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  Size-dependent sex allocation in a simultaneous hermaphrodite parasite.

Schärer, L., Karlsson, L. M., Christen, M., & Wedekind, C. (2001). Size-dependent sex allocation in a simultaneous hermaphrodite parasite. Journal of Evolutionary Biology, 14(1), 55-67.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-000F-DEB9-C Version Permalink: http://hdl.handle.net/11858/00-001M-0000-000F-DEBA-A
Genre: Journal Article

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Schärer, L., et al., 2001, S- 37739.pdf (Publisher version), 366KB
 
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Schärer, L., et al., 2001, S- 37739.pdf
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 Creators:
Schärer, L., Author
Karlsson, L. M., Author
Christen, M.1, Author              
Wedekind, C., Author
Affiliations:
1Department Evolutionary Ecology, Max Planck Institute for Evolutionary Biology, Max Planck Society, ou_1445634              

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Free keywords: histology; local mate competition; local resource competition; parasite; selfing; sex allocation; simultaneous hermaphroditism; size-dependent sex allocation; stereology; time commitment hypothesis
 Abstract: Most models of sex allocation distinguish between sequential and simultaneous hermaphrodites, although an intermediate sexual pattern, size-dependent sex allocation, is widespread in plants. Here we investigated sex allocation in a simultaneous hermaphrodite animal, the tapeworm Schistocephalus solidus, in which adult size is highly variable. Sex allocation was determined using stereological techniques, which allow measuring somatic and reproductive tissues in a common currency, namely volume. We investigated the relationships between individual volume and allocation to different reproductive tissues using an allometric model. One measure of female allocation, yolk gland volume, increased more than proportionally with individual volume. This is in contrast to the measure of male allocation, testis volume, which showed a strong tendency to increase less than proportionally with individual volume. Together these patterns led to sex allocation being strongly related to individual volume, with large individuals being more biased towards female allocation. We discuss these findings in the light of current ideas about size-dependent sex allocation in, primarily, plants and try to extend them to simultaneous hermaphrodite animals

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Language(s): eng - English
 Dates: 2001-01
 Publication Status: Published in print
 Pages: -
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 Identifiers: eDoc: 116320
Other: 2039/S 37739
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Title: Journal of Evolutionary Biology
  Alternative Title : J. evol. biol.
Source Genre: Journal
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Pages: - Volume / Issue: 14 (1) Sequence Number: - Start / End Page: 55 - 67 Identifier: ISSN: 1010-061X