Cyclic dynamics of snowshoe hares on a small island in the Yukon
(5 km2) in Kluane Lake, southwestern Yukon, and on nearby mainland sites. Jacquot Island hares averaged twice the density of mainland control populations and, although they show 10-year cycles, fluctuate with much lower amplitude than mainland populations. Three separate intensive studies over 6 yea...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.520.1294 2023-05-15T15:12:43+02:00 Cyclic dynamics of snowshoe hares on a small island in the Yukon Charles J. Krebs Todd N. Zimmerling Claire Jardine Kim A. Trostel Alice J. Kenney Scott Gilbert Elizabeth J. Hofer The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.520.1294 http://faculty.jsd.claremont.edu/dmcfarlane/bio146mcfarlane/papers/snowshoe hares.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.520.1294 http://faculty.jsd.claremont.edu/dmcfarlane/bio146mcfarlane/papers/snowshoe hares.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://faculty.jsd.claremont.edu/dmcfarlane/bio146mcfarlane/papers/snowshoe hares.pdf text ftciteseerx 2016-01-08T10:05:19Z (5 km2) in Kluane Lake, southwestern Yukon, and on nearby mainland sites. Jacquot Island hares averaged twice the density of mainland control populations and, although they show 10-year cycles, fluctuate with much lower amplitude than mainland populations. Three separate intensive studies over 6 years attempted to determine what caused these dif-ferences. We tested two hypotheses to explain the dynamics. Reproductive rates of hares were similar on Jacquot Island and the mainland. Adult survival rates were higher on the island in most years, with the exception of years of popula-tion decline. Juvenile survival rates from 0 to 30 days of life were much higher on the island than on the mainland ex-cept for decline summers. The adult- and juvenile-survival differences between the island and the mainland were explained most consistently by predation. Improved survival on the island is correlated with a reduction in the numbers and types of predators found on Jacquot Island compared with the mainland. In particular, red squirrels were rare on Jacquot Island, arctic ground squirrels were absent, and the larger predators, like lynx and great-horned owls, were spo-radic in occurrence on this small island. Résumé: Des populations de lièvres d’amérique (Lepus americanus) ont été suivies de 1977 à 2001 sur l’Île Jacquot (5 km2) au Lac Kluane (sud-ouest du Yukon), ainsi qu’à des sites sur la terre ferme, à proximité. Les densités de liè-vres sur l’Île Jacquot équivalent en moyenne au double de celles des populations témoins sur la terre ferme et, quoique les premières fluctuent selon un cycle de 10 ans, leurs fluctuations sont d’une amplitude de beaucoup inférieure à cel- Text Arctic Lynx Yukon Unknown Arctic Jacquot Island ENVELOPE(-138.769,-138.769,61.329,61.329) Kluane Lake ENVELOPE(-138.773,-138.773,61.261,61.261) Yukon |
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Open Polar |
collection |
Unknown |
op_collection_id |
ftciteseerx |
language |
English |
description |
(5 km2) in Kluane Lake, southwestern Yukon, and on nearby mainland sites. Jacquot Island hares averaged twice the density of mainland control populations and, although they show 10-year cycles, fluctuate with much lower amplitude than mainland populations. Three separate intensive studies over 6 years attempted to determine what caused these dif-ferences. We tested two hypotheses to explain the dynamics. Reproductive rates of hares were similar on Jacquot Island and the mainland. Adult survival rates were higher on the island in most years, with the exception of years of popula-tion decline. Juvenile survival rates from 0 to 30 days of life were much higher on the island than on the mainland ex-cept for decline summers. The adult- and juvenile-survival differences between the island and the mainland were explained most consistently by predation. Improved survival on the island is correlated with a reduction in the numbers and types of predators found on Jacquot Island compared with the mainland. In particular, red squirrels were rare on Jacquot Island, arctic ground squirrels were absent, and the larger predators, like lynx and great-horned owls, were spo-radic in occurrence on this small island. Résumé: Des populations de lièvres d’amérique (Lepus americanus) ont été suivies de 1977 à 2001 sur l’Île Jacquot (5 km2) au Lac Kluane (sud-ouest du Yukon), ainsi qu’à des sites sur la terre ferme, à proximité. Les densités de liè-vres sur l’Île Jacquot équivalent en moyenne au double de celles des populations témoins sur la terre ferme et, quoique les premières fluctuent selon un cycle de 10 ans, leurs fluctuations sont d’une amplitude de beaucoup inférieure à cel- |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Charles J. Krebs Todd N. Zimmerling Claire Jardine Kim A. Trostel Alice J. Kenney Scott Gilbert Elizabeth J. Hofer |
spellingShingle |
Charles J. Krebs Todd N. Zimmerling Claire Jardine Kim A. Trostel Alice J. Kenney Scott Gilbert Elizabeth J. Hofer Cyclic dynamics of snowshoe hares on a small island in the Yukon |
author_facet |
Charles J. Krebs Todd N. Zimmerling Claire Jardine Kim A. Trostel Alice J. Kenney Scott Gilbert Elizabeth J. Hofer |
author_sort |
Charles J. Krebs |
title |
Cyclic dynamics of snowshoe hares on a small island in the Yukon |
title_short |
Cyclic dynamics of snowshoe hares on a small island in the Yukon |
title_full |
Cyclic dynamics of snowshoe hares on a small island in the Yukon |
title_fullStr |
Cyclic dynamics of snowshoe hares on a small island in the Yukon |
title_full_unstemmed |
Cyclic dynamics of snowshoe hares on a small island in the Yukon |
title_sort |
cyclic dynamics of snowshoe hares on a small island in the yukon |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.520.1294 http://faculty.jsd.claremont.edu/dmcfarlane/bio146mcfarlane/papers/snowshoe hares.pdf |
long_lat |
ENVELOPE(-138.769,-138.769,61.329,61.329) ENVELOPE(-138.773,-138.773,61.261,61.261) |
geographic |
Arctic Jacquot Island Kluane Lake Yukon |
geographic_facet |
Arctic Jacquot Island Kluane Lake Yukon |
genre |
Arctic Lynx Yukon |
genre_facet |
Arctic Lynx Yukon |
op_source |
http://faculty.jsd.claremont.edu/dmcfarlane/bio146mcfarlane/papers/snowshoe hares.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.520.1294 http://faculty.jsd.claremont.edu/dmcfarlane/bio146mcfarlane/papers/snowshoe hares.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
_version_ |
1766343357210034176 |