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  • 1
    Online Resource
    Online Resource
    Spatial and temporal variation in abundance of 〈i〉Diplostomum〈/i〉 spp. in walleye (〈i〉Stizostedion vitreum〈/i〉) and white suckers (〈i〉Catostomus commersoni〈/i〉) from the St. Lawrence River
    Canadian Science Publishing ; 2001
    In:  Canadian Journal of Zoology Vol. 79, No. 3 ( 2001), p. 355-369
    Details
    In: Canadian Journal of Zoology, Canadian Science Publishing, Vol. 79, No. 3 ( 2001), p. 355-369
    Type of Medium: Online Resource
    ISSN: 1480-3283 , 0008-4301
    URL: Article
    DOI: 10.1139/cjz-79-3-355
    RVK:
    WA 15000
    Language: Unknown
    Publisher: Canadian Science Publishing
    Publication Date: 2001
    detail.hit.zdb_id: 1490831-1
    SSG: 12
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  • 2
    Online Resource
    Online Resource
    Nematode parasites and leukocyte profiles of Northern Leopard Frogs, Rana pipiens : location, location, location
    Canadian Science Publishing ; 2015
    In:  Canadian Journal of Zoology Vol. 93, No. 1 ( 2015-01), p. 41-49
    Details
    In: Canadian Journal of Zoology, Canadian Science Publishing, Vol. 93, No. 1 ( 2015-01), p. 41-49
    Abstract: Globally, amphibians face a variety of anthropogenic stresses that include exposure to contaminants such as agricultural pesticides. Pesticides may negatively affect amphibian immune systems, concomitantly increasing susceptibility to parasitism. We quantified nematodes and evaluated leukocyte profiles of Northern Leopard Frogs (Rana pipiens Schreber, 1782) collected from five wetlands in southwestern Quebec, Canada, that spanned a gradient of pesticide exposure. Three taxa of nematode parasites (Rhabdias ranae Walton, 1929, genus Oswaldocruzia Travassos, 1917, and genus Strongyloides Grassi, 1879) were sufficiently numerous for detailed evaluation. When all frogs were pooled, frog size was negatively correlated with nematode species richness, abundances of each of the three nematode species, and densities of three different leukocytes. When all frogs were pooled, there was strong evidence of both negative and positive associations between pairs of parasite species. However, none of the previous relationships was significant within wetlands. Our results reveal strong spatial organization of amphibian–parasite communities and illustrate the importance of controlling for sampling locale in evaluating host–parasite associations. Finally, although several response variables varied significantly among wetlands, causes of this variation did not appear to be related to variation in nematode parasitism or pesticide exposure.
    Type of Medium: Online Resource
    ISSN: 0008-4301 , 1480-3283
    URL: Article
    DOI: 10.1139/cjz-2014-0156
    RVK:
    WA 15000
    Language: English
    Publisher: Canadian Science Publishing
    Publication Date: 2015
    detail.hit.zdb_id: 1490831-1
    SSG: 12
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  • 3
    Online Resource
    Online Resource
    Interactions between parasites and pollutants in yellow perch (Perca flavescens) in the St. Lawrence River, Canada: implications for resistance and tolerance to parasites
    Canadian Science Publishing ; 2010
    In:  Canadian Journal of Zoology Vol. 88, No. 3 ( 2010-03), p. 247-258
    Details
    In: Canadian Journal of Zoology, Canadian Science Publishing, Vol. 88, No. 3 ( 2010-03), p. 247-258
    Abstract: Parasites were examined in yellow perch, Perca flavescens (Mitchill, 1814), from four localities ranging in degree of pollution in the St. Lawrence River, Quebec, Canada, to examine the effects of the most prevalent parasite species on expression of biomarkers of oxidative stress. Various biomarkers appeared to be affected by the infection levels of Apophallus brevis Ransom, 1920 and genus Diplostomum von Nordmann, 1832. For certain biomarkers, interactions between infection level and pollution type were detected for A. brevis, Diplostomum spp., and genus Ichthyocotylurus Odening, 1969. Activity of glutathione reductase in gill tissue decreased with increasing numbers of A. brevis, but only at the two most polluted localities. Catalase activity in kidney increased with numbers of Diplostomum spp. at the polluted localities, but not at the two least contaminated sites. Results suggest that parasites may affect expression of biomarkers of pollution and that pathogenicity of parasites may be enhanced under polluted conditions. Exposure to contaminants appears to reduce tolerance, but not resistance, to parasites in yellow perch in this system. This type of immunosuppression may be widespread in polluted ecosystems.
    Type of Medium: Online Resource
    ISSN: 0008-4301 , 1480-3283
    URL: Article
    DOI: 10.1139/Z09-140
    RVK:
    WA 15000
    Language: English
    Publisher: Canadian Science Publishing
    Publication Date: 2010
    detail.hit.zdb_id: 1490831-1
    SSG: 12
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  • 4
    Online Resource
    Online Resource
    Parasites of spottail shiners ( Notropis hudsonius ) in the St. Lawrence River: effects of municipal effluents and habitat
    Canadian Science Publishing ; 2006
    In:  Canadian Journal of Zoology Vol. 84, No. 10 ( 2006-10-01), p. 1461-1481
    Details
    In: Canadian Journal of Zoology, Canadian Science Publishing, Vol. 84, No. 10 ( 2006-10-01), p. 1461-1481
    Abstract: Parasite communities were examined from spottail shiners (Notropis hudsonius (Clinton, 1824)) collected from nine localities in the St. Lawrence River around the Island of Montréal and downstream from its municipal effluents in June and September 1998–2000. A total of 30 taxa were found, the most common being Diplostomum spp. Parasite communities were dominated by digeneans, most of which were larval stages that infect birds as definitive hosts. Mean abundance of the most common parasites varied among localities and years. Component community and mean infracommunity species richness fluctuated within and among years at the various localities. Similarity analyses demonstrated that parasite component communities from the different localities could be partitioned according to season, year, and water mass. Canonical correspondence analysis demonstrated that the parasite component communities from the different localities could be distinguished clearly, indicating that the fish in the different localities compose separate populations or stocks. Year, season, and water mass correlated most strongly among the species–environment relationships. The abundance and distribution of parasite species appeared to be subtly influenced by environmental contaminants and urban effluents, leading to slight reductions in parasite diversity. However, the parasite species composition at the various localities more clearly reflected the local food-web structure and biodiversity in terms of the distributions of various invertebrate groups, piscivorous fish, and waterfowl along the St. Lawrence River.
    Type of Medium: Online Resource
    ISSN: 0008-4301 , 1480-3283
    URL: Article
    DOI: 10.1139/z06-088
    RVK:
    WA 15000
    Language: English
    Publisher: Canadian Science Publishing
    Publication Date: 2006
    detail.hit.zdb_id: 1490831-1
    SSG: 12
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  • 5
    Online Resource
    Online Resource
    Spatial and temporal variation in abundance of Diplostomum spp. in walleye ( Stizostedion vitreum ) and white suckers ( Catostomus commersoni ) from the St. Lawrence River
    Canadian Science Publishing ; 2001
    In:  Canadian Journal of Zoology Vol. 79, No. 3 ( 2001-03-01), p. 355-369
    Details
    In: Canadian Journal of Zoology, Canadian Science Publishing, Vol. 79, No. 3 ( 2001-03-01), p. 355-369
    Abstract: Abundances of eye flukes (Diplostomum spp.) were compared between walleye (Stizostedion vitreum) and white suckers (Catostomus commersoni) collected in late summer 1997 from Lake St. Louis and Lake St. Pierre, two expansions of the St. Lawrence River in Quebec, Canada. The white sucker, a benthic consumer, was more heavily infected than the walleye, a pelagic piscivore, in both lakes. Infection levels increased significantly with host age and size. For both species, abundance of Diplostomum spp. within each age group and length class was higher in fish from Lake St. Louis than in those from Lake St. Pierre. Walleye of all ages and white suckers [Formula: see text]7 years old from Lake St. Louis were also larger at age than those of corresponding age from Lake St. Pierre. Therefore, walleye and white suckers from Lake St. Louis are probably different populations from those in Lake St. Pierre. The higher infection levels in Lake St. Louis are most likely due to the larger number of ring-billed gulls (Larus delawarensis), an important definitive host of Diplostomum spp., in colonies in close proximity to that lake; there are 〉 75 000 pairs within 40 km of Lake St. Louis and 16 000 pairs within 40 km of Lake St. Pierre. No detrimental effects of infection with Diplostomum spp. could be detected on fish fork length, body mass, condition index, or gonadosomatic index. Walleye from shallow lentic waters in Lake St. Louis were larger and possessed heavier infections of Diplostomum spp. than those from deeper lotic waters. Walleye collected from a fixed trap near Quebec City in July 1997 were smaller but more heavily infected with Diplostomum spp. than those collected in October, which implies that different populations of fish may be present seasonally at this location. A visual index developed to measure the degree of opacity of the lens of fishes does not appear to be a reliable indicator of levels of infection with eye flukes. Experimental infection of laboratory-raised juvenile ring-billed gulls with metacercariae from the lenses of various fish species collected in the St. Lawrence River demonstrated that metacercariae were primarily Diplostomum indistinctum (8492%), the remainder being Diplostomum huronense, and this pattern is consistent across host species and localities.
    Type of Medium: Online Resource
    ISSN: 0008-4301 , 1480-3283
    URL: Article
    DOI: 10.1139/z00-209
    RVK:
    WA 15000
    Language: English
    Publisher: Canadian Science Publishing
    Publication Date: 2001
    detail.hit.zdb_id: 1490831-1
    SSG: 12
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  • 6
    Online Resource
    Online Resource
    Vitamin A stores, teratogenesis, and EROD activity in white sucker, Catostomus commersoni , from Rivière des Prairies near Montréal and a reference site
    Canadian Science Publishing ; 1995
    In:  Canadian Journal of Fisheries and Aquatic Sciences Vol. 52, No. 8 ( 1995-08-01), p. 1703-1713
    Details
    In: Canadian Journal of Fisheries and Aquatic Sciences, Canadian Science Publishing, Vol. 52, No. 8 ( 1995-08-01), p. 1703-1713
    Abstract: White sucker, Catostomus commersoni, were sampled from the Rivière des Prairies in the vicinity of Montréal and the upper reaches of the Ottawa River in La Verendrye Park (reference site). Rivière des Prairies fish had lower liver retinol (p ≤ 0.0001) and retinyl palmitate (p ≤ 0.0001) concentrations than fish from the reference site. Rivière des Prairies females and males contained only 9.3 and 30%, respectively, of the vitamin A stores detected in reference fish. Age was an important variable. Covariance analysis revealed that the the rate of retinyl palmitate storage with age was higher (p ≤ 0.0001) for sucker at the reference site. Retinaldehyde was the major retinoid in eggs; however, concentrations were not different between the two sites. The prevalence of malformations was 1.49% among Rivière des Prairies larvae, greater (p ≤ 0.002) than that of the reference group. Eye deformities (i.e., anophthalmia, synopsia) were 11.8 times more prevalent in the Rivière des Prairies larvae. Ethoxyresorufin-O-deethylase (EROD) was greater (p ≤ 0.0003) in the Rivière des Prairies fish. Liver EROD activity in adult females was positively correlated (R = 0.81; p ≤ 0.0004) with the prevalence of deformities of their progeny. Semiquantitative results showed that embryo mortality also tended to increase with EROD activity.
    Type of Medium: Online Resource
    ISSN: 0706-652X , 1205-7533
    URL: Article
    DOI: 10.1139/f95-762
    Language: English
    Publisher: Canadian Science Publishing
    Publication Date: 1995
    detail.hit.zdb_id: 7966-2
    detail.hit.zdb_id: 1473089-3
    SSG: 21,3
    SSG: 12
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