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In hermaphrodites, sex allocation theory predicts that individuals allocate to reproduction a fixed amount of resources divided among male and female functions and that the fraction devoted to each sex depends on the mating group size (Charnov 1982; Fischer 1984).
In outcrossing hermaphrodites forming pairs, the mating group size is considered to be = 2.
In this condition both partners are expected to allocate as few resources as possible to the male function.
All remaining resources are expected to be devolved to egg production.
Charnov (1982) and Fischer (1984) derived these theoretical predictions from the Hamilton's (1967) theory of Local Mate Competition (LMC).Sex allocation theory predicts that, in hermaphroditic organisms, individuals allocate a fixed amount of resources divided among male and female functions to reproduction and that the proportion devoted to each sex depends on the mating group size.As the mating group size increases, hermaphrodites are predicted to allocate proportionally more resources to the male and less resources to the female function (approaching equal allocation to both sexes) to face increased sperm competition.Moreover, complex trade-offs may occur between resources allocated to reproduction and those devoted to growth and maintenance.In a growing number of hermaphroditic species sex allocation is reported to be also size dependent (Petersen and Fischer 1996; Trouvè and others 1999; Schärer and others 2001; Angeloni 2003; Tan and others 2004).
Tan and others (2004) documented that in the leech sp., although in the latter a trade-off between sexual functions is revealed under specific conditions (Schärer and others 2005).