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Changes in the annual cycle of North American raptors associated with recent shifts in migration timing


Van Buskirk, J (2012). Changes in the annual cycle of North American raptors associated with recent shifts in migration timing. The Auk, 129(4):691-698.

Abstract

Recent changes in the timing of spring migration associated with climate change are occurring in hundreds of species of Northern Hemisphere birds. Much less is known about impacts on autumn migration, especially for birds of prey. I studied simultaneous changes in spring and autumn phenology using data from 14 raptor species at two bird observatories on the shore of Lake Superior, North America. Median migration date advanced by 0.13 days∙year-1 in spring and delayed by 0.23 days∙year-1 in autumn, with significant heterogeneity among species. Long-distance migrants were observed late in spring and early in autumn, and showed less phenological change during autumn than short-distance migrants. The migratory period has become more extended, especially for short-distance migrants. Opposite responses during the two seasons had the effect of extending time spent to the north of the study area, by up to 30 days in some species since the early 1970s. These phenological shifts – potentially related to climate change – are causing dramatic changes in the annual cycle of North American raptors; whether these are beneficial or detrimental is unknown.

Abstract

Recent changes in the timing of spring migration associated with climate change are occurring in hundreds of species of Northern Hemisphere birds. Much less is known about impacts on autumn migration, especially for birds of prey. I studied simultaneous changes in spring and autumn phenology using data from 14 raptor species at two bird observatories on the shore of Lake Superior, North America. Median migration date advanced by 0.13 days∙year-1 in spring and delayed by 0.23 days∙year-1 in autumn, with significant heterogeneity among species. Long-distance migrants were observed late in spring and early in autumn, and showed less phenological change during autumn than short-distance migrants. The migratory period has become more extended, especially for short-distance migrants. Opposite responses during the two seasons had the effect of extending time spent to the north of the study area, by up to 30 days in some species since the early 1970s. These phenological shifts – potentially related to climate change – are causing dramatic changes in the annual cycle of North American raptors; whether these are beneficial or detrimental is unknown.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Institute of Evolutionary Biology and Environmental Studies
Dewey Decimal Classification:570 Life sciences; biology
590 Animals (Zoology)
Language:English
Date:2012
Deposited On:21 Jan 2013 13:23
Last Modified:05 Apr 2016 16:18
Publisher:American Ornithologists' Union
ISSN:0004-8038
Free access at:Publisher DOI. An embargo period may apply.
Publisher DOI:https://doi.org/10.1525/auk.2012.12061

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