2003
DOI: 10.7589/0090-3558-39.1.16
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Health Status of Harp Seals (Phoca Groenlandica) and Hooded Seals (Cystophora Cristata) on Sable Island, Nova Scotia, Canada, Concurrent With Their Expanding Range

Abstract: Beach surveys for harp (Phoca groenlandica) and hooded (Cystophora cristata) seals documented a dramatic increase in their numbers on Sable Island in mid 1990s. In the 1980s, no more than five animals of both species were observed on this island each year, however, during late 1994 to 1998, 1,191 harp and 870 hooded seals, mostly young animals, were recorded. Although some of these seals had been killed by sharks, most (roughly 75%) were found alive or as intact carcasses on the beach, and some of the live sea… Show more

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Cited by 12 publications
(11 citation statements)
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“…Common and important causes of morbidity and mortality in pinnipeds include starvation and malnourishment (particularly of neonates and newly weaned pups), conspecific trauma, and predation (Tierney 1977;Baker and McCann 1989;Steiger et al 1989;Banish and Gilmartin 1992;Cooper 1996;McFarlane 1996;Baker et al 1998;Geraci et al 1999;Gulland et al 2001;Lucas et al 2003). Physical injury caused by inter-specific and intra-specific interactions has long been recognised as an important source of non-infectious disease in free-ranging wildlife, including marine mammals (Cooper 1996).…”
Section: Starvation and Physical Injurymentioning
confidence: 99%
“…Common and important causes of morbidity and mortality in pinnipeds include starvation and malnourishment (particularly of neonates and newly weaned pups), conspecific trauma, and predation (Tierney 1977;Baker and McCann 1989;Steiger et al 1989;Banish and Gilmartin 1992;Cooper 1996;McFarlane 1996;Baker et al 1998;Geraci et al 1999;Gulland et al 2001;Lucas et al 2003). Physical injury caused by inter-specific and intra-specific interactions has long been recognised as an important source of non-infectious disease in free-ranging wildlife, including marine mammals (Cooper 1996).…”
Section: Starvation and Physical Injurymentioning
confidence: 99%
“…If we assume that the infectivity of the larvae used in this study is similar to the infectivity encountered in naturally infected fish, our results suggest that harp seals are susceptible to experimental infection with O. circumlitus but that they are capable of limiting infections to a transient nature (i.e., of short duration) or to low-intensity infections with associated mild or subclinical disease. Harp seals may be generally refractory to infection with O. circumlitus, which is supported by field observations in YOY harp seals (Gosselin et al, 1998;Measures, 2001;Lucas et al, 2003).…”
Section: Discussionmentioning
confidence: 60%
“…Otostrongylus circumlitus has a Holarctic and circumpolar distribution and has been reported in many seal species, including harbor seal (Phoca vitulina; Gosselin et al, 1998), ringed seal (Phoca hispida; Onderka, 1989), grey seal (Halichoerus grypus; Baker, 1989), northern elephant seal (Stroud, 1978), and harp seal (Phoca groenlandica; Lucas et al, 2003). Infection with O. circumlitus has also been described in a California sea lion (Kelly et al, 2005).…”
Section: Introductionmentioning
confidence: 99%
“…Harp seals parasites were identified as adult Con-tracaecum osculatum and 3 rd and 4th stage larvae of Contracaecum sp. (Lucas et al 2003). Histological examinations revealed eosinophilic granulomas at the lesions and inflammatory areas.…”
Section: Discussionmentioning
confidence: 99%
“…Other reports on anisakids in ringed seals are by Adams (1988), Vik (1986), Popov et al (1993), Treshchev and Popov (1993), Measures and Gosselin (1994), Lucas et al (2003), Johansen et al (2010) and from Pusa hispida botnica in Bothnian Bay (Valtonen et al 1988). Many parasitic nematodes create some damage to the tissue of intermediate and definitive hosts, causing pathology during their prepatent and patent phases.…”
Section: Introductionmentioning
confidence: 99%