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Yearling proportion correlates with habitat structure in a boreal forest landbird community
Landbird vital rates, such as productivity and adult survivorship, can be estimated by modeling mist-netting capture data. The proportion in which an adult breeding bird is 1 year of age (a “yearling”), however, has been studied only minimally in a few landbird species. Here we relate yearling propo...
Autores principales: | , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
PeerJ Inc.
2020
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7185041/ https://www.ncbi.nlm.nih.gov/pubmed/32355574 http://dx.doi.org/10.7717/peerj.8898 |
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author | Pyle, Peter Foster, Kenneth R. Godwin, Christine M. Kaschube, Danielle R. Saracco, James F. |
author_facet | Pyle, Peter Foster, Kenneth R. Godwin, Christine M. Kaschube, Danielle R. Saracco, James F. |
author_sort | Pyle, Peter |
collection | PubMed |
description | Landbird vital rates, such as productivity and adult survivorship, can be estimated by modeling mist-netting capture data. The proportion in which an adult breeding bird is 1 year of age (a “yearling”), however, has been studied only minimally in a few landbird species. Here we relate yearling proportion to habitat-structure covariates, including reclamation age, in a boreal forest landbird community. Data were collected at 35 constant-effort mist-netting stations over a 6-year period, and consisted of 12,714 captures of adults, of 29 landbird species, including 4,943 captures of yearlings. Accuracy of age determination (yearling or older) was assessed based on recapture data and error rates were estimated at a mean of 8.1% (range 0.0–19.4%) among the 29 species, with 20 species showing age-error rates <10%. The estimated mean yearling proportion was 0.407, ranging from 0.178 to 0.613 among species. Remote-sensed Enhanced Vegetation Index (EVI), a measure of habitat greenness, was positively correlated with age since reclamation up to 20 years, at which time it became comparable to that of natural stations. The probability of capturing a yearling for species associated with mature forest was lower at stations with higher EVI and the opposite was the case for species favoring successional habitats. These results suggest that yearling birds are being excluded from preferred breeding habitats by older birds through despotism and/or that yearlings are simply selecting poorer habitat due to lack of breeding experience or other factors. This dynamic appears to be operating in multiple species within this forest landbird community. Captured yearlings may also be “floaters”, or non-breeding individuals not holding territories. However, presuming that yearlings show lower reproductive success whether floating or not, our results suggest that stations with high yearling proportions could be located within sink as opposed to source habitats. Overall, we infer that yearling proportion may become an important vital-rate measure of habitat quality and reclamation efforts, when combined with indices of population size, productivity, reproductive condition and survivorship. |
format | Online Article Text |
id | pubmed-7185041 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2020 |
publisher | PeerJ Inc. |
record_format | MEDLINE/PubMed |
spelling | pubmed-71850412020-04-30 Yearling proportion correlates with habitat structure in a boreal forest landbird community Pyle, Peter Foster, Kenneth R. Godwin, Christine M. Kaschube, Danielle R. Saracco, James F. PeerJ Ecology Landbird vital rates, such as productivity and adult survivorship, can be estimated by modeling mist-netting capture data. The proportion in which an adult breeding bird is 1 year of age (a “yearling”), however, has been studied only minimally in a few landbird species. Here we relate yearling proportion to habitat-structure covariates, including reclamation age, in a boreal forest landbird community. Data were collected at 35 constant-effort mist-netting stations over a 6-year period, and consisted of 12,714 captures of adults, of 29 landbird species, including 4,943 captures of yearlings. Accuracy of age determination (yearling or older) was assessed based on recapture data and error rates were estimated at a mean of 8.1% (range 0.0–19.4%) among the 29 species, with 20 species showing age-error rates <10%. The estimated mean yearling proportion was 0.407, ranging from 0.178 to 0.613 among species. Remote-sensed Enhanced Vegetation Index (EVI), a measure of habitat greenness, was positively correlated with age since reclamation up to 20 years, at which time it became comparable to that of natural stations. The probability of capturing a yearling for species associated with mature forest was lower at stations with higher EVI and the opposite was the case for species favoring successional habitats. These results suggest that yearling birds are being excluded from preferred breeding habitats by older birds through despotism and/or that yearlings are simply selecting poorer habitat due to lack of breeding experience or other factors. This dynamic appears to be operating in multiple species within this forest landbird community. Captured yearlings may also be “floaters”, or non-breeding individuals not holding territories. However, presuming that yearlings show lower reproductive success whether floating or not, our results suggest that stations with high yearling proportions could be located within sink as opposed to source habitats. Overall, we infer that yearling proportion may become an important vital-rate measure of habitat quality and reclamation efforts, when combined with indices of population size, productivity, reproductive condition and survivorship. PeerJ Inc. 2020-04-24 /pmc/articles/PMC7185041/ /pubmed/32355574 http://dx.doi.org/10.7717/peerj.8898 Text en © 2020 Pyle et al. https://creativecommons.org/licenses/by/4.0/ This is an open access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, reproduction and adaptation in any medium and for any purpose provided that it is properly attributed. For attribution, the original author(s), title, publication source (PeerJ) and either DOI or URL of the article must be cited. |
spellingShingle | Ecology Pyle, Peter Foster, Kenneth R. Godwin, Christine M. Kaschube, Danielle R. Saracco, James F. Yearling proportion correlates with habitat structure in a boreal forest landbird community |
title | Yearling proportion correlates with habitat structure in a boreal forest landbird community |
title_full | Yearling proportion correlates with habitat structure in a boreal forest landbird community |
title_fullStr | Yearling proportion correlates with habitat structure in a boreal forest landbird community |
title_full_unstemmed | Yearling proportion correlates with habitat structure in a boreal forest landbird community |
title_short | Yearling proportion correlates with habitat structure in a boreal forest landbird community |
title_sort | yearling proportion correlates with habitat structure in a boreal forest landbird community |
topic | Ecology |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7185041/ https://www.ncbi.nlm.nih.gov/pubmed/32355574 http://dx.doi.org/10.7717/peerj.8898 |
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