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Sexual selection
Sexual selection
is a mode of natural selection where 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 population, either from being more attractive or preferring more attractive partners to produce offspring.[1][2] For instance in the breeding season sexual selection in frogs occurs with the males first gathering at the water's edge and making their mating calls: croaking. The females then arrive and choose the males with the deepest croaks and best territories. Generalizing, males benefit from frequent mating and monopolizing access to a group of fertile females. Females
Females
have a limited number of offspring they can have and they maximize the return on the energy they invest in reproduction. The concept was first articulated by Charles Darwin
Charles Darwin
and Alfred Russel Wallace who described it as driving species adaptations and that many organisms had evolved features whose function was deleterious to their individual survival,[3] and then developed by Ronald Fisher
Ronald Fisher
in the early 20th century. Sexual selection
Sexual selection
can typically lead males to extreme efforts to demonstrate their fitness to be chosen by females, producing sexual dimorphism in secondary sexual characteristics, such as the ornate plumage of birds such as birds of paradise and peafowl, or the antlers of deer, or the manes of lions, caused by a positive feedback mechanism known as a Fisherian runaway, where the passing-on of the desire for a trait in one sex is as important as having the trait in the other sex in producing the runaway effect. Although the sexy son hypothesis indicates that females would prefer male offspring, Fisher's principle
Fisher's principle
explains why the sex ratio is 1:1 almost without exception. Sexual selection
Sexual selection
is also found in plants and fungi. The maintenance of sexual reproduction in a highly competitive world is one of the major puzzles in biology given that asexual reproduction can reproduce much more quickly as 50% of offspring are not males, unable to produce offspring themselves. Many non-exclusive hypotheses have been proposed,[4] including the positive impact of an additional form of selection, sexual selection, on the probability of persistence of a species.[5]

Contents

1 History

1.1 Darwin 1.2 Ronald Fisher

2 Theory

2.1 Reproductive success 2.2 Modern interpretation 2.3 Toolkit of natural selection 2.4 Sexual dimorphism

3 In different taxa 4 References

4.1 Citations 4.2 Sources

5 External links

History[edit] Darwin[edit] Sexual selection
Sexual selection
was first proposed by Charles Darwin
Charles Darwin
in The Origin of Species
Species
(1859) and developed in The Descent of Man
Descent of Man
and Selection in Relation to Sex
Sex
(1871), as he felt that natural selection alone was unable to account for certain types of non-survival adaptations. He once wrote to a colleague that "The sight of a feather in a peacock's tail, whenever I gaze at it, makes me sick!" His work divided sexual selection into male-male competition and female choice.

... depends, not on a struggle for existence, but on a struggle between the males for possession of the females; the result is not death to the unsuccessful competitor, but few or no offspring.[6]

... when the males and females of any animal have the same general habits ... but differ in structure, colour, or ornament, such differences have been mainly caused by sexual selection.[7]

These views were to some extent opposed by Alfred Russel Wallace, mostly after Darwin's death. He accepted that sexual selection could occur, but argued that it was a relatively weak form of selection. He argued that male-male competitions were forms of natural selection, but that the "drab" peahen's coloration is itself adaptive as camouflage. In his opinion, ascribing mate choice to females was attributing the ability to judge standards of beauty to animals (such as beetles) far too cognitively undeveloped to be capable of aesthetic feeling.[8] Ronald Fisher[edit] Ronald Fisher, the English statistician and evolutionary biologist developed a number of ideas about sexual selection in his 1930 book The Genetical Theory of Natural Selection
The Genetical Theory of Natural Selection
including the sexy son hypothesis and Fisher's principle. The Fisherian runaway
Fisherian runaway
describes how sexual selection accelerates the preference for a specific ornament, causing the preferred trait and female preference for it to increase together in a positive feedback runaway cycle. In a remark that was not widely understood[9] for another 50 years he said:

... plumage development in the male, and sexual preference for such developments in the female, must thus advance together, and so long as the process is unchecked by severe counterselection, will advance with ever-increasing speed. In the total absence of such checks, it is easy to see that the speed of development will be proportional to the development already attained, which will therefore increase with time exponentially, or in geometric progression. —Ronald Fisher, 1930

Male
Male
long-tailed widowbird

This causes a dramatic increase in both the male's conspicuous feature and in female preference for it, resulting in marked sexual dimorphism, until practical physical constraints halt further exaggeration. A positive feedback loop is created, producing extravagant physical structures in the non-limiting sex. A classic example of female choice and potential runaway selection is the long-tailed widowbird. While males have long tails that are selected for by female choice, female tastes in tail length are still more extreme with females being attracted to tails longer than those that naturally occur.[10] Fisher understood that female preference for long tails may be passed on genetically, in conjunction with genes for the long tail itself. Long-tailed widowbird
Long-tailed widowbird
offspring of both sexes inherit both sets of genes, with females expressing their genetic preference for long tails, and males showing off the coveted long tail itself.[9] Richard Dawkins
Richard Dawkins
presents a non-mathematical explanation of the runaway sexual selection process in his book The Blind Watchmaker.[9] Females that prefer long tailed males tend to have mothers that chose long-tailed fathers. As a result, they carry both sets of genes in their bodies. That is, genes for long tails and for preferring long tails become linked. The taste for long tails and tail length itself may therefore become correlated, tending to increase together. The more tails lengthen, the more long tails are desired. Any slight initial imbalance between taste and tails may set off an explosion in tail lengths. Fisher wrote that:

The exponential element, which is the kernel of the thing, arises from the rate of change in hen taste being proportional to the absolute average degree of taste. —Ronald Fisher, 1932[11]

The peacock tail in flight, the classic example of a Fisherian runaway

The female widow bird chooses to mate with the most attractive long-tailed male so that her progeny, if male, will themselves be attractive to females of the next generation - thereby fathering many offspring that carry the female's genes. Since the rate of change in preference is proportional to the average taste amongst females, and as females desire to secure the services of the most sexually attractive males, an additive effect is created that, if unchecked, can yield exponential increases in a given taste and in the corresponding desired sexual attribute.

It is important to notice that the conditions of relative stability brought about by these or other means, will be far longer duration than the process in which the ornaments are evolved. In most existing species the runaway process must have been already checked, and we should expect that the more extraordinary developments of sexual plumage are not due like most characters to a long and even course of evolutionary progress, but to sudden spurts of change. —Ronald Fisher, 1930

Since Fisher's initial conceptual model of the 'runaway' process, Russell Lande[12] and Peter O'Donald[13] have provided detailed mathematical proofs that define the circumstances under which runaway sexual selection can take place. Theory[edit] Reproductive success[edit]

Extinct Irish elk
Irish elk
(Megaloceros giganteus). These antlers span 2.7 metres (8.9 ft) and have a mass of 40 kg (88 lb).

The reproductive success of an organism is measured by the number of offspring left behind, and their quality or probable fitness. Sexual preference creates a tendency towards assortative mating or homogamy. The general conditions of sexual discrimination appear to be (1) the acceptance of one mate precludes the effective acceptance of alternative mates, and (2) the rejection of an offer is followed by other offers, either certainly, or at such high chance that the risk of non-occurrence is smaller than the chance advantage to be gained by selecting a mate. The conditions determining which sex becomes the more limited resource in intersexual selection can be best understood by way of Bateman's principle, which states that the sex which invests the most in producing offspring becomes a limiting resource over which the other sex competes, illustrated by the greater nutritional investment of an egg in a zygote, and the limited capacity of females to reproduce; for example, in humans, a woman can only give birth every ten months, whereas, in theory, a male can become a father every day. Modern interpretation[edit]

Male
Male
mountain gorilla, a tournament species

The sciences of evolutionary psychology, human behavioural ecology, and sociobiology study the influence of sexual selection in humans. Darwin's ideas on sexual selection were met with scepticism by his contemporaries and not considered of great importance in the early 20th century, until in the 1930s biologists decided to include sexual selection as a mode of natural selection.[14] Only in the 21st century have they become more important in biology.[15] The theory however is generally applicable and analogous to natural selection.[16]

Flour beetle

Tungara frog

Research in 2015 indicates that sexual selection, including mate choice, "improves population health and protects against extinction, even in the face of genetic stress from high levels of inbreeding" and "ultimately dictates who gets to reproduce their genes into the next generation - so it's a widespread and very powerful evolutionary force." The study involved the flour beetle over a ten-year period where the only changes were in the intensity of sexual selection.[5] Another theory, the handicap principle of Amotz Zahavi, Russell Lande and W. D. Hamilton, holds that the fact that the male is able to survive until and through the age of reproduction with such a seemingly maladaptive trait is taken by the female to be a testament to his overall fitness. Such handicaps might prove he is either free of or resistant to disease, or that he possesses more speed or a greater physical strength that is used to combat the troubles brought on by the exaggerated trait. Zahavi's work spurred a re-examination of the field, which has produced an ever-accelerating number of theories. In 1984, Hamilton and Marlene Zuk
Marlene Zuk
introduced the "Bright Male" hypothesis, suggesting that male elaborations might serve as a marker of health, by exaggerating the effects of disease and deficiency. In 1990, Michael Ryan and A.S. Rand, working with the tungara frog, proposed the hypothesis of "Sensory Exploitation", where exaggerated male traits may provide a sensory stimulation that females find hard to resist. Subsequently, the theories of the "Gravity Hypothesis" by Jordi Moya-Larano et al. (2002), invoking a simple biomechanical model to account for the adaptive value for smaller male spiders of speed in clmbing vertical surfaces,[17] and "Chase Away" by Brett Holland and William R. Rice have been added. In the late 1970s, Janzen and Mary Willson, noting that male flowers are often larger than female flowers, expanded the field of sexual selection into plants.[18] In the past few years, the field has exploded to include other areas of study, not all of which fit Darwin's definition of sexual selection. These include cuckoldry, nuptial gifts, sperm competition, infanticide (especially in primates), physical beauty, mating by subterfuge, species isolation mechanisms, male parental care, ambiparental care, mate location, polygamy, and homosexual rape in certain male animals. Focusing on the effect of sexual conflict, as hypothesized by William Rice, Locke Rowe et Göran Arnvist, Thierry Lodé argues that divergence of interest constitutes a key for evolutionary process. Sexual conflict
Sexual conflict
leads to an antagonistic co-evolution in which one sex tends to control the other, resulting in a tug of war. Besides, the sexual propaganda theory only argued that mates were opportunistically lead, on the basis of various factors determining the choice such as phenotypic characteristics, apparent vigour of individuals, strength of mate signals, trophic resources, territoriality etc. and could explain the maintenance of genetic diversity within populations.[19] Several workers have brought attention to the fact that elaborated characters that ought to be costly in one way or another for their bearers (e.g., the tails of some species of Xiphophorus
Xiphophorus
fish) do not always appear to have a cost in terms of energetics, performance or even survival. One possible explanation for the apparent lack of costs is that "compensatory traits" have evolved in concert with the sexually selected traits.[20] Toolkit of natural selection[edit]

Protarchaeopteryx
Protarchaeopteryx
- skull based on Incisivosaurus
Incisivosaurus
and wings on Caudipteryx

Sexual selection
Sexual selection
may explain how certain characteristics (such as feathers) had distinct survival value at an early stage in their evolution. Geoffrey Miller proposes that sexual selection might have contributed by creating evolutionary modules such as Archaeopteryx feathers as sexual ornaments, at first. The earliest proto-birds such as China's Protarchaeopteryx, discovered in the early 1990s, had well-developed feathers but no sign of the top/bottom asymmetry that gives wings lift. Some have suggested that the feathers served as insulation, helping females incubate their eggs. But perhaps the feathers served as the kinds of sexual ornaments still common in most bird species, and especially in birds such as peacocks and birds-of-paradise today. If proto-bird courtship displays combined displays of forelimb feathers with energetic jumps, then the transition from display to aerodynamic functions could have been relatively smooth.[21] Sexual selection
Sexual selection
sometimes generates features that may help cause a species' extinction, as has been suggested[21] for the giant antlers of the Irish elk
Irish elk
(Megaloceros giganteus) that became extinct in Pleistocene
Pleistocene
Europe.[22] However, sexual selection can also do the opposite, driving species divergence - sometimes through elaborate changes in genitalia - such that new species emerge.[23][24][25] Sexual dimorphism[edit]

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Main article: Sexual dimorphism Sex
Sex
differences directly related to reproduction and serving no direct purpose in courtship are called primary sexual characteristics. Traits amenable to sexual selection, which give an organism an advantage over its rivals (such as in courtship) without being directly involved in reproduction, are called secondary sex characteristics.

The rhinoceros beetle is a classic case of sexual dimorphism. Plate from Darwin's Descent of Man, male at top, female at bottom

In most sexual species the males and females have different equilibrium strategies, due to a difference in relative investment in producing offspring. As formulated in Bateman's principle, females have a greater initial investment in producing offspring (pregnancy in mammals or the production of the egg in birds and reptiles), and this difference in initial investment creates differences in variance in expected reproductive success and bootstraps the sexual selection processes. Classic examples of reversed sex-role species include the pipefish, and Wilson's phalarope. Also, unlike a female, a male (except in monogamous species) has some uncertainty about whether or not he is the true parent of a child, and so is less interested in spending his energy helping to raise offspring that may or may not be related to him. As a result of these factors, males are typically more willing to mate than females, and so females are typically the ones doing the choosing (except in cases of forced copulations, which can occur in certain species of primates, ducks, and others). The effects of sexual selection are thus held to typically be more pronounced in males than in females. Differences in secondary sexual characteristics between males and females of a species are referred to as sexual dimorphisms. These can be as subtle as a size difference (sexual size dimorphism, often abbreviated as SSD) or as extreme as horns and colour patterns. Sexual dimorphisms abound in nature. Examples include the possession of antlers by only male deer, the brighter coloration of many male birds in comparison with females of the same species, or even more distinct differences in basic morphology, such as the drastically increased eye-span of the male stalk-eyed fly. The peacock, with its elaborate and colourful tail feathers, which the peahen lacks, is often referred to as perhaps the most extraordinary example of a dimorphism. Male
Male
and female black-throated blue warblers and Guianan cock-of-the-rocks also differ radically in their plumage. Early naturalists even believed the females to be a separate species. The largest sexual size dimorphism in vertebrates is the shell dwelling cichlid fish Neolamprologus callipterus in which males are up to 30 times the size of females. Many other fish such as guppies also exhibit sexual dimorphism. Extreme sexual size dimorphism, with females larger than males, is quite common in spiders and birds of prey. In different taxa[edit]

SEM image of lateral view of a love dart of the land snail Monachoides vicinus. The scale bar is 500 μm (0.5 mm).

Sexual selection in birds
Sexual selection in birds
- mammals - humans -scaled reptiles - amphibians - insects - spiders - major histocompatibility complex

Human spermatozoa can reach 250 million in a single ejaculation

Sexual selection
Sexual selection
has been observed to occur in plants, animals and fungi.[26] In certain hermaphroditic snail and slug species of molluscs the throwing of love darts is a form of sexual selection.[27] Certain male insects of the lepidoptera order of insects cement the vaginal pores of their females.[28]

A male bed bug (Cimex lectularius) traumatically inseminates a female bed bug (top). The female's ventral carapace is visibly cracked around the point of insemination.

Today, biologists say that certain evolutionary traits can be explained by intraspecific competition - competition between members of the same species - distinguishing between competition before or after sexual intercourse.

Illustration from The Descent of Man
Descent of Man
showing the tufted coquette Lophornis ornatus: female on left, ornamented male on right

Before copulation, intrasexual selection - usually between males - may take the form of male-to-male combat. Also, intersexual selection, or mate choice, occurs when females choose between male mates.[29] Traits selected by male combat are called secondary sexual characteristics (including horns, antlers, etc.), which Darwin described as "weapons", while traits selected by mate (usually female) choice are called "ornaments". Due to their sometimes greatly exaggerated nature, secondary sexual characteristics can prove to be a hindrance to an animal, thereby lowering its chances of survival. For example, the large antlers of a moose are bulky and heavy and slow the creature's flight from predators; they also can become entangled in low-hanging tree branches and shrubs, and undoubtedly have led to the demise of many individuals. Bright colourations and showy ornamenations, such as those seen in many male birds, in addition to capturing the eyes of females, also attract the attention of predators. Some of these traits also represent energetically costly investments for the animals that bear them. Because traits held to be due to sexual selection often conflict with the survival fitness of the individual, the question then arises as to why, in nature, in which survival of the fittest is considered the rule of thumb, such apparent liabilities are allowed to persist. However, one must also consider that intersexual selection can occur with an emphasis on resources that one sex possesses rather than morphological and physiological differences. For example, males of Euglossa imperialis, a non-social bee species, form aggregations of territories considered to be leks, to defend fragrant-rich primary territories. The purpose of these aggregations is only facultative, since the more suitable fragrant-rich sites there are, the more habitable territories there are to inhabit, giving females of this species a large selection of males with whom to potentially mate.[30] After copulation, male–male competition distinct from conventional aggression may take the form of sperm competition, as described by Parker[31] in 1970. More recently, interest has arisen in cryptic female choice,[32] a phenomenon of internally fertilised animals such as mammals and birds, where a female can get rid of a male's sperm without his knowledge.

Victorian cartoonists quickly picked up on Darwin's ideas about display in sexual selection. Here he is fascinated by the apparent steatopygia in the latest fashion.

Finally, sexual conflict is said to occur between breeding partners,[33] sometimes leading to an evolutionary arms race between males and females. Sexual selection
Sexual selection
can also occur as a product of pheromone release, such as with the stingless bee, Trigona corvina.[34] Female
Female
mating preferences are widely recognized as being responsible for the rapid and divergent evolution of male secondary sexual traits.[35] Females
Females
of many animal species prefer to mate with males with external ornaments - exaggerated features of morphology such as elaborate sex organs. These preferences may arise when an arbitrary female preference for some aspect of male morphology — initially, perhaps, a result of genetic drift — creates, in due course, selection for males with the appropriate ornament. One interpretation of this is known as the sexy son hypothesis. Alternatively, genes that enable males to develop impressive ornaments or fighting ability may simply show off greater disease resistance or a more efficient metabolism, features that also benefit females. This idea is known as the good genes hypothesis. Bright colors that develop in animals during mating season function to attract partners. It has been suggested that there is a causal link between strength of display of ornaments involved in sexual selection and free radical biology.[36] To test this idea, experiments were performed on male painted dragon lizards.[37] Male
Male
lizards are brightly conspicuous in their breeding coloration, but their color declines with aging. Experiments involving administration of antioxidants to these males led to the conclusion that breeding coloration is a reflection of innate anti-oxidation capacity that protects against oxidative damage, including oxidative DNA damage.[37] Thus color could act as a “health certificate” that allows females to visualize the underlying oxidative stress induced damage in potential mates. Darwin conjectured that heritable traits such as beards and hairlessness in different human populations are results of sexual selection in humans. Geoffrey Miller has hypothesized that many human behaviours not clearly tied to survival benefits, such as humour, music, visual art, verbal creativity, and some forms of altruism, are courtship adaptations that have been favoured through sexual selection. In that view, many human artefacts could be considered subject to sexual selection as part of the extended phenotype, for instance clothing that enhances sexually selected traits. Some argue that the evolution of human intelligence is a sexually selected trait, as it would not confer enough fitness in itself relative to its high maintenance costs.[38] References[edit] Citations[edit]

^ Cecie Starr (2013). Biology: The Unity & Diversity of Life (Ralph Taggart, Christine Evers, Lisa Starr ed.). Cengage Learning. p. 281.  ^ Vogt, Yngve (January 29, 2014). "Large testicles are linked to infidelity". Phys.org. Archived from the original on January 31, 2014. Retrieved January 31, 2014.  ^ Darwin, Charles; A. R. Wallace (1858). "On the Tendency of Species to form Varieties; and on the Perpetuation of Varieties and Species
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benefits of sexual selection explain the existence of males phys.org May 18, 2015 Report on a study by the University of East Anglia Archived August 21, 2015, at the Wayback Machine. ^ Darwin, Charles (1859). On the Origin of Species
Species
(1st edition). Chapter 4, page 88. "And this leads me to say a few words on what I call Sexual Selection. This depends ..." "Archived copy". Archived from the original on 2011-11-05. Retrieved 2011-05-22.  ^ Darwin, Charles (1859). On the Origin of Species
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(1st edition). Chapter 4, page 89. "Archived copy". Archived from the original on 2011-11-05. Retrieved 2011-05-22.  ^ Wallace, Alfred Russel (1892). "Note on Sexual Selection (S459: 1892)". Smith, Charles. Archived from the original on 17 February 2017. Retrieved 13 January 2017.  ^ a b c Dawkins, Richard (1986). The Blind Watchmaker. Longman, London. Published in Penguin Books 1988, 1991, and 2006. Chapter 8, Explosions and Spirals. ^ Andersson, M, Sexual Selection, Princeton University Press, Princeton, 1994. ^ Ronald Fisher
Ronald Fisher
in a letter to Charles Galton Darwin, 22 November 1932, cited in Fisher, R. A., Bennett, J. H. 1999. The genetical theory of natural selection: A complete variorum edition, Oxford University Press, Oxford, p. 308 ^ Lande, R. (1981). "Models of speciation by sexual selection on polygenic traits". PNAS. 78 (6): 3721–3725. doi:10.1073/pnas.78.6.3721. PMC 319643 . PMID 16593036.  "Archived copy". Archived from the original on 2013-06-12. Retrieved 2011-06-11.  ^ O'Donald, Peter (1980). Genetic Models of Sexual Selection. Cambridge University Press, New York, NY. 250 pp. ^ Miller, Geoffey, The Mating
Mating
Mind, p.24 ^ Sexual Selection and the Mind Archived 2015-06-10 at the Wayback Machine. ^ Hosken, David J.; House, Clarissa M. (January 2011). "Sexual Selection". Current Biology. 21: R62–R65. doi:10.1016/j.cub.2010.11.053.  ^ Moya-Laraño, J. (2007). "Gravity still matters". Functional Ecology. 21: 1178–1181. doi:10.1111/j.1365-2435.2007.01335.x.  ^ Wilson, Mary F (June 1979). "Sexual Selection In Plants". The American Naturalist. 113, No. 6: 777–790.  ^ Thierry Lodé (2006). "La guerre des sexes chez les animaux " Eds Odile Jacob, Paris. ISBN 2-7381-1901-8 ^ Sexual Selection Costs & Compensations Archived 2014-06-06 at the Wayback Machine. ^ a b Miller, Geoffrey (2000). The Mating
Mating
Mind. Anchor Books, a division of Random House, Inc. (First Anchor Books Edition, April 2001). New York, NY. Anchor ISBN 0-385-49517-X ^ Gould, Stephen J. (1974). "Origin and Function of 'Bizarre' Structures - Antler Size and Skull Size in 'Irish Elk', Megaloceros giganteus". Evolution. 28 (2): 191–220. doi:10.2307/2407322.  ^ Hosken, David J., and Paula Stockley. " Sexual selection
Sexual selection
and genital evolution Archived 2017-10-12 at the Wayback Machine.." Trends in Ecology & Evolution
Evolution
19.2 (2004): 87-93. ^ Arnqvist, Göran. "Comparative evidence for the evolution of genitalia by sexual selection Archived 2012-01-27 at the Wayback Machine.." Nature 393.6687 (1998): 784. ^ Eberhard, W. G. (1985). Sexual Selection and Animal Genitalia. Harvard University Press, Cambridge, Mass. ^ Nieuwenhuis, B. P. S. (2012). " Sexual selection
Sexual selection
in fungi". Journal of Evolutionary Biology. 25: 2397–2411. doi:10.1111/jeb.12017.  ^ Tales of two snails: sexual selection and sexual conflict in Lymnaea stagnalis and Helix aspersa Oxford Journals Archived 2015-09-04 at the Wayback Machine. ^ von Byern, Janek; Grunwald, Ingo. Biological Adhesive Systems: From Nature to Technical and Medical Application. Springer Science & Business Media, 2011. p. 124. ISBN 9783709102862. Archived from the original on 2017-10-11.  ^ Campbell, N. A.; J. B. Reece (2005). Biology. Benjamin Cummings. p. 1230. ISBN 0-8053-7146-X.  ^ Kimsey, Lynn Siri (1980). "The behaviour of male orchid bees (Apidae, Hymenoptera, Insecta) and the question of leks". Animal Behaviour. 28 (4): 996–1004. doi:10.1016/s0003-3472(80)80088-1.  ^ Parker, Geoffrey A. (1970). " Sperm competition
Sperm competition
and its evolutionary consequences in the insects". Biological Reviews. 45: 525–567. doi:10.1111/j.1469-185x.1970.tb01176.x.  ^ Eberhard, WG. (1996) Female
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control: Sexual selection
Sexual selection
by cryptic female choice. Princeton, Princeton University Press. ^ Locke Rowe, Göran Arnvist. (2013) Sexual conflict, Princeton Univ Press.[page needed] ^ Jarau, Stefan; Dambacher, Jochen; Twele, Robert; Aguilar, Ingrid; Francke, Wittko; Ayasse, Manfred (2010). "The Trail Pheromone
Pheromone
of a Stingless Bee, Trigona corvina
Trigona corvina
(Hymenoptera, Apidae, Meliponini), Varies between Populations". Chemical Senses. 35 (7): 593–601. doi:10.1093/chemse/bjq057. ISSN 0379-864X. PMID 20534775. Archived from the original on 2016-01-01.  ^ Andersson M (1994). Sexual Selection. Princeton Univ Press, Princeton, NJ.[page needed] ^ von Schantz T, Bensch S, Grahn M, Hasselquist D, Wittzell H (January 1999). "Good genes, oxidative stress and condition-dependent sexual signals". Proc. Biol. Sci. 266 (1414): 1–12. doi:10.1098/rspb.1999.0597. PMC 1689644 . PMID 10081154.  ^ a b Olsson M, Tobler M, Healey M, Perrin C, Wilson M (August 2012). "A significant component of ageing (DNA damage) is reflected in fading breeding colors: an experimental test using innate antioxidant mimetics in painted dragon lizards". Evolution. 66 (8): 2475–83. doi:10.1111/j.1558-5646.2012.01617.x. PMID 22834746.  ^ PLoS ONE: Sexual Selection and the Evolution
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Sources[edit]

Andersson, M. (1994) Sexual selection. Princeton University Press. ISBN 0-691-00057-3 Arnqvist, G. & Rowe, L. (2013) Sexual conflict. Princeton University Press Lande, C. F. R. (1981). "Models of speciation by sexual selection on polygenic traits" (PDF). Proc. Natl. Acad. Sci. U.S.A. 78 (6): 3721–5. doi:10.1073/pnas.78.6.3721. PMC 319643 . PMID 16593036. Archived from the original (PDF) on 2007-09-27.  Cronin, H. (1991) The ant and the peacock: altruism and sexual selection from Darwin to today. Cambridge University Press. Darwin, C. (1871) The Descent of Man
Descent of Man
and Selection in Relation to Sex. John Murray, London. Eberhard, W. G. (1996) Female
Female
control: Sexual selection
Sexual selection
by cryptic female choice. Princeton, Princeton University Press. Fisher, R. A. (1930) The Genetical Theory of Natural Selection. Oxford University Press, ISBN 0-19-850440-3, Chapter 6 Memeoid.net Lodé, T. (2006) La guerre des sexes chez les animaux. Eds Odile Jacob. ISBN 2-7381-1901-8 Miller, G. F. (1998) How mate choice shaped human nature: A review of sexual selection and human evolution. In: C. Crawford & D. Krebs (Eds.) Handbook of evolutionary psychology: Ideas, issues, and applications. Lawrence Erlbaum, pp. 87–129 Miller, G. F. (2000) The Mating
Mating
Mind: How sexual choice shaped the evolution of human nature. Heinemann, London. ISBN 0-434-00741-2 Rosenberg, J. & Tunney, R. J. (2008). Human vocabulary use as display. Evolutionary Psychology, 6, 538-549

External links[edit]

Wikimedia Commons has media related to Sexual selection.

Natural & Sexual Selection Videos by the Cornell Lab of Ornithology Sexual Selection: Stanford University The Great Debate: Sexual Selection Intralocus Sexual Conflict Diminishes the Benefits of Sexual Selection A New Interpretation of Natural Beauty
Beauty
and Sexual Selection Review of GF Miller's The Mating
Mating
Mind Why Sex
Sex
Evolved "The sexual propaganda theory" "Sexual Selection Theory and Human Reproductive Behaviour "

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Basic concepts

Species
Species
( Species
Species
problem · Species
Species
complex) Reproductive isolation Anagenesis Cladogenesis Cospeciation Parallel speciation Evidence of common descent

Geographic modes

Allopatric (Peripatric · Quantum · Centrifugal · Founder effect) Parapatric (Clines · Ring species) Sympatric

Isolating factors

Adaptation Natural selection Sexual selection Ecological speciation Assortative mating Haldane's rule

Hybridization

Hybrid speciation
Hybrid speciation
( Polyploidy
Polyploidy
· Recombination) Reinforcement (evidence) Character displacement

Speciation
Speciation
in taxa

Birds Fish Insects Plants Fossils ( Paleopolyploidy
Paleopolyploidy
· Punctuated equilibrium
Punctuated equilibrium
· Macroevolution · Chronospecies)

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Sex

Biological terms

Sexual dimorphism

Male Female

Sexual differentiation

Feminization Virilization

Sex-determination system

XY ZW XO Temperature-dependent Haplodiploidy

Heterogametic sex Homogametic sex Sex
Sex
chromosome

X chromosome Y chromosome

Testis-determining factor Hermaphrodite

Sequential hermaphroditism

Intersex parasexuality

Sexual reproduction

Evolution
Evolution
of sexual reproduction

Anisogamy Isogamy

Germ cell Reproductive system Sex
Sex
organ Meiosis Gametogenesis

Spermatogenesis Oogenesis

Gamete

spermatozoon ovum

Fertilization

External Internal

Sexual selection Plant
Plant
reproduction Fungal reproduction Sexual reproduction
Sexual reproduction
in animals

Sexual intercourse Copulation Human reproduction

Sexuality

Plant
Plant
sexuality Animal sexuality Human sexuality

Mechanics Differentiation Activity

Sex
Sex
portal Biology
Biology
portal

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Evolutionary biology

Evolutionary history of life Index of evolutionary biology articles Introduction Outline of evolution Timeline of evolution

Evolution

Abiogenesis Adaptation Adaptive radiation Cladistics Coevolution Common descent Convergence Divergence Earliest known life forms Evidence of common descent Extinction

Event

Gene-centered view Homology Last universal common ancestor Macroevolution Microevolution Origin of life Panspermia Parallel evolution Prehistoric Autopsy Speciation Taxonomy

Population
Population
genetics

Biodiversity Gene flow Genetic drift Mutation Natural selection Variation

Development

Canalisation Evolutionary developmental biology Inversion Modularity Phenotypic plasticity

Of taxa

Birds

origin

Brachiopods Molluscs

Cephalopods

Dinosaurs Fish Fungi Insects

butterflies

Life Mammals

cats canids

wolves dogs

hyenas dolphins and whales horses primates

humans lemurs

sea cows

Plants Reptiles Spiders Tetrapods Viruses

influenza

Of organs

Cell DNA Flagella Eukaryotes

symbiogenesis chromosome endomembrane system mitochondria nucleus plastids

In animals

eye hair auditory ossicle nervous system brain

Of processes

Aging

Death Programmed cell death

Avian flight Biological complexity Cooperation Color vision

in primates

Emotion Empathy Ethics Eusociality Immune system Metabolism Monogamy Morality Mosaic evolution Multicellularity Sexual reproduction

Gamete
Gamete
differentiation/sexes Life cycles/nuclear phases Mating
Mating
types Meiosis Sex-determination

Snake venom

Tempo and modes

Gradualism/Punctuated equilibrium/Saltationism Micromutation/Macromutation Uniformitarianism/Catastrophism

Speciation

Allopatric Anagenesis Catagenesis Cladogenesis Cospeciation Ecological Hybrid Parapatric Peripatric Reinforcement Sympatric

History

Renaissance and Enlightenment Transmutation of species Charles Darwin

On the Origin of Species

History of paleontology Transitional fossil Blending inheritance Mendelian inheritance The eclipse of Darwinism Modern synthesis History of molecular evolution Extended evolutionary synthesis

Philosophy

Darwinism Alternatives

Catastrophism Lamarckism Orthogenesis Mutationism Saltationism Structuralism

Spandrel

Theistic Vitalism

Teleology in biology

Related

Biogeography Ecological genetics Molecular evolution Phylogenetics

Tree

Polymorphism Protocell Systematics

Category Commons Portal WikiProject

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Patterns in nature

Patterns

Crack Dune Foam Meander Phyllotaxis Soap bubble Symmetry

in crystals Quasicrystals in flowers in biology

Tessellation Vortex street Wave Widmanstätten pattern

Causes

Pattern formation Biology

Natural selection Camouflage Mimicry Sexual selection

Mathematics

Chaos theory Fractal Logarithmic spiral

Physics

Crystal Fluid dynamics Plateau's laws Self-organization

People

Plato Pythagoras Empedocles Fibonacci

Liber Abaci

Adolf Zeising Ernst Haeckel Joseph Plateau Wilson Bentley D'Arcy Wentworth Thompson

On Growth and Form

Alan Turing

The Chemical Basis of Morphogenesis

Aristid Lindenmayer Benoît Mandelbrot

How Long Is the Coast of Britain? Statistical Self-Similarity and Fractional Dimension

Related

Pattern recognition Emergence Mathematics
Mathematics
and art

Evolutionary bi