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Advances in the aquatic sciences
RESEARCH ARTICLE

Artificial irrigation ponds and sea coast as foraging habitat for larids breeding in protected wetlands

Esther Sebastián-González A B E , Francisco Botella A , Otso Ovaskainen C , Antonio Delgado D and José Antonio Sánchez-Zapata A
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A Department of Applied Biology, Miguel Hernández University, Avenida de la Universidad s/n, E-03202, Elche, Spain.

B Departamento de Ecologia, Universidade de São Paulo (IB-USP), Rua do Matão 321, Cidade Universitária, CEP 05508-900 São Paulo, Brazil.

C Department of Biosciences, University of Helsinki, PO Box 65 (Viikinkaari 1), FI-00014 The University of Helsinki, Finland.

D Instituto Andaluz de Ciencias de la Tierra (CSIC-UGR), E-18100 Armilla, Granada, Spain.

E Corresponding author. Present address: Biology Department, University of Hawaii, 200 W. Kawili Street, Hilo, HI 96720, USA. Email: esebgo@gmail.com

Marine and Freshwater Research 66(9) 831-840 https://doi.org/10.1071/MF14145
Submitted: 20 February 2014  Accepted: 20 September 2014   Published: 19 March 2015

Abstract

Questions related to the preservation of foraging sites of breeding birds have received little attention, although they can be of major importance for population persistence. Here, we used stable isotopes and field observations to evaluate the relative importance of man-made irrigation ponds as foraging areas for a larid community of conservation concern. We also studied the habitat preferences of the bird species and determined whether pairs of species co-occurred or avoided each other while foraging. Six species used marine habitats preferentially, whereas three species preferred freshwater habitats, the latter being provided mainly by irrigation ponds. Larids foraged preferentially in large and vegetated ponds located close to the breeding areas, and avoided sandy areas at the coast. We propose that the European Union subsidies related to the creation and alteration of irrigation ponds should be linked to management strategies that maximise pond quality for waterbirds. A third of the species pairs examined showed strong support for the species co-occurring more often than expected by random. Our study showed that larids breeding in mixed colonies segregate spatially in their foraging niche between marine and freshwater environments. Both breeding and foraging habitats need to be addressed when analysing larid population dynamics and conservation strategies.

Additional keywords: agriculture, artificial habitat, attraction, co-occurrence, stable isotopes.


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