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title Diet and feeding ecology of the wintering shorebird assemblage in the Bijagos archipelago, Guinea-Bissau
authors Lourenco, PM; Catry, T; Granadeiro, JP
author full name Lourenco, Pedro M.; Catry, Teresa; Granadeiro, Jose P.
title Diet and feeding ecology of the wintering shorebird assemblage in the Bijagos archipelago, Guinea-Bissau
nationality internacional
source JOURNAL OF SEA RESEARCH
language English
document type Article
author keywords Diet overlap; Niche width; Resource partitioning; Foraging behaviour
keywords plus BAR-TAILED GODWITS; PLUVIALIS-SQUATAROLA; FORAGING STRATEGIES; NUMENIUS-PHAEOPUS; INTERTIDAL FLATS; HABITAT USE; WADDEN SEA; WADERS; BEHAVIOR; NICHE
abstract Detailed data on shorebird feeding ecology is mostly lacking for tropical wintering sites, limiting our understanding of trophic interactions among shorebird species and their prey. Using dropping analysis and video recordings we compared the diet of eight shorebird species wintering in the Bijagos archipelago, Guinea-Bissau, one of the most important but also least known coastal sites for shorebirds in Africa. We also calculated niche width and foraging niche overlap among these eight species. Whimbrel, grey plover and redshank fed mainly on fiddler crabs, confirming previous observations made in the Bijagos. A large proportion of the diet of bar-tailed godwit, curlew sandpiper, sanderling and ringed plover was composed of polychaetes, particularly Nereis and Glycera, and also Marphysa in the case of larger shorebirds. Red knots fed mainly on the bivalve Dosinia isocardia. All species showed narrow trophic niches, but particularly so whimbrel, red knot, grey plover and redshank. Niche overlap among shorebird species was mostly insignificant, with the exception of species that fed mainly on fiddler crab. Low levels of niche overlap suggest that shorebirds are able to partition the available food resources in the Bijagos despite the reported low macrobenthic densities in the area. In fact, observational data for bar-tailed godwit suggests resource partitioning even occurs within species, with dietary differences among sexes.
author address [Lourenco, Pedro M.; Catry, Teresa; Granadeiro, Jose P.] Univ Lisbon, Fac Ciencias, Dept Biol Anim, Ctr Estudos Ambiente & Mar CESAM, P-1749016 Lisbon, Portugal
reprint address Lourenco, PM (reprint author), Univ Lisbon, Fac Ciencias, Dept Biol Anim, Ctr Estudos Ambiente & Mar CESAM, P-1749016 Lisbon, Portugal.
e-mail address p.m.g.lourenco@gmail.com
orcid number Lourenco, Pedro Miguel/0000-0003-2158-3199; Catry, Teresa/0000-0003-4047-9995; Granadeiro, Jose Pedro/0000-0002-7207-3474
funding agency and grant number Fundacao para a Ciencia e Tecnologia (FCT) [SFRH/BPD/84237/2012]; CESAM [UID/AMB/50017]; FCT/MEC; FEDER, within the PT Partnership Agreement and Compete
funding text We thank Alfredo da Silva, Aissa Regalia, Quintino Tchantchalam, Santinho da Silva and other staff from IBAP, as well as Jodozinho Sa and Hamilton Monteiro (GPC), for their help and permission to work in Guinea-Bissau. Paulo Catry provided advice on Bijagos during expedition's preparation. Jose Alves, Camilo Carneiro, Ines Catty, Maria Dias, Mohamed Henriques and Miguel Lecoq provided invaluable during our field campaigns in the Bijagos. Two anonymous reviewers provided several useful comments to an earlier version of the manuscript. This study was supported by Fundacao para a Ciencia e Tecnologia (FCT) through a postdoctoral grant to PML (SFRH/BPD/84237/2012). Thanks are also due, for the financial support to CESAM (UID/AMB/50017), from FCT/MEC through national funds, and the co-funding by the FEDER, within the PT2020 Partnership Agreement and Compete 2020.
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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 2017
volume 128
beginning page 52
ending page 60
digital object identifier (doi) 10.1016/j.seares.2017.08.004
subject category 9
document delivery number Marine & Freshwater Biology; Oceanography
unique article identifier Marine & Freshwater Biology; Oceanography