Winter forage selection by barren-ground caribou: effects of fire and snow
Thesis (M.S.) University of Alaska Fairbanks, 1993 Snow depth and hardness were the most influential factors in selection of feeding areas by caribou (Rangifer tarandus) in late winter in northwestern Alaska. Following a 1988 fire, plots were established in late March through April in burned and unb...
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ftunivalaska:oai:scholarworks.alaska.edu:11122/7428 2023-05-15T18:04:23+02:00 Winter forage selection by barren-ground caribou: effects of fire and snow Saperstein, Lisa Beth 1993-05 http://hdl.handle.net/11122/7428 en_US eng http://hdl.handle.net/11122/7428 Barren ground caribou Caribou Behavior Thesis ms 1993 ftunivalaska 2023-04-06T17:53:19Z Thesis (M.S.) University of Alaska Fairbanks, 1993 Snow depth and hardness were the most influential factors in selection of feeding areas by caribou (Rangifer tarandus) in late winter in northwestern Alaska. Following a 1988 fire, plots were established in late March through April in burned and unbumed tussock tundra in 1990 and 1991. Snow in both burned and unbumed plots was shallower and softer at edges of caribou feeding craters than at adjacent undisturbed points in both years. There was little difference in snow depth or hardness between burned and unbumed plots, although caribou cratered in shallower snow in burned plots than in unbumed plots in 1990. Crater area was greater in unbumed plots in 1990, but there was no difference in crater area between burned and unbumed plots in 1991. Frequencies of particular plant taxa were only significant in determining selection of crater sites in unbumed plots in 1990, when caribou craters had higher relative frequencies of lichens and lower frequencies of bryophytes than unused areas. Fire reduced relative frequency and biomass of most plant taxa, with the exception of post-disturbance species, which occurred primarily in burned plots. Lichens were reduced in burned plots, and lichens composed 59-74% of the late-winter diet of caribou, as determined by microhistological analysis of fecal pellets. Biomass and relative frequency of Eriophorum vaginatum was greater in burned plots than in unbumed plots in 1991, and protein and in vitro digestibility levels were enhanced in samples of this species collected from burned plots in late winter. Thesis Rangifer tarandus Tundra Alaska University of Alaska: ScholarWorks@UA Fairbanks |
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Open Polar |
collection |
University of Alaska: ScholarWorks@UA |
op_collection_id |
ftunivalaska |
language |
English |
topic |
Barren ground caribou Caribou Behavior |
spellingShingle |
Barren ground caribou Caribou Behavior Saperstein, Lisa Beth Winter forage selection by barren-ground caribou: effects of fire and snow |
topic_facet |
Barren ground caribou Caribou Behavior |
description |
Thesis (M.S.) University of Alaska Fairbanks, 1993 Snow depth and hardness were the most influential factors in selection of feeding areas by caribou (Rangifer tarandus) in late winter in northwestern Alaska. Following a 1988 fire, plots were established in late March through April in burned and unbumed tussock tundra in 1990 and 1991. Snow in both burned and unbumed plots was shallower and softer at edges of caribou feeding craters than at adjacent undisturbed points in both years. There was little difference in snow depth or hardness between burned and unbumed plots, although caribou cratered in shallower snow in burned plots than in unbumed plots in 1990. Crater area was greater in unbumed plots in 1990, but there was no difference in crater area between burned and unbumed plots in 1991. Frequencies of particular plant taxa were only significant in determining selection of crater sites in unbumed plots in 1990, when caribou craters had higher relative frequencies of lichens and lower frequencies of bryophytes than unused areas. Fire reduced relative frequency and biomass of most plant taxa, with the exception of post-disturbance species, which occurred primarily in burned plots. Lichens were reduced in burned plots, and lichens composed 59-74% of the late-winter diet of caribou, as determined by microhistological analysis of fecal pellets. Biomass and relative frequency of Eriophorum vaginatum was greater in burned plots than in unbumed plots in 1991, and protein and in vitro digestibility levels were enhanced in samples of this species collected from burned plots in late winter. |
format |
Thesis |
author |
Saperstein, Lisa Beth |
author_facet |
Saperstein, Lisa Beth |
author_sort |
Saperstein, Lisa Beth |
title |
Winter forage selection by barren-ground caribou: effects of fire and snow |
title_short |
Winter forage selection by barren-ground caribou: effects of fire and snow |
title_full |
Winter forage selection by barren-ground caribou: effects of fire and snow |
title_fullStr |
Winter forage selection by barren-ground caribou: effects of fire and snow |
title_full_unstemmed |
Winter forage selection by barren-ground caribou: effects of fire and snow |
title_sort |
winter forage selection by barren-ground caribou: effects of fire and snow |
publishDate |
1993 |
url |
http://hdl.handle.net/11122/7428 |
geographic |
Fairbanks |
geographic_facet |
Fairbanks |
genre |
Rangifer tarandus Tundra Alaska |
genre_facet |
Rangifer tarandus Tundra Alaska |
op_relation |
http://hdl.handle.net/11122/7428 |
_version_ |
1766175750891765760 |