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title Foraging ecology of sanderlings Calidris alba wintering in estuarine and non-estuarine intertidal areas
authors Lourenco, PM; Alves, JA; Catry, T; Granadeiro, JP
author full name Lourenco, Pedro M.; Alves, Jose A.; Catry, Teresa; Granadeiro, Jose P.
title Foraging ecology of sanderlings Calidris alba wintering in estuarine and non-estuarine intertidal areas
nationality internacional
source JOURNAL OF SEA RESEARCH
language English
document type Article
author keywords Diet; Intake rate; Macroinvertebrates; Prey availability; Substrate; Shorebirds
keywords plus SEA-LEVEL RISE; WADDEN SEA; ENVIRONMENTAL-FACTORS; ENERGY-EXPENDITURE; SANDY BEACHES; DELAWARE BAY; HABITAT USE; RED KNOTS; WADERS; SHOREBIRDS
abstract Outside the breeding season, most shorebirds use either estuarine or non-estuarine intertidal areas as foraging grounds. The sanderling Calidris alba is mostly associated with coastal sandy beaches, a habitat which is currently at risk worldwide due to increasing coastal erosion, but may also use estuarine sites as alternative foraging areas. We aimed to compare the trophic conditions for sanderlings wintering in estuarine and non-estuarine sites within and around the Tejo estuary, Portugal, where these two alternative wintering options are available within a relatively small spatial scale. To achieve this, we analysed sanderling diet, prey availability, foraging behaviour, and time and energy budgets in the different substrates available in estuarine and non-estuarine sites. In terms of biomass, the most important sanderling prey in the estuarine sites were siphons of the bivalve Scrobicularia plane, polychaetes, staphylinids and the gastropod Hydrobia ulvae. In non-estuarine sites the main prey were polychaetes, the bivalve Donax trunculus and chironomid larvae. Both food availability and energetic intake rates were higher on estuarine sites, and sanderlings spent a higher proportion of time foraging on non-estuarine sites. In the estuary, sanderlings foraged in muddy-sand substrate whenever it was available, achieving higher intake rates than in sandy substrates. In the non-estuarine sites they used both sandy and rocky substrates throughout the tidal cycle but had higher intakes rates in sandy substrate. Estuarine sites seem to offer better foraging conditions for wintering sanderlings than non-estuarine sites. However, sanderlings only use muddy-sand and sandy substrates, which represent a small proportion of the intertidal area of the estuary. The extent of these substrates and the current sanderling density in the estuary suggest it is unlikely that the estuary could provide alternative wintering habitat for sanderlings if they face habitat loss and degradation in coastal sites. (C) 2015 Elsevier B.V. All rights reserved.
author address [Lourenco, Pedro M.; Catry, Teresa] Univ Lisbon, Museu Nacl Hist Nat & Ciencia, Ctr Estudos Ambiente & Mar CESAM, P-1250102 Lisbon, Portugal; [Alves, Jose A.] Univ Aveiro, Ctr Estudos Ambiente & Mar CESAM, P-3810193 Aveiro, Portugal; [Alves, Jose A.] Univ Iceland, South Iceland Res Ctr, IS-800 Fjolheimar, Selfoss, Iceland; [Granadeiro, Jose P.] Univ Lisbon, Fac Ciencias, Ctr Estudos Ambiente & Mar CESAM, P-1749016 Lisbon, Portugal
reprint address Lourenco, PM (reprint author), Univ Lisbon, Museu Nacl Hist Nat & Ciencia, Ctr Estudos Ambiente & Mar CESAM, Rua Escola Politecn 58, P-1250102 Lisbon, Portugal.
e-mail address p.m.g.lourenco@gmail.com
funding agency and grant number Fundacao para a Ciencia e Tecnologia (FCT) [PTDC/MAR/119920/2010, SFRH/BPD/84237/2012, SFRH/BPD/91527/2012, SFRH/BPD/102255/2014]
funding text We would like to thank Camilo Carneiro and Ana Catarina Goncalves for their help in sorting invertebrate samples, and Gilda Silva and Henrique Cabral for allowing us to use the facilities of the Centro de Oceanografia of the Faculty of Sciences of the University of Lisbon to analyse invertebrate biomass content. The authors were funded by Fundacao para a Ciencia e Tecnologia (FCT) through Project
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cited reference count 57
publisher ELSEVIER SCIENCE BV
publisher city AMSTERDAM
publisher address PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
issn 1385-1101
29-character source abbreviation J SEA RES
iso source abbreviation J. Sea Res.
publication date OCT
year published 2015
volume 104
beginning page 33
ending page 40
digital object identifier (doi) 10.1016/j.seares.2015.06.013
page count 8
web of science category Marine & Freshwater Biology; Oceanography
subject category Marine & Freshwater Biology; Oceanography
document delivery number CT2GG
unique article identifier WOS:000362619400004
link http://dx.doi.org/10.1016/j.seares.2015.06.013