Abstract：
:When competing for mates, males typically exhibit higher rates of intrasexual aggression and courtship than females. Operational sex ratio, represented here by adult sex ratio (ASR) as a proxy, is likely the best predictor of this competition, which typically increases between members of one sex as members of the opposite sex become rarer. Moreover, in populations subject to high predation, males often decrease mating competitive behaviour due to predation risk. We explored the combined effects of ASR and population of origin (low vs. high ambient predation risk) on mating competition in male and female wild-caught Trinidadian guppies. Both male and female aggression rates increased with ASR, but the increase for males was only significant in the low-predation population. In regard to male mating tactics, courtship propensity was unaffected by ASR, while the propensity to sneak increased at male-biased ASRs. Guppies from a high predation population had lower aggression rates than their low predation counterpart, but male courtship and sneaking attempts did not differ between populations. Surprisingly, females were just as aggressive as males when competing for mates. These results highlight the trade-offs between antipredator and agonistic behaviour, which may affect sexual selection pressures in wild populations.
journal_name
Behav Processesjournal_title
Behavioural processesauthors
Chuard PJC,Brown GE,Grant JWAdoi
10.1016/j.beproc.2016.05.001subject
Has Abstractpub_date
2016-08-01 00:00:00pages
1-10eissn
0376-6357issn
1872-8308pii
S0376-6357(16)30107-3journal_volume
129pub_type
杂志文章abstract：:Two experiments used eye tracking to examine visual searching for expected outcomes in humans during an associative-learning task. In both, participants learned to press keys on a keyboard to activate weapons to repel invading spaceships in the presence of predictive "sensors." In both experiments, eye tracking showed...
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journal_title：Behavioural processes
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journal_title：Behavioural processes
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