Changes in spring arrival of NearcticNeotropical migrants attributed to multiscalar climate. Global Change Biology 13:2239–2251

Climate-related changes associated with the California marine ecosystem have been documented; however, there are no studies assessing changes in terrestrial vertebrate phenology on the Pacific coast of western North America. We analyze the spring phenology of 21 Nearctic-Neotropical migratory songbi...

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Bibliographic Details
Main Authors: Dena P. Macmynowski, Terry L. Root, Grant Ballardw, Geoffrey R. Geupelw
Other Authors: The Pennsylvania State University CiteSeerX Archives
Format: Text
Language:English
Subjects:
California
climate change
ENSO
MEI
migration
NAO
Pacific flyway
passerine
PDO
phenology
Pacific
North Atlantic
North Atlantic oscillation
Online Access:http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.390.9004
http://www.prbo.org/cms/docs/terre/MacMynowskietal2007.pdf
Description
Summary:Climate-related changes associated with the California marine ecosystem have been documented; however, there are no studies assessing changes in terrestrial vertebrate phenology on the Pacific coast of western North America. We analyze the spring phenology of 21 Nearctic-Neotropical migratory songbird species in central and northern CA. Using observational and banding data at multiple sites, we evaluate evidence for a change in arrival timing being linked to either nonclimatic or multiscalar climatic explanations. Using correlation analysis, of the 13 species with a significant (Po0.10) change in arrival, the arrival timing of 10 species (77%) is associated with both temperature and a large-scale climate oscillation index (El Niño Southern Oscillation, ENSO; North Atlantic Oscillation, NAO; and/or Pacific Decadal Oscillation, PDO) at least at one location. Eight of the 13 species (62%) are advancing their migratory timing. All species for which spring arrival is associated with climate at multiple locations are exhibiting changes (n 5 5) and all species lacking evidence for association between migration phenology and climate (n 5 3) exhibit no change. Migrants tend to arrive earlier in association with warmer temperatures, positive NAO indices, and stronger ENSO indices. Twelve species negatively correlate (P 0.05) with local or regional temperature at least at one location; five species negatively correlate with ENSO. Eleven species ’ arrival is correlated (P 0.05) with NAO; 10 are negatively associated. After an exhaustive literature search, this is apparently the first documentation of an association between NAO and migratory phenology in western North America.

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