Urban residency and leukocyte profiles in a traditionally migratory songbird

Many animals are shifting migrations in response to human activities. In particular, human-induced changes to climate and habitat (e.g., urbanization) likely facilitate animals becoming year-round residents. Because migration can be energetically expensive, shifts to sedentary behavior could minimiz...

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Autores principales:	Becker Daniel J., Schultz Elizabeth M., Atwell Jonathan W., Ketterson Ellen D.
Formato:	article
Lenguaje:	EN
Publicado:	De Gruyter 2019
Materias:	white blood cells hl ratios ecoimmunology altitudinal migration junco hyemalis urbanization anthropogenic resources Biology (General) QH301-705.5
Acceso en línea:	https://doaj.org/article/d71429b9948d4d82bc805a796f059a23
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spelling	oai:doaj.org-article:d71429b9948d4d82bc805a796f059a232021-12-02T17:31:50ZUrban residency and leukocyte profiles in a traditionally migratory songbird2084-883810.1515/ami-2019-0002https://doaj.org/article/d71429b9948d4d82bc805a796f059a232019-12-01T00:00:00Zhttps://doi.org/10.1515/ami-2019-0002https://doaj.org/toc/2084-8838Many animals are shifting migrations in response to human activities. In particular, human-induced changes to climate and habitat (e.g., urbanization) likely facilitate animals becoming year-round residents. Because migration can be energetically expensive, shifts to sedentary behavior could minimize energetic demands incurred and any immunosuppressive effects. Residency in urban habitats could also provide abundant resources and allow sedentary animals to invest more in immunity. However, urban habitats could also expose sedentary animals to novel stressors that counter such benefits. To examine how recent shifts to residency affects physiology in ways that may shape infectious disease dynamics, we analyzed leukocyte profiles of two dark-eyed junco (Junco hyemalis) populations from southern California: the Laguna Mountain population, in which birds breed in high-elevation forests and migrate altitudinally, and the urban University of California San Diego population, which was likely established by overwintering migrants in the 1980s and has since become non-migratory. Over a two-year study of each population’s breeding season, we found no difference in the ratios of heterophils to lymphocytes between populations. However, urban residents had more leukocytes than birds from the altitudinal migrant population. A multivariate analysis suggested urban residents had fewer monocytes, but effect sizes were small. These results suggest no differences in energy demands or stressors between urban resident and altitudinal migrant populations during their breeding season. However, urban residency may confer immunological benefits through anthropogenic resources, which could have important consequences for disease dynamics..Becker Daniel J.Schultz Elizabeth M.Atwell Jonathan W.Ketterson Ellen D.De Gruyterarticlewhite blood cellshl ratiosecoimmunologyaltitudinal migrationjunco hyemalisurbanizationanthropogenic resourcesBiology (General)QH301-705.5ENAnimal Migration, Vol 6, Iss 1, Pp 49-59 (2019)
institution	DOAJ
collection	DOAJ
language	EN
topic	white blood cells hl ratios ecoimmunology altitudinal migration junco hyemalis urbanization anthropogenic resources Biology (General) QH301-705.5
spellingShingle	white blood cells hl ratios ecoimmunology altitudinal migration junco hyemalis urbanization anthropogenic resources Biology (General) QH301-705.5 Becker Daniel J. Schultz Elizabeth M. Atwell Jonathan W. Ketterson Ellen D. Urban residency and leukocyte profiles in a traditionally migratory songbird
description	Many animals are shifting migrations in response to human activities. In particular, human-induced changes to climate and habitat (e.g., urbanization) likely facilitate animals becoming year-round residents. Because migration can be energetically expensive, shifts to sedentary behavior could minimize energetic demands incurred and any immunosuppressive effects. Residency in urban habitats could also provide abundant resources and allow sedentary animals to invest more in immunity. However, urban habitats could also expose sedentary animals to novel stressors that counter such benefits. To examine how recent shifts to residency affects physiology in ways that may shape infectious disease dynamics, we analyzed leukocyte profiles of two dark-eyed junco (Junco hyemalis) populations from southern California: the Laguna Mountain population, in which birds breed in high-elevation forests and migrate altitudinally, and the urban University of California San Diego population, which was likely established by overwintering migrants in the 1980s and has since become non-migratory. Over a two-year study of each population’s breeding season, we found no difference in the ratios of heterophils to lymphocytes between populations. However, urban residents had more leukocytes than birds from the altitudinal migrant population. A multivariate analysis suggested urban residents had fewer monocytes, but effect sizes were small. These results suggest no differences in energy demands or stressors between urban resident and altitudinal migrant populations during their breeding season. However, urban residency may confer immunological benefits through anthropogenic resources, which could have important consequences for disease dynamics..
format	article
author	Becker Daniel J. Schultz Elizabeth M. Atwell Jonathan W. Ketterson Ellen D.
author_facet	Becker Daniel J. Schultz Elizabeth M. Atwell Jonathan W. Ketterson Ellen D.
author_sort	Becker Daniel J.
title	Urban residency and leukocyte profiles in a traditionally migratory songbird
title_short	Urban residency and leukocyte profiles in a traditionally migratory songbird
title_full	Urban residency and leukocyte profiles in a traditionally migratory songbird
title_fullStr	Urban residency and leukocyte profiles in a traditionally migratory songbird
title_full_unstemmed	Urban residency and leukocyte profiles in a traditionally migratory songbird
title_sort	urban residency and leukocyte profiles in a traditionally migratory songbird
publisher	De Gruyter
publishDate	2019
url	https://doaj.org/article/d71429b9948d4d82bc805a796f059a23
work_keys_str_mv	AT beckerdanielj urbanresidencyandleukocyteprofilesinatraditionallymigratorysongbird AT schultzelizabethm urbanresidencyandleukocyteprofilesinatraditionallymigratorysongbird AT atwelljonathanw urbanresidencyandleukocyteprofilesinatraditionallymigratorysongbird AT kettersonellend urbanresidencyandleukocyteprofilesinatraditionallymigratorysongbird
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Urban residency and leukocyte profiles in a traditionally migratory songbird

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