Does allometry of a sexually selected ornamental trait vary with sexual selection intensity? A multi-species test in damselflies

2014 ◽  
Vol 39 (3) ◽  
pp. 399-403 ◽  
Author(s):  
DAVID OUTOMURO ◽  
ADOLFO CORDERO RIVERA ◽  
ANGELA NAVA-BOLAÑOS ◽  
ALEX CÓRDOBA-AGUILAR
Keyword(s):  
Sexual Selection ◽  
Selection Intensity

Parabolic variation in sexual selection intensity across the range of a cold‐water pipefish: implications for susceptibility to climate change

2017 ◽  
Vol 23 (9) ◽  
pp. 3600-3609 ◽  
Author(s):  
Nuno Monteiro ◽  
Mário Cunha ◽  
Lídia Ferreira ◽  
Natividade Vieira ◽  
Agostinho Antunes ◽  
...  
Keyword(s):  
Climate Change ◽  
Sexual Selection ◽  
Cold Water ◽  
Selection Intensity

scholarly journals Ageing via perception costs of reproduction magnifies sexual selection

2018 ◽  
Vol 285 (1892) ◽  
pp. 20182136 ◽  
Author(s):  
Roberto García-Roa ◽  
Manuel Serra ◽  
Pau Carazo
Keyword(s):  
Drosophila Melanogaster ◽  
Sexual Selection ◽  
Sex Pheromones ◽  
Male Reproductive Success ◽  
Selection Intensity ◽  
Costs Of Reproduction ◽  
Short Term ◽  
Male Mortality ◽  
Wide Range ◽  
Reproductive Ageing

Understanding what factors modulate sexual selection intensity is crucial to a wide variety of evolutionary processes. Recent studies show that perception of sex pheromones can severely impact male mortality when it is not followed by mating (perception costs of reproduction). Here, we examine the idea that this may magnify sexual selection by further decreasing the fitness of males with inherently low mating success, hence increasing the opportunity for sexual selection. We use mathematical modelling to show that even modest mortality perception costs can significantly increase variability in male reproductive success under a wide range of demographic conditions. We then conduct a series of assays suggesting that, in Drosophila melanogaster , failure to reproduce early in life may, via perception costs of reproduction, significantly reduces the subsequent fitness of males ( ca 25%), due mostly to increased reproductive ageing. Altogether, our results strongly suggest that perception costs of reproduction can magnify sexual selection in a biologically significant way. Finally, we estimate that around 29% of available studies quantify sexual selection based on short-term fitness estimates that may fail to capture these effects (if they were present in their subject species), and suggest addressing the existence and impact of perception costs of reproduction across taxa should thus be a priority.

scholarly journals Competition for access to mates predicts female-specific ornamentation and polyandry

2019 ◽  
Author(s):  
Rosalind L. Murray ◽  
Elizabeth J. Herridge ◽  
Rob W. Ness ◽  
R. Axel W. Wiberg ◽  
Luc F. Bussière
Keyword(s):  
Sexual Selection ◽  
Selection Intensity ◽  
Nuptial Gifts ◽  
Female Receptivity ◽  
Female Ornamentation ◽  
Trade Offs ◽  
Ornament Evolution ◽  
Female Specific ◽  
Operational Sex Ratios ◽  
Dance Fly

AbstractSexually selected ornaments are highly variable and the factors that drive variation in ornament expression are not always clear. Rare instances of female-specific ornament evolution (such as in some dance fly species) are particularly puzzling. While some evidence suggests that such rare instances represent straightforward reversals of sexual selection intensity, the distinct nature of trade-offs between ornaments and offspring pose special constraints in females. To examine whether competition for access to mates generally favours heightened ornament expression, we built a phylogeny and conducted a comparative analysis of Empidinae dance fly taxa that display ornate female-specific ornaments. We show that species with more female-biased operational sex ratios in lek-like mating swarms have greater female ornamentation, and in taxa with more ornate females, polyandry is increased. These findings support the hypothesis that ornament diversity in dance flies depends on female receptivity, which is associated with contests for nutritious nuptial gifts provided by males. Moreover, our results suggest that increases in female receptivity lead to higher levels of polyandry and sperm competition among males. The incidence of both heightened pre-mating sexual selection on females and post-mating selection on males contradicts assertions that sex-roles are straightforwardly reversed in dance flies.

Resource availability, mating opportunity and sexual selection intensity influence the expression of male alternative reproductive tactics

2018 ◽  
Vol 31 (7) ◽  
pp. 1035-1046 ◽  
Author(s):  
Paolo Giovanni Ghislandi ◽  
Stano Pekár ◽  
Magdalena Matzke ◽  
Sarah Schulte-Döinghaus ◽  
Trine Bilde ◽  
...  
Keyword(s):  
Sexual Selection ◽  
Resource Availability ◽  
Alternative Reproductive Tactics ◽  
Selection Intensity ◽  
Reproductive Tactics

The katydid that was: the tananá, stridulation, Henry Walter Bates and Charles Darwin

2014 ◽  
Vol 41 (1) ◽  
pp. 131-140 ◽  
Author(s):  
Claudio J. Bidau
Keyword(s):  
Sexual Selection ◽  
Charles Darwin ◽  
Bush Cricket

The Amazonian bush-cricket or katydid, Thliboscelus hypericifolius (Orthoptera: Tettigoniidae: Pseudophyllinae), called tananá by the natives was reported to have a song so beautiful that they were kept in cages for the pleasure of listening to the melodious sound. The interchange of letters between Henry Walter Bates and Charles Darwin regarding the tananá and the issue of stridulation in Orthoptera indicates how this mysterious insect, which seems to be very rare, contributed to the theory of sexual selection developed by Darwin.

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