Cyclic dynamics of snowshoe hares on a small island in the Yukon
Snowshoe hare (Lepus americanus) populations were monitored from 1977 to 2001 on Jacquot Island (5 km 2 ) 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, fluctuat...
Published in: | Canadian Journal of Zoology |
---|---|
Main Authors: | , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Canadian Science Publishing
2002
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1139/z02-143 http://www.nrcresearchpress.com/doi/pdf/10.1139/z02-143 |
id |
crcansciencepubl:10.1139/z02-143 |
---|---|
record_format |
openpolar |
spelling |
crcansciencepubl:10.1139/z02-143 2023-12-17T10:26:15+01:00 Cyclic dynamics of snowshoe hares on a small island in the Yukon Krebs, Charles J Zimmerling, Todd N Jardine, Claire Trostel, Kim A Kenney, Alice J Gilbert, Scott Hofer, Elizabeth J 2002 http://dx.doi.org/10.1139/z02-143 http://www.nrcresearchpress.com/doi/pdf/10.1139/z02-143 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Zoology volume 80, issue 8, page 1442-1450 ISSN 0008-4301 1480-3283 Animal Science and Zoology Ecology, Evolution, Behavior and Systematics journal-article 2002 crcansciencepubl https://doi.org/10.1139/z02-143 2023-11-19T13:38:54Z Snowshoe hare (Lepus americanus) populations were monitored from 1977 to 2001 on Jacquot Island (5 km 2 ) 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 differences. 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 population decline. Juvenile survival rates from 0 to 30 days of life were much higher on the island than on the mainland except 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 sporadic in occurrence on this small island. Article in Journal/Newspaper Arctic Lynx Yukon Canadian Science Publishing (via Crossref) Arctic Yukon Kluane Lake ENVELOPE(-138.773,-138.773,61.261,61.261) Jacquot Island ENVELOPE(-138.769,-138.769,61.329,61.329) Canadian Journal of Zoology 80 8 1442 1450 |
institution |
Open Polar |
collection |
Canadian Science Publishing (via Crossref) |
op_collection_id |
crcansciencepubl |
language |
English |
topic |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics |
spellingShingle |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics Krebs, Charles J Zimmerling, Todd N Jardine, Claire Trostel, Kim A Kenney, Alice J Gilbert, Scott Hofer, Elizabeth J Cyclic dynamics of snowshoe hares on a small island in the Yukon |
topic_facet |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics |
description |
Snowshoe hare (Lepus americanus) populations were monitored from 1977 to 2001 on Jacquot Island (5 km 2 ) 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 differences. 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 population decline. Juvenile survival rates from 0 to 30 days of life were much higher on the island than on the mainland except 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 sporadic in occurrence on this small island. |
format |
Article in Journal/Newspaper |
author |
Krebs, Charles J Zimmerling, Todd N Jardine, Claire Trostel, Kim A Kenney, Alice J Gilbert, Scott Hofer, Elizabeth J |
author_facet |
Krebs, Charles J Zimmerling, Todd N Jardine, Claire Trostel, Kim A Kenney, Alice J Gilbert, Scott Hofer, Elizabeth J |
author_sort |
Krebs, Charles J |
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 |
publisher |
Canadian Science Publishing |
publishDate |
2002 |
url |
http://dx.doi.org/10.1139/z02-143 http://www.nrcresearchpress.com/doi/pdf/10.1139/z02-143 |
long_lat |
ENVELOPE(-138.773,-138.773,61.261,61.261) ENVELOPE(-138.769,-138.769,61.329,61.329) |
geographic |
Arctic Yukon Kluane Lake Jacquot Island |
geographic_facet |
Arctic Yukon Kluane Lake Jacquot Island |
genre |
Arctic Lynx Yukon |
genre_facet |
Arctic Lynx Yukon |
op_source |
Canadian Journal of Zoology volume 80, issue 8, page 1442-1450 ISSN 0008-4301 1480-3283 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/z02-143 |
container_title |
Canadian Journal of Zoology |
container_volume |
80 |
container_issue |
8 |
container_start_page |
1442 |
op_container_end_page |
1450 |
_version_ |
1785577965750321152 |