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  Seasonal changes in host phenotype manipulation by an acanthocephalan: time to be transmitted?

Benesh, D. P., Hasu, T., Seppälä, O., & Valtonen, E. T. (2009). Seasonal changes in host phenotype manipulation by an acanthocephalan: time to be transmitted? Parasitology, 136(2), 219-230. doi:10.1017/S0031182008005271.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-000F-D5F2-5 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-000F-D5F3-3
Genre: Journal Article

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Benesh_2009.pdf (Publisher version), 326KB
 
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 Creators:
Benesh, D. P.1, Author              
Hasu, T., Author
Seppälä, O., Author
Valtonen, E. T., Author
Affiliations:
1Department Evolutionary Ecology, Max Planck Institute for Evolutionary Biology, Max Planck Society, ou_1445634              

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Free keywords: Acanthocephala; Asellus aquaticus; host manipulation; host-parasite interaction; host pigmentation; intermediate host; plastic/flexible behaviour; seasonality; trophic transmission
 Abstract: Many complex life cycle parasites exhibit seasonal transmission between hosts. Expression of parasite traits related to transmission, such as the manipulation of host phenotype, may peak in seasons when transmission is optimal. The acanthocephalan Acanthocephalus lucii is primarily transmitted to its fish definitive host in spring. We assessed whether the parasitic alteration of 2 traits (hiding behaviour and coloration) in the isopod intermediate host was more pronounced at this time of year. Refuge use by infected isopods was lower, relative to uninfected isopods, in spring than in summer or fall. Infected isopods had darker abdomens than uninfected isopods, but this difference did not vary between seasons. The level of host alteration was unaffected by exposing isopods to different light and temperature regimes. In a group of infected isopods kept at 4°C, refuge use decreased from November to May, indicating that reduced hiding in spring develops during winter. Keeping isopods at 16°C instead of 4°C resulted in higher mortality but not accelerated changes in host behaviour. Our results suggest that changes in host and/or parasite age, not environmental conditions, underlie the seasonal alteration of host behaviour, but further work is necessary to determine if this is an adaptive parasite strategy to be transmitted in a particular season.

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Language(s): eng - English
 Dates: 2009-02
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: eDoc: 429289
DOI: 10.1017/S0031182008005271
Other: 2680/S 38976
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Title: Parasitology
Source Genre: Journal
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Pages: - Volume / Issue: 136 (2) Sequence Number: - Start / End Page: 219 - 230 Identifier: ISSN: 0031-1820 (print)
ISSN: 1469-8161 (online)