks (F2S914 to F2S1116) have eigenvalues close to 0 similarly to the uppermost soil blocks (Fig. 4). The directly overlying Körös blocks however are characterized by positively shifted eigenvalues along Axis 1 marking a transformation in terrestrial habitats around the pit to a more closed stage (high grass), probably attributable to higher humidity values (Fig. 5). All in all, the observed transformation in the riparian environment triggered a similar adaptational feedback in the terrestrial vegetation as seen in the strong statistically significant correlation between the gained proxies of water velocity and humidity (Spearman rho = 0,833**Footnote 3). The pattern seen for the soil blocks is just the opposite of the Körös blocks implying a cessation of periods with higher humidity (Fig. 5).
Geochemical properties of the studied freshwater fauna
Concentrations of Mn2+ and Fe2+ in the shell ranged on the scale of some hundred ppms, while that of Zn2+ on the scale of tens. Samples are clearly separated from each other based on the average concentrations of all studied elements for both the rheophylic mussel and river snail taxa (Fig. 6). The pattern seen seems to be congruent with that observed for the taxonomic composition of the fauna, corroborating the assumption that compositional changes inferred are the outcome of the same transformations of the riparian environment despite the artificial nature of the deposit. The uppermost blocks of both the Körös pit and the soil (numbers 1–6 on Fig. 6) are unambiguously separated from the lowermost two blocks of the Körös pit (numbers 8 and 9) on all axes.
The highest concentration of manganese was recorded in the lowermost two blocks with values around 320–370 ppm for mussel shells and 90–100 ppm for gastropods. In general, the concentration of manganese is significantly lower in the overlying Körös pit blocks with a gradually decreasing trend. A similar pattern was observed for iron and zinc as well in case of both taxa with minor discrepancies as seen by the strong correlation value (Spearman rho = 0.686). It is interesting to note here that the recorded concentrations of all elements in the shells of the uppermost 4 Körös pit blocks were similar to those recorded for the modern taxon from River Tisza and European rivers and lakes (Bába et al. 2002; Ravera et al. 2003, 2007). On the basis of the concentration of manganese observed during the initial phase of site evolution corresponding to the lowermost two blocks, aquatic habitats were characterized by low dissolved oxygen levels most likely attributed to higher bioproduction rates. Higher bioproduction resulting in increased reduction of iron and manganese generally yields lower pH values (Richardson et al. 1988). A shift to lower values in all elements in the overlying blocks hallmarks an increase in dissolved oxygen of the waterbody and a shift in pH to higher values most likely as a result of decreased bioproduction. Furthermore, the general upward decrease in the concentration of all elements according to Lee and Wilson (1969) and Hill (1975) is a marker of larger discharge to the area (Fig. 5). These conditions can only develop in a floodplain setting as ours via more intensive floods carrying waters rich in oxygen and relatively deprived of dissolved elements.
A very similar pattern was observed for isotopes of mussel shells as well (Figs. 5 and 7). Samples of the lowermost block have higher values of δ13Cshell and δ18Oshell. Parallel with the observed decrease in the recorded trace elements, a negative excursion of both isotope values is observed in accordance with the literature (Caroll and Romanek 2008). Initially, this excursion is seen in δ18Oshell alone, while δ13Cshell remains relatively the same (F2S914). Finally, a major negative shift occurs in these values as well (F2S813). In a floodplain setting with standing waters, higher δ13C and δ18O values of shell carbonates may reflect drier conditions characterized by higher temperature values and more intense primary production (Caroll et al. 2006; Ellis et al. 2004; Peacock and Seltzer 2008). Higher temperatures enhance evaporation yielding positive δ18OTDIC water and δ18OTDIC shell valuesFootnote 4 (Bowen 1991; Kennett and Voorhies 1995; Tripati et al. 2001; Davies and Muehlenbachs 2001; Dettman et al. 1999; Versteegh 2008). Aquatic plants and phytoplanktons tend to use the lighter isotope of carbon (12C) in their metabolism due to energy reasons. This yields an increase in the δ13CTDIC water value (Hollander and Smith 2001; Leng and Marshall 2004). In the Swiss Lake Greifen, δ13CTDIC values of near surface waters recorded during phytoplankton blooms were around − 7.5‰ (McKenzie 1985; McKenzie and Hollander 1993), which is roughly the same as the average values of δ13C shell in samples of the lowermost block (F2S116) and that of the successive block F2S914.
This may indicate a similarity in environmental conditions, i.e., higher primary production rates. The initial negative shift of δ18Oshell may refer to the development of a cooler climate enjoying more precipitation (Caroll et al. 2006; Gustafson et al. 2007; Dettman et al. 1999). Mean July paleotemperatures received via the analysis of the terrestrial mollusk fauna however speak about a climate with warm conditions near our study site (~ 22 °C) (Sümegi 2003a, 2003b, 2004, 2007), so rather this shift may indicate infiltration of waters into the study area with altered isotopic composition due to immense rainfall onto the watershed area of the Tisza River. Similar negative isotopic shifts were recorded in the lower reaches of the Rhein in relation to spring meltdown in the Alps (Ricken et al. 2003). The delayed negative excursion of δ13Cshell values with unchanged δ18Oshell values in case of the block F2S813 must be attributed to a delayed response in bioproduction rates to altered dissolved oxygen levels yielding a transformation of the trophic state as well (Leng and Marshall 2004). It is interesting to note though that δ13C(TDIC) values recorded for groundwater and fluvial systems of Northern and Western Europe (bw.− 10 and − 15‰), which are also under the influence of the same cyclonic system carrying precipitation to our study area as well, are very similar to the ones recorded in our uppermost studied Körös block of F2S813 (Leng and Marshall 2004; Andrews et al. 1993, 1997).
To sum up the observed trajectory of geochemical transformations recorded in our shells are congruent with those inferred for the riparian environment via the analysis of taxonomic composition of the freshwater fauna. For the period corresponding to the lowermost blocks, an aquatic habitat of low dissolved oxygen levels, lower stable pH values, and higher bioproduction rates could be postulated. These were exchanged by conditions of high dissolved oxygen levels of the water, higher pH values, and lower bioproduction rates as well as negatively shifted δ18O values indicating the transport of waters of different isotopic composition to the floodplain, i.e., a clear outcome of more pronounced floods.
Foraging and subsistence strategies inferred
There is little information available on the importance of crop cultivation. Appearance of cereal phytoliths in the upper blocks of Feature 2 is the only data we have (Sümegi et al. 2012) but information on temporal changes of the importance of crop cultivation is not available. Detailed archeozoological studies highlighted the importance of second-line resources in subsistence besides domesticates (Bartosiewicz 2005, 2006, 2007; Pike-Tay et al. 2004; Raczky 2012; Raczky et al. 2010). It must be noted that the data presented is a sum of the entire feature hampering the elucidation of any temporal patterning. Nevertheless, the general composition of the vertebrate fauna of the archeozoological material speaks about a subdominance of the wild component (14.4%) (Fig. 8) compared with domesticates (85.6%) prevailed by caprines (66.7%). It is interesting to note that ca. two-thirds of the wild component is given by freshwater vertebrates (Fig. 8). Within this component, wildfowl is the dominant along with freshwater fish. The versatility of the ifreshwater fish taxa and other aquatic vertebrates clearly speaks about a larger reliance on freshwater habitats for food by the Körös farmers in line with the expected resilience models.
Our shellfish material enabled us to tackle temporal changes in the use of freshwater resources as well. Exploitation of freshwater resources (river mussels and river snails) was generally low in the lowermost two Körös pit blocks (F2S1015 & F2S1116) implying a negligible use of second-line resources during this period most likely as a result of abundance of other subsistence resources (Figs.5 and 8). Similarly, low harvest intensity values characterized the soil blocks. Peak exploitation of several hundred specimens was recorded for the contemporary Körös blocks (F2S813-F2S914) directly overlying the two lowermost blocks. The intensive use of second-line resources here is congruent with the inferred transformation of the nearby riparian environment due to the emergence of immense floods as seen in the strong correlation of our stream velocity proxy and harvest intensity values (Spearman rho = − 0.680*Footnote 5p = 0.05), which is a clear sign of social and economic stress in site development (Jones 2004). The reason for the negative correlation is that the negative shift in DCA1 values expressing an increase in stream velocity was followed by an increase in harvest intensity.
Discussion
The Körös site Nagykörü-Orchard is outstanding from the point of understanding the potential background causes of a major cultural transformation which occurred in the heart of the Carpathian Basin along the northern distribution line of first farming groups during the middle of the 6th millennium BC. It is the only site so far where subsistence strategies of the first farming groups arriving in the Carpathian Basin could have been studied in details at a longer temporal scale from their first settlement to about the stage of their cultural transformation. Collective evaluation of findings from this site and a comparison with other nearby contemporary sites of Tiszapüspöki-Karancspart-Háromága (Sümegi 2003b, 2004; Gulyás and Sümegi 2004, 2012a) and Ecsegfalva 23 (Whittle 2007)Footnote 6 located along the referred borderline as well enables us to capture and model the characteristics of aquatic and terrestrial habitats of the alluvial plain well before and right around this transformation event on a regional scale. It must be noted though that the other two contemporary sites of Tiszapüspöki-Karancspart-Háromága and Ecsegfalva 23 provide only a general view of the hydrological and environmental conditions at the time of their existence without insight into any smaller-scale temporal trend.
Based on our findings, the first phase of site evolution corresponding to the opening of the 6th millennium BC was characterized by relatively calm and balanced conditions on the floodplain hydraulically speaking (Fig. 9a). However, a pronounced transformation was documented in both the freshwater and terrestrial habitats in the period corresponding to the uppermost blocks of the site of Nagykörü (~ 5750–5700 cal BC). This period is directly preceding the time of cultural transformation dated around 5620 cal BC (Fig. 3) (Domboróczki 2010). Furthermore, it is also contemporary with a well-documented nearby site of Ecsegfalva 23 as well (5750–5650 cal BC) (Fig. 3) (Whittle 2007; Sümegi 2007; Gulyás et al. 2007).
The initial still-water conditions characterized by lower dissolved oxygen levels of the waterbody and an elevated primary production on the floodplain (Fig. 9a) were exchanged for stream water conditions (Fig. 9b). This was accompanied by a significant increase in the water’s dissolved oxygen content and a shift in pH marking the influences of heightened flood activities. These changes also brought about a sudden drop in the rate of primary production within the isolated pools of the floodplain. The inferred transformations on the floodplain were equally observable in the adjacent elevated terrestrial areas as well. As a result of the more pronounced floods, the majority of the generally dry near-bank and wet meadow areas must have been inundated and remained under higher water for the major part of the year. Furthermore, the relatively constant inundation must have significantly raised the level of subsurface water table yielding so-called inland water outburst in the vicinity of the test pit and the major part of the flood-free lag surface of Nagykörü (Fig. 9b).
These changes must have further reduced the areas potentially available for grazing or plant cultivation. The strong negative excursion in the δ18O of freshwater shells (Figs. 5 and 7) indicates a continuous supply of freshwater of different isotopic composition onto the floodplain, marking the development of long-lasting pronounced iterative flood cycles for the referred transformation period. Higher temperatures of the growth season must have favored elevated evapotranspiration seen in higher humidity values.
Findings of a similar study for the site of Ecsegfalva 23 (Fig. 2), corresponding to the transformational phase of the culture’s evolution, also point to the prevalence of moving-water conditions on the floodplain during the referred period seen in the taxonomic composition of shellfish foraged (Gulyás et al. 2007) and the geochemistry of freshwater shells, yielding relatively high dissolved oxygen levels of the waterbody and slightly fluctuating pH values (Gulyás 2011). All these factors point to the effects of immense, iterative floods for the period of the settlement resulting in the reduction of potentially available landscape resources of horticulture, and animal husbandry in concert with other paleoecological results from the site. The relatively high abundance of ash pollen grains, a species tolerating constant inundation, from about 6000 cal BC onwards in the profile of the meander of the adjacent Kiri-tó, is another independent marker of pronounced floods to the area between 5750 and 5650 cal BC years (Willis 2007). The dominance of aquatic plants in both the macrobotanical and pollen material also indicates constant inundation in the vicinity of the site of Ecsegfalva (Willis 2007). Phytolith analysis of soil samples from the site also corroborated the vision of an inundated floodplain with higher water levels. The material was dominated by aquatic plants. Conversely, reed intolerant of high water levels is completely missing (Windland 2007). Detailed isotopic analysis of human and animal bones with relatively high N and low C values further corroborates this paleogeographic reconstruction (Pearson and Hedges 2007). The observed shift in the isotopic values was attributed to arthritic stress caused by floodwaters on the one hand, or the side-effects of grazing on inundated, artificially manured arable lands (Sebilo et al. 2003; Pearson and Hedges 2007). High N values in human bones on the other hand may refer to intensified reliance on aquatic food sources just like in the case of the site of Lepenski Vir (Cook et al. 2001; Bonsall et al. 2004). All in all, we may infer the development of iterative, high level, pronounced floods for the period corresponding to the cultural transformation of first farming groups in this site as well similarly to our study site of Nagykörü. A common local response to this environmental stress was the development of flexible opportunistic agricultural regimes observable in our study site of Nagykörü as well (Raczky et al. 2010). This included an increased reliance on multiple resources like freshwater fish, wildfowl (Bartosiewicz 2007; Gál 2007; Bartosiewicz and Gál 2007; Raczky et al. 2010), and shellfish (Gulyás et al. 2007) on the one hand (Fig. 8). Plus, there was the introduction of small-plot horticultural production on the other hand (Sümegi 2004; Sümegi et al. 2005; Whittle 2007).
The other nearby site of Tiszapüspöki, with only archeostratigraphy-based absolute chronology (Fig. 2), was also characterized by prevailingly still-water floodplain conditions with intermittent periods of stream conditions also seen from archeomalacological data (Sümegi 2004; Gulyás and Sümegi 2004). Knowing the geographical and geomorphological endowments of the site located at a larger distance from the active channel of the river Tisza on the floodplain, these could have developed during periods of higher floods alone. The inferred pH conditions and dissolved oxygen content of the studied waterbody shown from geochemistry of freshwater shells seem to have corroborated this assumption, yielding value characteristic of fluvial systems (Gulyás 2011). Reduced growth rate of the dominant still-water shellfish also refers to the presence of some constant environmental stress, probably attributable to increased current conditions in the drainage channel of the floodplain, hosting the original fauna (Gulyás and Sümegi 2004). Although the site of the settlement remained flood-free as shown by the findings of detailed geoarcheologial investigations, the general distribution of marshy loess and overlying hydromorphic soils also indicate high, but somewhat lower inundation of the floodplain compared to the other two sites (Sümegi 2004). This must be attributed to the more distant (~ 7–8 km) and protected position of the site on the floodplain regarding from the active riverbed of the Tisza, yet the constancy of these moderated flood events is clearly expressed in the mentioned growth parameters and geochemistry of the harvested freshwater shellfish fauna.
Based on our findings presented above, the development of a mental crisis in the representatives of the Körös groups along their northern marginal distribution in the Carpathian Basin postulated by Raczky et al. (2010) cannot be attributed to the hostility of a new, unknown environment forcing new adaptations alone, but rather as our data shows, these factors must have been complemented and further amplified by a major climatic anomaly connected to IRD event 5b initiating around 5.7 ky BC (Spurk et al. 2002; Strien and Gronenborn 2005; Benito et al. 2015) (Fig. 10). This event is recorded in an increased southward transport of ice-rafted debris in the Northern Atlantic marking the southward extension of cooler ocean waters. An intensive cyclonic activity and cooler temperatures over Western Europe generally connected to IRD (Ice Rafted Debris) peaks (Bond et al. 1997, 2001) in the Atlantic region led to higher flood activities in temperate Europe and the Mediterranean as well (Benito et al. 2015). In Hungary, higher continentality provided by the basin setting preserved warmer conditions. Nevertheless, increased rainfall onto the watershed of major rivers including the Tisza River crossing the GHP triggered heightened floods.
Signs of intensified flooding were noted recently in NW Hungary for this period as well (Törőcsik et al. 2019). Higher and more pronounced floods must have emerged in the watershed of the Tisza River. These hydrological changes isolated neighboring Körös culture groups and reduced the areas of pasturelands and potentially available agricultural plots, social space on the floodplain. Negative effects must have been more pronounced closer to the active river channel (Nagykörü), but somewhat moderated in the more distant floodplain areas (Ecsegfalva, Tiszapüspöki). These conditions must have been utterly unfavorable to a rather conservative Mediterranean type of economy based on goat and sheep like the Körös culture creating a real crisis situation. The immense appearance of these negative events must have triggered a rapid adaptational process first seen in the wider use of second-line resources, mainly freshwater ones. Then, finally leading to the transformation of subsistence and settlement strategies seen in the displacement of settlements to higher areas (Sümegi 2003b), as well as the material culture (Raczky 1983; Raczky et al. 2010; Bánffy 2004a, 2004b, 2006; Oross and Bánnfy 2009; Domboróczki 2010; Raczky 2012).
Concluding remarks
Historical communities often choose floodplain areas for settlement despite the risk of seasonal flooding because of numerous advantages, as these complex habitats with a diverse natural flora and fauna as well as soils provide multiple sources of subsistence and permanent water supply (Gardner 2005; Gillings 2007; Raczky et al. 2010). The unknown distribution of resources, variable flooding intensities due to climate changes pose significant challenges to communities to which they are forced to adapt. The success of adaptation is dependent on the resilience of the given group. Körös Culture pastoralists responded to these challenges by complementing their diet with opportunistically exploited wild resources, dominantly freshwater ones (Bartosiewicz 2005, 2006, 2007; Pike-Tay et al. 2004; Raczky 2012; Raczky et al. 2010, this study). Archeomalacological investigations presented here is a useful and suitable tool for capturing temporal changes in flood intensities and tackling subsistence changes through time enabling us to understand reasons behind subsistence and cultural changes (Gulyás 2011; Gulyás and Sümegi 2011a, 2011b, 2012a, 2012b). Based on our new results and a regional comparison with other coeval paleohydrological, paleoecological, and archeological records, climate-induced dynamic temporal changes in the hydrology of the originally hostile environment must have been a more important push factor in adaptation of the first farmers than simply the static new natural endowments which were less suitable for engagement of a Mediterranean type agriculture. Similar climate-induced hydrological changes and adaptations by farming communities have been documented for Late Neolithic cultures of the GHP as well (Gulyás 2011; Gulyás and Sümegi 2011a, 2011b, 2012a, 2012b). Extension of our work and methodology in the future to other areas of the Carpathian Basin such as Körös and Starcevo sites found in Transdanubia and along the Danube River can help us to see if these dynamic changes also affected the landscape, hydrology, and the social and economic lives of the mentioned early farming groups.
Notes
AVK and DVK are contemporary cultural groups of regional variants of the Middle Neolithic Linear Pottery Culture, DVK (Transdanubian Linear Pottery Culture) is restricted to Western Hungary and known to spread the Neolithic package to the rest of Western Europe, and AVK (Alföld Linear Pottery Culture) occupied the NE part of the Great Hungarian Plain (Kutzián 1944; Kalicz 1970; Raczky 1978; Raczky 1983; Raczky et al. 2010; Bánffy 2000; Bánffy 2004a; Bánffy 2004b, 2006; Whittle et al. 2002; Whittle 2007; Oross and Bánnfy 2009; Bánffy and Oross 2010).
** statistically significant correlation (p = 0.01)
TDIC, total dissolved inorganic carbon
*statistically significant correlation at p = 0.05.
for location of these see Fig.1.
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Acknowledgments
The authors would like to express their gratitude to all colleagues working at the Department of Geology and Paleontology, University of Szeged for assisting in the technical part of paper preparation. Special thanks to Pál Raczky and Alexandra Anders at the ELTE Univeristy of Budapest for granting access to the material subjected to analysis as well as the archeostratigraphy. Research has been carried out within the framework of University of Szeged, Interdisciplinary Excellence Centre, Institute of Geography and Earth Sciences, Long Environmental Changes Research Team. Finally, thanks are due to the editorial board and the two reviewers whose comments made the final version of this paper stronger and clearer than early drafts.
Funding
Open access funding provided by University of Szeged. This study is funded by the Ministry of Human Capacities, Hungary grant 20391-3/2018/FEKUSTRAT and GINOP-2.3.2-15-2016-00009 “ICER.”
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Gulyás, S., Nagy, B., Sümegi, P. et al. Intensified mid-Holocene floods recorded by archeomalacological data and resilience of first farming groups of the Carpathian Basin. Archaeol Anthropol Sci 12, 170 (2020). https://doi.org/10.1007/s12520-020-01120-3
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DOI: https://doi.org/10.1007/s12520-020-01120-3