St. Lawrence Beluga Whales the River Sweepers?
نویسندگان
چکیده
منابع مشابه
Possible mechanisms of action of environmental contaminants on St. Lawrence beluga whales (Delphinapterus leucas).
A small isolated population of beluga whales (Delphinapterus leucas) that are highly contaminated by pollutants, mostly of industrial origin, resides in the St. Lawrence estuary, Québec, Canada. Overhunting in the first half of the century was the probable cause for this population to dwindle from several thousand animals to the current estimate of 500. The failure of the population to recover ...
متن کاملStatus of Beluga (delphinapterus Leucas) in the St. Lawrence River Estuary
The St. Lawrence Estuary (SLE) beluga are listed as threatened under the Species at Risk Act; a Recovery Strategy is defined, and their summer Critical Habitat has been identified. A review of the SLE beluga status (2007) concluded that the population was stable over the period 1988-2006. However, in recent years there has been an increase in reports of death of young-of-the-year, and an appare...
متن کاملCharacterization and profiling of hepatic cytochromes P450 and phase II xenobiotic-metabolizing enzymes in beluga whales (Delphinapterus leucas) from the St. Lawrence River Estuary and the Canadian Arctic.
Cytochromes P450 (CYP, phase I) and conjugating (phase II) enzymes can be induced by and influence the toxicokinetics (metabolism) and toxicity of xenobiotic contaminants in exposed organisms. Beluga whale (Delphinapterus leucas) from the endangered St. Lawrence (SL) River Estuary population exhibit deleterious health effects and various severe pathologies that have been associated with contami...
متن کاملIntramuscular Sarcocystis in two beluga whales and an Atlantic white-sided dolphin from the St. Lawrence estuary, Quebec, Canada.
2. Dubey JP: 1988, Lesions in sheep inoculated with Sarcocystis tenella sporocysts from canine feces. Vet Parasitol 26:237-252. 3. Dubey JP, Lindsay DS, Speer CA, et al.: 1988, Sarcocystis arieticanis and other Sarcocystis species in sheep in the United States. J Parasitol 74: 1033-1038. 4. Dubey JP, Speer CA, Callis G, Blixt JA: 1982, Development of the sheep-canid cycle of Sarcocystis tenella...
متن کاملToxoplasmosis in beluga whales (Delphinapterus leucas) from the St Lawrence estuary: two case reports and a serological survey.
Toxoplasmosis was diagnosed in two free-ranging beluga whales from the St Lawrence estuary, Quebec, Canada, in 1988 and 1998. Histologically, tachyzoites and bradyzoites were present in the brain, spleen, lymph nodes, adrenals and lungs of both animals, and in the thymus of one. These organisms were readily labelled by an indirect immunohistochemical method for Toxoplasma gondii antigens. In th...
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ژورنال
عنوان ژورنال: Environmental Health Perspectives
سال: 2002
ISSN: 0091-6765,1552-9924
DOI: 10.1289/ehp.110-a562b