Genotype‐by‐Environment Interactions and Sexual Selection in Guppies

Kolluru, Gita R.

doi:10.1002/9781118912591.ch12

Cited by 11 publications

(13 citation statements)

References 164 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As a consequence, both the direction and magnitude of sexual selection in males could change (Candolin and Heuschele ; Ingleby et al. ; Kolluru ). Another possibility is that female choice itself is condition dependent (Hunt et al.…”

Section: Discussionmentioning

confidence: 99%

“…For example, if male signals vary unpredictably with the environment, female choice for "good genes" may be disrupted in novel environments (Holman and Kokko 2014). As a consequence, both the direction and magnitude of sexual selection in males could change (Candolin and Heuschele 2008;Ingleby et al 2010;Kolluru 2014). Another possibility is that female choice itself is condition dependent (Hunt et al 2005;Cotton et al 2006), resulting in reduced female choosiness and relaxed intersexual selection on males in maladapted populations.…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

The consequences of sexual selection in well-adapted and maladapted populations of bean beetles†

et al. 2018

View full text Add to dashboard Cite

Whether sexual selection generally promotes or impedes population persistence remains an open question. Intralocus sexual conflict (IaSC) can render sexual selection in males detrimental to the population by increasing the frequency of alleles with positive effects on male reproductive success but negative effects on female fecundity. Recent modeling based on fitness landscape theory, however, indicates that the relative impact of IaSC may be reduced in maladapted populations and that sexual selection therefore might promote adaptation when it is most needed. Here, we test this prediction using bean beetles that had undergone 80 generations of experimental evolution on two alternative host plants. We isolated and assessed the effect of maladaptation on sex-specific strengths of selection and IaSC by cross-rearing the two experimental evolution regimes on the alternative hosts and estimating within-population genetic (co)variance for fitness in males and females. Two key predictions were upheld: males generally experienced stronger selection compared to females and maladaptation increased selection in females. However, maladaptation consistently decreased male-bias in the strength of selection and IaSC was not reduced in maladapted populations. These findings imply that sexual selection can be disrupted in stressful environmental conditions, thus reducing one of the potential benefits of sexual reproduction in maladapted populations.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

The consequences of sexual selection in well-adapted and maladapted populations of bean beetles†

et al. 2018

View full text Add to dashboard Cite

show abstract

“…Recent evidence from guppies reveals that traits subject to precopulatory (colour ornamentation and behaviour) and post‐copulatory sexual selection (ejaculate traits) are highly sensitive to changes in diet quantity and quality (Devigili et al ., ; Rahman et al ., , ). Indeed, there is abundant evidence that the availability of resources such as diet, among other sources of environmental variation, influences the expression of sexually selected traits in guppies (Kolluru, ). Until now, however, there has been limited support for the presence of GEI through resource limitation for sexual ornamentation in guppies (Kolluru, ), and to our knowledge, there are no tests for GEIs in any context for post‐copulatory traits in guppies.…”

Section: Introductionmentioning

confidence: 99%

Genotype‐by‐environment interactions underlie the expression of pre‐ and post‐copulatory sexually selected traits in guppies

Evans¹,

Rahman²,

Gasparini³

2015

J of Evolutionary Biology

View full text Add to dashboard Cite

The role that genotype-by-environment interactions (GEIs) play in sexual selection has only recently attracted the attention of evolutionary biologists. Yet GEIs can have profound evolutionary implications by compromising the honesty of sexual signals, maintaining high levels of genetic variance underlying their expression and altering the patterns of genetic covariance among fitness traits. In this study, we test for GEIs in a highly sexually dimorphic freshwater fish, the guppy Poecilia reticulata. We conducted an experimental quantitative genetic study in which male offspring arising from a paternal half-sibling breeding design were assigned to differing nutritional 'environments' (either high or low feed levels). We then determined whether the manipulation of diet quantity influenced levels of additive genetic variance and covariance for several highly variable and condition-dependent pre- and post-copulatory sexual traits. In accordance with previous work, we found that dietary limitation had strong phenotypic effects on numerous pre- and post-copulatory sexual traits. We also report evidence for significant GEI for several of these traits, which in some cases (area of iridescence and sperm velocity) reflected a change in the rank order of genotypes across different nutritional environments (i.e. ecological crossover). Furthermore, we show that genetic correlations vary significantly between nutritional environments. Notably, a highly significant negative genetic correlation between iridescent coloration and sperm viability in the high food treatment broke down under dietary restriction. Taken together, these findings are likely to have important evolutionary implications for guppies; ecological crossover may influence sexual signal reliability in unstable (nutritional) environments and contribute towards the extreme levels of polymorphism in sexual traits typically reported for this species. Furthermore, the presence of environment-specific genetic covariance suggests that trade-offs measured in one environment may not be indicative of genetic constraints in others.

show abstract

“…Poeciliid fishes are model systems for studying sexually selected traits (Meffe & Snelson 1989;Houde 1997;Pollux et al 2009;Evans et al 2011;Kolluru 2014), yet many species have not been studied in detail (Endler 2011). Using the black morph of the endemic Cuban species G. metallicus, we demonstrated a correlation between female preference in dichotomous choice tests and male-male aggression in the open arena, suggesting that females are able to distinguish males who will subsequently be successful at aggressive competition.…”

Section: Discussionmentioning

confidence: 99%

Sexual Selection in Black Morph Girardinus metallicus (Pisces: Poeciliidae): Females Can Spot a Winner (But We Cannot)

et al. 2015

Self Cite

View full text Add to dashboard Cite

Male–male competition may interfere with the ability of females to choose mates by interrupting courtship or by favoring highly aggressive males who may damage females during mating attempts. Alternatively, females may benefit by mating with dominant males, and female choice and male–male competition may therefore act in unison. The same traits, including aggressiveness, may indicate male quality to females and to rivals. We investigated sexual selection in the black morph of the endemic Cuban poeciliid fish, Girardinus metallicus, to ascertain the links between morphological and behavioral traits and success in intra‐ and intersexual selection. Males conspicuously exhibit their black ventral surface and gonopodium to females during courtship. Dichotomous choice tests revealed female association preferences for certain males, and those same males were more successful in monopolizing access to females when the fish were allowed to directly interact. Dominant males followed, courted, and copulated with females more than subordinate males within a pair, and it appears that females could either assess dominance based on cues we did not measure, or could influence subsequent mating success by their behavior during the dichotomous choice trials. There was an interaction between black status (i.e., whether the male in each pair had more or less ventral black coloration than the other male in that pair) and dominance, such that low‐black dominant males courted early and then shifted to following females, whereas high‐black dominant males courted far more later in the observation period. These results hint at the importance for sexual selection of the interplay between a static morphological trait (black coloration) and a dynamic behavioral trait (aggressiveness), but the functional significance of the courtship display remains a mystery.

show abstract

Genotype‐by‐Environment Interactions and Sexual Selection in Guppies

Cited by 11 publications

References 164 publications

The consequences of sexual selection in well-adapted and maladapted populations of bean beetles†

The consequences of sexual selection in well-adapted and maladapted populations of bean beetles†

Genotype‐by‐environment interactions underlie the expression of pre‐ and post‐copulatory sexually selected traits in guppies

Sexual Selection in Black Morph Girardinus metallicus (Pisces: Poeciliidae): Females Can Spot a Winner (But We Cannot)

Contact Info

Product

Resources

About