Parental Investment and Sexual Selection
... attract or arouse females. The 21 per cent who failed to reproduce showed no disinterest in trying to copulate, only an inability to be accepted. (3) A female's reproductive success did not increase much, if any, after the first copulation and not at all after the second; most females were uninteres ...
... attract or arouse females. The 21 per cent who failed to reproduce showed no disinterest in trying to copulate, only an inability to be accepted. (3) A female's reproductive success did not increase much, if any, after the first copulation and not at all after the second; most females were uninteres ...
Host-shift effects on mating behavior and
... experimental beetles completed their larval development on bean, we denoted this experimental group as Pp group. In the next step, we assumed that the environment of these populations became heterogeneous by introducing seeds of a novel host plant, that is, chickpea. This scenario is highly probable ...
... experimental beetles completed their larval development on bean, we denoted this experimental group as Pp group. In the next step, we assumed that the environment of these populations became heterogeneous by introducing seeds of a novel host plant, that is, chickpea. This scenario is highly probable ...
The mitonuclear compatibility hypothesis of sexual selection
... train of a peacock, the cumbersome antlers of an elk and the conspicuous red coloration of a cardinal evolve? Biologists now accept that the primary force for the evolution of many such display traits in male animals is the benefit of mate attraction [1–3]. There remains, however, the bigger questio ...
... train of a peacock, the cumbersome antlers of an elk and the conspicuous red coloration of a cardinal evolve? Biologists now accept that the primary force for the evolution of many such display traits in male animals is the benefit of mate attraction [1–3]. There remains, however, the bigger questio ...
The limits of sexual conflict in the narrow sense
... passive mate choice and/or the establishment of a pair bond; and (ii) aversion or resistance to forced or coercive copulation and fertilization that result from male – male competition. An obvious consequence of the narrow sense equivalence of resistance and preference is that autonomous mate choice ...
... passive mate choice and/or the establishment of a pair bond; and (ii) aversion or resistance to forced or coercive copulation and fertilization that result from male – male competition. An obvious consequence of the narrow sense equivalence of resistance and preference is that autonomous mate choice ...
Sensory exploitation and sexual conflict
... variation among males in the direct effects they have on female fitness. I will refer to this here as a Darwinian origin. This is a less problematic hypothesis than that suggested by Fisher (1930), since it does not rely on standing genetic variation in the breeding value for fitness among males. Fo ...
... variation among males in the direct effects they have on female fitness. I will refer to this here as a Darwinian origin. This is a less problematic hypothesis than that suggested by Fisher (1930), since it does not rely on standing genetic variation in the breeding value for fitness among males. Fo ...
Necksforsex or competing browsers? A critique of ideas on the
... isometry, not positive allometry, because it lies close to 1.00 and within confidence limits from the Namibian dataset; thus the two populations probably do not differ significantly. Mitchell et al. (2009) appear to have misinterpreted this result, and their data therefore support the idea that female ...
... isometry, not positive allometry, because it lies close to 1.00 and within confidence limits from the Namibian dataset; thus the two populations probably do not differ significantly. Mitchell et al. (2009) appear to have misinterpreted this result, and their data therefore support the idea that female ...
The sociobiology of sex: inclusive fitness consequences of inter
... Figure 1. Sexual conflict and mutual benefits. Conflict: (a) in experimental populations of viviparous lizards, Lacerta vivipara, male sexual harassment can be so costly to females as to drive populations to local extinctions [32]. Photo credit: P. S. Fitze. (b) The accessory gland products (Acp) re ...
... Figure 1. Sexual conflict and mutual benefits. Conflict: (a) in experimental populations of viviparous lizards, Lacerta vivipara, male sexual harassment can be so costly to females as to drive populations to local extinctions [32]. Photo credit: P. S. Fitze. (b) The accessory gland products (Acp) re ...
Sexual Communication with Pheromones Ring T. Card6 and
... sexual recruitment are the moths (Lepidoptera), many Coleoptera, Hymenoptera, Orthoptera, Diptera and Hornoptera. In these groups, females are predominantly the emitters and males the receivers. Hence, the reduction in spacing is due primarily to chemically mediated movements of males. Where attract ...
... sexual recruitment are the moths (Lepidoptera), many Coleoptera, Hymenoptera, Orthoptera, Diptera and Hornoptera. In these groups, females are predominantly the emitters and males the receivers. Hence, the reduction in spacing is due primarily to chemically mediated movements of males. Where attract ...
Demography can favour female
... which control the dispersal propensity and are expressed in females only (df ) or males only (dm). We assume co-dominance for each of the three diploid loci, such that phenotypes are the mean of the relevant allelic values. When each simulation commences, individuals are assigned values of a that ma ...
... which control the dispersal propensity and are expressed in females only (df ) or males only (dm). We assume co-dominance for each of the three diploid loci, such that phenotypes are the mean of the relevant allelic values. When each simulation commences, individuals are assigned values of a that ma ...
Polyandry and alternative mating tactics
... Many species in the animal kingdom are characterized by alternative mating tactics (AMTs) within a sex [1–3]. For example, males within a species may use different behaviours to attract or otherwise mate with females. In the mating system of the ruff (Philomachus pugnax), as one well-studied example ...
... Many species in the animal kingdom are characterized by alternative mating tactics (AMTs) within a sex [1–3]. For example, males within a species may use different behaviours to attract or otherwise mate with females. In the mating system of the ruff (Philomachus pugnax), as one well-studied example ...
Male mating success and survival in the field with respect to size
... It has been suggested that the proportions of copulating and solitary males can be used to estimate the variance in male mating success (e.g., Arnold and Wade, 1984b). However, in our case the males were scanned only once. Since even the most attractive can not be in copula constantly, this approach ...
... It has been suggested that the proportions of copulating and solitary males can be used to estimate the variance in male mating success (e.g., Arnold and Wade, 1984b). However, in our case the males were scanned only once. Since even the most attractive can not be in copula constantly, this approach ...
Maternal sexual interactions affect offspring survival and ageing
... evolutionary trajectories under sexual selection. A longstanding conundrum for evolutionary biologists is an explanation for why the females of so many species mate multiply within a given reproductive bout (i.e. polyandrously). On the one hand, polyandry might evolve adaptively if females garner di ...
... evolutionary trajectories under sexual selection. A longstanding conundrum for evolutionary biologists is an explanation for why the females of so many species mate multiply within a given reproductive bout (i.e. polyandrously). On the one hand, polyandry might evolve adaptively if females garner di ...
Local adaptation and the evolution of female choice
... receives nothing but genes (‘indirect benefits’) from their mates. Indirect benefits are predicted to be meagre because persistent female choice depletes genetic variation in the male traits under sexual selection (the lek paradox; e.g. Borgia, 1979, Rowe and Houle, 1996). The lek paradox is especia ...
... receives nothing but genes (‘indirect benefits’) from their mates. Indirect benefits are predicted to be meagre because persistent female choice depletes genetic variation in the male traits under sexual selection (the lek paradox; e.g. Borgia, 1979, Rowe and Houle, 1996). The lek paradox is especia ...
POPULATION GENETIC THEORY OF THE ASSORTATIVE MATING
... roughly constant mating advantage to the preferred males: the female preference for a particular phenotype is expressed only by females who possess that phenotype; hence it is expressed in strict proportion to the frequencies of the males preferred, thus giving them a constant mating advantage. But ...
... roughly constant mating advantage to the preferred males: the female preference for a particular phenotype is expressed only by females who possess that phenotype; hence it is expressed in strict proportion to the frequencies of the males preferred, thus giving them a constant mating advantage. But ...
the evolutionary ecology of gynogenesis
... The evolution and maintenance of sexual reproduction is still one of the major unresolved problems in evolutionary biology (Redfield 1994, West et al. 1999). Once evolved, recombination must persist against invading asexuals (Doncaster et al. 2000), which do not show meiosis and recombination. Durin ...
... The evolution and maintenance of sexual reproduction is still one of the major unresolved problems in evolutionary biology (Redfield 1994, West et al. 1999). Once evolved, recombination must persist against invading asexuals (Doncaster et al. 2000), which do not show meiosis and recombination. Durin ...
Male genital size - Craig Layman Lab
... evaluate female mating preferences in poeciliid fishes and offers the advantage that male traits can be digitally altered to test effects of one trait while holding all other traits constant (40–42). We produced the videos by recording a displaying male (lateral display where the male lowers the gon ...
... evaluate female mating preferences in poeciliid fishes and offers the advantage that male traits can be digitally altered to test effects of one trait while holding all other traits constant (40–42). We produced the videos by recording a displaying male (lateral display where the male lowers the gon ...
Sexual Size Dimorphism, Diet, and Reproduction in the Mexican
... have evolved in many animal groups as insects, fishes, amphibians, reptiles and birds, and efforts to understand the ecological and evolutionary significance of sexual dimorphism have focused on adaptive significance and physiological mechanisms (Andersson 1994). Particular interest has been given t ...
... have evolved in many animal groups as insects, fishes, amphibians, reptiles and birds, and efforts to understand the ecological and evolutionary significance of sexual dimorphism have focused on adaptive significance and physiological mechanisms (Andersson 1994). Particular interest has been given t ...
correlated evolution of male and female morphologies in
... Abstract. Sexually antagonistic coevolution may be an important force in the evolution of sexual dimorphism. We undertake a comparative study of correlated evolution of male and female morphologies in a clade of 15 water strider species in the genus Gerris (Heteroptera: Gerridae). Earlier studies ha ...
... Abstract. Sexually antagonistic coevolution may be an important force in the evolution of sexual dimorphism. We undertake a comparative study of correlated evolution of male and female morphologies in a clade of 15 water strider species in the genus Gerris (Heteroptera: Gerridae). Earlier studies ha ...
Positive feedback in the transition from sexual reproduction to
... considerable standing genetic variation for tychoparthenogenetic ability. Obligate parthenogenesis could thus evolve gradually from tychoparthenogenesis if selection favoured an increase in the proportion of tychoparthenogenetic eggs. However, with such a low initial rate of tychoparthenogenesis, it ...
... considerable standing genetic variation for tychoparthenogenetic ability. Obligate parthenogenesis could thus evolve gradually from tychoparthenogenesis if selection favoured an increase in the proportion of tychoparthenogenetic eggs. However, with such a low initial rate of tychoparthenogenesis, it ...
The cost of males in non-equilibrium populations
... Hence the conclusions are restricted to mechanisms for sex that operate on that time scale. As parasite generation times can be much faster than host generation times, host–parasite co-evolution stands as a possible mechanism to favour host sex, especially in K-selected species. However, the model i ...
... Hence the conclusions are restricted to mechanisms for sex that operate on that time scale. As parasite generation times can be much faster than host generation times, host–parasite co-evolution stands as a possible mechanism to favour host sex, especially in K-selected species. However, the model i ...
Sexual Selection
... - WHY is it ADAPTIVE for the FEMALE to choose a SHOWY MALE?? 1. Direct Benefit - Scorpion fly males bring a 'nuptual gift'... the one with the biggest gift is accepted by the female (who gets this extra energy to make eggs). ...
... - WHY is it ADAPTIVE for the FEMALE to choose a SHOWY MALE?? 1. Direct Benefit - Scorpion fly males bring a 'nuptual gift'... the one with the biggest gift is accepted by the female (who gets this extra energy to make eggs). ...
Mating Systems and Sexual Selection in Male
... no doubt will be discovered, but for now, three groups stand out as most promising for continued study of sexual selection. In katydids (family Tettigonidae), the male invests in progeny by transferring an edible spermatophylax to the female during copulation ( Brown and Gwynne 1997). Populations an ...
... no doubt will be discovered, but for now, three groups stand out as most promising for continued study of sexual selection. In katydids (family Tettigonidae), the male invests in progeny by transferring an edible spermatophylax to the female during copulation ( Brown and Gwynne 1997). Populations an ...
STRONGER CONVEX (STABILIZING) SELECTION ON
... et al. 2006; Servedio and Lande 2006; Servedio 2007; Rowell and Servedio 2009). The often extreme variation in female fecundity that exists in many species suggests that adaptive male choice for females of high fecundity may be key (Bonduriansky 2001). Consistent with this, male mate choice appears ...
... et al. 2006; Servedio and Lande 2006; Servedio 2007; Rowell and Servedio 2009). The often extreme variation in female fecundity that exists in many species suggests that adaptive male choice for females of high fecundity may be key (Bonduriansky 2001). Consistent with this, male mate choice appears ...
Age-advertisement and the evolution of the peacock`s train
... the blue peacock (Pauo cristatus) with its long covert feathers, most of which end in vividly coloured ocelli. Such structures are probably costly, so how did they evolve? There are four possible answers which invoke female preference for male ornaments. Firstly, if there are some choosy females in ...
... the blue peacock (Pauo cristatus) with its long covert feathers, most of which end in vividly coloured ocelli. Such structures are probably costly, so how did they evolve? There are four possible answers which invoke female preference for male ornaments. Firstly, if there are some choosy females in ...