scholarly journals The evolution of ‘bizarre structures’ in dinosaurs: biomechanics, sexual selection, social selection or species recognition?

2010 ◽  
Vol 283 (1) ◽  
pp. 3-17 ◽  
Author(s):  
K. Padian ◽  
J. R. Horner
Keyword(s):  
Sexual Selection ◽  
Species Recognition ◽  
Social Selection

scholarly journals The evolution of female sex pheromones

2013 ◽  
Vol 59 (4) ◽  
pp. 569-578 ◽  
Author(s):  
Ally R. Harari ◽  
Hadass Steinitz
Keyword(s):  
Sexual Selection ◽  
Natural Selection ◽  
Sex Pheromones ◽  
Species Recognition ◽  
Current Evidence ◽  
Social Selection ◽  
Breeding Sites ◽  
Female Sex ◽  
Breeding Resources

Abstract The role of female sex pheromones in natural selection, particularly as a means for species recognition to avoid the generation of hybrid offspring with low fitness, has been widely explored and is generally accepted by scholars. However, the significance of sex pheromones in shaping mate choice (sexual selection) and in competition over breeding resources (social selection) has been largely ignored. The effect of sexual selection on sex pheromones as a sexually dimorphic signaling trait has been discounted because the amount of pheromone released by females is typically minute, while the role of sex pheromones in competition over breeding resources (other than mates) has not yet been considered. As a result of natural selection, variation in sex pheromones among females is expected to be low, and males are not expected to choose their mates among phero-mone-releasing conspecific females. Sexual selection, on the other hand, should drive the increase in pheromone variance among females, and males are expected to choose females based on this variation. Moreover, social selection resulting from more general social interactions, for example competition among females for breeding sites and food, should also promote variance among female sex pheromones. Here, we review the current evidence for each of the three selection processes acting on sex pheromones of female moths as an advertising trait. We suggest that the three selection types are not mutually exclusive but rather act together to promote different fitness components in diverse ecological situations.

scholarly journals Sexual selection is a form of social selection

2012 ◽  
Vol 367 (1600) ◽  
pp. 2266-2273 ◽  
Author(s):  
Bruce E. Lyon ◽  
Robert Montgomerie
Keyword(s):  
Sexual Selection ◽  
Social Interactions ◽  
Social Selection ◽  
Reproductive Competition ◽  
Selection Theory ◽  
Males And Females ◽  
Female Roles ◽  
Comprehensive Framework ◽  
Natural And Sexual Selection ◽  
Lines Of Evidence

Social selection influences the evolution of weapons, ornaments and behaviour in both males and females. Thus, social interactions in both sexual and non-sexual contexts can have a powerful influence on the evolution of traits that would otherwise appear to be detrimental to survival. Although clearly outlined by West-Eberhard in the early 1980s, the idea that social selection is a comprehensive framework for the study of ornaments and weapons has largely been ignored. In West-Eberhard's view, sexual selection is a form of social selection—a concept supported by several lines of evidence. Darwin's distinction between natural and sexual selection has been useful, but recent confusion about the limits of sexual selection suggests that some traits are not easily categorized as naturally or sexually selected. Because social selection theory has much to offer the current debates about both sexual selection and reproductive competition in females, it is sometimes viewed, narrowly, to be most useful when considering female roles. However, social selection theory encompasses much more than female reproductive competition. Our goal here was to provide that broader perspective.

scholarly journals The social selection alternative to sexual selection

2012 ◽  
Vol 367 (1600) ◽  
pp. 2294-2303 ◽  
Author(s):  
Joan Roughgarden
Keyword(s):  
Sexual Selection ◽  
Gene Pool ◽  
Optimal Allocation ◽  
Social Selection ◽  
Individual Selection ◽  
Direct Benefit ◽  
Offspring Production ◽  
The Social ◽  
Multi Level ◽  
Behavioural Dynamics

Social selection offers an alternative to sexual selection by reversing its logic. Social selection starts with offspring production and works back to mating, and starts with behavioural dynamics and works up to gene pool dynamics. In social selection, courtship can potentially be deduced as a negotiation, leading to an optimal allocation of tasks during offspring rearing. Ornaments facilitate this negotiation and also comprise ‘admission tickets’ to cliques. Mating pairs may form ‘teams’ based on the reciprocal sharing of pleasure. The parent–offspring relation can be managed by the parent considered as the owner of a ‘family firm’ whose product is offspring. The cooperation in reproductive social behaviour evolves as a mutual direct benefit through individual selection rather than as some form of altruism requiring kin or multi-level selection.

scholarly journals Sexual selection drives the evolution of wing interference patterns

2018 ◽  
Author(s):  
MF Hawkes ◽  
E Duffy ◽  
R Joag ◽  
A Skeats ◽  
J Radwan ◽  
...  
Keyword(s):  
Sexual Selection ◽  
Digital Imaging ◽  
Colour Vision ◽  
Species Recognition ◽  
Sexual Attractiveness ◽  
Courtship Display ◽  
Structural Coloration ◽  
Male And Female ◽  
Selection For ◽  
First Time

AbstractThe seemingly transparent wings of many insects have recently been found to display dramatic structural coloration. These structural colours (wing interference patterns: WIPs) may be involved in species recognition and mate choice, yet little is known about the evolutionary processes that shape them. Additionally, existing research has been restricted by analysing WIPs without due consideration of how they are actually perceived by the viewers’ colour vision. Here, we use multispectral digital imaging and a model ofDrosophilavision to compare WIPs of male and femaleDrosophila simulansfrom replicate populations forced to evolve with or without sexual selection for 68 generations. We show for the first time that WIPs modelled inDrosophilavision evolve in response to sexual selection, and confirm that WIPs correlate with male sexual attractiveness. These findings add a new element to the otherwise well describedDrosophilacourtship display and confirm that wing colours evolve through sexual selection.

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