Small Mammal Bait Preference and Methods of Population Size Estimation in Subarctic and Arctic Ecosystems
Small mammals are commonly captured in baited traps for management-related estimates of population size and species diversity. Bait preferences by species may alter their trappability, affecting abundance or diversity estimates. Here our objective was to evaluate whether the trappability of differen...
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ftstateuninycesf:oai:digitalcommons.esf.edu:honors-1042 2023-05-15T15:09:24+02:00 Small Mammal Bait Preference and Methods of Population Size Estimation in Subarctic and Arctic Ecosystems Keiter, Dave 2013-04-01T07:00:00Z application/pdf https://digitalcommons.esf.edu/honors/8 https://digitalcommons.esf.edu/cgi/viewcontent.cgi?article=1042&context=honors unknown Digital Commons @ ESF https://digitalcommons.esf.edu/honors/8 https://digitalcommons.esf.edu/cgi/viewcontent.cgi?article=1042&context=honors Honors Theses Zoology text 2013 ftstateuninycesf 2021-07-26T09:49:45Z Small mammals are commonly captured in baited traps for management-related estimates of population size and species diversity. Bait preferences by species may alter their trappability, affecting abundance or diversity estimates. Here our objective was to evaluate whether the trappability of different species varied according to bait type at 3 sites in interior Alaska. Between July and August of 2011, we deployed 200 Sherman live-traps spaced 10 meters apart at each site for 5 nights, and alternated 2 commonly used baits (a peanut butter/oat mixture or oats alone). We live-captured 52 animals of 6 species at the White Mountains site, 70 animals of 4 species at the Middle Tanana site, and 40 animals of 4 species at the Brooks Range site. We then tested for differences in initial capture and recapture rates using a McNemar’s test. No significant differences were observed between bait types for any variable or species. A machine-learning program, TreeNet, provided further evidence that bait type explained less variance and was less predictive of the initial capture or recapture of a species than elevation, ground cover, or shrub cover. Thus, estimates of relative abundance and species diversity should be robust across studies, although different baits than those tested may have greater effects for certain small mammal groups. Further investigation should be pursued into whether this lack of preference is a result of food limitations caused by a short growing season in higher latitudes. Text Arctic Brooks Range Subarctic Alaska SUNY College of Environmental Science and Forestry: Digital Commons @ ESF (State University of New York) Arctic |
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SUNY College of Environmental Science and Forestry: Digital Commons @ ESF (State University of New York) |
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Zoology |
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Zoology Keiter, Dave Small Mammal Bait Preference and Methods of Population Size Estimation in Subarctic and Arctic Ecosystems |
topic_facet |
Zoology |
description |
Small mammals are commonly captured in baited traps for management-related estimates of population size and species diversity. Bait preferences by species may alter their trappability, affecting abundance or diversity estimates. Here our objective was to evaluate whether the trappability of different species varied according to bait type at 3 sites in interior Alaska. Between July and August of 2011, we deployed 200 Sherman live-traps spaced 10 meters apart at each site for 5 nights, and alternated 2 commonly used baits (a peanut butter/oat mixture or oats alone). We live-captured 52 animals of 6 species at the White Mountains site, 70 animals of 4 species at the Middle Tanana site, and 40 animals of 4 species at the Brooks Range site. We then tested for differences in initial capture and recapture rates using a McNemar’s test. No significant differences were observed between bait types for any variable or species. A machine-learning program, TreeNet, provided further evidence that bait type explained less variance and was less predictive of the initial capture or recapture of a species than elevation, ground cover, or shrub cover. Thus, estimates of relative abundance and species diversity should be robust across studies, although different baits than those tested may have greater effects for certain small mammal groups. Further investigation should be pursued into whether this lack of preference is a result of food limitations caused by a short growing season in higher latitudes. |
format |
Text |
author |
Keiter, Dave |
author_facet |
Keiter, Dave |
author_sort |
Keiter, Dave |
title |
Small Mammal Bait Preference and Methods of Population Size Estimation in Subarctic and Arctic Ecosystems |
title_short |
Small Mammal Bait Preference and Methods of Population Size Estimation in Subarctic and Arctic Ecosystems |
title_full |
Small Mammal Bait Preference and Methods of Population Size Estimation in Subarctic and Arctic Ecosystems |
title_fullStr |
Small Mammal Bait Preference and Methods of Population Size Estimation in Subarctic and Arctic Ecosystems |
title_full_unstemmed |
Small Mammal Bait Preference and Methods of Population Size Estimation in Subarctic and Arctic Ecosystems |
title_sort |
small mammal bait preference and methods of population size estimation in subarctic and arctic ecosystems |
publisher |
Digital Commons @ ESF |
publishDate |
2013 |
url |
https://digitalcommons.esf.edu/honors/8 https://digitalcommons.esf.edu/cgi/viewcontent.cgi?article=1042&context=honors |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Brooks Range Subarctic Alaska |
genre_facet |
Arctic Brooks Range Subarctic Alaska |
op_source |
Honors Theses |
op_relation |
https://digitalcommons.esf.edu/honors/8 https://digitalcommons.esf.edu/cgi/viewcontent.cgi?article=1042&context=honors |
_version_ |
1766340603884339200 |