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title Influence of age and sex on winter site fidelity of sanderlings Calidris alba
authors Lourenco, PM; Alves, JA; Reneerkens, J; Loonstra, AHJ; Potts, PM; Granadeiro, JP; Catry, T
author full name Lourenco, Pedro M.; Alves, Jose A.; Reneerkens, Jeroen; Loonstra, A. H. Jelle; Potts, Peter M.; Granadeiro, Jose P.; Catry, Teresa
title Influence of age and sex on winter site fidelity of sanderlings Calidris alba
nationality internacional
source PEERJ
language English
document type Article
author keywords Site fidelity; Shorebirds; Estuaries; Sex; Age; Movement; Distance; Winter; Foraging areas
keywords plus LONG-DISTANCE DISPERSAL; FRANCISCO BAY ESTUARY; BREEDING DISPERSAL; SPRING MIGRATION; RED KNOTS; BIRDS; PHILOPATRY; MOVEMENTS; ENGLAND; ALPINA
abstract Many migratory bird species show high levels of site fidelity to their wintering sites, which confers advantages due to prior knowledge, but may also limit the ability of the individual to move away from degrading sites or to detect alternative foraging opportunities. Winter site fidelity often varies among age groups, but sexual differences have seldom been recorded in birds. We studied a population of individually colour-marked sanderlings wintering in and around the Tejo estuary, a large estuarine wetland on the western coast of Portugal. For 160 individuals, sighted a total of 1,249 times between November 2009 and March 2013, we calculated the probability that they moved among five distinct wintering sites and how this probability is affected by distance between them. To compare site fidelity among age classes and sexes, as well as within the same winter and over multiple winters, we used a Site Fidelity Index (SFI). Birds were sexed using a discriminant function based on biometrics of a large set of molecularly sexed sanderlings (n=990). The vast majority of birds were observed at one site only, and the probability of the few detected movements between sites was negatively correlated with the distance among each pair of sites. Hardly any movements were recorded over more than 15 km, suggesting small home ranges. SFI values indicated that juveniles were less site-faithful than adults which may reflect the accumulated knowledge and/or dominance of older animals. Among adults, females were significantly less site faithful than males. A sexual difference in winter site fidelity is unusual in shorebirds. SFI values show site-faithfulness is lower when multiple winters were considered, and most birds seem to chose a wintering site early in the season and use that site throughout the winter. Sanderlings show a very limited tendency to explore alternative wintering options, which might have implications for their survival when facing habitat change or loss (e.g., like severe beach erosion as can be the case at one of the study sites).
author address [Lourenco, Pedro M.; Granadeiro, Jose P.; Catry, Teresa] Univ Lisbon, Fac Ciencias, Dept Biol Anim, Ctr Estudos Ambiente & Mar CESAM, Lisbon, Portugal; [Alves, Jose A.] Univ Aveiro, Ctr Estudos Ambiente & Mar CESAM, Aveiro, Portugal; [Alves, Jose A.] Univ Iceland, South Iceland Res Ctr, Selfoss, Iceland; [Reneerkens, Jeroen; Loonstra, A. H. Jelle] Univ Groningen, Conservat Ecol Grp, Groningen Inst Evolutionary Life Sci GELIFES, Groningen, Netherlands; [Potts, Peter M.] Farlington Ringing Grp, Southampton, Hants, England
reprint address Lourenco, PM (reprint author), Univ Lisbon, Fac Ciencias, Dept Biol Anim, Ctr Estudos Ambiente & Mar CESAM, Lisbon, Portugal.
e-mail address p.m.g.lourenco@gmail.com
funding agency and grant number Fundacao para a Ciencia e Tecnologia [SFRH/BPD/84237/2012, SFRH/BPD/102255/2014, SFRH/BPD/91527/2012]; FCT/MEC through national funds [UID/AMB/50017]; FEDER within the PT2020 Partnership Agreement and Compete 2020; Waddenfonds (project Metawad) [WF-209925]
funding text Pedro M. Lourenco (SFRH/BPD/84237/2012), Teresa Catry (SFRH/BPD/102255/2014) and Jose A. Alves (SFRH/BPD/91527/2012) benefited from post-doctoral grants from Fundacao para a Ciencia e Tecnologia. We received 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. Jeroen Reneerkens was financially supported by Waddenfonds (project Metawad, WF-209925). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.
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cited reference count 62
publisher PEERJ INC
publisher city LONDON
publisher address 341-345 OLD ST, THIRD FLR, LONDON, EC1V 9LL, ENGLAND
issn 2167-8359
29-character source abbreviation PEERJ
iso source abbreviation PeerJ
publication date SEP 28
year published 2016
volume 4
article number e2517
digital object identifier (doi) 10.7717/peerj.2517
page count 18
web of science category Multidisciplinary Sciences
subject category Science & Technology - Other Topics
document delivery number DZ1AI
unique article identifier WOS:000385570500010
link http://dx.doi.org/10.7717/peerj.2517