The feeding ecology of little auks raises questions about winter zooplankton stocks in North Atlantic surface waters
- 17 March 2010
- journal article
- Published by The Royal Society in Biology Letters
- Vol. 6 (5), 682-684
- https://doi.org/10.1098/rsbl.2010.0082
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 500 m 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 50 m) 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.This publication has 16 references indexed in Scilit:
- Pelagic and sympagic contribution of organic matter to zooplankton and vertical export in the Barents Sea marginal ice zoneDeep Sea Research Part II: Topical Studies in Oceanography, 2008
- Diel vertical migration of Arctic zooplankton during the polar nightBiology Letters, 2008
- Seasonal changes in diets of seabirds in the North Water Polynya: a multiple-indicator approachMarine Ecology Progress Series, 2008
- Stable isotopes document seasonal changes in trophic niches and winter foraging individual specialization in diving predators from the Southern OceanJournal of Animal Ecology, 2007
- Seabird numbers and prey consumption in the North AtlanticICES Journal of Marine Science, 2006
- Cormorants dive through the Polar nightBiology Letters, 2005
- Estimation of carbon flux to dovekies (Alle alle) in the North WaterDeep Sea Research Part II: Topical Studies in Oceanography, 2002
- Visual predators and the diel vertical migration of copepods under Arctic sea ice during the midnight sunJournal of Plankton Research, 2001
- Stable isotopes of carbon and nitrogen in the study of avian and mammalian trophic ecologyCanadian Journal of Zoology, 2000
- Stable isotopes of carbon and nitrogen in the study of avian and mammalian trophic ecologyCanadian Journal of Zoology, 2000