Niche partitioning between two sympatric genetically distinct cave bears (Ursus spelaeus and Ursus ingressus) and brown bear (Ursus arctos) from Austria: Isotopic evidence from fossil bones

TY - JOUR

T1 - Niche partitioning between two sympatric genetically distinct cave bears (Ursus spelaeus and Ursus ingressus) and brown bear (Ursus arctos) from Austria: Isotopic evidence from fossil bones

AU - Bocherens, Herve

AU - Stiller, Mathias

AU - Hobson, Keith A.

AU - Pacher, Martina

AU - Rabeder, Gernot

AU - Burns, James A.

AU - Tuetken, Thomas

AU - Hofreiter, Michael

PY - 2011/12/6

Y1 - 2011/12/6

N2 - In the Austrian caves of Gamssulzen and Ramesch, two genetically distinct cave bears, Ursus ingressus and Ursus spelaeus eremus, apparently lived side by side for 15,000 years, together with brown bears Ursus arctos. The possible ecological partitioning of these three types of bears was investigated using multi-isotopic tracking of organic (delta C-13(coll), delta N-15(coll)) and inorganic (delta C-13(carb), delta O-18(carb), delta O-18(PO4)) fractions of bone. The cave bears from Ramesch, Ursus spelaeus eremus, were ecologically distinct from the cave bears from Gamssulzen, Ursus ingressus, both being ecologically distinct from brown bears from Ramesch, Ursus arctos. Both cave bear types were purely herbivorous but likely consumed different plant types and/or plants from different habitats, while brown bears included some animal proteins in their diet. Bone apatite delta O-18 values strongly suggest that both types of cave bears used isotopically distinct water sources, indicating that they may not have occupied the same landscape, either separated in space or in time due to climatic shifts. Therefore, the influence of environmental conditions strongly constrained the genetic structure of these bears. (C) 2010 Elsevier Ltd and INQUA. All rights reserved.

AB - In the Austrian caves of Gamssulzen and Ramesch, two genetically distinct cave bears, Ursus ingressus and Ursus spelaeus eremus, apparently lived side by side for 15,000 years, together with brown bears Ursus arctos. The possible ecological partitioning of these three types of bears was investigated using multi-isotopic tracking of organic (delta C-13(coll), delta N-15(coll)) and inorganic (delta C-13(carb), delta O-18(carb), delta O-18(PO4)) fractions of bone. The cave bears from Ramesch, Ursus spelaeus eremus, were ecologically distinct from the cave bears from Gamssulzen, Ursus ingressus, both being ecologically distinct from brown bears from Ramesch, Ursus arctos. Both cave bear types were purely herbivorous but likely consumed different plant types and/or plants from different habitats, while brown bears included some animal proteins in their diet. Bone apatite delta O-18 values strongly suggest that both types of cave bears used isotopically distinct water sources, indicating that they may not have occupied the same landscape, either separated in space or in time due to climatic shifts. Therefore, the influence of environmental conditions strongly constrained the genetic structure of these bears. (C) 2010 Elsevier Ltd and INQUA. All rights reserved.

UR - http://www.scopus.com/inward/record.url?scp=80052769109&partnerID=8YFLogxK

U2 - 10.1016/j.quaint.2010.12.020

DO - 10.1016/j.quaint.2010.12.020

M3 - Article

SN - 1040-6182

VL - 245

SP - 238

EP - 248

JO - Quaternary International

JF - Quaternary International

IS - 2

ER -