Non-parallel changes in songbird migration timing are not explained by changes in stopover duration.

ABSTRACT: Shifts in the timing of animal migration are widespread and well-documented; however, the mechanism underlying these changes is largely unknown. In this study, we test the hypothesis that systematic changes in stopover duration-the time that individuals spend resting and refueling at a site-are driving shifts in songbird migration timing. Specifically, we predicted that increases in stopover duration at our study site could generate increases in passage duration-the number of days that a study site is occupied by a particular species-by changing the temporal breadth of observations and vise versa. We analyzed an uninterrupted 46-year bird banding dataset from Massachusetts, USA using quantile regression, which allowed us to detect changes in early-and late-arriving birds, as well as change

SUBMITTER: Dorian NN 

PROVIDER: S-EPMC7243817 | biostudies-literature | 2020

REPOSITORIES: biostudies-literature