NDLI: Demographic costs of sex allocation: hermaphrodites perform better in sparse populations

Content Provider	Taylor & Francis Online
Author	Sella, G. Schleicherová, D. Lorenzi, M. C.
Abstract	Ophryotrocha diadema is an outcrossing, simultaneous hermaphroditic polychaete with external fertilization. In isolated pairs, mature worms take turn contributing eggs upon the condition that their partners reciprocate egg donation. In dense populations, these worms do not reciprocate. Instead, they strongly compete for mating in their preferred male role and produce few eggs. This plastic sex allocation may result in an overall different reproductive performance: mean individual reproductive output will be larger in sparse than in dense populations. We tested this hypothesis by measuring the individual reproductive output (paternal and maternal offspring) of worms in sparse and dense replicated populations. In dense populations, mean individual reproductive output was fourfold lower than that in sparse populations. We hypothesise that such dramatic demographic costs are potentially widespread in outcrossing simultaneous hermaphrodites with external fertilization and plastic sex allocation. The reproductive output of hermaphroditic organisms is a function of population density (i.e. the number of conspecifics) and studies on population growth and reproductive performance should take this effect into account.
Starting Page	72
Ending Page	77
Page Count	6
File Format	PDF HTM / HTML
ISSN	11250003 17485851
DOI	10.1080/11250003.2013.868934
Journal	The European Zoological Journal
Volume Number	81
Issue Number	1
Language	English
Publisher	Taylor & Francis
Publisher Date	2014-04-17
Access Restriction	Open
Subject Keyword	Reproductive load Tragedy of the commons Population size Mating Ophryotrocha diadema
Content Type	Text
Resource Type	Article
Subject	Animal Science and Zoology

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