Models of sexual selection predict that mating competition within a population will increase with a biased operational sex ratio (OSR). However, these models do not consider any influence of the individuals' capacity for additional matings. Using the sand goby, Pomatoschistus minutus, we tested ...
Obtaining a random sample of witchcraft accusations within a population is challenging, if not impossible1,66. Attempts to systematically collect cases within a given location and timeframe cannot guarantee that all are brought to the attention of researchers19. Comparative studies of this kind ...
"Longevity" of sperm within the female of the melon fly, Dacus cucurbitae (Diptera: Tephritidae), and its relevance to sperm competition Variation in copulation duration of Drosophila mojavensis strains was influenced by both sexes. Males maintained predominant control, as copulation durati... Y Ts...
However, in the simplest case with three competing types, the long-term outcome may not be so clear if two of the three represent the ends of a continuous heritable trait distribution within one species, as has been recently demonstrated empirically in a short-term experiment with plants. ...
The study was carried out in six study sites that were not identical in tree species composition or red squirrel density (see also study design below). This was addressed statistically by modelling study site nested within situation as a random effect in the MCMCglmm, thereby correcting for any...
Intrasexual competition within colonies of the damselfishStegastes nigricans was investigated. Both males and females held individual territories, and thes
aOn a local level, within a single colony or population, there are many good reasons for butterflies to emigrate from high-density sites towards low density sites. These include avoiding competition by locating free resources, such as food or territories , and avoiding direct conspecific harassment...
Scientists usually attribute sexual differences in sociality to sex-specific dispersal patterns and the availability of kin within the social group. In mos... J Lehmann,C Boesch - 《International Journal of Primatology》 被引量: 154发表: 2008年 Sexual Differences in Chimpanzee Sociality Scientists ...
The same relationship is also predicted to occur within species if individual females adjust their sex ratios facultatively. This final prediction was not supported by data from a wingless male species, a male wing-dimorphic species or a winged male species. 展开 ...
The index of intra-sexual competition (ISC) was included as a categorical factor (two classes: high versus low ISC). To account for non-independence of individuals within each population or study site, we included “individual” nested within “site” as a random factor in all models. We ...