Endoparasites can alter their host's heavy metal concentrations by sequestering metals in their own tissues. Contracaecum spp. (a nematode), but not Drepanocephalus spathans (a trematode), were bioaccumulating mercury to concentrations 1.5 times above cormorant hosts. Nematodes did not have significantly greater stable nitrogen isotope values (δ(15)N) than their hosts, which is contradictory to...

Changes in the size and proportion of limbs and other structures have played a key role in the adaptive evolution of species. However, despite the ubiquity of these modifications, we have a very limited idea of how these changes occur on the genetic and molecular levels. To fill this gap, we studied a recent and extreme case of wing and pectoral skeleton size reduction leading to flightlessness...

We studied the effects of low-frequency climate change on the reproductive performance of 11 species of marine bird in the southern California Current system, 1969–1997. Reproductive performance of Brown Pelican (Pelecanus occidentalis) and Double-crested Cormorant (Phalacrocrax auritus) in southern California demonstrated an increase in the 1970s and early 1980s, attributable to recovery from ...

background: present study was carried out in north of iran to investigate the concentration of mercury (hg) as one of the most toxic metals in tissues of two species of birds. methods: in this study, 15 birds from coot (fulica atra) and 18 birds from cormorant (phalacrocorax carbo) were hunted in anzali and gomishan wetlands. data-analyses carried out using spss software version 17 licenced by ...

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...

Twenty-four polymorphic microsatellite markers were developed for the double-crested cormorant (Phalacrocorax auritus). The number of alleles ranged from two to 13 and observed heterozygosities ranged from 0.032 to 0.871. The use of these loci should enable researchers and biologists to learn more about the population structure and ecology of this species.

Abstract Perch (Perca fluviatilis) is an important prey species of the great cormorant (Phalacrocorax carbo sinensis) in coastal waters northern Baltic Sea. The annual predation mortality caused by cormorants was estimated based on consumed numbers perch relation to abundance vulnerable age groups sea. We used existing stock assessment data (Archipelago Sea) or a simple population model other a...

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 ...

A new species of haematozoa, Babesia ugwidiensis sp. nov. from a cormorant is described. This is the first species of piroplasm to be recorded from the Phalacrocoracidae and the relationship of this parasite to other Babesia spp. from marine hosts is discussed.

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...