Drivers of demographic decline across the annual cycle of a threatened migratory bird

Abstract Migratory species are rapidly declining but we rarely know which periods of the annual cycle are limiting for most species. This knowledge is needed to effectively allocate conservation resources to the periods of the annual cycle that best promote species recovery. We examined demographic...

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Autores principales:	Scott Wilson, James F. Saracco, Richard Krikun, D. T. Tyler Flockhart, Christine M. Godwin, Kenneth R. Foster
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2018
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/583d4edc1cef49f29af95f9e6473f203
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spelling	oai:doaj.org-article:583d4edc1cef49f29af95f9e6473f2032021-12-02T11:41:03ZDrivers of demographic decline across the annual cycle of a threatened migratory bird10.1038/s41598-018-25633-z2045-2322https://doaj.org/article/583d4edc1cef49f29af95f9e6473f2032018-05-01T00:00:00Zhttps://doi.org/10.1038/s41598-018-25633-zhttps://doaj.org/toc/2045-2322Abstract Migratory species are rapidly declining but we rarely know which periods of the annual cycle are limiting for most species. This knowledge is needed to effectively allocate conservation resources to the periods of the annual cycle that best promote species recovery. We examined demographic trends and response to human footprint for Canada warblers (Cardellina canadensis), a threatened Neotropical migrant, using range-wide data (1993–2016) from the Monitoring Avian Productivity and Survivorship (MAPS) program on the breeding grounds. Declines in abundance were steepest in the eastern breeding region, followed by the western region. Breeding productivity did not decline in any region. In contrast, we observed declining recruitment in all regions, low apparent survival in the east and west, and a decline in apparent survival in the east. Abundance declined with increasing disturbance around MAPS stations. Between 1993 and 2009, the human footprint index on the breeding range increased by 0.11% in contrast to a 14% increase on the wintering range. Landscape-scale disturbance on the breeding grounds may influence abundance in some regions; however, the observed trends in demography and footprint suggests limitation during the non-breeding period as the likely driver of overall declines, particularly for eastern populations.Scott WilsonJames F. SaraccoRichard KrikunD. T. Tyler FlockhartChristine M. GodwinKenneth R. FosterNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 8, Iss 1, Pp 1-11 (2018)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Scott Wilson James F. Saracco Richard Krikun D. T. Tyler Flockhart Christine M. Godwin Kenneth R. Foster Drivers of demographic decline across the annual cycle of a threatened migratory bird
description	Abstract Migratory species are rapidly declining but we rarely know which periods of the annual cycle are limiting for most species. This knowledge is needed to effectively allocate conservation resources to the periods of the annual cycle that best promote species recovery. We examined demographic trends and response to human footprint for Canada warblers (Cardellina canadensis), a threatened Neotropical migrant, using range-wide data (1993–2016) from the Monitoring Avian Productivity and Survivorship (MAPS) program on the breeding grounds. Declines in abundance were steepest in the eastern breeding region, followed by the western region. Breeding productivity did not decline in any region. In contrast, we observed declining recruitment in all regions, low apparent survival in the east and west, and a decline in apparent survival in the east. Abundance declined with increasing disturbance around MAPS stations. Between 1993 and 2009, the human footprint index on the breeding range increased by 0.11% in contrast to a 14% increase on the wintering range. Landscape-scale disturbance on the breeding grounds may influence abundance in some regions; however, the observed trends in demography and footprint suggests limitation during the non-breeding period as the likely driver of overall declines, particularly for eastern populations.
format	article
author	Scott Wilson James F. Saracco Richard Krikun D. T. Tyler Flockhart Christine M. Godwin Kenneth R. Foster
author_facet	Scott Wilson James F. Saracco Richard Krikun D. T. Tyler Flockhart Christine M. Godwin Kenneth R. Foster
author_sort	Scott Wilson
title	Drivers of demographic decline across the annual cycle of a threatened migratory bird
title_short	Drivers of demographic decline across the annual cycle of a threatened migratory bird
title_full	Drivers of demographic decline across the annual cycle of a threatened migratory bird
title_fullStr	Drivers of demographic decline across the annual cycle of a threatened migratory bird
title_full_unstemmed	Drivers of demographic decline across the annual cycle of a threatened migratory bird
title_sort	drivers of demographic decline across the annual cycle of a threatened migratory bird
publisher	Nature Portfolio
publishDate	2018
url	https://doaj.org/article/583d4edc1cef49f29af95f9e6473f203
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Drivers of demographic decline across the annual cycle of a threatened migratory bird

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