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          Institute: MPI für Evolutionsbiologie     Collection: Evolutionary ecology     Display Documents

ID: 116320.0, MPI für Evolutionsbiologie / Evolutionary ecology
Size-dependent sex allocation in a simultaneous hermaphrodite parasite.
Authors:Schärer, L.; Karlsson, L. M.; Christen, M.; Wedekind, C.
Date of Publication (YYYY-MM-DD):2001-01
Title of Journal:Journal of Evolutionary Biology
Journal Abbrev.:J. evol. biol.
Issue / Number:1
Start Page:55
End Page:67
Copyright:Jahrbuch 2002, Copyright MPG 2002
Review Status:not specified
Audience:Not Specified
Intended Educational Use:No
Abstract / Description: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
Free Keywords:histology; local mate competition; local resource competition; parasite; selfing; sex allocation; simultaneous hermaphroditism; size-dependent sex allocation; stereology; time commitment hypothesis
External Publication Status:published
Document Type:Article
Affiliations:MPI für Evolutionsbiologie/Abt. Evolutionsökologie
External Affiliations:Univ Paris 06, Ecol Lab, UMR 7625, 7 Quai St Bernard-Case 237, F-75252 Paris 05, France; Univ Bern, Inst Zool, Abt Verhaltensokol, CH-3012 Bern, Switzerland; Univ Bern, Inst Anat, Stereol Unit, Bern, Switzerland; Univ Edinburgh, Inst Cell Anim & Populat Biol, Edinburgh, Midlothian, Scotland
Identifiers:ISSN:1010-061X [ID-No:1]
LOCALID:2039/S 37739 [Listen-Nummer/S-Nummer]
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