Cargando…

Climate and density influence annual survival and movement in a migratory songbird

Assessing the drivers of survival across the annual cycle is important for understanding when and how population limitation occurs in migratory animals. Density‐dependent population regulation can occur during breeding and nonbreeding periods, and large‐scale climate cycles can also affect survival...

Descripción completa

Detalles Bibliográficos
Autores principales: McKellar, Ann E., Reudink, Matthew W., Marra, Peter P., Ratcliffe, Laurene M., Wilson, Scott
Formato: Online Artículo Texto
Lenguaje:English
Publicado: John Wiley and Sons Inc. 2015
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4717330/
https://www.ncbi.nlm.nih.gov/pubmed/26811763
http://dx.doi.org/10.1002/ece3.1854
_version_ 1782410634192748544
author McKellar, Ann E.
Reudink, Matthew W.
Marra, Peter P.
Ratcliffe, Laurene M.
Wilson, Scott
author_facet McKellar, Ann E.
Reudink, Matthew W.
Marra, Peter P.
Ratcliffe, Laurene M.
Wilson, Scott
author_sort McKellar, Ann E.
collection PubMed
description Assessing the drivers of survival across the annual cycle is important for understanding when and how population limitation occurs in migratory animals. Density‐dependent population regulation can occur during breeding and nonbreeding periods, and large‐scale climate cycles can also affect survival throughout the annual cycle via their effects on local weather and vegetation productivity. Most studies of survival use mark–recapture techniques to estimate apparent survival, but true survival rates remain obscured due to unknown rates of permanent emigration. This is especially problematic when assessing annual survival of migratory birds, whose movement between breeding attempts, or breeding dispersal, can be substantial. We used a multistate approach to examine drivers of annual survival and one component of breeding dispersal (habitat‐specific movements) in a population of American redstarts (Setophaga ruticilla) over 11 years in two adjacent habitat types. Annual survival displayed a curvilinear relation to the Southern Oscillation Index, with lower survival during La Niña and El Niño conditions. Although redstart density had no impact on survival, habitat‐specific density influenced local movements between habitat types, with redstarts being less likely to disperse from their previous year's breeding habitat as density within that habitat increased. This finding was strongest in males and may be explained by conspecific attraction influencing settlement decisions. Survival was lowest in young males, but movement was highest in this group, indicating that apparent survival rates were likely biased low due to permanent emigration. Our findings demonstrate the utility of examining breeding dispersal in mark–recapture studies and complement recent work using spatially explicit models of dispersal probability to obtain greater accuracy in survival estimates.
format Online
Article
Text
id pubmed-4717330
institution National Center for Biotechnology Information
language English
publishDate 2015
publisher John Wiley and Sons Inc.
record_format MEDLINE/PubMed
spelling pubmed-47173302016-01-25 Climate and density influence annual survival and movement in a migratory songbird McKellar, Ann E. Reudink, Matthew W. Marra, Peter P. Ratcliffe, Laurene M. Wilson, Scott Ecol Evol Original Research Assessing the drivers of survival across the annual cycle is important for understanding when and how population limitation occurs in migratory animals. Density‐dependent population regulation can occur during breeding and nonbreeding periods, and large‐scale climate cycles can also affect survival throughout the annual cycle via their effects on local weather and vegetation productivity. Most studies of survival use mark–recapture techniques to estimate apparent survival, but true survival rates remain obscured due to unknown rates of permanent emigration. This is especially problematic when assessing annual survival of migratory birds, whose movement between breeding attempts, or breeding dispersal, can be substantial. We used a multistate approach to examine drivers of annual survival and one component of breeding dispersal (habitat‐specific movements) in a population of American redstarts (Setophaga ruticilla) over 11 years in two adjacent habitat types. Annual survival displayed a curvilinear relation to the Southern Oscillation Index, with lower survival during La Niña and El Niño conditions. Although redstart density had no impact on survival, habitat‐specific density influenced local movements between habitat types, with redstarts being less likely to disperse from their previous year's breeding habitat as density within that habitat increased. This finding was strongest in males and may be explained by conspecific attraction influencing settlement decisions. Survival was lowest in young males, but movement was highest in this group, indicating that apparent survival rates were likely biased low due to permanent emigration. Our findings demonstrate the utility of examining breeding dispersal in mark–recapture studies and complement recent work using spatially explicit models of dispersal probability to obtain greater accuracy in survival estimates. John Wiley and Sons Inc. 2015-12-01 /pmc/articles/PMC4717330/ /pubmed/26811763 http://dx.doi.org/10.1002/ece3.1854 Text en © 2015 The Authors. Ecology and Evolution published by John Wiley & Sons Ltd. This is an open access article under the terms of the Creative Commons Attribution (http://creativecommons.org/licenses/by/4.0/) License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
spellingShingle Original Research
McKellar, Ann E.
Reudink, Matthew W.
Marra, Peter P.
Ratcliffe, Laurene M.
Wilson, Scott
Climate and density influence annual survival and movement in a migratory songbird
title Climate and density influence annual survival and movement in a migratory songbird
title_full Climate and density influence annual survival and movement in a migratory songbird
title_fullStr Climate and density influence annual survival and movement in a migratory songbird
title_full_unstemmed Climate and density influence annual survival and movement in a migratory songbird
title_short Climate and density influence annual survival and movement in a migratory songbird
title_sort climate and density influence annual survival and movement in a migratory songbird
topic Original Research
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4717330/
https://www.ncbi.nlm.nih.gov/pubmed/26811763
http://dx.doi.org/10.1002/ece3.1854
work_keys_str_mv AT mckellaranne climateanddensityinfluenceannualsurvivalandmovementinamigratorysongbird
AT reudinkmattheww climateanddensityinfluenceannualsurvivalandmovementinamigratorysongbird
AT marrapeterp climateanddensityinfluenceannualsurvivalandmovementinamigratorysongbird
AT ratcliffelaurenem climateanddensityinfluenceannualsurvivalandmovementinamigratorysongbird
AT wilsonscott climateanddensityinfluenceannualsurvivalandmovementinamigratorysongbird