effects of sonic booms on breeding gray seals and harbor seals on sable island, canada.the concorde produces audible sonic booms as it passes 15 km north of sable island, nova scotia, where gray and harbor seals occur year round. the purpose of this research was to assess how sonic booms affect these seals. the intensity of the booms was measured and three types of data (beach counts, frequency of behavior, and heart rate) were collected before and after booms during the breeding seasons of the two species. in addition to the data taken during breeding, beach counts were made befo ...200211837965
prevalence of influenza a virus in live-captured north atlantic gray seals: a possible wild reservoir.influenza a virus (iav) has been associated with multiple unusual mortality events (umes) in north atlantic pinnipeds, frequently attributed to spillover of virus from wild-bird reservoirs. to determine if endemic infection persists outside of umes, we undertook a multiyear investigation of iav in healthy, live-captured northwest atlantic gray seals (halichoerus grypus). from 2013 to 2015, we sampled 345 pups and 57 adults from cape cod, ma, usa and nova scotia, canada consistently detecting iav ...201627485496
polybrominated diphenyl ethers (pbdes) in seal populations from eastern and western canada: an assessment of the processes and factors controlling pbde distribution in seals.polybrominated diphenyl ether (pbde) concentrations were measured in the blubber of five mother-pup pairs of grey seals (halichoerus grypus) from sable island, nova scotia (ns) sampled in 1995 and in 20 harbour seals (phoca vitulina) from british columbia (bc) sampled in 1991-1992. concentrations in maternal grey seals from sable island averaged 112+/-55.2 ng/g lipid (mean+/-s.d.) and were over twice the concentrations measured in their pups; higher brominated pbdes showed a distinct decline in ...200818359511
the rate of fertilization in male mating tactics of the polygynous grey seal.studies using molecular markers have shown that some grey seal males may be gaining success through exhibiting alternative mating tactics. we estimated the probability of fertilization success of grey seal males exhibiting the primary tactic of female defence and one alternative tactic of mating with departing females on sable island, nova scotia, canada, during the breeding seasons of 1997-2002. although the fertilization rate of the primary tactic (27-43%) was greater than that of the alternat ...200415488010
larval nematodes infecting amphiporeia virginiana (amphipoda: pontoporeioidea) on sable island, nova scotia.three species of larval nematodes were found infecting the nearshore subtidal amphipod amphiporeia virginiana collected from beaches on sable island, nova scotia. five and 2 sealworms, pseudoterranova decipiens s.l., were found in 2,020 and 2,044 amphipods, respectively, collected in 1991 and 1992, dissected, and examined microscopically. two sealworms, 1 paracuaria adunca and 1 ascarophis sp., were found in 5,157 amphipods collected in 1992 and enzymatically digested. infection with each specie ...19938277392
factors influencing and consequences of breeding dispersal and habitat choice in female grey seals (halichoerus grypus) on sable island, nova scotia.selection of breeding location can influence reproductive success and fitness. breeding dispersal links habitat use and reproduction. this study investigated factors affecting breeding dispersal and its reproductive consequences in grey seals (halichoerus grypus) on sable island, nova scotia. breeding dispersal distance was determined in 692 individually marked, known-age female grey seals observed from 2004 to 2014. we used generalized linear mixed-effects models to test hypotheses concerning e ...201727864645
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