Condition-dependent sex allocation by clones of a galling aphid
نویسندگان
چکیده
منابع مشابه
Conflict over condition-dependent sex allocation can lead to mixed sex-determination systems
Theory suggests that genetic conflicts drive turnovers between sex-determining mechanisms, yet these studies only apply to cases where sex allocation is independent of environment or condition. Here, we model parent-offspring conflict in the presence of condition-dependent sex allocation, where the environment has sex-specific fitness consequences. Additionally, one sex is assumed to be more co...
متن کاملCondition Dependent Effects on Sex Allocation and Reproductive Effort in Sequential Hermaphrodites
Theory predicts the optimal timing of sex change will be the age or size at which half of an individual's expected fitness comes through reproduction as a male and half through reproduction as a female. In this way, sex allocation across the lifetime of a sequential hermaphrodite parallels the sex allocation of an outbreeding species exhibiting a 1:1 ratio of sons to daughters. However, the exp...
متن کاملA closer look at the spatial architecture of aphid clones.
Nearly 25 years ago, Ellstrand & Roose (1987) reviewed what was known at the time of the genetic structure of clonal plant species. What is the relationship between space and clonal fitness, they asked. What is the best way for a clone to grow within its ecological neighbourhood? The pot had been stirred 10 years previously by Janzen (1977), who pointed out how little we know about the populati...
متن کاملSex allocation based on relative and absolute condition.
Traditional models predict that organisms should allocate to sex based on their condition relative to the condition of their competitors, tracking shifts in mean condition in fluctuating environments, and maintaining an equilibrium sex ratio. In contrast, when individuals are constrained to define their condition absolutely, environmental fluctuations induce fluctuating sex ratios and the evolu...
متن کاملResource-dependent sex-allocation in a simultaneous hermaphrodite.
Most sex allocation theory is based on the relationship between the resource investment into male and female reproduction and the consequent fitness returns (often called fitness-gain curves). Here we investigate the effects of resource availability on the sex allocation of a simultaneously hermaphroditic animal, the free-living flatworm Macrostomum lignano. We kept the worms under different re...
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ژورنال
عنوان ژورنال: Behavioral Ecology and Sociobiology
سال: 2012
ISSN: 0340-5443,1432-0762
DOI: 10.1007/s00265-012-1402-8