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1 July 2017 Stable Isotope Analysis Reveals Biases in the Performance of a Morphological Method to Distinguish the Migratory Behaviour of European Robins Erithacus Rubecula
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Abstract

Morphological methods to distinguish between avian groups of research interest (e.g. different sexes, populations or cryptic species) need to be externally validated to ensure reliable performance across situations. In this study, we used stable hydrogen isotope ratios of feathers (δ2Hf) to test the validity of morphological classification functions (MCFs) previously designed to assess the migratory behaviour of European Robins Erithacus rubecula wintering in southern Iberia. Our results show that a great number of migrants (mostly females and juveniles) were erroneously assigned as sedentary, which could compromise the reliability of previous ecological studies that made use of these MCFs. The development of improved MCFs or the use of alternative differentiation methods (δ2Hf) could help us to gain a more realistic insight into the habitat distribution and ecological interactions of sympatric migratory and sedentary robins overwintering in southern Iberia.

Iván De la Hera, Guillermo Fandos, Javier Fernández-López, Alejandro Onrubia, Antón Pérez-Rodríguez, Javier Pérez-Tris, and José Luis Tellería "Stable Isotope Analysis Reveals Biases in the Performance of a Morphological Method to Distinguish the Migratory Behaviour of European Robins Erithacus Rubecula," Ardeola 64(2), 377-386, (1 July 2017). https://doi.org/10.13157/arla.64.2.2017.sc1
Received: 22 November 2016; Accepted: 1 February 2017; Published: 1 July 2017
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