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Migratory connectivity in a declining bird species: using feather isotopes to inform demographic modelling

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Abstract:

Abstract Aim 

Conservation programmes for endangered migratory species or populations require locating and evaluating breeding, stopover and wintering areas. We used multiple stable isotopes in two endangered European populations of wrynecks, Jynx torquilla L., to locate wintering regions and assess the degree of migratory connectivity between breeding and wintering populations. Location 

Switzerland and Germany. Methods 

We analysed stable nitrogen (δ15N), carbon (δ13C) and hydrogen (δD) isotopes from wing feathers from two populations of wrynecks to infer their wintering origins and to assess the strength of migratory connectivity. We tested whether variation in feather isotopic values within the Swiss population was affected by bird age and collection year and then considered differences in isotopic values between the two breeding populations. We used isotopic values of summer- and winter-grown feathers to estimate seasonal distributions. Finally, we calculated a species-specific δD discrimination factor between feathers and mean annual δD values to assign winter-grown feathers to origin. Results 

Bird age and collection year caused substantial isotopic variation in winter-grown feathers, which may be because of annually variable weather conditions, movements of birds among wintering sites and/or reflect asynchronous moulting or selection pressure. The large isotopic variance in winter-grown feathers nevertheless suggested low migratory connectivity for each breeding population, with partially overlapping wintering regions for the two populations. Main conclusions 

Isotopic variance in winter-grown feathers of two breeding populations of wrynecks and their geographical assignment point to defined, albeit overlapping, wintering areas, suggesting both leapfrog migration and low migratory connectivity. On this basis, integrative demographic models can be built looking at seasonal survival patterns with links to local environmental conditions on both breeding and wintering grounds, which may elucidate causes of declines in migratory bird species.

Keywords: Africa; Jynx torquilla; annual climatic variation; isotopic variation (carbon-13, nitrogen-15, deuterium); leapfrog migration; long-distance migrant; species conservation

Document Type: Research Article

DOI: https://doi.org/10.1111/j.1472-4642.2010.00664.x

Affiliations: 1: Environment Canada, 11 Innovation Blvd., Saskatoon, SK, Canada 2: Menckestrasse 34, D-04155 Leipzig, Germany 3: Museum Heineanum, Domplatz 36, D-38820 Halberstadt, Germany 4: Swiss Ornithological Institute, CH-6204 Sempach, Switzerland

Publication date: 2010-07-01

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