Seasonal effects of Pacific‐based climate on recruitment in a predator‐limited large herbivore
Summary 1. Climate is an important factor influencing the population dynamics of large herbivores operating directly on individuals or through its effect on forage characteristics. However, the seasonal effect of climate may differ between forage‐ and predator‐limited populations because of a climat...
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Online Access: | http://dx.doi.org/10.1111/j.1365-2656.2009.01647.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1365-2656.2009.01647.x https://besjournals.onlinelibrary.wiley.com/doi/pdf/10.1111/j.1365-2656.2009.01647.x |
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crwiley:10.1111/j.1365-2656.2009.01647.x 2024-06-02T08:13:39+00:00 Seasonal effects of Pacific‐based climate on recruitment in a predator‐limited large herbivore Hegel, Troy M. Mysterud, Atle Ergon, Torbjørn Loe, Leif Egil Huettmann, Falk Stenseth, Nils Chr. 2010 http://dx.doi.org/10.1111/j.1365-2656.2009.01647.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1365-2656.2009.01647.x https://besjournals.onlinelibrary.wiley.com/doi/pdf/10.1111/j.1365-2656.2009.01647.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Journal of Animal Ecology volume 79, issue 2, page 471-482 ISSN 0021-8790 1365-2656 journal-article 2010 crwiley https://doi.org/10.1111/j.1365-2656.2009.01647.x 2024-05-03T10:48:35Z Summary 1. Climate is an important factor influencing the population dynamics of large herbivores operating directly on individuals or through its effect on forage characteristics. However, the seasonal effect of climate may differ between forage‐ and predator‐limited populations because of a climatic influence on predation rates. The influence of climate on predator‐limited large herbivores is less well known than on forage‐limited populations. Further, the effect of Pacific‐based climate on large herbivore populations has been rarely assessed. 2. We investigated the effect of the Pacific Decadal Oscillation (PDO), across different seasons, on recruitment in 10 populations (herds) of mountain‐dwelling caribou Rangifer tarandus caribou L. in the Yukon Territory, Canada. These low‐density populations occur in highly seasonal environments and are considered predator‐limited with high neonatal calf mortality. Hence, in most years females do not spend resources through lactational support during the summer and resource intake is devoted to self‐maintenance. We predicted that climate affecting environmental conditions at calving would have a strong effect on recruitment via its influence on predation rates. We also predicted that climatic conditions prior to conception could have an effect on recruitment through its influence on female fecundity. We modelled recruitment ( n = 165) by seasonal PDO values using generalized linear mixed‐effects models with herd‐varying coefficients. 3. We found that recruitment variability was best explained by variation in winter climate (β = 0·110, SE = 0·007) prior to birth ( in utero ) and May climate (β = 0·013, SE = 0·006) at calving. There was little support for a pre‐conception climate effect influencing female body condition and hence fecundity. These results confirm that recruitment in these populations is limited by predation and that forage‐limitation is not a significant factor in their population dynamics. There was considerable variability in herd‐specific relationships ... Article in Journal/Newspaper Rangifer tarandus Yukon Wiley Online Library Canada Pacific Yukon Journal of Animal Ecology 79 2 471 482 |
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Open Polar |
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Wiley Online Library |
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crwiley |
language |
English |
description |
Summary 1. Climate is an important factor influencing the population dynamics of large herbivores operating directly on individuals or through its effect on forage characteristics. However, the seasonal effect of climate may differ between forage‐ and predator‐limited populations because of a climatic influence on predation rates. The influence of climate on predator‐limited large herbivores is less well known than on forage‐limited populations. Further, the effect of Pacific‐based climate on large herbivore populations has been rarely assessed. 2. We investigated the effect of the Pacific Decadal Oscillation (PDO), across different seasons, on recruitment in 10 populations (herds) of mountain‐dwelling caribou Rangifer tarandus caribou L. in the Yukon Territory, Canada. These low‐density populations occur in highly seasonal environments and are considered predator‐limited with high neonatal calf mortality. Hence, in most years females do not spend resources through lactational support during the summer and resource intake is devoted to self‐maintenance. We predicted that climate affecting environmental conditions at calving would have a strong effect on recruitment via its influence on predation rates. We also predicted that climatic conditions prior to conception could have an effect on recruitment through its influence on female fecundity. We modelled recruitment ( n = 165) by seasonal PDO values using generalized linear mixed‐effects models with herd‐varying coefficients. 3. We found that recruitment variability was best explained by variation in winter climate (β = 0·110, SE = 0·007) prior to birth ( in utero ) and May climate (β = 0·013, SE = 0·006) at calving. There was little support for a pre‐conception climate effect influencing female body condition and hence fecundity. These results confirm that recruitment in these populations is limited by predation and that forage‐limitation is not a significant factor in their population dynamics. There was considerable variability in herd‐specific relationships ... |
format |
Article in Journal/Newspaper |
author |
Hegel, Troy M. Mysterud, Atle Ergon, Torbjørn Loe, Leif Egil Huettmann, Falk Stenseth, Nils Chr. |
spellingShingle |
Hegel, Troy M. Mysterud, Atle Ergon, Torbjørn Loe, Leif Egil Huettmann, Falk Stenseth, Nils Chr. Seasonal effects of Pacific‐based climate on recruitment in a predator‐limited large herbivore |
author_facet |
Hegel, Troy M. Mysterud, Atle Ergon, Torbjørn Loe, Leif Egil Huettmann, Falk Stenseth, Nils Chr. |
author_sort |
Hegel, Troy M. |
title |
Seasonal effects of Pacific‐based climate on recruitment in a predator‐limited large herbivore |
title_short |
Seasonal effects of Pacific‐based climate on recruitment in a predator‐limited large herbivore |
title_full |
Seasonal effects of Pacific‐based climate on recruitment in a predator‐limited large herbivore |
title_fullStr |
Seasonal effects of Pacific‐based climate on recruitment in a predator‐limited large herbivore |
title_full_unstemmed |
Seasonal effects of Pacific‐based climate on recruitment in a predator‐limited large herbivore |
title_sort |
seasonal effects of pacific‐based climate on recruitment in a predator‐limited large herbivore |
publisher |
Wiley |
publishDate |
2010 |
url |
http://dx.doi.org/10.1111/j.1365-2656.2009.01647.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1365-2656.2009.01647.x https://besjournals.onlinelibrary.wiley.com/doi/pdf/10.1111/j.1365-2656.2009.01647.x |
geographic |
Canada Pacific Yukon |
geographic_facet |
Canada Pacific Yukon |
genre |
Rangifer tarandus Yukon |
genre_facet |
Rangifer tarandus Yukon |
op_source |
Journal of Animal Ecology volume 79, issue 2, page 471-482 ISSN 0021-8790 1365-2656 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/j.1365-2656.2009.01647.x |
container_title |
Journal of Animal Ecology |
container_volume |
79 |
container_issue |
2 |
container_start_page |
471 |
op_container_end_page |
482 |
_version_ |
1800737227150458880 |