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PLOS ONE  2007 

Selection at the Y Chromosome of the African Buffalo Driven by Rainfall

DOI: 10.1371/journal.pone.0001086

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Abstract:

Selection coefficients at the mammalian Y chromosome typically do not deviate strongly from neutrality. Here we show that strong balancing selection, maintaining intermediate frequencies of DNA sequence variants, acts on the Y chromosome in two populations of African buffalo (Syncerus caffer). Significant correlations exist between sequence variant frequencies and annual rainfall in the years before conception, with five- to eightfold frequency changes over short time periods. Annual rainfall variation drives the balancing of sequence variant frequencies, probably by affecting parental condition. We conclude that sequence variants confer improved male reproductive success after either dry or wet years, making the population composition and dynamics very sensitive to climate change. The mammalian Y chromosome, interacting with ecological processes, may affect male reproductive success much more strongly than previously thought.

References

[1]  Roldan ERS, Gomendio M (1999) The Y chromosome as a battle ground for sexual selection. Trends Ecol Evol 14: 58–62.
[2]  Cummins J (2001) Mitochondrial DNA and the Y chromosome: parallels and paradoxes. Reprod Fertil Dev 13: 533–542.
[3]  Jobling MA, Tyler-Smith C (2003) The human Y chromosome: an evolutionary marker comes of age. Nat Rev Genet 4: 598–612.
[4]  Quintana-Murci L, Krausz C, McElreavey K (2001) The human Y chromosome: function, evolution and disease. Forensic Sci Int 118: 169–181.
[5]  Liu WS, Mariani P, Beattie CW, Alexander LJ, de Leon FAP (2002) A radiation hybrid map for the bovine Y Chromosome. Mamm Genome 13: 320–326.
[6]  Liu WS, Beattie CW, de Leon FAP (2003) Bovine Y chromosome microsatellite polymorphisms. Cytogenet Genome Res 102: 53–58.
[7]  Prins HHT (1996) Ecology and behaviour of the African buffalo: social inequality and decision making;. In: Putman RJ, editor. London: Chapman and Hall.
[8]  Jolles AE, Cooper DV, Levin SA (2005) Hidden effects of chronic tuberculosis in African buffalo. Ecology 86: 2358–2364.
[9]  Whyte I (2005) Kruger NP buffalo census. Gnusletter 24: 14–16.
[10]  Cross PC, Lloyd-Smith JO, Getz WM (2005) Disentangling association patterns in fission-fusion societies using African buffalo as an example. Anim Behav 69: 499–506.
[11]  Jolles AE (2004) Disease ecology of tuberculosis in African buffalo [PhD thesis]. Princeton: Princeton University.
[12]  Chippindale AK, Rice WR (2001) Y chromosome polymorphism is a strong determinant of male fitness in Drosophila melanogaster. Proc Natl Acad Sci U S A 98: 5677–5682.
[13]  Skaletsky H, Kuroda-Kawaguchi T, Minx PJ, Cordum HS, Hillier L, et al. (2003) The male-specific region of the human Y chromosome is a mosaic of discrete sequence classes. Nature 423: 825–U822.
[14]  Simmons LW, Emlen DJ (2006) Evolutionary trade-off between weapons and testes. Proc Natl Acad Sci U S A 103: 16346–16351.
[15]  Snook RR (2005) Sperm in competition: not playing by the numbers. Trends Ecol Evol 20: 46–53.
[16]  Bourgarel M, Fritz H, Gaillard JM, De Garine-Wichatitsky M, Maudet F (2002) Effects of annual rainfall and habitat types on the body mass of impala (Aepyceros melampus) in the Zambezi Valley, Zimbabwe. Afr J Ecol 40: 186–193.
[17]  Mills MGL, Biggs HC, Whyte IJ (1995) The relationship between rainfall, lion predation and population trends in African herbivores. Wildl Res 22: 75–87.
[18]  Owen-Smith N, Mason DR, Ogutu JO (2005) Correlates of survival rates for 10 African ungulate populations: density, rainfall and predation. J Anim Ecol 74: 774–788.
[19]  Georgiadis NJ, Olwero JGN, Ojwang G, Romanach SS (2007) Savanna herbivore dynamics in a livestock-dominated landscape: I. Dependence on land use, rainfall, density, and time. Biol Conserv 137: 461–472.
[20]  Govender N, Trollope WSW, Van Wilgen BW (2006) The effect of fire season, fire frequency, rainfall and management on fire intensity in savanna vegetation in South Africa. J Appl Ecol 43: 748–758.
[21]  Ogutu JO, Owen-Smith N (2005) Oscillations in large mammal populations: are they related to predation or rainfall? Afr J Ecol 43: 332–339.
[22]  Hellborg L, Ellegren H (2004) Low levels of nucleotide diversity in mammalian Y chromosomes. Mol Biol Evol 21: 158–163.
[23]  Carson HL (2003) Mate choice theory and the mode of selection in sexual populations. Proc Natl Acad Sci U S A 100: 6584–6587.
[24]  James WH (1998) Hypotheses on mammalian sex ratio variation at birth. J Theor Biol 192: 113–116.
[25]  Charbonnel N, Pemberton J (2005) A long-term genetic survey of an ungulate population reveals balancing selection acting on MHC through spatial and temporal fluctuations in selection. Heredity 95: 377–388.
[26]  Birkhead TR, Pizzari T (2002) Postcopulatory sexual selection. Nat Rev Genet 3: 262–273.
[27]  Birkhead TR, Martinez JG, Burke T, Froman DP (1999) Sperm mobility determines the outcome of sperm competition in the domestic fowl. Proc R Soc Lond Ser B-Biol Sci 266: 1759–1764.
[28]  El-Wishy AB (2007) The postpartum buffalo II. Acyclicity and anestrus. Anim Reprod Sci 97: 216–236.
[29]  Hoerling M, Hurrell J, Eischeid J, Phillips A (2006) Detection and attribution of twentieth-century northern and southern African rainfall change. J Clim 19: 3989–4008.
[30]  Visscher DR, van Aarde RJ, Whyte I (2004) Environmental and maternal correlates of foetal sex ratios in the African buffalo (Syncerus caffer) and savanna elephant (Loxodonta africana). J Zool 264: 111–116.
[31]  Rodwell TC, Whyte IJ, Boyce WM (2001) Evaluation of population effects of bovine tuberculosis in free-ranging African buffalo (Syncerus caffer). J Mammal 82: 231–238.
[32]  Caron A, Cross PC, Du Toit JT (2003) Ecological implications of bovine tuberculosis in African buffalo herds. Ecol Appl 13: 1338–1345.

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