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100			_aPadgett, Abigail _951941
245			_aHolocene cultural and climate shifts in NW Africa as inferred from stable isotopes of archeological land snail shells /
260			_bSage, _c2019.
300			_aVol 29, issue: 6, 2019 : (1078-1093 p.).
520			_aCultural transitions or even societal collapses have often been associated with long-term drought events. Linkages between humans and the environment are best documented in well-constrained archeological records that offer multi-centennial to multi-millennial cultural and paleoclimate data. Two Holocene Capsian sites, Kef Zoura D and Aïn Misteheyia, from NE Algeria document a marked change in subsistence strategies near 8200 cal. yr BP. Radiocarbon dated archeological shells (from 10,300 to 6700 cal. yr BP) of the terrestrial gastropod Helix melanostoma were studied to examine the role of climate change on cultural shifts. Oxygen (δ18O) and carbon (δ13C) stable isotopes were measured from whole shells and time-series profiles along shell ontogeny to assess average annual paleoclimate and degree of seasonality, respectively. Shell δ18O values illustrate that conditions were wetter between 10,300 and 9000 cal. yr BP, coinciding with the ‘African Humid Period’, whereas the environment turned drier at 8000–7600 cal. yr BP, immediately after the 8.2-ka climate event, feasibly comparable in magnitude to the drought episode initiated in 1968 in the Sahel and N Africa. A snail evaporative steady-state flux balance-mixing model suggests that snails at around 8000 years ago precipitated shells under notably lower relative humidity conditions than previous wetter scenarios of the earlier Holocene. The well-known 8.2 ka cold event of the Northern Hemisphere was detected as a drought event that seems to have lasted several centuries in Algeria. The δ13C values indicate that snails only consumed and assimilated C3 plants without noticeable shifts. This study points to multi-millennial humidity fluctuations in NE Algeria, which likely affected the economy and subsistence strategies of prehistoric human groups in the area.
650			_a8.2 ka event, _951942
650			_a Algeria, _951943
650			_aCapsian, _951944
650			_apaleoclimate, _951378
650			_astable isotopes, _951610
650			_aterrestrial gastropods _951945
700			_aYanes, Yurena _951946
700			_a Lubell, David _951947
700			_aFaber, Meredith L _951948
773	0		_012756 _916504 _dLondon: Sage Publication Ltd, 2019. _tHolocene/ _x09596836
856			_uhttps://doi.org/10.1177/0959683619831424
942			_2ddc _cART
999			_c12831 _d12831