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Evidence for Toxoplasma gondii in migratory vs. nonmigratory herbivores in a terrestrial arctic ecosystem
Univ Saskatchewan, Dept Vet Microbiol, Saskatoon, SK S7N 5B4, Canada..
Snow Leopard Trust, Seattle, WA 98103 USA..
Univ Saskatchewan, Dept Vet Microbiol, Saskatoon, SK S7N 5B4, Canada..
Environm Canada, Prairie & No Wildlife Res Ctr, Saskatoon, SK S7N 0X4, Canada..
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2015 (English)In: Canadian Journal of Zoology, ISSN 0008-4301, E-ISSN 1480-3283, Vol. 93, no 8, 671-675 p.Article in journal (Refereed) Published
Abstract [en]

It is currently unclear how Toxoplasma gondii (Nicolle and Manceaux, 1908) persists in arctic tundra ecosystems in the absence of felid definitive hosts. To investigate potential transmission routes of T. gondii in a terrestrial arctic food web, we collected samples from two migratory herbivores, Ross's Geese (Chen rossi (Cassin, 1861)) and Lesser Snow Geese (Chen caerulescens (L., 1758)), and from two resident herbivores, Nearctic brown lemmings (Lemmus trimucronatus (Richardson, 1825)) and collared lemmings (Dicrostonyx groenlandicus (Traill, 1823)), trapped at Karrak Lake, Nunavut, Canada. Antibodies were detected in 76 of 234 (32.4%) serum samples from Ross's Geese and 66 of 233(28.3%) serum samples from Lesser Snow Geese. We did not detect T. gondii antibodies in filter-paper eluate tested from thoracic fluid samples collected from 84 lemmings. We did not detect T. gamin DNA in brain tissue from these lemmings. Although a small sample size, our findings suggest that lemmings in this terrestrial arctic ecosystem are not exposed to, or infected with, the parasite. This suggests that oocysts are not introduced into the terrestrial arctic ecosystem at Karrak Lake via freshwater runoff from temperate regions. This study demonstrated that live adult arcticnesting geese are exposed to T. gamin and therefore migratory herbivorous hosts are potential sources of T. gondii infection for predators in terrestrial arctic ecosystems.

Place, publisher, year, edition, pages
2015. Vol. 93, no 8, 671-675 p.
Keyword [en]
Lemmus sp., Dicrostonyx sp., Chen spp., Toxoplasma gondii, Arctic, goose, lemming, toxoplasmosis
Research subject
SWEDARCTIC 2012, Fjällrävens populationsdynamik
Identifiers
URN: urn:nbn:se:polar:diva-2353DOI: 10.1139/cjz-2015-0078ISI: 000359262800011OAI: oai:DiVA.org:polar-2353DiVA: diva2:858616
Available from: 2015-10-02 Created: 2015-10-02 Last updated: 2015-10-02

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