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2 results for “Bateman's principles”
Sexual selection in seaweed? Testing Bateman's principles in the red alga Gracilaria gracilis
<p>In anisogamous species, sexual selection is expected to be stronger in males. Bateman's principles state that the variance in (i) reproductive and (ii) mating success is greater for males and (iii) the relationship between reproductive success and mating success (the Bateman gradient) is also stronger for males than for females. Sexual selection, based on Bateman's principles, has been demonstrated in animals and some angiosperms, but never in seaweed. Here we focus on the oogamous haploid-diploid rhodophyte <em>Gracilaria gracilis</em> in which previous studies have shown evidence for non-random mating, suggesting the existence of male-male competition and female choice. We estimated mating and reproductive success using paternity analyses in a natural population where up to 92% of fertilizations occurred between partners of that population. The results show that the variance in mating success is significantly greater in males than in females and that the Bateman gradient is positive only in males. Distance to female partners also explains a minor part of the variance in male mating success. Although there is no evidence for sexual dimorphism, our study supports the hypothesis that sexual selection occurs in <em>G. gracilis</em>, likely on male traits, even if we cannot observe, qualify, or quantify them yet.</p>
Sexual selection in seaweed? Testing Bateman’s principles in the red alga Gracilaria gracilis
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