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title Cephalopods in the diet of nonbreeding black-browed and grey-headed albatrosses from South Georgia
authors Alvito, PM; Rosa, R; Phillips, RA; Cherel, Y; Ceia, F; Guerreiro, M; Seco, J; Baeta, A; Vieira, RP; Xavier, JC
author full name Alvito, Pedro M.; Rosa, Rui; Phillips, Richard A.; Cherel, Yves; Ceia, Filipe; Guerreiro, Miguel; Seco, Jose; Baeta, Alexandra; Vieira, Rui P.; Xavier, Jose C.
title Cephalopods in the diet of nonbreeding black-browed and grey-headed albatrosses from South Georgia
nationality internacional
source POLAR BIOLOGY
language English
document type Article
author keywords Antarctica; Albatrosses; Cephalopods; Thalassarche melanophris; Thalassarche chrysostoma
keywords plus STABLE-ISOTOPE; SYMPATRIC ALBATROSSES; WANDERING ALBATROSSES; INTERANNUAL VARIATION; DIOMEDEA-CHRYSOSTOMA; HABITAT PREFERENCES; STOMACH-CONTENTS; TROPHIC ECOLOGY; FEEDING ECOLOGY; RAMIREZ ISLANDS
abstract The food and feeding ecology of albatrosses during the nonbreeding season is still poorly known, particularly with regard to the cephalopod component. This was studied in black-browed Thalassarche melanophris and grey-headed T. chrysostoma albatrosses by analysing boluses collected shortly after adults returned to colonies at Bird Island, South Georgia (54 degrees S, 38 degrees W), in 2009. Based on stable isotopic analyses of the lower beaks, we determined the habitat and trophic level (from delta C-13 and delta N-15, respectively) of the most important cephalopods and assessed the relative importance of scavenging in terms of the albatrosses' feeding regimes. Based on lower rostral lengths (LRLs), the main cephalopod species in the diets of both albatrosses was Kondakovia longimana, by frequency of occurrence (F>90 %), number (N>40 %) and mass (M>80 %). The large estimated mass of many squid, including K. longimana, suggests that a high proportion (>80 % by mass) was scavenged, and that scavenging is much more important during the nonbreeding season than would be expected from breeding-season diets. The diversity of cephalopods consumed by nonbreeding birds in our study was similar to that recorded during previous breeding seasons, but included two new species [Moroteuthis sp. B (Imber) and ? Mastigoteuthis A (Clarke)]. Based on similarities in LRL, delta C-13 and delta N-15, the squid consumed may have been from the same oceanic populations or region, with the exception of Taonius sp. B (Voss) and K. longimana, which, based on significant differences in delta N-15 values, suggest that they may have originated from different stocks, indicating differences in the albatrosses' feeding regimes.
author address [Alvito, Pedro M.; Ceia, Filipe; Guerreiro, Miguel; Seco, Jose; Baeta, Alexandra; Vieira, Rui P.; Xavier, Jose C.] Univ Coimbra, MARE Marine & Environm Res Ctr, P-3001401 Coimbra, Portugal; [Rosa, Rui] Univ Lisbon, Fac Ciencias, Ctr Oceanog, Lab Maritimo Guia, P-2750374 Cascais, Portugal; [Phillips, Richard A.; Xavier, Jose C.] British Antarctic Survey, Nat Environm Res Council, Cambridge CB3 0ET, England; [Cherel, Yves] Univ La Rochelle, UMR CNRS 7372, Ctr Etud Biol Chize, F-79360 Villiers En Bois, France
reprint address Alvito, PM (reprint author), Univ Coimbra, MARE Marine & Environm Res Ctr, P-3001401 Coimbra, Portugal.
e-mail address pm_alvito@hotmail.com
researcherid number Rosa, Rui/A-4580-2009; Ceia, Filipe/A-2196-2012
orcid number Rosa, Rui/0000-0003-2801-5178; Ceia, Filipe/0000-0002-5470-5183
funding agency and grant number Ministry of Science and Higher Education, Portugal (Fundacao para a Ciencia e a Tecnologia); British Antarctic Survey; Tinker Foundation; Natural Environment Research Council
funding text We are grateful to Derren Fox, Stacey Adlard and Ewan Edwards at Bird Island research station for helping with sample collection in winter 2009, and Janet Silk for creating Fig. 1. This research was supported by the Ministry of Science and Higher Education, Portugal (Fundacao para a Ciencia e a Tecnologia), the British Antarctic Survey and the Tinker Foundation, under the research programs CEPH, SCAR AnT-ERA, PROPOLAR and ICED. This study represents a contribution to the Ecosystems component of the British Antarctic Survey Polar Science for Planet Earth Programme, funded by The Natural Environment Research Council.
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cited reference count 52
times cited 2
total times cited count (wos, bci, and cscd) 2
publisher SPRINGER
publisher city NEW YORK
publisher address 233 SPRING ST, NEW YORK, NY 10013 USA
issn 0722-4060
29-character source abbreviation POLAR BIOL
iso source abbreviation Polar Biol.
publication date MAY
year published 2015
volume 38
issue 5
beginning page 631
ending page 641
digital object identifier (doi) 10.1007/s00300-014-1626-3
page count 11
web of science category Biodiversity Conservation; Ecology
subject category Biodiversity & Conservation; Environmental Sciences & Ecology
document delivery number DE7TC
unique article identifier WOS:000370838600004