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Dispersal of little egrets Egretta garzetta from northern Spanish Atlantic colonies

Citation

Galarza, A and Arce, F and Navedo, JG and Arizaga, J, Dispersal of little egrets Egretta garzetta from northern Spanish Atlantic colonies, Ardeola, 63, (2) pp. 375-382. ISSN 0570-7358 (2016) [Refereed Article]


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DOI: doi:10.13157/arla.63.2.2016.sc4

Abstract

We studied the movements of little egrets Egretta garzetta from breeding colonies in northern Spanish Atlantic estuaries using sighting data of colour-ringed birds. Data on 304 resightings of 95 out of 457 little egrets ringed as chicks in two colonies on the southern Bay of Biscay were analysed. Most egrets (68.9%) were observed less than 50 km from their natal colonies and thus exhibited low dispersal, supporting the view that these birds belong to a resident population breeding along the coasts of the Bay of Biscay. Nearly all resightings (95.5%) occurred in estuaries across an east-west axis corresponding to the Atlantic coast of northern Spain and had a west-biased dispersal direction. We suggest that the recently formed northern Atlantic Spanish population is a consequence of a westward colonisation pattern originating in the French Atlantic colonies.

Item Details

Item Type:Refereed Article
Keywords:estuaries, herons, Iberian Peninsula, natal dispersal, waterbirds
Research Division:Biological Sciences
Research Group:Ecology
Research Field:Community Ecology
Objective Division:Environment
Objective Group:Flora, Fauna and Biodiversity
Objective Field:Coastal and Estuarine Flora, Fauna and Biodiversity
Author:Arce, F (Mr Fernando Arce Gonzalez)
ID Code:114351
Year Published:2016
Deposited By:Centre for Ecology and Biodiversity
Deposited On:2017-02-14
Last Modified:2017-02-21
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