Stable isotope and DNA analyses reveal the spatial distribution of crop-foraging brown bears

2017 ◽  
Vol 303 (3) ◽  
pp. 207-217
Author(s):  
A. Hata ◽  
M. B. Takada ◽  
R. Nakashita ◽  
K. Fukasawa ◽  
T. Oshida ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Stable Isotope ◽  
Brown Bears ◽  
Dna Analyses ◽  
Crop Foraging

scholarly journals Slaves as burial gifts in Viking Age Norway? Evidence from stable isotope and ancient DNA analyses

2014 ◽  
Vol 41 ◽  
pp. 533-540 ◽  
Author(s):  
Elise Naumann ◽  
Maja Krzewińska ◽  
Anders Götherström ◽  
Gunilla Eriksson
Keyword(s):  
Stable Isotope ◽  
Ancient Dna ◽  
Viking Age ◽  
Dna Analyses

The Trophic Position of Pleistocene and Modern Brown Bears (Ursus arctos) of Yakutia Based on Stable Isotope Analyses

2020 ◽  
Vol 47 (8) ◽  
pp. 1013-1021
Author(s):  
O. A. Krylovich ◽  
G. G. Boeskorov ◽  
M. V. Shchelchkova ◽  
A. B. Savinetsky
Keyword(s):  
Stable Isotope ◽  
Ursus Arctos ◽  
Trophic Position ◽  
Brown Bears ◽  
Stable Isotope Analyses ◽  
Isotope Analyses

scholarly journals Stable isotopes reveal variation in consumption of Pacific salmon by brown bears, despite ready access in small streams

2020 ◽  
Author(s):  
HyeJoo Ro ◽  
Jennifer H. Stern ◽  
Aaron J. Wirsing ◽  
Thomas P. Quinn
Keyword(s):  
Stable Isotope ◽  
Sockeye Salmon ◽  
Ursus Arctos ◽  
Pacific Salmon ◽  
Brown Bears ◽  
Small Streams ◽  
Hair Samples ◽  
Wide Range ◽  
Stable Isotope Signatures ◽  
Ready Access

Brown bears Ursus arctos consume a wide range of organisms, including ungulates and plants, but Pacific salmon Oncorhynchus spp. are especially important to their diet where their ranges overlap. Although some bears minimize antagonistic encounters with other bears or infanticide by avoiding streams where salmon spawn, studies generally assume that bears with ready access to salmon feed heavily on them. To test this assumption, and the hypothesis that male bears would feed more heavily on salmon than females (owing to their sexual size dimorphism), we collected hair samples from brown bears using barbed wire on six small tributaries of Lake Aleknagik, Alaska where adult sockeye salmon O. nerka are readily accessible and frequently consumed by bears. Analysis of DNA distinguished among the different bears leaving the hair samples, some of which were sampled multiple times within and among years. We assessed the contribution of salmon to the diet of individual bears using carbon and nitrogen stable isotope signatures. The 77 samples analyzed, from 31 different bears over four years, showed isotopic ratios consistent with reliance on salmon, but the wide range of isotopic signatures included values suggesting variable, and in one case considerable, use of terrestrial resources. Stable isotope signatures did not differ between male and female bears, nor did they differ between two sides of the lake, despite marked differences in sockeye salmon density. The hair samples were collected when salmon were present, so there was some uncertainty regarding whether they reflected feeding during the current or previous season. Notwithstanding this caveat, the results are consistent with the hypothesis that salmon were sufficiently available to provide food for the bears, and that the considerable isotopic variation among bears with access to salmon reflected their age, status, and behavior.

Tracing spatial distribution of parasitism in fields with flowering plant strips using stable isotope marking

2006 ◽  
Vol 39 (2) ◽  
pp. 240-247 ◽  
Author(s):  
Heike Wanner ◽  
Hainan Gu ◽  
Detlef Günther ◽  
Silke Hein ◽  
Silvia Dorn
Keyword(s):  
Spatial Distribution ◽  
Stable Isotope ◽  
Flowering Plant

Spatial distribution of stable isotope values of human hair

2020 ◽  
pp. 385-410
Author(s):  
Luciano O. Valenzuela ◽  
Lesley A. Chesson ◽  
Gabriel Bowen ◽  
Thure E. Cerling ◽  
James R. Ehleringer
Keyword(s):  
Spatial Distribution ◽  
Stable Isotope ◽  
Human Hair

Levels, spatial distribution, risk assessment, and sources of environmental contamination vectored by road dust in Cienfuegos (Cuba) revealed by chemical and C and N stable isotope compositions

2019 ◽  
Vol 27 (2) ◽  
pp. 2184-2196 ◽  
Author(s):  
Yasser Morera-Gómez ◽  
Carlos Manuel Alonso-Hernández ◽  
Jesús Miguel Santamaría ◽  
David Elustondo ◽  
Esther Lasheras ◽  
...  
Keyword(s):  
Risk Assessment ◽  
Spatial Distribution ◽  
Stable Isotope ◽  
Environmental Contamination ◽  
Road Dust ◽  
C And N
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