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Factors affecting the foraging behaviour of the European shag : implications for seabird tracking studies

Soanes,LM, Arnould,JP, Dodd,SG, Milligan,G and Green,JA 2014, Factors affecting the foraging behaviour of the European shag : implications for seabird tracking studies, Marine Biology : international journal on life in oceans and coastal waters, vol. 161, no. 6, pp. 1335-1348, doi: 10.1007/s00227-014-2422-x.

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Title Factors affecting the foraging behaviour of the European shag : implications for seabird tracking studies
Author(s) Soanes,LM
Arnould,JPORCID iD for Arnould,JP orcid.org/0000-0003-1124-9330
Dodd,SGORCID iD for Dodd,SG orcid.org/0000-0002-7918-4636
Milligan,G
Green,JA
Journal name Marine Biology : international journal on life in oceans and coastal waters
Volume number 161
Issue number 6
Start page 1335
End page 1348
Total pages 14
Publisher Springer Verlag
Place of publication Heidelberg , Germany
Publication date 2014-06
ISSN 0025-3162
Keyword(s) Science & Technology
Life Sciences & Biomedicine
Marine & Freshwater Biology
LARGE MARINE PREDATOR
PHALACROCORAX-ARISTOTELIS
SAMPLE-SIZE
SCIENCE TECHNOLOGIES
SATELLITE TELEMETRY
BREEDING SUCCESS
WINTERING AREAS
ANIMAL BEHAVIOR
CURRENT SYSTEM
HABITAT USE
Summary Seabird tracking has become an ever more popular tool to aid environmental procedures such as the designation of marine protected areas and environmental impact assessments. However, samples used are usually small and little consideration is given to experimental design and sampling protocol. European shags Phalacrocorax aristotelis were tracked using GPS technology over three breeding seasons and the following foraging trip characteristics: trip duration, trip distance, maximum distance travelled from the colony, size of area used and direction travelled from colony were determined for each foraging trip. The effect of sex, year of study, breeding site, number and age of chicks and the timing of tracking on foraging behaviour were investigated using a General Estimation Equation model. A range of sampling scenarios reflecting likely field sampling were also tested to compare how foraging behaviour differed depending on composition of the sample of birds tracked. Trip distance, trip duration, maximum distance travelled and size of area used were all significantly affected by the breeding site, and the number of chicks a tracked adult was raising. The effect of sex was also seen when examining trip distance, trip duration and the maximum distance travelled. The direction travelled on a foraging trip was also significantly affected by breeding site. This study highlights the importance of sampling regime and the influence that year, sex, age, number of chicks and breeding site can have on the foraging trip characteristics for this coastal feeding seabird. Given the logistical and financial constraints in tracking large numbers of individuals, this study identifies the need for researchers to consider the composition of their study sample to ensure any identified foraging areas are as representative as possible of the whole colony's foraging area.
Language eng
DOI 10.1007/s00227-014-2422-x
Field of Research 060201 Behavioural Ecology
060205 Marine and Estuarine Ecology (incl Marine Ichthyology)
Socio Economic Objective 970106 Expanding Knowledge in the Biological Sciences
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2014, Springer Verlag
Free to Read? Yes
Persistent URL http://hdl.handle.net/10536/DRO/DU:30070319

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Every reasonable effort has been made to ensure that permission has been obtained for items included in DRO. If you believe that your rights have been infringed by this repository, please contact drosupport@deakin.edu.au.