Marine Ecology Progress Series 622:191
Vol. 622: 191–201, 2019 MARINE ECOLOGY PROGRESS SERIES Published July 18 https://doi.org/10.3354/meps12986 Mar Ecol Prog Ser OPENPEN ACCESSCCESS Sex differences in migration and demography of a wide-ranging seabird, the northern gannet Zoe Deakin1,2, Keith C. Hamer3, Richard B. Sherley1,4, Stuart Bearhop2, Thomas W. Bodey2, Bethany L. Clark1, W. James Grecian5, Matt Gummery6, Jude Lane3, Greg Morgan7, Lisa Morgan7, Richard A. Phillips8, Ewan D. Wakefield9, Stephen C. Votier1,* 1Environment and Sustainability Institute, University of Exeter, Penryn Campus, Cornwall TR10 9EZ, UK 2Centre for Ecology and Conservation, University of Exeter, Penryn Campus, Cornwall TR10 9EZ, UK 3School of Biology, University of Leeds, Leeds LS2 9JT, UK 4Bristol Zoological Society, Clifton, Bristol BS8 3HA, UK 5Scottish Oceans Institute, University of St Andrews, St Andrews KY16 8LB, UK 6Marine Stewardship Council, Marine House, 1 Snow Hill, London EC1A 2DH, UK 7RSPB Ramsey Island, St Davids, Pembrokeshire SA62 6PY, UK 8British Antarctic Survey, Natural Environment Research Council, High Cross, Madingley Road, Cambridge CB3 0ET, UK 9University of Glasgow, Institute of Biodiversity, Animal Health and Comparative Medicine, Graham Kerr Building, Glasgow G12 8QQ, UK ABSTRACT: Marine vertebrates show a diversity of migration strategies, including sex differences. This may lead to differential demography, but the consequences of such between-sex variation are little understood. Here, we studied the migration of known-sex northern gannets Morus bas- sanus — a partial migrant with females ~8% heavier than males. We used geolocators to determine wintering areas of 49 breeding adults (19 females and 30 males) from 2 colonies in the northeast Atlantic (Bass Rock and Grassholm, UK).
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