Spatio-temporal recruitment dynamics of mountain-dwelling caribou in the Yukon Territory, Canada
Understanding processes and mechanisms resulting in observed ecological patterns is critical information for biologists charged with effectively managing and conserving wildlife populations. In many areas across North America woodland caribou (Rangifer tarandus caribou Gmelin) populations are declin...
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University of Alaska Fairbanks
2010
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ftproquest:oai:pqdtoai.proquest.com:3436657 2023-05-15T15:50:56+02:00 Spatio-temporal recruitment dynamics of mountain-dwelling caribou in the Yukon Territory, Canada Hegel, Troy M. 2010-01-01 00:00:01.0 http://pqdtopen.proquest.com/#viewpdf?dispub=3436657 ENG eng University of Alaska Fairbanks http://pqdtopen.proquest.com/#viewpdf?dispub=3436657 Wildlife Conservation|Ecology thesis 2010 ftproquest 2021-03-13T17:41:25Z Understanding processes and mechanisms resulting in observed ecological patterns is critical information for biologists charged with effectively managing and conserving wildlife populations. In many areas across North America woodland caribou (Rangifer tarandus caribou Gmelin) populations are declining, as are caribou and reindeer populations globally. Why these declines are occurring is a key research question of biologists and managers. I investigated factors influencing recruitment of mountain-dwelling woodland caribou using long-term time series from ten herds (populations) in the Yukon Territory, Canada (Yukon). Recruitment was indexed by the calf:cow ratio observed during the fall breeding season using data collected during aerial monitoring surveys. I first examined the seasonal effects of the Pacific Decadal Oscillation (PDO), on observed recruitment in these herds. The PDO was positively related to recruitment and had its strongest effect during the winter preceding birth and immediately before calving. These results indicate that female body condition, and hence conception rates, were not affecting observed recruitment patterns. Rather, parturition and/or early calf survival were the most likely vital rates affecting the number of calves being recruited into the breeding population. I next examined the interacting effect of large-scale climate (PDO) and predation [wolf (Canis lupus L.) density] on recruitment in the Finlayson herd of east-central Yukon. A large-scale wolf control program in the 1980s allowed me to assess recruitment over a range of wolf densities and climatic conditions. The effect of the PDO immediately before calving was negligible when wolf numbers were significantly reduced indicating the climatic effect was modified by wolf density. Additionally, as springtime climate improved (i.e. increasing PDO) the difference in recruitment between years with and without wolf removals was reduced. Thesis Canis lupus Rangifer tarandus Yukon PQDT Open: Open Access Dissertations and Theses (ProQuest) Canada Pacific Yukon |
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Open Polar |
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PQDT Open: Open Access Dissertations and Theses (ProQuest) |
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ftproquest |
language |
English |
topic |
Wildlife Conservation|Ecology |
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Wildlife Conservation|Ecology Hegel, Troy M. Spatio-temporal recruitment dynamics of mountain-dwelling caribou in the Yukon Territory, Canada |
topic_facet |
Wildlife Conservation|Ecology |
description |
Understanding processes and mechanisms resulting in observed ecological patterns is critical information for biologists charged with effectively managing and conserving wildlife populations. In many areas across North America woodland caribou (Rangifer tarandus caribou Gmelin) populations are declining, as are caribou and reindeer populations globally. Why these declines are occurring is a key research question of biologists and managers. I investigated factors influencing recruitment of mountain-dwelling woodland caribou using long-term time series from ten herds (populations) in the Yukon Territory, Canada (Yukon). Recruitment was indexed by the calf:cow ratio observed during the fall breeding season using data collected during aerial monitoring surveys. I first examined the seasonal effects of the Pacific Decadal Oscillation (PDO), on observed recruitment in these herds. The PDO was positively related to recruitment and had its strongest effect during the winter preceding birth and immediately before calving. These results indicate that female body condition, and hence conception rates, were not affecting observed recruitment patterns. Rather, parturition and/or early calf survival were the most likely vital rates affecting the number of calves being recruited into the breeding population. I next examined the interacting effect of large-scale climate (PDO) and predation [wolf (Canis lupus L.) density] on recruitment in the Finlayson herd of east-central Yukon. A large-scale wolf control program in the 1980s allowed me to assess recruitment over a range of wolf densities and climatic conditions. The effect of the PDO immediately before calving was negligible when wolf numbers were significantly reduced indicating the climatic effect was modified by wolf density. Additionally, as springtime climate improved (i.e. increasing PDO) the difference in recruitment between years with and without wolf removals was reduced. |
format |
Thesis |
author |
Hegel, Troy M. |
author_facet |
Hegel, Troy M. |
author_sort |
Hegel, Troy M. |
title |
Spatio-temporal recruitment dynamics of mountain-dwelling caribou in the Yukon Territory, Canada |
title_short |
Spatio-temporal recruitment dynamics of mountain-dwelling caribou in the Yukon Territory, Canada |
title_full |
Spatio-temporal recruitment dynamics of mountain-dwelling caribou in the Yukon Territory, Canada |
title_fullStr |
Spatio-temporal recruitment dynamics of mountain-dwelling caribou in the Yukon Territory, Canada |
title_full_unstemmed |
Spatio-temporal recruitment dynamics of mountain-dwelling caribou in the Yukon Territory, Canada |
title_sort |
spatio-temporal recruitment dynamics of mountain-dwelling caribou in the yukon territory, canada |
publisher |
University of Alaska Fairbanks |
publishDate |
2010 |
url |
http://pqdtopen.proquest.com/#viewpdf?dispub=3436657 |
geographic |
Canada Pacific Yukon |
geographic_facet |
Canada Pacific Yukon |
genre |
Canis lupus Rangifer tarandus Yukon |
genre_facet |
Canis lupus Rangifer tarandus Yukon |
op_relation |
http://pqdtopen.proquest.com/#viewpdf?dispub=3436657 |
_version_ |
1766385977859768320 |