Sexual Conflict

Russell Bonduriansky, University of New South Wales, Sydney, New South Wales, Australia

Published online: September 2016

DOI: 10.1002/9780470015902.a0003669.pub3

Abstract

Although females and males share a common interest in successful reproduction, the sexes often maximise their reproductive success (fitness) in mutually incompatible ways. Two types of sexual conflict are recognised: Interlocus sexual conflict reflects a conflict of interest over the outcome of an interaction between sexes (e.g. to mate or not?), with some genetic loci evolving to enhance male fitness at females' expense and other loci evolving to promote female fitness by mitigating male‐imposed harm. This conflict drives the evolution of sexually antagonistic male strategies such as coercive behaviours and morphologies, toxic ejaculates and infanticide and female counteradaptations that confer resistance to males. Intralocus sexual conflict reflects divergent selection on a shared trait whose expression is influenced by the same loci in both sexes, such that selection on one sex can displace the other sex from its phenotypic optimum. Both forms of sexual conflict drive the evolution of sexual dimorphism.

Key Concepts

  • Sexual conflict arises because strategies that maximise the fitness of one sex can reduce the fitness of the other sex.
  • Two basic forms of sexual conflict are recognised: interlocus (between genetic loci) and intralocus (within a genetic locus).
  • Interlocus sexual conflict is a conflict of interest over the outcome of some interaction (e.g. to mate or not?), mediated by different genetic loci in each sex.
  • Interlocus sexual conflict can lead to sexual ‘arms races’, whereby adaptations that benefit males at females' expense select for counteradaptations in females that mitigate male‐imposed harm.
  • Interlocus sexual conflict is manifested in a variety of traits that increase male reproductive success but harm females in the process, including behavioural harassment and coercion, morphological traits such as genital spines and chemical manipulation via ejaculate components or pheromones.
  • Intralocus sexual conflict is a conflict of interest over the expression of a shared trait that is subject to sex‐specific selection but influenced by the same genetic loci in both sexes.
  • Intralocus sexual conflict selects for modifications to the genetic basis of trait expression that allow each sex to evolve towards its phenotypic optimum, resulting in sexual dimorphism.
  • Intralocus sexual conflict challenges the ‘good genes’ model of sexual selection because females that mate with high‐quality males may produce low‐quality daughters.
  • Sexual conflict may increase the costs of sexual reproduction, reduce mean fitness in populations and (in theory) even promote population extinction.
  • The study of sexual conflict has become one of the most important and dynamic areas in evolutionary biology.

Keywords: sexual selection; sexually antagonistic coevolution; sexual arms race; interlocus sexual conflict; intralocus sexual conflict; signaller–receiver coevolution; reproduction; mate choice; mating system; Red Queen

Figure 1. A pair of Australian soldier beetles (family Cantharidae) engaged in copulation: the striking sexual dimorphism in body size reflects divergent reproductive strategies that generate sex‐specific selection on a host of morphological, behavioural, physiological and life‐history traits and engender sexual conflict. Copyright © 2010 R Bonduriansky.
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References

Andrade MCB (1996) Sexual selection for male sacrifice in the Australian Redback spider. Science 271: 70–72.

Arnqvist G and Nilsson T (2000) The evolution of polyandry: multiple mating and female fitness in insects. Animal Behaviour 60: 145–164.

Arnqvist G and Rowe L (2002) Antagonistic coevolution between the sexes in a group of insects. Nature 415: 787–789.

Arnqvist G and Rowe L (2005) Sexual Conflict. Princeton, NJ: Princeton University Press.

Bateman AJ (1948) Intra‐sexual selection in Drosophila. Heredity 2: 349–368.

Berger D, Berg EC, Widegren W, Arnqvist G and Maklakov AA (2014) Mutivariate intralocus sexual conflict in seed beetles. Evolution 68: 3457–3469.

Bonduriansky R and Chenoweth SF (2009) Intralocus sexual conflict. Trends in Ecology & Evolution 24: 280–288.

Bonduriansky R (2011) Sexual selection and conflict as engines of ecological diversification. The American Naturalist 178: 729–745.

Brommer JE, Kirkpatrick M, Qvarnstrom A, et al. (2007) The intersexual genetic correlation for lifetime fitness in the wild and its implications for sexual selection. PLoS One 2: e744.

Burke NW, Crean AJ and Bonduriansky R (2015) The role of sexual conflict in the evolution of facultative parthenogenesis: a study on the spiny leaf stick insect. Animal Behaviour 101: 117–127.

Chapman T, Liddle LF, Kalb JM, et al. (1995) Cost of mating in Drosophila melanogaster females is mediated by male accessory gland products. Nature 373: 241–244.

Chippindale AK, Gibson JR and Rice WR (2001) Negative genetic correlation for adult fitness between the sexes reveals ontogenetic conflict in Drosophila. Proceedings of the National Academy of Sciences of the United States of America 98: 1671–1675.

Connallon T and Clark AG (2010) Sex linkage, sex‐specific selection, and the role of recombination in the evolution of sexually dimorphic gene expression. Evolution 64: 3417–3442.

Connallon T, Cox RM and Calsbeek R (2010) Fitness consequences of sex‐specific selection. Evolution 64: 1671–1682.

Cox RM and Calsbeek R (2009) Sexually antagonistic selection, sexual dimorphism, and the resolution of intralocus sexual conflict. American Naturalist 173: 176–187.

Crudgington HS and Siva‐Jothy MT (2000) Genital damage, kicking and early death. Nature 407: 855–856.

Darwin CR (1871) The Descent of Man and Selection in Relation to Sex, 2nd edn. London, UK: John Murray.

Ebensperger LA (1998) Strategies and counterstrategies to infanticide in mammals. Biological Reviews 73: 321–346.

Eberhard WG and Cordero C (2003) Sexual conflict and female choice. Trends in Ecology & Evolution 18: 438–439.

Fisher RA (1930) The Genetical Theory of Natural Selection. Oxford, UK: Clarendon Press.

Foerster K, Coulson T, Sheldon BC, et al. (2007) Sexually antagonistic genetic variation for fitness in red deer. Nature 447: 1107–1109.

Fricke C, Bretman A and Chapman T (2009) Female nutritional status determines the magnitude and sign of responses to a male ejaculate signal in Drosophila melanogaster. Journal of Evolutionary Biology 23: 157–165.

Gavrilets S and Hayashi TI (2006) The dynamics of two‐ and three‐way sexual conflicts over mating. Philosophical Transactions of the Royal Society of London, Series B 361: 345–354.

Hardin G (1968) The tragedy of the commons. Science 162: 1243–1248.

Holland B and Rice WR (1998) Chase‐away sexual selection: antagonistic seduction versus resistance. Evolution 52: 1–7.

Hosken DJ, Stockley P, Tregenza T, et al. (2009) Monogamy and the battle of the sexes. Annual Review of Entomology 54: 361–378.

Hotzy C, Polak M, Rönn JL and Arnqvist G (2012) Phenotypic engineering unveils the function of genital morphology. Current Biology 22: 2258–2261.

Houston AI, Szekely T and McNamara JM (2005) Conflict between parents over care. Trends in Ecology & Evolution 20: 33–38.

Innocenti P and Morrow EH (2010) The sexually antagonistic genes of Drosophila melanogaster. PLoS Biology 8: e1000335.

Iwasa Y and Pomiankowski A (1995) Continual change in mate preferences. Nature 377: 420–422.

Kirkpatrick M (1996) Good genes and direct selection in the evolution of mating preferences. Evolution 50: 2125–2140.

Lande R (1980) Sexual dimorphism, sexual selection, and adaptation in polygenic characters. Evolution 34: 292–305.

Long TAF and Rice WR (2007) Adult locomotory activity mediates intralocus sexual conflict in a laboratory‐adapted population of Drosophila melanogaster. Proceedings of the Royal Society of London. Series B 274: 3105–3112.

Otto SP and Lenormand T (2002) Resolving the paradox of sex and recombination. Nature Reviews. Genetics 3: 252–261.

Parker GA, Barker RR and Smith VGF (1972) The origin and evolution of gamete dimorphism and the male–female phenomenon. Journal of Theoretical Biology 36: 529–553.

Parker GA (1979) Sexual selection and sexual conflict. In: Blum MS and Blum NA (eds) Sexual Selection and Reproductive Competition in Insects, pp. 123–166. New York: Academic Press.

Pennell TM, de Haas FJH, Morrow EH and van Doorn GS (2016) Contrasting effects of intralocus sexual conflict on sexually antagonistic coevolution. Proceedings of the National Academy of Sciences of the United States of America 113: E978–E986.

Perry JC, Sirot L and Wigby S (2013) The seminal symphony: how to compose an ejaculate. Trends in Ecology & Evolution 28: 414–422.

Pischedda A and Chippindale AK (2006) Intralocus sexual conflict diminishes the benefits of sexual selection. PLoS Biology 4: 2099–2103.

Poissant J, Wilson AJ and Coltman DW (2010) Sex‐specific genetic variance and the evolution of sexual dimorphism: a systematic review of cross‐sex genetic correlations. Evolution 64: 97–107.

Reinhardt K and Siva‐Jothy MT (2007) Biology of the bed bugs (Cimididae). Annual Review of Entomology 52: 351–374.

Rice WR (1984) Sex chromosomes and the evolution of sexual dimorphism. Evolution 38: 735–742.

Rönn J, Katvala M and Arnqvist G (2007) Coevolution between harmful male genitalia and female resistance in seed beetles. Proceedings of the National Academy of Sciences of the United States of America 104: 10921–10925.

Rowe L and Day T (2006) Detecting sexual conflict and sexually antagonistic coevolution. Philosophical Transactions of the Royal Society of London, Series B 361: 277–285.

Ryan MJ and Keddy‐Hector A (1992) Directional patterns of female mate choice and the role of sensory biases. The American Naturalist 139: S4–S35.

Stulp G, Kuijper B, Buunk AP, Pollet TV and Verhulst S (2012) Intralocus sexual conflict over human height. Biology Letters. DOI: 10.1098/rsbl.2012.0590.

Tatarnic NJ, Cassis G and Siva‐Jothy MT (2014) Traumatic insemination in terrestrial arthropods. Annual Review of Entomology 59: 245–261.

Trivers RL (1972) Parental investment and sexual selection. In: Campbell B (ed.) Sexual Selection and the Descent of Man, 1871–1971, pp. 136–179. Chicago: Aldine Publishing Co.

Wigby S and Chapman T (2005) Sex peptide causes mating costs in female Drosophila melanogaster. Current Biology 15: 316–321.

Wilder SM, Rypstra AL and Elgar MA (2009) The importance of ecological and phylogenetic conditions for the occurrence and frequency of sexual cannibalism. Annual Review of Ecology, Evolution, and Systematics 40: 21–39.

Further Reading

Arbuthnott D, Dutton EM, Agrawal AF and Rundle HD (2014) The ecology of sexual conflict: ecologically dependent parallel evolution of male harm and female resistance in Drosophila melanogaster. Ecology Letters 17: 221–228.

Arnqvist G, Edvardsson M, Friberg U and Nilsson T (2000) Sexual conflict promotes speciation in insects. Proceedings of the National Academy of Sciences of the United States of America 97: 10460–10464.

Bonduriansky R, Maklakov A, Zajitschek F and Brooks R (2008) Sexual selection, sexual conflict and the evolution of ageing and lifespan. Functional Ecology 22: 443–453.

Chapman T, Arnqvist G, Bangham J and Rowe L (2003) Sexual conflict. Trends in Ecology & Evolution 18: 41–47.

Chapman T (2006) Evolutionary conflicts of interest between males and females. Current Biology 16: R744–R754.

Parker GA (2006) Sexual conflict over mating and fertilisation: an overview. Philosophical Transactions of the Royal Society of London B: Biological Sciences 361: 235–259.

Rankin DJ, Dieckmann U and Kokko H (2011) Sexual conflict and the tragedy of the commons. The American Naturalist 177: 780–791.

Rice W and Gavrilets S (eds) (2014) The genetics and biology of sexual conflict. New York: Cold Spring Harbor Perspectives in Biology. Cold Spring Harbor.

Related Sub-Topics:

Physiological Ecology | Behavioural Ecology | Evolutionary Processes | Life History and Reproduction | Adaptive Evolution | Evolution: Theories and Ideas | Population Structure and Genetics | Evolutionary Ecology
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Article Title: Sexual Conflict
 
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Bonduriansky, Russell(Sep 2016) Sexual Conflict. In: eLS. John Wiley & Sons Ltd, Chichester. http://www.els.net [doi: 10.1002/9780470015902.a0003669.pub3]