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Showing 1 to 14 of 14 for “"Sexual conflict"”.
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Sexual conflict and the evolution of nuptial feeding
… in a population. If this is not the case, and sexual conflict has exerted a cost-benefit imbalance between the sexes, then the expectation is that the system will evolve towards the reduction of nuptial gift giving. Here, utilizing the Allonemobius socius complex of crickets where females …
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Sexual conflict and division of labour during incubation
… resource allocation to a given breeding attempt. Sexual conflict can occur over evolutionary or ecological time, as predicted by ‘sealed bid’ and ‘negotiation’ models of parental investment, respectively. While researchers have traditionally used handicapping or mate removal to induce variation in …
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Daily patterns of oviposition mediate sexual conflict in a polygynandrous mating system
Conflicts of interest between the sexes are considered strong forces in shaping mating systems. Thus an understanding of the behaviour of both sexes is essential. The waterstrider Aquarius remigis has been used in several studies investigating sexual conflict. However, little is known about …
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The Evolution of Extended Sexual Receptivity in Chimpanzees: Variation, Male-Female Associations, and Hormonal Correlates
<p>Sexual conflict occurs when female and male fitness interests diverge. In a social system characterized by aggressive sexual coercion and the risk of infanticide, female chimpanzees (Pan troglodytes) respond to this conflict by exhibiting an exaggerated sexual swelling that advertises sexual …
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Do females counter against costly males in the degu, Octodon degus?
Sexual conflict over reproduction may result in females incurring reproductive costs from males. Females may counter against costly males through social support from cohesive relationships with other females. In plural breeders, social support may promote communal offspring care, improving the …
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The evolution of parental care in insects
… parental care. Lastly I investigate an unstudied sexual conflict in male-carers. If females prefer caring males, males should be selected to display their eggs conspicuously. Conspicuousness may carry costs to eggs, so females should prefer inconspicuous locations. In the field this conflict …
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Environmental variation and life-history evolution: experiments on Caenorhabditis remanei
… (hermaphroditism and gonochorism, respectively). Sexual conflict, different reproductive strategies between males and females, has previously been identified in the soil nematode of C. elegans. However, evidence of sexual conflict is lacking in gonochoristic species of nematode. Thus, I conducted …
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Function and evolution of seminal fluid components in Drosophila
… fluids are a battleground for evolutionary conflicts such as male-female sexual conflict, sperm competition, and cryptic female choice. These forces have driven rapid diversification of reproductive molecules across species, with lineage-specific gains, losses, and gene duplications shaping …
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Causes and consequences of color polymorphism in Rambur’s forktail (Ischnura ramburii)
Variation in male and female forms occurs in countless animal taxa, and has fascinated evolutionary biologists since Darwin and Wallace. The underpinnings of male variation have been elucidated in diverse groups; less is known about the selective forces that diversify female forms in nature. …
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The generation and maintenance of diversity in a rapid adaptive radiation
… of sex chromosome evolution as a result of sexual conflict and the potential importance of sexual selection in the diversification of Lake Malawi cichlids. Overall we observe various mechanisms generating and maintaining diversity at different levels of biological organization. We use …
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Genetically based social communication in an inbred group-living wild mammal
… and between groups, as well as intra- and intersexually. Their exceptional breeding system, cooperative behavior and inbreeding levels make them the ideal target for investigating the effects of the MHC on fitness and its potential involvement in chemical communication. I used high throughput …
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Sex-specific reproductive strategies in redfronted lemurs (Eulemur fulvus rufus, Primates, Lemuridae)
… monopolize a group of females. Due to male intrasexual competition, the sex ratio of groups of anthropoid primates is generally female-biased. Gregarious Malagasy lemurs deviate from theoretical expectations derived from sexual selection theory and from patterns found among anthropoids because …
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The Evolution of Orthopteran Mating Systems and the Reproductive Ecology of New Zealand Cave Wētā
Sexual selection has long been recognised as driving the evolution of diverse morphological and behavioural traits in animals. Decades of concerted research into the topic has uncovered reproductive adaptations ranging from the beautiful to the horrific, and insects provide some of the most …
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The socio-endocrinology of female reproductive strategies in wild Assamese macaques (Macaca assamensis)
… und Januar statt. Die unauffälligen subkaudalen Sexualschwellungen signalisierten nicht die Ovulationswahrscheinlichkeit, und die Weibchen zeigten keine Kopulationsrufe oder Anzeichen von Verhaltensöstrus. Dies weist auf eine verschleierte Fertilität bei Weibchen dieser Art hin. Demgemäß standen …