1 GARP Genetic Algorithm for Rule-Set Prediction: machine-learning algorithm that creates ecological niche models for a species (Chen and Peterson 2000; Peterson 2001; Stockwell 1999). ecological niche of a species, defined as the range of environmental conditions within which it can persist without immigrational subsidy predicts species range expansion or contraction in response to real or simulated climatic changes Desktop GARP
2 the geographic coordinates of radiometrically dated and culturally attributed archaeological sites GARP Input Data 6200 C 14 ages for 1112 sites Type of date and dated material Arch. level and cultural attribution Geographic coordinates Faunal Data for over 2000 archaeological components from ca. 500 sites - AMS - Conventional d Errico and Sanchez Goni 2003 QSR d Errico et al. in Bard 2006
3 Raster GIS data layers GARP Input Data Landscape attributes slope aspect elevation drainage Index Drainage Index Banks, d Errico et al JAS
4 Raster GIS data layers GARP input data High- Resolution Climate Simulations : by forcing a GCMs following the PMIP 1 protocol Sst temperatures Sea ice cover Ice-sheets volume CO2 concentration insolation LGM Cold Month Temp. output: Temperature Mean Annual Coldest Month Warmest Month Precipitation grid box size over Europe of ~ 60 km LGM Warm Month Temp. LGM Mean Annuel Precip.
5 GARP Modeling Process
6 olutrean Epigravettian
7 Application of GARP to the LGM determine the limits of the potential human range during the LGM (22 20 ka cal BP) define the eco-cultural niches of the two main archeological cultures present in Europe at that time (the Solutrean and Epigravettian technocomplexes) identify environmental and cultural factors that shaped their geographic ranges Banks, d Errico et al JAS
8 Results (Solutrean + Gravettian) Banks, d Errico et al JAS
9 LGM Cold Month Temp. CA = 85% variability irst two components (temperatures) Banks, d Errico et al JAS
10 LGM Cold Month Temp. CA = 85% variability irst two components (temperatures) Banks, d Errico et al JAS
11 LGM Modeling Results continous deep permafrost continous permafrost discontinous permafrost Limit of different permafrost types during the LGM Van Vliet-Lanoe 1996
12 LGM RESULTS (cont.) Solutrean Epigravettian Little overlapping Adaptation to different Banks, d Errico et al JAS
13 Solutrean corresponds to known archaeological distribution Banks, d Errico et al JAS Solutrean Epigravettian is broader than its archaeological distribution Epigravettian
14 Banks, d Errico et al JAS Solutrean Epigravettian Competition?
15 Banks, d Errico et al JAS Ecological risk Solutrean Epigravettian Competition?
16 Nettle (1998), Mace & Pagel (1995) Linguistic diversity is linearly correlated with the ecological risk Nettle (1998)
17 Banks, d Errico et al JAS Ecological risk Solutrean Epigravettian Competition?
18 Banks, d Errico et al JAS Solutrean Ecological risk Geographic barriers Epigravettian Competition?
19 Banks, d Errico et al JAS Solutrean Ecological risk Geographic barriers Epigravettian Competition?
20 Banks, d Errico et al JAS Conclusions GARP consistently outline the northern boundary of human presence at 22,000 20,000 cal BP This boundary is mainly determined by climatic constraints and corresponds well to known southern limits of periglacial environments and permafrost conditions during the LGM Solutrean and Ancient Epigravettian are adapted to two different ecological regimes Differences between predicted ecological niches and known ranges of the Solutrean and Epigravettian are interpreted as reflecting influences of ecological risk on geographic distributions of cultures
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