How do Robins Erithacus rubecula resident in Iberia respond to seasonal flooding by conspectific migrants?

Campos, A.R., Catry, P., Teneiro, P., Neto, J.M., Pereira, A.C., Brito, R., Cardoso, H., Ramos, J.A., Bearhop, S. and Newton, J. (2011) How do Robins Erithacus rubecula resident in Iberia respond to seasonal flooding by conspectific migrants? Bird Study, 58(4), pp. 435-442. (doi:10.1080/00063657.2011.603291)

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Abstract

Capsule: The majority of Robins in Iberia are sedentary and stay in their nesting areas despite the presumed increased competition that results from the seasonal flooding of the area by conspecific migrants.

Aims: To evaluate if Robins in Iberia are displaced from their nesting areas by the presence of large numbers of competitors originating from higher latitudes.

Methods: Data from constant effort ringing sites were used to estimate the proportion of Robins that are strictly sedentary and the seasonal variation in Robin numbers. Hydrogen stable isotope ratios (δ2H) in feathers, and sex ratios determined through molecular techniques, allowed an insight into the numerical importance of invading Robins from higher latitudes.

Results: Robins were more numerous outside the breeding season, with clear influxes in autumn. Around half of the locally nesting Robins were captured during winter, indicating they are truly sedentary. δ2H in feathers suggests that a wide mixture of Robins from all European latitudes were present in winter, and these data, together with sex ratios, suggest that there may be similar numbers of local and foreign individuals in winter at the main study site.

Conclusion: Despite the occupation of their range by migrants, local birds are largely sedentary.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Newton, Dr Jason
Authors: Campos, A.R., Catry, P., Teneiro, P., Neto, J.M., Pereira, A.C., Brito, R., Cardoso, H., Ramos, J.A., Bearhop, S., and Newton, J.
College/School:College of Science and Engineering > Scottish Universities Environmental Research Centre
Journal Name:Bird Study
ISSN:0006-3657
Published Online:12 August 2011

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