Provenance does matter: links between winter trophic segregation and the migratory origins of European robins

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Provenance does matter : links between winter trophic segregation and the migratory origins of European robins. / Catry, Paulo; Campos, Ana R.; Granadeiro, José Pedro; Neto, Júlio M.; Ramos, Jaime; Newton, Jason; Bearhop, Stuart.

I: Oecologia, Vol. 182, Nr. 4, 01.12.2016, s. 985-994.

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Catry, Paulo ; Campos, Ana R. ; Granadeiro, José Pedro ; Neto, Júlio M. ; Ramos, Jaime ; Newton, Jason ; Bearhop, Stuart. / Provenance does matter : links between winter trophic segregation and the migratory origins of European robins. I: Oecologia. 2016 ; Vol. 182, Nr. 4. s. 985-994.

RIS

TY - JOUR

T1 - Provenance does matter

T2 - links between winter trophic segregation and the migratory origins of European robins

AU - Catry, Paulo

AU - Campos, Ana R.

AU - Granadeiro, José Pedro

AU - Neto, Júlio M.

AU - Ramos, Jaime

AU - Newton, Jason

AU - Bearhop, Stuart

PY - 2016/12/1

Y1 - 2016/12/1

N2 - Amongst migratory species, it is common to find individuals from different populations or geographical origins sharing staging or wintering areas. Given their differing life histories, ecological theory would predict that the different groups of individuals should exhibit some level of niche segregation. This has rarely been investigated because of the difficulty in assigning migrating individuals to breeding areas. Here, we start by documenting a broad geographical gradient of hydrogen isotopes (δ2H) in robin Erithacus rubecula feathers across Europe. We then use δ2H, as well as wing-tip shape, as surrogates for broad migratory origin of birds wintering in Iberia, to investigate the ecological segregation of populations. Wintering robins of different sexes, ages and body sizes are known to segregate between habitats in Iberia. This has been attributed to the despotic exclusion of inferior competitors from the best patches by dominant individuals. We find no segregation between habitats in relation to δ2H in feathers, or to wing-tip shape, which suggests that no major asymmetries in competitive ability exist between migrant robins of different origins. Trophic level (inferred from nitrogen isotopes in blood) correlated both with δ2H in feathers and with wing-tip shape, showing that individuals from different geographic origins display a degree of ecological segregation in shared winter quarters. Isotopic mixing models indicate that wintering birds originating from more northerly populations consume more invertebrates. Our multi-scale study suggests that trophic-niche segregation may result from specializations (arising in the population-specific breeding areas) that are transported by the migrants into the shared wintering grounds.

AB - Amongst migratory species, it is common to find individuals from different populations or geographical origins sharing staging or wintering areas. Given their differing life histories, ecological theory would predict that the different groups of individuals should exhibit some level of niche segregation. This has rarely been investigated because of the difficulty in assigning migrating individuals to breeding areas. Here, we start by documenting a broad geographical gradient of hydrogen isotopes (δ2H) in robin Erithacus rubecula feathers across Europe. We then use δ2H, as well as wing-tip shape, as surrogates for broad migratory origin of birds wintering in Iberia, to investigate the ecological segregation of populations. Wintering robins of different sexes, ages and body sizes are known to segregate between habitats in Iberia. This has been attributed to the despotic exclusion of inferior competitors from the best patches by dominant individuals. We find no segregation between habitats in relation to δ2H in feathers, or to wing-tip shape, which suggests that no major asymmetries in competitive ability exist between migrant robins of different origins. Trophic level (inferred from nitrogen isotopes in blood) correlated both with δ2H in feathers and with wing-tip shape, showing that individuals from different geographic origins display a degree of ecological segregation in shared winter quarters. Isotopic mixing models indicate that wintering birds originating from more northerly populations consume more invertebrates. Our multi-scale study suggests that trophic-niche segregation may result from specializations (arising in the population-specific breeding areas) that are transported by the migrants into the shared wintering grounds.

KW - Ecological segregation

KW - Erithacus rubecula

KW - Migration

KW - Seasonal matching

KW - Stable isotopes

UR - http://www.scopus.com/inward/record.url?scp=84988354878&partnerID=8YFLogxK

U2 - 10.1007/s00442-016-3725-z

DO - 10.1007/s00442-016-3725-z

M3 - Article

C2 - 27638183

AN - SCOPUS:84988354878

VL - 182

SP - 985

EP - 994

JO - Oecologia

JF - Oecologia

SN - 0029-8519

IS - 4

ER -