2 edition of Sexual selection and the evolution of genitalia in the guppy (Poecilia reticulata). found in the catalog.
Sexual selection and the evolution of genitalia in the guppy (Poecilia reticulata).
Yun Yun Cheng
Written in English
In many taxa with internal fertilization and multiple-mating, male genitalia exhibit remarkable diversity among closely related species. In this thesis I examine genitalic variation and genitalic function in a model organism for the study of sexual selection, the guppy. I ask whether guppies from different populations vary in their genitalic structures, whether this variation is associated with the level of predation risk in a population, and how the genitalic claw functions. In Chapter 2, I present evidence of inter-population variation in genitalic traits and its association with predation regime. In Chapter 3, I show that the claw is not necessary for sperm transfer and that it may instead be advantageous in matings with unreceptive females, thus suggesting a sexual conflict function. In Chapter 4, I provide evidence that the claw does not function to stimulate females into biasing fertilization success, suggesting that the claws are not favoured by cryptic female choice.
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Introduction. Static allometry describes the change in the relative size of a trait compared to the rest of the body for individuals of the same species, measured at similar developmental stage (Gould, ).It is classically described by a power relationship: y = ax b, where y is the size of the trait of interest, and x is the body size (Huxley, ).Cited by: Description: Evolution, published for the Society for the Study of Evolution, is the premier publication devoted to the study of organic evolution and the integration of the various fields of science concerned with journal presents significant and original results that extend our understanding of evolutionary phenomena and processes.
Cryptic female choice (CFC) represents postmating intersexual selection arising from female-driven mechanisms at or after mating that bias sperm use and impact male paternity share. Although biologists began to study CFC relatively late, largely spurred by Eberhard’s book published 20 years ago, the field has grown rapidly since by: Alexander Kotrschal. group leader. I am a Biologist with a strong interest in both Animal Behaviour and Evolution. My topics range from phenotypic plasticity of behaviour and physiology to the evolution of brain size and cognitive ability.
of Sexual Conflict Judith E. Mank, David J. Hosken, and Nina Wedell ORIGINAL ARTICLES Sex-Dependent Selection Differentially Shapes Genetic Variation on and off the Guppy Y Chromosome Erik Postma, Nicolle Spyrou, Lee Ann Rollins, and Robert С Brooks Adaptive Chromosomal Divergence Driven by Mixed Geographic Mode of Evolution. A Potential Cost of Long Genitalia in Male Guppies: the Effects of Current Speed on Reproductive Behaviour. Ethology /eth Kwan L, Fris M, Rodd FH, Rowe L, Tuhela L and Panhuis T.
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Sexual selection is a mode of natural selection in which members of one biological sex choose mates of the other sex to mate with (intersexual selection), and compete with members of the same sex for access to members of the opposite sex (intrasexual selection).
These two forms of selection mean that some individuals have better reproductive success than others within a. Genitalia are among the most variable morphological structures in nature (Eberhard, ). Both natural and sexual selection can influence variation in genitalia, but sexual selection is generally.
Eberhard et al. () suggested that this is due to sexual selection favoring an intermediate male genitalia size that is capable of stimulating most females in the reproduc- tive population.
Sexual size dimorphism is a frequent phenomenon where the size of males and females of the same species differ (see Figure 2), driven by one or more of the mechanisms mentioned these processes occur in closely related species, distinct patterns of among-species size dimorphism can result, one of which is termed ‘Rensch’s Rule’ .Cited by: 9.
Posts about sexual selection written by tomhouslay. I’m going to skip ahead in my review of the talks which I enjoyed at Evolution in Ottawa, as Doug Emlen‘s latest research has just been published in the latest issue of the prestigious journal Science.
This gives me an excuse to write about his talk and the new paper, as well as to engage in gratuitous posting of. These include the mistaken ideas that sexual selection: (1) always produces sex differences, (2) does not operate in monogamous species, (3) is weaker than natural selection, and (4) had nothing to do with the evolution of human intelligence, language, or creativity.
Sexual coercion in animals is the use of violence, threats, harassment, and other tactics to help them forcefully copulate. Such behavior has been compared to sexual assault, including rape, among humans. In nature, males and females usually differ in reproductive fitness optima.
Males generally prefer to maximize their number of offspring, and therefore their number of mates. - Here we will treat female choice, while keeping in mind that Darwin knew that in some systems mirror-image processes could occur through male.
Dec 2, - According to this argument, the mate selection rules are dictated by the roles that women and men occupy in society. Thus, people's preferences. The sexual selection world challenges the popular misconception that evolution is blind and dumb. In fact, as Darwin emphasized, sexual selection is often perceptive and clever, because animal senses and brains mediate mate by: 2.
Oct 7, - Explore xajieda's board "Sexual selection" on Pinterest. See more ideas about Pet birds, Animals and Animals beautiful pins.
Darwin examined sexual dimorphism in animals, arguing that sexual selection was important in the evolution of such dimorphism. Sexual dimorphism in plants may have parallel causes and costs. The processes that contribute to sexual dimorphism may also lead to speciation and morphological differences among related species, as argued originally by by: Social facilitation of male sexual behavior, intrasexual competition, and sexual selection in the guppy, Poecilia reticulata (Pisces, Poeciliidae).
Evolution – Evolution – CrossRef Google ScholarCited by: Darwin outlined his thoughts on the evolution of male traits for enhancing reproductive success in ‘On the Origin of Species’; he then detailed it thoroughly in ’s ‘Selection in Relation to Sex’, which was published alongside ‘The Descent of Man’ (criminally, some people still prefer to read the book on human evolution, which.
Sexual selection: the importance of mutual mate choice. Although the observation of change in form through time, or evolution, had been commented on, Darwin provided the first plausible mechanism through which evolution could be achieved, namely natural by: Sexual Selection and Animal Genitalia: Eberhard, William G.
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Sexual Selection by Female Choice in Polygynous Animals Sexual Selection by Female Choice in Polygynous Animals Kirkpatrick, M Darwin's theory of organic evolution identifies two fonns of selection that occur in the wild: natural selection, involving the adaptation of a population to its biotic and abiotic environment, and sexual selection, resulting from comÂ.
be each of the mechanisms of evolution and use real examples from nature to illustrate them. t which organisms are most fit, evolutionarily speaking, given life history data. e and contrast the different species concepts. how exaptation and evo-devo can cause "fast evolution". ate the process of.
Evolution and. Natural Selection Introduction to Biology. The Fog-Basking Beetle The Fog-Basking Beetle is a species that only lives in the deserts of southwestern Africa.
This beetle has an unusual behavior it stands on its head. o This allows the beetle to collect water from the fog that passes by on its body. o The water then runs down into its mouth. This is a behavioral. Selection pressure is an important force in shaping the evolution of vertebrate brain size among populations within species as well as between species.
The evolution of brain size is tightly linked to natural and sexual selection, and life-history by: 2. Western Australian populations of Mecyclothorax punctipennis (MacLeay) exhibit chiral polymorphism for male genitalic asymmetry.
The plesiomorphic genitalic enantiomorph, wherein the male aedeagal median lobe is left side superior when retracted in the abdomen, is rotated ° to a right side superior position in 23% of males from Western by: 5. Cryptic female choice (CFC) represents postmating intersexual selection arising from female-driven mechanisms at or after mating that bias sperm use and impact male paternity share.
Although biologists began to study CFC relatively late, largely spurred by Eberhard’s book published 20 years ago, the field has grown rapidly since then. Here, we review empirical Cited by: When selection favors divergent phenotypes in females and males, a substantial sexual conflict can arise if the trait providing optimal fitness for females decreases male fitness and vice versa, hence is subjected to sexually antagonistic selection [16,17,18].Usually, such sexual conflicts are solved by the sex-limited or -biased expression of the underlying loci, but sexual conflict may Cited by: 8.The evolution of sexual reproduction, because sexually reproducing organisms are likely to fare better in the continual evolutionary arms races that can arise between species (e.g., between parasites or pathogens and their hosts).
Darwin's book about his hypothesis as to how natural could favor trait such as bright colors, horns, behavioral.