The effect of hunger on mating behaviour and sexual selection for male body size in Gerris buenoi

2002 ◽  
Vol 64 (3) ◽  
pp. 369-375 ◽  
Author(s):  
Amaya Ortigosa ◽  
Locke Rowe
Keyword(s):  
Sexual Selection ◽  
Body Size ◽  
Mating Behaviour ◽  
Male Body ◽  
Male Body Size ◽  
Selection For

Sexual selection for increased male body size and protandry in a spider

2004 ◽  
Vol 68 (5) ◽  
pp. 1041-1048 ◽  
Author(s):  
Alexei A. Maklakov ◽  
Trine Bilde ◽  
Yael Lubin
Keyword(s):  
Sexual Selection ◽  
Body Size ◽  
Male Body ◽  
Male Body Size ◽  
Selection For

scholarly journals Evolution of sexual dimorphism and Rensch’s rule in the beetle genusLimnebius(Hydraenidae): is sexual selection opportunistic?

PeerJ ◽  
2017 ◽  
Vol 5 ◽  
pp. e3060 ◽  
Author(s):  
Andrey Rudoy ◽  
Ignacio Ribera
Keyword(s):  
Sexual Selection ◽  
Body Size ◽  
General Pattern ◽  
Strong Support ◽  
Male Body ◽  
Rensch’S Rule ◽  
Male Body Size ◽  
Rensch's Rule ◽  
The Individual ◽  
Male Genital

Sexual size dimorphism (SSD) is widespread among animals, with larger females usually attributed to an optimization of resources in reproduction and larger males to sexual selection. A general pattern in the evolution of SSD is Rensch’s rule, which states that SSD increases with body size in species with larger males but decreases when females are larger. We studied the evolution of SSD in the genusLimnebius(Coleoptera, Hydraenidae), measuring SSD and male genital size and complexity of ca. 80% of its 150 species and reconstructing its evolution in a molecular phylogeny with 71 species. We found strong support for a higher evolutionary lability of male body size, which had an overall positive allometry with respect to females and higher evolutionary rates measured over the individual branches of the phylogeny. Increases in SSD were associated to increases in body size, but there were some exceptions with an increase associated to changes in only one sex. Secondary sexual characters (SSC) in the external morphology of males appeared several times independently, generally on species that had already increased their size. There was an overall significant correlation between SSD, male body size and male genital size and complexity, although some lineages with complex genitalia had low SSD, and some small species with complex genitalia had no SSD. Our results suggest that the origin of the higher evolutionary variance of male body size may be due to lack of constraints rather than to sexual selection, that may start to act in species with already larger males due to random variation.

scholarly journals Sexual selection on size and shape in Japanese beetles (Popillia japonica)

2020 ◽  
Vol 31 (4) ◽  
pp. 1073-1083 ◽  
Author(s):  
Clint D Kelly
Keyword(s):  
Sexual Selection ◽  
Body Size ◽  
Mating Success ◽  
Insect Pest ◽  
Popillia Japonica ◽  
Female Size ◽  
Male Body ◽  
Japanese Beetle ◽  
Size Dimorphism ◽  
Selection For

Abstract The mobility hypothesis argues that species in which males compete for mates in scrambles often exhibit female-biased size dimorphism because smaller male body size should increase male mobility and success in searching for mates. Sexual dimorphism can be further exaggerated if fecundity or sexual selection concurrently selects for larger female size. Scramble competition can select for trait characteristics that optimize locomotion; for example, long and slender wings should be favored if aerial speed is important to mating success. I tested these predictions in the scrambling Japanese beetle (Popillia japonica), a female-biased size dimorphic insect pest that is invasive to North America. Multivariate selection analyses support the prediction that smaller body size and larger wings in males benefit their mating success. My analyses also revealed significant selection for larger wings in females but, contrary to prediction, direct sexual selection favors smaller body size in females. These results support the mobility hypothesis and partially explain the evolution of female-biased size dimorphism in this species. Sexual selection favored rounder bodies in females and more tapered bodies in males, whereas, in both sexes, the effect of wing shape appears less important to fitness than wing size.

scholarly journals SEXUAL SELECTION IN TOADS: THE ROLES OF FEMALE CHOICE AND MALE BODY SIZE

Evolution ◽  
1978 ◽  
Vol 32 (2) ◽  
pp. 264-270 ◽  
Author(s):  
Henry M. Wilbur ◽  
Daniel I. Rubenstein ◽  
Lincoln Fairchild
Keyword(s):  
Sexual Selection ◽  
Body Size ◽  
Female Choice ◽  
Male Body ◽  
Male Body Size
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