Tuning in to the male: evidence contradicting sexually antagonistic coevolution models of sexual selection in Leucauge mariana (Araneae Tetragnathidae)

2019 ◽  
Vol 32 (2) ◽  
pp. 175-189
Author(s):  
Laura Segura-Hernández ◽  
Anita Aisenberg ◽  
Eric Vargas ◽  
Linda Hernández-Durán ◽  
William G. Eberhard ◽  
...  
Keyword(s):  
Sexual Selection ◽  
Antagonistic Coevolution ◽  
Sexually Antagonistic Coevolution

Sexual selection affects the evolution of contact pheromones in Drosophila melanogaster populations isolated by differential sexual conflict

2019 ◽  
Author(s):  
Rochishnu Dutta ◽  
Tejinder Singh Chechi ◽  
N. G. Prasad
Keyword(s):  
Drosophila Melanogaster ◽  
Sexual Selection ◽  
Reproductive Isolation ◽  
Sexual Conflict ◽  
Population Differentiation ◽  
Lipid Profiles ◽  
Mate Preference ◽  
Cuticular Lipid ◽  
Antagonistic Coevolution ◽  
Sexually Antagonistic Coevolution

Abstract Background: The ability of sexual conflict to facilitate reproductive isolation is widely anticipated. However, very few experimental evolutionary studies have convincingly demonstrated the evolution of reproductive isolation due to sexual conflict. Recently a study on the replicates of Drosophila melanogaster populations under differential sexual conflict found that divergent mate preference evolved among replicates under high sexual conflict regime. The precopulatory isolating mechanism underlying such divergent mate preference could be sexual signals such as cuticular lipids since they evolve rapidly and are involved in D. melanogaster mate recognition. Using Drosophila melanogaster replicates used in the previous study, we investigate whether cuticular lipid divergence bears signatures of sexually antagonistic coevolution that led to reproductive isolation among replicates of high sexual conflict regime. Results: We found that their cuticular lipid profiles are sexually dimorphic. Although replicates with male biased sex ratio evolved isolation in reproductive traits due to high sexual conflict, the patterns of cuticular lipid divergence in high and low sexual conflict regimes suggest that sexual selection is the dominant selection pressure rather than sexual conflict affecting the cuticular lipid profile. We also find cuticular lipid divergence patterns to be suggestive of the Buridan’s Ass regime which is one of the six possible mechanism to resolve sexual conflict. Conclusions: Although reproductive isolation due to sexual conflict is anticipated, evolution of a sexually selected trait under sexual conflict may not lead to population differentiation in expected lines. This is because speciation due to sexually antagonistic coevolution is only one of the several outcomes of sexual conflict. This study indicates that population differentiation as a result of cuticular lipid divergence cannot be credited to sexual conflict despite high sexual conflict regime evolving divergent cuticular lipid profiles.

scholarly journals Does reproductive isolation evolve faster in larger populations via sexually antagonistic coevolution?

2009 ◽  
Vol 5 (5) ◽  
pp. 693-696 ◽  
Author(s):  
L. Gay ◽  
P.E. Eady ◽  
R. Vasudev ◽  
D.J. Hosken ◽  
T. Tregenza
Keyword(s):  
Genetic Variation ◽  
Sexual Selection ◽  
Genetic Variability ◽  
Reproductive Isolation ◽  
Sexual Conflict ◽  
Callosobruchus Maculatus ◽  
Reproductive Investment ◽  
Antagonistic Coevolution ◽  
Large Populations ◽  
Sexually Antagonistic Coevolution

Sexual conflict over reproductive investment can lead to sexually antagonistic coevolution and reproductive isolation. It has been suggested that, unlike most models of allopatric speciation, the evolution of reproductive isolation through sexually antagonistic coevolution will occur faster in large populations as these harbour greater levels of standing genetic variation, receive larger numbers of mutations and experience more intense sexual selection. We tested this in bruchid beetle populations ( Callosobruchus maculatus ) by manipulating population size and standing genetic variability in replicated lines derived from founders that had been released from sexual conflict for 90 generations. We found that after 19 generations of reintroduced sexual conflict, none of our treatments had evolved significant overall reproductive isolation among replicate lines. However, as predicted, measures of reproductive isolation tended to be greater among larger populations. We discuss our methodology, arguing that reproductive isolation is best examined by performing a matrix of allopatric and sympatric crosses whereas measurement of divergence requires crosses with a tester line.

scholarly journals Quantifying the gender load: can population crosses reveal interlocus sexual conflict?

2006 ◽  
Vol 361 (1466) ◽  
pp. 363-374 ◽  
Author(s):  
Tristan A.F Long ◽  
Robert Montgomerie ◽  
Adam K Chippindale
Keyword(s):  
Sperm Competition ◽  
Sexual Conflict ◽  
Population Differentiation ◽  
Population Divergence ◽  
Mating Frequency ◽  
Female Reproduction ◽  
Female Fitness ◽  
Antagonistic Coevolution ◽  
The Cost ◽  
Sexually Antagonistic Coevolution

Six sister populations of Drosophila melanogaster kept under identical environmental conditions for greater than 600 generations were reciprocally crossed to investigate the incidence of population divergence in allopatry. Population crosses directly influenced fitness, mating frequency, and sperm competition patterns. Changes in both female remating rate and the outcome of male sperm competition (P 1 , P 2 ) in response to foreign males were consistent with intersexual coevolution. Moreover, seven of the 30 crosses between foreign mates resulted in significant reductions in female fitness, whereas two resulted in significant increases, compared to local matings. This tendency for foreign males to reduce female fitness may be interpreted as evidence for either sexually antagonistic coevolution or the disruption of mutualistic interactions. However, instances in which female fitness improved via cohabitation with foreign males may better reveal sexual conflict, signalling release from the cost of interacting with locally adapted males. By this metric, female reproduction in D. melanogaster is strongly constrained by local adaptation by males, a situation that would promote antagonistic coevolution between the sexes. We conclude that sexual selection can promote population differentiation in allopatry and that sexual conflict is likely to have played a role in population differentiation in this study system.

scholarly journals The evolution of asymmetric genitalia in Coleoptera

2016 ◽  
Vol 371 (1710) ◽  
pp. 20150400 ◽  
Author(s):  
Menno Schilthuizen ◽  
Paulien de Jong ◽  
Rick van Beek ◽  
Tamara Hoogenboom ◽  
Melanie Meijer zu Schlochtern
Keyword(s):  
Female Choice ◽  
Male Genitalia ◽  
Diverse Group ◽  
Median Lobe ◽  
Animal Kingdom ◽  
Antagonistic Coevolution ◽  
Informal Assessment ◽  
Left Right Asymmetry ◽  
Sexually Antagonistic Coevolution ◽  
Male Genital

The evolution of asymmetry in male genitalia is a pervasive and recurrent phenomenon across almost the entire animal kingdom. Although in some taxa the asymmetry may be a response to the evolution of one-sided, male-above copulation from a more ancestral female-above condition, in other taxa, such as Mammalia and Coleoptera, this explanation appears insufficient. We carried out an informal assessment of genital asymmetry across the Coleoptera and found that male genital asymmetry is present in 43% of all beetle families, and at all within-family taxonomic levels. In the most diverse group, Cucujiformia, however, genital asymmetry is comparatively rare. We also reconstructed the phylogeny of the leiodid tribe Cholevini, and mapped aspects of genital asymmetry on the tree, revealing that endophallus sclerites, endophallus, median lobe and parameres are, in a nested fashion, increasingly unlikely to have evolved asymmetry. We interpret these results in the light of cryptic female choice versus sexually antagonistic coevolution and advocate further ways in which the phenomenon may be better understood. This article is part of the themed issue ‘Provocative questions in left–right asymmetry’.

SEXUAL CONFLICT AND SEXUAL SELECTION: MEASURING ANTAGONISTIC COEVOLUTION

Evolution ◽  
2004 ◽  
Vol 58 (6) ◽  
pp. 1389 ◽  
Author(s):  
Tommaso Pizzari ◽  
Rhonda R. Snook
Keyword(s):  
Sexual Selection ◽  
Sexual Conflict ◽  
Antagonistic Coevolution
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