Results 161 to 170 of about 1,924 (184)
Geografisk Tidsskrift, 2010 During the last decades, the number of perennial colonies of piscivorousbirds especially cormorant colonies in North-western Europehas grown rapidly due to protection.
Henrik Breuning-Madsen
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North American Journal of Aquaculture, 2000 Predation by piscivorous birds is considered a substantial threat to the aquaculture industry. However, lethal control of birds at aquaculture facilities has raised concerns about the effects on the distribution and abundance of populations of the ...
Bradley F Blackwell, Richard A Dolbeer
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Ecological constraints on digestive physiology in carnivorous and piscivorous birds
Journal of Experimental Zoology, 1999Digestion strategies of meat- and fish-eating birds have received little attention, and the assumption has generally been made that there is rather little variation in digestion parameters between species in these guilds. We show that there is significant though small variation between species in apparent absorption efficiency.
G.M. Hilton +4 more
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ECOSYSTEM-BASED MANAGEMENT OF PREDATOR–PREY RELATIONSHIPS: PISCIVOROUS BIRDS AND SALMONIDS
Ecological Applications, 2008Predator-prey relationships are often altered as a result of human activities. Where prey are legally protected, conservation action may include lethal predator control. In the Columbia River basin (Pacific Northwest, USA and Canada), piscivorous predators have been implicated in contributing to a lack of recovery of several endangered anadromous ...
Francis K, Wiese +3 more
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Digeneans Collected from Piscivorous Birds in North Carolina, U.S.A
Comparative Parasitology, 2004During investigations of digenetic fluke diseases of aquaculture fish, 11 digeneans (Apharyngostrigea simplex, Apharyngostrigea cornu, Diplostomum compactum, Diplostomum spathaceum, Posthodiplostomum minimum, Hysteromorpha triloba, Clinostomum marginatum, Drepanocephalus spathans, Mesorchis denticulatus, Microparyphium facetum, and Notocotylus pacifera)
James R. Flowers +3 more
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Liver and Breast Feather Mercury in Piscivorous Birds of the Caspian Sea: Monitoring Changes
Bulletin of Environmental Contamination and Toxicology, 2011Mercury in the liver and breast feathers of the Common Cormorant, and in three species of Grebes from the southern coast of the Caspian Sea, were determined. The Common Cormorant had significantly more mercury in its tissues (liver: 8.5 ± 1.5; feather 8 ± 1 mg/kg dry weight) than Grebes (Great Crested Grebe: 3 ± 0.5, 8 ± 1.5; Black-necked Grebe: 3 ± 0 ...
F, Rajaei +4 more
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Recovery of infectious pancreatic necrosis virus from the faeces of wild piscivorous birds
Aquaculture, 1992Abstract Faecal samples were collected from wild birds frequenting salmonid fish hatcheries to determine if birds excrete infectious pancreatic necrosis (IPN) virus in their faeces. Samples were collected from early June through early September. IPN virus was detected in faeces from herons, mallards, and other birds at titres similar to the titres ...
P.E. McAllister, W.J. Owens
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Ardea, 2018
This study aims to select piscivorous bird species to be used as indicators to monitor changes in fish diversity at the Banc d'Arguin, Mauritania. Such species should have a high diet diversity, low dietary overlap and data should be easy to collect. We compared the diets of five colony nesting bird species at the Banc d'Arguin: the Slender-billed Gull
Jan Veen, Hanneke Dallmeijer, Thor Veen
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This study aims to select piscivorous bird species to be used as indicators to monitor changes in fish diversity at the Banc d'Arguin, Mauritania. Such species should have a high diet diversity, low dietary overlap and data should be easy to collect. We compared the diets of five colony nesting bird species at the Banc d'Arguin: the Slender-billed Gull
Jan Veen, Hanneke Dallmeijer, Thor Veen
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Killing of piscivorous birds at Scottish fin fish farms, 1984–1987
Biological Conservation, 1994Abstract In recent years there has been growing concern about the environmental consequences of the rapidly expanding Scottish fish farm industry. One such concern is the control of fish predators. A questionnaire survey (covering 78% of all Scottish fin fish farms) in 1985 showed that many farmers thought piscivorous birds were a problem and that ...
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