The effects of collared pika grazing on alpine tundra vegetation in southwestern Yukon, Canada
grantor: University of Toronto In alpine tundra vegetation, rates of plant production were as low in 15-17 day short-term 'in situ' pika removal exclosures as they were in control, unexclosed plots. After nearly two seasons of herbivore exclusion, sites with a history of grazing had much h...
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ftunivtoronto:oai:localhost:1807/14084 2023-05-15T18:40:09+02:00 The effects of collared pika grazing on alpine tundra vegetation in southwestern Yukon, Canada McIntire, Eliot Jonathan Benet 1999 10122151 bytes application/pdf http://hdl.handle.net/1807/14084 http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp01/MQ45889.pdf en en_US eng http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp01/MQ45889.pdf http://hdl.handle.net/1807/14084 Thesis 1999 ftunivtoronto 2020-06-17T11:12:05Z grantor: University of Toronto In alpine tundra vegetation, rates of plant production were as low in 15-17 day short-term 'in situ' pika removal exclosures as they were in control, unexclosed plots. After nearly two seasons of herbivore exclusion, sites with a history of grazing had much higher production than sites with no history of grazing, demonstrating an important influence of past grazing pressures. I also found that the pattern of pika grazing influence changed between two disjunct field sites separated by 40km: pikas had a detectable impact up to 7 m from talus in one site, but only up to 2 m in the other. When the effect of grazing on leaf demography for three species was examined, grazing history, rather than current season grazing, was found to affect growth traits. In a common garden experiment, grazing history affected plant response to simulated pika herbivory in a sedge but not in a composite. In all three experiments, grazing history was found to have a profound and very important impact on plant growth. M.Sc. Thesis Tundra Yukon University of Toronto: Research Repository T-Space Yukon Canada |
institution |
Open Polar |
collection |
University of Toronto: Research Repository T-Space |
op_collection_id |
ftunivtoronto |
language |
English |
description |
grantor: University of Toronto In alpine tundra vegetation, rates of plant production were as low in 15-17 day short-term 'in situ' pika removal exclosures as they were in control, unexclosed plots. After nearly two seasons of herbivore exclusion, sites with a history of grazing had much higher production than sites with no history of grazing, demonstrating an important influence of past grazing pressures. I also found that the pattern of pika grazing influence changed between two disjunct field sites separated by 40km: pikas had a detectable impact up to 7 m from talus in one site, but only up to 2 m in the other. When the effect of grazing on leaf demography for three species was examined, grazing history, rather than current season grazing, was found to affect growth traits. In a common garden experiment, grazing history affected plant response to simulated pika herbivory in a sedge but not in a composite. In all three experiments, grazing history was found to have a profound and very important impact on plant growth. M.Sc. |
format |
Thesis |
author |
McIntire, Eliot Jonathan Benet |
spellingShingle |
McIntire, Eliot Jonathan Benet The effects of collared pika grazing on alpine tundra vegetation in southwestern Yukon, Canada |
author_facet |
McIntire, Eliot Jonathan Benet |
author_sort |
McIntire, Eliot Jonathan Benet |
title |
The effects of collared pika grazing on alpine tundra vegetation in southwestern Yukon, Canada |
title_short |
The effects of collared pika grazing on alpine tundra vegetation in southwestern Yukon, Canada |
title_full |
The effects of collared pika grazing on alpine tundra vegetation in southwestern Yukon, Canada |
title_fullStr |
The effects of collared pika grazing on alpine tundra vegetation in southwestern Yukon, Canada |
title_full_unstemmed |
The effects of collared pika grazing on alpine tundra vegetation in southwestern Yukon, Canada |
title_sort |
effects of collared pika grazing on alpine tundra vegetation in southwestern yukon, canada |
publishDate |
1999 |
url |
http://hdl.handle.net/1807/14084 http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp01/MQ45889.pdf |
geographic |
Yukon Canada |
geographic_facet |
Yukon Canada |
genre |
Tundra Yukon |
genre_facet |
Tundra Yukon |
op_relation |
http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp01/MQ45889.pdf http://hdl.handle.net/1807/14084 |
_version_ |
1766229356003196928 |