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Drivers of demographic decline across the annual cycle of a threatened migratory bird.
Wilson, Scott; Saracco, James F; Krikun, Richard; Flockhart, D T Tyler; Godwin, Christine M; Foster, Kenneth R.
Afiliação
  • Wilson S; Wildlife Research Division, Environment Canada, National Wildlife Research Centre, 1125 Colonel by Drive, Ottawa, ON, K1A 0H3, Canada. scott.wilson@canada.ca.
  • Saracco JF; The Institute for Bird Populations, PO Box 1346, Point Reyes Station, CA, 94956, USA.
  • Krikun R; Lesser Slave Lake Bird Observatory, Box 1076, Slave Lake, AB, T0G2A0, Canada.
  • Flockhart DTT; Lesser Slave Lake Bird Observatory, Box 1076, Slave Lake, AB, T0G2A0, Canada.
  • Godwin CM; University of Maryland Center for Environmental Science, Appalachian Laboratory, 301 Braddock Road, Frostburg, MD, 21532, USA.
  • Foster KR; Owl Moon Environmental Inc., 324 Killdeer Way, Fort McMurray, Alberta, T9K 0R3, Canada.
Sci Rep ; 8(1): 7316, 2018 05 09.
Article em En | MEDLINE | ID: mdl-29743651
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.
Assuntos

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Espécies em Perigo de Extinção / Migração Animal / Passeriformes Limite: Animals Idioma: En Ano de publicação: 2018 Tipo de documento: Article

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Espécies em Perigo de Extinção / Migração Animal / Passeriformes Limite: Animals Idioma: En Ano de publicação: 2018 Tipo de documento: Article