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27 results for “male-male competition”
Data from: Sperm competition games: a general model for pre-copulatory male-male competition
Reproductive males face a trade-off between expenditure on pre-copulatory male-male competition – increasing the number of females that they secure as mates – and sperm competition – increasing their fertilisation success with those females. Previous sperm allocation models have focused on scramble competition in which males compete by searching for mates and the number of matings rises linearly with pre-copulatory expenditure. However, recent studies have emphasised contest competition involving pre-copulatory expenditure on armaments, where winning contests may be highly dependent on marginal increases in relative armament level. Here we develop a general model of sperm allocation that allows us to examine the effect of all forms of pre-copulatory competition on sperm allocation patterns. The model predicts that sperm allocation decreases if either the 'mate-competition loading', a, or the number of males competing for each mating, M, increases. Other predictions remain unchanged from previous models: (i) expenditure per ejaculate should increase and then decrease, and (ii) total post-copulatory expenditure should increase, as the level of sperm competition increases. A negative correlation between a and M is biologically plausible, and may buffer deviations from the previous models. There is some support for our predictions from comparative analyses across dung beetle species and frog populations.
Data from: The mutational decay of male-male and hermaphrodite-hermaphrodite competitive fitness in the androdioecious nematode C. elegans
Androdioecious Caenorhabditis have a high frequency of self-compatible hermaphrodites and a low frequency of males. The effects of mutations on male fitness are of interest for two reasons. First, when males are rare, selection on male-specific mutations is less efficient than in hermaphrodites. Second, males may present a larger mutational target than hermaphrodites because of the different ways in which fitness accrues in the two sexes. We report the first estimates of male-specific mutational effects in an androdioecious organism. The rate of male-specific inviable or sterile mutations is ≤ 5 x 10-4/generation, below the rate at which males would be lost solely due to those kinds of mutations. The rate of mutational decay of male competitive fitness is ~0.17%/generation; that of hermaphrodite competitive fitness is ~0.11%/generation. The point estimate of ~1.5X faster rate of mutational decay of male fitness is nearly identical to the same ratio in Drosophila. Estimates of mutational variance (VM) for male mating success and competitive fitness are not significantly different from zero, whereas VM for hermaphrodite competitive fitness is similar to that of non-competitive fitness. Two independent estimates of the average selection coefficient against mutations affecting hermaphrodite competitive fitness agree to within two-fold, 0.33%-0.5%.
Female choice and male-male competition are affected by noise-filled calls in a treefrog
<p>Both human and non-human a<span>nimals communicating acoustically face the problem of noise interference, especially anuran</span>s during mating activities.<span> Previous studies focused on the e</span>ffect of continuous noise on signal recognition, but it is still unknown whether different notes in advertisement calls filled by noise affect female choice and male-male competition or not. In this study, we tested female preferences and male evoked vocal responses in serrate-legged small treefrog (<i><span>K</span></i><i><span>ur</span></i><i><span>ixalus odontotarsus</span></i>), by broadcasting the five-note advertisement call and the advertisement call with the second, third or fourth note filled by noise respectively. In phonotaxis experiments, females significantly discriminated against the advertisement call with the fourth note filled by noise, although they did not discriminate against other two noise-filled calls, which indicates that the effect of noise on female preference is related to the order of filled notes in the advertisement call. In playback experiments, males increased the total number of notes and notes/call in response to noise-filled calls compared with spontaneous calls. More interesting, the vocal responses evoked by noise-filled calls were similar to those evoked by complete advertisement calls, suggesting that males may recognize the noise-filled calls as complete advertisement calls. Taken together, our study shows that different notes in advertisement calls filled by noise have different effects on female choice and male-male competition.</p>
Data from: The mutational decay of male-male and hermaphrodite-hermaphrodite competitive fitness in the androdioecious nematode C. elegans
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Data from: Sexually antagonistic evolution caused by male-male competition in the pistil
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Data from: Sperm competition games: a general model for pre-copulatory male-male competition
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Female choice and male-male competition are affected by noise-filled calls in a treefrog
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