The double-crested cormorant, Phalacrocorax auritus, is considered the primary depredating bird species on commercially produced channel catfish, Ictalurus punctatus, in the southeastern USA. We simulated different levels of cormorant predation on losses at harvest and economic effects on channel catfish production in a multiple-batch cropping system. We observed significant (P< 0.05) declines ...

The nutrients imported by breeding waterbirds should be considered when identifying the main sources of nutrient input to lakes. Lake Lesser Prespa (Greece), including adjacent Vromolimni pond, hosts numerous protected that nest in densely populated colonies across reedbeds. accelerated eutrophication lake recent years has been increasing concern. In addition likely large (i.e., anthropogenic a...

This is the first study on diet of Great Cormorant wintering in Algeria. It carried out Beni Haroun, largest dam lake country, north-east The trophic menu Phalacrocorax carboin this based four species fish; Abramis bramas, Carassius carassius, Barbus barbus and Cyprinus carpio. However, carassius represent two most important Cormorant’s diet. total consumed biomass 155,364.18 g, average contain...

Piscivorous birds consume diets which are rich in highly-polyunsaturated n-3 fatty acids; these play vital roles in embryonic development but are very susceptible to oxidative damage. The effects of such diets on the fatty acid composition and antioxidant content of the yolk were investigated in the northern gannet Morus bassanus, the great skua Catharacta skua, the American white pelican Pelec...

Abstract Piscivorous wildlife is often perceived as competitors by humans. Great cormorants of the continental subspecies (Phalacrocorax carbo sinensis) in Baltic and North Sea increase, while local cod (Gadus morhua) stocks decline. In contrast, numbers Atlantic carbo), breeding along Norwegian Barents Seas, have been relatively stable. We investigated diet both great cormorant colonies Coast ...

Abstract In contrast to many other water birds, the Great Cormorant, Phalacrocorax carbo (Phalacrocoracidae), shows a typical wing-spreading behavior after diving. This has been linked partial wettability of Cormorant’s feathers based on unusual structure contour feathers. Close rachis, these have closed vane with very densely spaced barbs but an open in more peripheral feather parts. To invest...

Nutrient enrichment in coastal marine systems can have profound impacts on trophic networks. In the Baltic Sea, the population of Great Cormorant (Phalacrocorax carbo sinensis) has increased nearly exponentially since the mid-1990 s, and colonies of these seabirds can be important sources of nitrogen enrichment for nearby benthic communities due to guano runoff. In this study we used stable iso...

Abstract To further our knowledge of the basis wing-spreading behavior cormorants, we compared feathers cormorants with a diving and dabbling duck. Only cormorant shows division into closed vane next to rhachis an open in periphery feather. Macroscopically, uropygial gland Great Cormorant ( Phalacrocorax carbo ) is bilobed, papilla wears circlet type I. Histologically, consists tightly packed g...