Parasitic infection of the hyperiid amphipod Themisto libellula in the Canadian Beaufort Sea (Arctic Ocean), with a description of Ganymedes themistos sp. n. (Apicomplexa, Eugregarinorida)

Polar Biology volume 33, pages1339–1350(2010)Cite this article

Abstract

Two parasites were found in the hyperiid amphipod Themisto libellula sampled with nets and collected by sediment traps over the annual cycle in the Canadian Beaufort Sea. The trophozoites of the newly described gregarine Ganymedes themistos sp. n. infected the digestive tract of 60.2% of the T. libellula analyzed from net collections. An unidentified ciliate infected the body cavity of 4.4% of amphipods. G. themistos possessed the ball-like structure at the anterior end and the cup-like invagination at the posterior end that are typical of the genus Ganymedes. The frequency and severity (number of parasites host−1) of infection by G. themistos increased with the length of T. libellula in the range 8–20 mm, and leveled off at ca. 94% and 186 trophozoites host−1 on average in the range 20–34 mm. Spatially, gregarine infection was less severe (63 ± 100 G. themistos host−1) on the Slope than on the Mackenzie Shelf (110 ± 160) and in the Amundsen Gulf (132 ± 157). No evidence of an impact of trophozoite infection on the feeding and sexual maturation of the host was found. For a given size of T. libellula, infection by both parasites was more frequent in the traps than in the nets (G. themistos: 91.0% vs. 82.7%; ciliates: 16.3% vs. 6%). The 2.7 times higher infection frequency in the traps suggested that the ciliate parasite may kill its host.

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Acknowledgments

We thank the crew of CCGS Pierre Radisson and CCGS Amundsen for their professional work at sea. S. Lebel, L. Michaud, L. Létourneau, and G. Darnis helped in the field and in the laboratory. This study was part of the Canadian Arctic Shelf Exchange Study (CASES) funded by the Natural Sciences and Engineering Research Council of Canada. S. Rueckert and B. S. Leander were funded by the Tula Foundation’s Centre for Microbial Diversity and Evolution. This is a contribution to Québec-Océan at Université Laval and the Canada Research Chair on the response of marine arctic ecosystems to climate warming.

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  1. Québec-Océan, Département de Biologie, Université Laval, Quebec, QC, G1V 0A6, Canada

    Anna J. Prokopowicz, Josée Michaud & Louis Fortier

  2. Departments of Zoology and Botany, University of British Columbia, Vancouver, BC, V6T 1Z4, Canada

    Sonja Rueckert & Brian S. Leander

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  1. Anna J. Prokopowicz
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  2. Sonja Rueckert
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  3. Brian S. Leander
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  4. Josée Michaud
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  5. Louis Fortier
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Correspondence to Anna J. Prokopowicz.

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Prokopowicz, A.J., Rueckert, S., Leander, B.S. et al. Parasitic infection of the hyperiid amphipod Themisto libellula in the Canadian Beaufort Sea (Arctic Ocean), with a description of Ganymedes themistos sp. n. (Apicomplexa, Eugregarinorida). Polar Biol 33, 1339–1350 (2010). https://doi.org/10.1007/s00300-010-0821-0

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Keywords

  • Themisto libellula
  • Gregarine parasites
  • Parasite impacts
  • Feeding
  • Sexual maturation
  • Survival
  • Ganymedes themistos sp. n.
  • DNA phylogeny
  • Morphology