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CHANGES IN ABUNDANCE OF CYPRINID AND PERCID PREY AFFECT RATE OF PREDATION BY CORMORANTS PHALACROCORAX-CARBO-CARBO ON SALMON SALMO-SALAR SMOLT IN NORTHERN-IRELAND

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Warke, GMA and Day, KR (1995) CHANGES IN ABUNDANCE OF CYPRINID AND PERCID PREY AFFECT RATE OF PREDATION BY CORMORANTS PHALACROCORAX-CARBO-CARBO ON SALMON SALMO-SALAR SMOLT IN NORTHERN-IRELAND. ARDEA, 83 (1). pp. 157-166. [Journal article]

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Abstract

Cormorant diet is described from the analysis of pellets, fledgling regurgitates and the stomach contents of adult birds. Non-breeding coastal birds consumed mostly marine fish while breeding birds were found to feed mostly on freshwater fish species. The long distances travelled to inland feeding sites while breeding suggested that the high energy investment in commuting could be traded against the rewards of greater, more varied or more predictably exploitable food supplies in certain freshwaters at certain times. In years when Roach and Perch were much less abundant in Lough Neagh, diet at the breeding colony reverted to an increased proportion of marine fish and even a high Salmon smelt run on an inland river was practically neglected. In recent years the impact of Cormorants on fish in this river close to the breeding colony has declined and a number of reasons for this are discussed. Nevertheless, Cormorants visit the river all the year round and their impact on older Salmon parr is likely to be particularly significant.

Item Type:Journal article
Faculties and Schools:Faculty of Life and Health Sciences
Faculty of Life and Health Sciences > School of Environmental Sciences
Research Institutes and Groups:Environmental Sciences Research Institute
Environmental Sciences Research Institute > Terrestrial Ecology
ID Code:2348
Deposited By:Professor Keith Day
Deposited On:01 Feb 2010 21:38
Last Modified:21 Jul 2011 16:28

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