Intrapopulation Diversity in Isotopic Niche Over Landscapes: Spatial Patterns Inform Conservation of Bear–Salmon Systems
Intrapopulation variability in resource acquisition (i.e., niche variation) influences population dynamics, with important implications for conservation planning. Spatial analyses of niche variation within and among populations can provide relevant information about ecological associations and their...
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ftinstsciencepol:oai:www.wellbeingintlstudiesrepository.org:popdhab-1000 2023-06-18T03:43:24+02:00 Intrapopulation Diversity in Isotopic Niche Over Landscapes: Spatial Patterns Inform Conservation of Bear–Salmon Systems Adams, Megan S. Service, Christina N. Bateman, Andrew Bourbonnais, Mathieu Artelle, Kyle A. Nelson, Trisalyn Paquet, Paul C. Levi, Taal Darimont, Chris T. 2017-06-01T07:00:00Z application/pdf https://www.wellbeingintlstudiesrepository.org/popdhab/1 https://www.wellbeingintlstudiesrepository.org/context/popdhab/article/1000/viewcontent/Adams_et_al_2017_Ecosphere.pdf unknown WBI Studies Repository https://www.wellbeingintlstudiesrepository.org/popdhab/1 https://www.wellbeingintlstudiesrepository.org/context/popdhab/article/1000/viewcontent/Adams_et_al_2017_Ecosphere.pdf Population Distribution and Habitat Collection bears dietary niche geographic information systems isoscapes kernel-weighted regression Oncorhynchus predator–prey systems salmon stable isotope analysis Ursus Animal Studies Environmental Studies Population Biology text 2017 ftinstsciencepol 2023-06-04T20:20:03Z Intrapopulation variability in resource acquisition (i.e., niche variation) influences population dynamics, with important implications for conservation planning. Spatial analyses of niche variation within and among populations can provide relevant information about ecological associations and their subsequent management. We used stable isotope analysis and kernel-weighted regression to examine spatial patterns in a keystone consumer–resource interaction: salmon (Oncorhynchus spp.) consumption by grizzly and black bears (Ursus arctos horribilis, n = 886; and Ursus americanus, n = 557) from 1995 to 2014 in British Columbia (BC), Canada. In a region on the central coast of BC (22,000 km2 ), grizzly bears consumed far more salmon than black bears (median proportion of salmon in assimilated diet of 0.62 and 0.06, respectively). Males of both species consumed more salmon than females (median proportions of 0.63 and 0.57 for grizzly bears and 0.06 and 0.03 for black bears, respectively). Black bears showed considerably more spatial variation in salmon consumption than grizzlies. Protected areas on the coast captured no more habitat for bears with high-salmon diets (i.e., proportions >0.5 of total diet) than did unprotected areas. In a continental region (~692,000 km2 ), which included the entire contemporary range of grizzlies in BC, males had higher salmon diets than females (median proportions of 0.41 and 0.04, respectively). High-salmon diets were concentrated in coastal areas for female grizzly bears, whereas males with high-salmon diets in interior areas were restricted to areas near major salmon watersheds. To safeguard this predator–prey association that spans coastal and interior regions, conservation planners and practitioners can consider managing across ecological and jurisdictional boundaries. More broadly, our approach highlights the importance of visualizing spatial patterns of dietary niche variation within populations to characterize ecological associations and inform management. Text Ursus arctos The Humane Society of the United States, Institute for Science and Policy: Animal Studies Repository British Columbia ENVELOPE(-125.003,-125.003,54.000,54.000) Canada |
institution |
Open Polar |
collection |
The Humane Society of the United States, Institute for Science and Policy: Animal Studies Repository |
op_collection_id |
ftinstsciencepol |
language |
unknown |
topic |
bears dietary niche geographic information systems isoscapes kernel-weighted regression Oncorhynchus predator–prey systems salmon stable isotope analysis Ursus Animal Studies Environmental Studies Population Biology |
spellingShingle |
bears dietary niche geographic information systems isoscapes kernel-weighted regression Oncorhynchus predator–prey systems salmon stable isotope analysis Ursus Animal Studies Environmental Studies Population Biology Adams, Megan S. Service, Christina N. Bateman, Andrew Bourbonnais, Mathieu Artelle, Kyle A. Nelson, Trisalyn Paquet, Paul C. Levi, Taal Darimont, Chris T. Intrapopulation Diversity in Isotopic Niche Over Landscapes: Spatial Patterns Inform Conservation of Bear–Salmon Systems |
topic_facet |
bears dietary niche geographic information systems isoscapes kernel-weighted regression Oncorhynchus predator–prey systems salmon stable isotope analysis Ursus Animal Studies Environmental Studies Population Biology |
description |
Intrapopulation variability in resource acquisition (i.e., niche variation) influences population dynamics, with important implications for conservation planning. Spatial analyses of niche variation within and among populations can provide relevant information about ecological associations and their subsequent management. We used stable isotope analysis and kernel-weighted regression to examine spatial patterns in a keystone consumer–resource interaction: salmon (Oncorhynchus spp.) consumption by grizzly and black bears (Ursus arctos horribilis, n = 886; and Ursus americanus, n = 557) from 1995 to 2014 in British Columbia (BC), Canada. In a region on the central coast of BC (22,000 km2 ), grizzly bears consumed far more salmon than black bears (median proportion of salmon in assimilated diet of 0.62 and 0.06, respectively). Males of both species consumed more salmon than females (median proportions of 0.63 and 0.57 for grizzly bears and 0.06 and 0.03 for black bears, respectively). Black bears showed considerably more spatial variation in salmon consumption than grizzlies. Protected areas on the coast captured no more habitat for bears with high-salmon diets (i.e., proportions >0.5 of total diet) than did unprotected areas. In a continental region (~692,000 km2 ), which included the entire contemporary range of grizzlies in BC, males had higher salmon diets than females (median proportions of 0.41 and 0.04, respectively). High-salmon diets were concentrated in coastal areas for female grizzly bears, whereas males with high-salmon diets in interior areas were restricted to areas near major salmon watersheds. To safeguard this predator–prey association that spans coastal and interior regions, conservation planners and practitioners can consider managing across ecological and jurisdictional boundaries. More broadly, our approach highlights the importance of visualizing spatial patterns of dietary niche variation within populations to characterize ecological associations and inform management. |
format |
Text |
author |
Adams, Megan S. Service, Christina N. Bateman, Andrew Bourbonnais, Mathieu Artelle, Kyle A. Nelson, Trisalyn Paquet, Paul C. Levi, Taal Darimont, Chris T. |
author_facet |
Adams, Megan S. Service, Christina N. Bateman, Andrew Bourbonnais, Mathieu Artelle, Kyle A. Nelson, Trisalyn Paquet, Paul C. Levi, Taal Darimont, Chris T. |
author_sort |
Adams, Megan S. |
title |
Intrapopulation Diversity in Isotopic Niche Over Landscapes: Spatial Patterns Inform Conservation of Bear–Salmon Systems |
title_short |
Intrapopulation Diversity in Isotopic Niche Over Landscapes: Spatial Patterns Inform Conservation of Bear–Salmon Systems |
title_full |
Intrapopulation Diversity in Isotopic Niche Over Landscapes: Spatial Patterns Inform Conservation of Bear–Salmon Systems |
title_fullStr |
Intrapopulation Diversity in Isotopic Niche Over Landscapes: Spatial Patterns Inform Conservation of Bear–Salmon Systems |
title_full_unstemmed |
Intrapopulation Diversity in Isotopic Niche Over Landscapes: Spatial Patterns Inform Conservation of Bear–Salmon Systems |
title_sort |
intrapopulation diversity in isotopic niche over landscapes: spatial patterns inform conservation of bear–salmon systems |
publisher |
WBI Studies Repository |
publishDate |
2017 |
url |
https://www.wellbeingintlstudiesrepository.org/popdhab/1 https://www.wellbeingintlstudiesrepository.org/context/popdhab/article/1000/viewcontent/Adams_et_al_2017_Ecosphere.pdf |
long_lat |
ENVELOPE(-125.003,-125.003,54.000,54.000) |
geographic |
British Columbia Canada |
geographic_facet |
British Columbia Canada |
genre |
Ursus arctos |
genre_facet |
Ursus arctos |
op_source |
Population Distribution and Habitat Collection |
op_relation |
https://www.wellbeingintlstudiesrepository.org/popdhab/1 https://www.wellbeingintlstudiesrepository.org/context/popdhab/article/1000/viewcontent/Adams_et_al_2017_Ecosphere.pdf |
_version_ |
1769009786623361024 |