The feeding ecology of little auks raises questions about winter zooplankton stocks in North Atlantic surface watersReportar como inadecuado




The feeding ecology of little auks raises questions about winter zooplankton stocks in North Atlantic surface waters - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

* Corresponding author 1 CEFE - Centre d’Ecologie Fonctionnelle et Evolutive 2 CEBC - Centre d-études biologiques de Chizé 3 Alaska Pacific University 4 Greenland Institute for Natural Resources 5 Norwegian Polar Institute 6 Department of Zoology 7 DST-NRF Centre of Excellence at the Percy FitzPatrick Institute

Abstract : Copepods are essential components of marine food webs worldwide. In the North Atlantic, they are thought to perform vertical migration and to remain at depths more than 500m during winter. We challenge this concept through a study of the winter feeding ecology of little auks Alle alle, a highly abundant planktivorous seabird from the North Atlantic. By combining stable isotope and behavioural analyses, we strongly suggest that swarms of copepods are still available to their predators in water surface layers less than 50m during winter, even during short daylight periods. Using a new bioenergetic model, we estimate that the huge number 20–40 million birds of little auks wintering off southwest Greenland consume 3600–7200 tonnes of copepods daily, strongly suggesting substantial zooplankton stocks in surface waters of the North Atlantic in the middle of the boreal winter

Keywords : diving behaviour stable isotope energetic modelling food requirements seabird marine food web





Autor: Jérôme Fort - Yves Cherel - Ann M.A. Harding - Carsten Egevang - Harald Steen - Grégoire Kuntz - Warren P Porter - D. Grémill

Fuente: https://hal.archives-ouvertes.fr/



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