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Sources of variation in endohelminth parasitism of common eiders over-wintering in the Canadian Arctic

Published on Feb 1, 2019in Polar Biology2.002
· DOI :10.1007/s00300-018-2423-1
J. Tourangeau1
Estimated H-index: 1
(Carleton University),
Jennifer F. Provencher17
Estimated H-index: 17
(Acadia University)
+ 2 AuthorsMark R. Forbes33
Estimated H-index: 33
(Carleton University)
Abstract
Documenting how climate change will affect Arctic ecosystems and food web dynamics requires an understanding of current sources of variation in species distributions, frequency, and abundance. Host–parasite interactions are expected to be altered in the coming decades under warming conditions. However, in many Polar Regions, there is little information describing parasite–host assemblages. We examine how gastrointestinal helminths of northern common eider ducks (Somateria mollissima sedentaria) in the low Arctic vary with host age, sex and sampling year. We found that the prevalence of an acanthocephalan (Profilicollus sp.) varied in eiders with age, sex and year, while a cestode (Microsomacanthus sp.) varied with host sex. Two other species of endohelminths (Lateriporus sp., Corysonoma sp.) were not found to vary with sex, age or sampling year, and another species (Microphallus sp.) did not vary with sex or age. Our results highlight the complexity inherent in Arctic host–parasite assemblages, and the need for more detailed studies to better understand how changing climatic conditions may affect species distributions, frequency or abundance.
  • References (48)
  • Citations (2)
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References48
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Arctic wildlife can be exposed to high mercury (Hg) levels, and are also naturally exposed to gastrointestinal parasites that can reduce condition and negatively affect reproductive output and/or survival in similar ways. Importantly, both Hg and parasites are increasing in wildlife in some Arctic regions. We studied the northern common eider duck (Somateria mollissima) to explore how Hg in association with both natural levels and experimentally reduced parasitic infections, affect reproduction ...
8 CitationsSource
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Abstract Although physiological traits and phenology are thought to be evolved traits, they often show marked variation within populations, which may be related to extrinsic factors. For example, trace elements such as mercury (Hg) and lead (Pb) alter biochemical processes within wildlife that may affect migration and breeding. While there is a growing understanding of how contaminants may influence wildlife physiology, studies addressing these interactions in free-living species are still limit...
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In many animal species, males and females differ in their levels of contaminants and/or parasitic infections. Most contaminants and gastro-intestinal parasites are obtained through prey ingestion, and thus the causes of sex differences in the distribution of these factors might follow similar pathways. We studied the northern common eider duck (Somateria molissima borealis) as an avian model, and used directed separation path analysis to explore the causes of sex differences in mercury (Hg) and ...
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Costs of parasitism are predicted to be higher with greater parasite intensities and higher inter-parasite competition (diversity). We tested whether greater helminth intensities and diversity were associated with poorer body composition (whole-body fat, protein, mineral and true body mass) in lesser snow geese, Chen caerulescens caerulescens. As part of a larger study on nutritional ecology, 828 wintering or migrating geese were shot between January and May 1983 in 27 different date–locations (...
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#1Jennifer F. Provencher (UVic: University of Victoria)H-Index: 17
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