organochlorine and metal residues in eggs of waterfowl nesting on islands in lake michigan off door county, wisconsin, egg from each of 114 red-breasted merganser (mergus serrator) nests in 1977 and 92 nests in 1978 was collected and later analyzed for organochlorines, polybrominated biphenyls (pbbs), polychlorinated styrenes (pcss), and metals. one egg was also collected from each of the dabbling duck nests located. twenty-nine of these eggs were analyzed for organochlorines and metals in 1977; 10 eggs were analyzed in 1978. all merganser eggs contained dde, polychlorinated biphenyls (pcbs), and dieldrin; a ...19816796936
avian influenza virus screening in wild waterfowl in norway, 2005.the prevalence of influenza a virus infection, and the distribution of different subtypes of the virus, were studied in 604 geese and ducks shot during ordinary hunting 2005. the study was based upon molecular screening of cloacal swabs taken by the hunters. the sampling included the following species: greylag (anser anser), mallard (anas platyrhynchos), wigeon (anas penelope), teal (anas crecca), goosander (mergus merganser), tufted duck (aythya fuligula), common scoter (melanitta nigra), golde ...200717494599
sediment ingestion rates in waterfowl (anatidae) and their use in environmental risk assessment.when waterfowl (anatidae) ingest sediment as they feed, they are exposed to the environmental contaminants in those sediments. the rate of ingestion may be key to assessing environmental risk. rates of sediment ingestion were estimated as from <2% to 22% in 16 species of waterfowl collected in the northeastern united states. the piscivorous red-breasted merganser (mergus serrator) ingested sediment at the lowest rate and the benthos-feeding canvasback (aythya valisineria) at the highest rate. se ...200818237229
diversity of bird schistosomes in anseriform birds in iceland based on egg measurements and egg morphology.radix balthica is the only freshwater mollusc in iceland that has been found to be the intermediate host of ocellate furcocercariae. infections are common. on average, 4.8% out of almost 7,000 snails examined during 2003-2006 were found to shed cercariae in late summer and autumn. search for adult bird schistosome worms, eggs and miracidia in the intestines and in the nasal cavity of 110 water birds of the orders gaviiformes (one species), podicipediformes (one species) and anseriformes (nine sp ...200818299894
bird schistosome diversity in iceland: molecular evidence.during the years 2002-2007, icelandic freshwater snails and birds from different orders were examined for bird schistosomes. only the snail radix peregra and anatid birds proved to be infected. in total, 32 samples of bird schistosome cercariae from seven localities and four samples of adults of anas platyrhynchos and mergus serrator from two localities were used for sequencing of the internal transcibed spacer (its) region of rdna. based on the sequence and position in the phylogenetic tree, fi ...200919296877
a review on swimmer's itch and the occurrence of bird schistosomes in the past decade, swimmer's itch (si) has repeatedly occurred in people who have been wading or bathing in ponds or lakes in iceland where water birds and snails are abundant. some of the affected sites were warmed by geothermal activity, and others were not. a search for the causative agent of si, ocellate furcocercariae that have been found in iceland only in radix peregra snails, revealed an average infection prevalence of 1.4% (n = 12,432). locally, infection rates commonly exceeded 6%, th ...200919368747
first report of typhlitis/typhlohepatitis caused by tetratrichomonas gallinarum in three duck species.two red-breasted mergansers (mergus serrator), one hooded merganser (lophodytes cucullatus), and one common eider (somateria mollissima) from a german zoological collection died of necrotizing typhlitis/typhlohepatitis within 2 years. using a newly established chromogenic in situ hybridization assay, numerous intralesional trophozoites of tetratrichomonas gallinarum could be detected in formalin-fixed and paraffin-embedded tissues from the caeca and livers of the affected birds. partial sequenci ...201021154060
cryptosporidium baileyi--infection in red-breasted merganser (mergus serrator) ducklings from a zoological garden.infection of the bursa of fabricius with cryptosporidium baileyi was diagnosed in a group of hand reared red-breasted merganser (mergus serrator) ducklings during one breeding season in a german zoological garden.the birds had died in an emaciated and anaemic state after problems with spontaneous feeding. the bursae were infected with moderate to high numbers of cryptosporidia, which were associated with hyperplasia, degeneration and sloughing of the affected epithelial cells and mild heterophil ...201223045806
trichobilharzia mergi sp. nov. (trematoda: digenea: schistosomatidae), a visceral schistosome of mergus serrator (l.) (aves: anatidae).parasitological investigations on red-breasted mergansers (mergus serrator l.) in iceland revealed digenean flukes of the family schistosomatidae. adult worms were detected in blood vessels of the large intestine and eggs were deposited in the mucosa and surrounded by granulomatous reactions. traditional morphological methods showed that the flukes have very slender filiform bodies, males are equipped with a short gynaecophoric canal and both suckers and spatulate ends are present on each sex. a ...201323501058
a highly repeated retropseudogene-like sequence in dna of the redbreasted merganser (mergus serrator).two highly repeated nucleotide sequences (rbmi and rbmii) cloned from an ecori digest of dna of the redbreasted merganser (mergus serrator) account for approx. 5 to 10% of the dna of m. serrator and the closely related mergus merganser. complete dna digestion of seven members of the mergini with ecori produces distinct, relatively species-specific patterns of a few high-mr (greater than 1.5 kb) fragments of rbmi-like material. in such digests rbmii forms ladder-type patterns with monomers of app ...19902332168
spatial-genetic structuring in a red-breasted merganser (mergus serrator) colony in the canadian maritimes.the clustering of kin is widespread across the animal kingdom and two of the primary mechanisms underlying the formation of these patterns in adult kin are (1) philopatric tendencies and (2) actively maintained kin associations. using polymorphic microsatellites, we had set out to characterize the level of genetic-spatial organization within a colony of female red-breasted mergansers (mergus serrator) breeding on a series of small barrier islands in kouchibouguac national park, nb, canada. addit ...201122393488
further declines in organochlorines in eggs of red-breasted mergansers from lake michigan, 1977-1978 versus 1990 versus 2002.from 1977-1978 to 1990, concentrations of polychlorinated biphenyls (pcbs) and most organochlorine pesticides declined in eggs of red-breasted mergansers (mergus serrator) nesting on islands in northwestern lake michigan. further declines took place between 1990 and 2002. between 1977-1978 and 1990 total pcbs decreased 60% (from 21 to 8.5 microg/g, wet weight). an additional decline of 46% took place between 1990 and 2002 (8.5 to 4.6 microg/g). between 1977-1978 and 1990 p,p (')-dde decreased 66 ...200918974941
declines in organochlorines in eggs of red-breasted mergansers from lake michigan, 1977-1978 versus 1990.from 1977-1978 to 1990, concentrations of polychlorinated biphenyls (pcbs) and most organochlorine pesticides declined in eggs of red-breasted mergansers (mergus serrator) nesting on islands in northwestern lake michigan. total pcbs decreased 60% (from 21 ppm in 1977-1978 to 8.5 ppm in 1990) and p,p'-dde decreased 66% (from 6.5 to 2.2 ppm). dieldrin decreased only 16% (from 0.82 to 0.69 ppm). in 1990, 79.1% of incubated eggs hatched, which was not significantly different from the 83.5% that hatc ...199424201884
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