Abstract
Intense competition between males for reproduction has led to the evolution of alternative mating tactics (AMTs). Feral goat males usually use a tactic called tending, in which they defend oestrous females from other males. Males may also use a second mating tactic called coursing, in which they gain access to oestrous females by disturbing a tending pair. Herein, we examine estimated mating success (EMS) and risks of using these tactics. Tending was only used by mature (≥4 years old), higher-ranking males and accounted for 75% of EMS. Coursing was used by males of all ages and dominance ranks, and accounted for 25% of EMS. Using coursing, male kids achieved 8% of EMS. Mature males achieved 92% of EMS. Both age and dominance rank were related to EMS, but age was not important after its relationship with dominance was controlled. Tending bouts were, on average, ca. 30 min long, while coursing bouts only averaged ca. 2 min. Males were more likely to suffer a butt while coursing than while tending, and formerly tending males were responsible for most butts. Kids that coursed had the highest risk of being butted. In most AMTs, there are reductions in the risks in relation to low fitness benefits. However, we found that the risks of butts during coursing were high, while our evidence suggests that the EMS was probably low. Nevertheless, the existence of an effective AMT in male feral goats may have an important influence on the intensity of sexual selection and the effective population size.
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References
Ahmad N, Noakes DE (1996) Sexual maturity in British breeds of goat kids. Br Vet J 152:93–103
Alvarez F (1993) Risks of fighting in relation to age and territory holding in fallow deer. Can J Zool 71:376–383
Andersson M (1994) Sexual selection. Princeton University Press, Princeton
Austad SN, Howard RH (1984) Introduction to the symposium: alternative reproductive tactics. Am Zool 24:307–308
Bro-Jørgensen J (2002) Overt female mate competition and preference for central males in a lekking antelope. Proc Natl Acad Sci U S A 99:9290–9293
Bro-Jørgensen J, Durant SM (2003) Mating strategies of topi bulls: getting in the centre of attention. Anim Behav 65:585–594
Bullock DJ (1991) Feral goat (Capra hircus). In: Corbet GB, Harris S (eds) The handbook of British mammals. Blackwell, Oxford, pp 541–547
Bullock DJ, Pickering SP (1984) The validity of horn ring counts to determine the age of Scottish feral goats. J Zool (1965) 202:561–564
Clutton-Brock TH, Albon SD, Gibson RM, Guinness FE (1979) The logical stag: adaptive aspects of fighting in red deer (Cervus elaphus L.). Anim Behav 27:211–225
Coltman DW, Bancroft DR, Robertson A, Smith JA, Clutton-Brock TH, Pemberton JM (1999). Male reproductive success in a promiscuous mammal: behavioural estimates compared with genetic paternity. Mol Ecol 8:1199–1209
Coltman DW, Festa-Bianchet M, Jorgenson JT, Strobeck C (2002) Age-dependent sexual selection in bighorn rams. Proc R Soc Lond B Biol Sci 269:165–172
Dominey WJ (1984) Alternative mating tactics and evolutionary stable strategies. Am Zool 24:385–396
Dunbar RIM, Buckland D, Miller D (1990) Mating strategies of male feral goats: a problem in optimal foraging. Anim Behav 40:653–667
Emlen S, Oring L (1977) Ecology, sexual selection and the evolution of mating systems. Science 197:215–223
Festa-Bianchet M (1987) Bighorn sheep, climbing accidents and implications for mating strategy. Mammalia 51:618–620
Forsyth DM, Duncan RP, Tustin KG, Gaillard J-M (2005) A substantial energetic cost to male reproduction in a sexually dimorphic ungulate. Ecology 86:2154–2163
Geist V (1971) Mountain sheep. A study in behaviour and evolution. University of Chicago Press, Chicago
Gross MR (1996) Alternative reproductive strategies and tactics: diversity within sexes. Trends Ecol Evol 11:92–98
Hogg JT (1984) Mating in bighorn sheep: multiple creative male strategies. Science 225:526–529
Hogg JT, Forbes SH (1997) Mating in bighorn sheep: frequent male reproduction via a high risk “unconventional” tactic. Behav Ecol Sociobiol 41:33–48
Isaac JL (2005) Mass loss during the mating season in male common brushtail possums (Trichosurus vulpecula): implications for age-specific variation in mating strategy. J Zool (1987) 266:181–185
Komers PE, Birgersson B, Ekvall K (1999) Timing of estrus in fallow deer is adjusted to the age of available mates. Am Nat 153:431–436
Lucas JR, Howard RD (1995) On alternative reproductive tactics in anurans: dynamic games with density and frequency dependence. Am Nat 146:365–397
Maynard Smith J (1982) Evolution and the theory of games. Cambridge University Press, Cambridge
McElligott AG, Hayden TJ (2000) Lifetime mating success, sexual selection and life history of fallow bucks (Dama dama). Behav Ecol Sociobiol 48:203–210
McElligott AG, Mattiangeli V, Mattiello S, Verga M, Reynolds CA, Hayden TJ (1998) Fighting tactics of fallow bucks (Dama dama, Cervidae): reducing the risks of serious conflict. Ethology 104:789–803
McElligott AG, Gammell MP, Harty HC, Paini DR, Murphy DT, Walsh JT, Hayden TJ (2001) Sexual size dimorphism in fallow deer: do larger, heavier males gain greater mating success? Behav Ecol Sociobiol 49:266–272
McElligott AG, Naulty F, Clarke WV, Hayden TJ (2003) The somatic cost of reproduction: what determines reproductive effort in prime-aged fallow bucks? Evol Ecol Res 5:1239–1250
Nunney L (1993) The influence of mating system and overlapping generations on effective population size. Evolution 47:1329–1341
Pelletier F (2005) Foraging time of rutting bighorn rams varies with individual behaviour, not mating tactic. Behav Ecol 16:280–285
Pemberton JM, Coltman DW, Smith JA, Pilkington JG (1999) Molecular analysis of a promiscuous, fluctuating mating system. Biol J Linn Soc 68:289–301
Preston BT, Stevenson IR, Pemberton JM, Wilson K (2001) Dominant rams lose out by sperm depletion. Nature 409:681–682
Preston BT, Stevenson IR, Pemberton JM, Coltman DW, Wilson K (2003a) Overt and covert competition in a promiscuous mammal: the importance of weaponry and testes size to male reproductive success. Proc R Soc Lond B Biol Sci 270:633–640
Preston BT, Stevenson IR, Wilson K (2003b) Soay rams target reproductive activity towards promiscuous females' optimal insemination period. Proc R Soc Lond B Biol Sci 270:2073–2078
Rubenstein DI (1984) Resource acquisition and alternative mating strategies in water striders. Am Zool 24:345–353
Saunders FC (2000) Mating system, seasonal breeding and survival of feral goats (Capra hircus) in the Wicklow Mountains, Ireland. Ph.D. thesis, National University of Ireland, Dublin
Shackleton DM, Shank CC (1984) A review of the social behaviour of feral and wild sheep and goats. J Anim Sci 58:500–509
Stevenson IR, Bancroft DR (1995) Fluctuating trade-offs favour precocial maturity in male Soay sheep. Proc R Soc Lond B Biol Sci 262:267–275
Stockley P, Searle JB, Macdonald DW, Jones CS (1996) Correlates of reproductive success within alternative mating tactics of the common shrew. Behav Ecol 7:334–340
Widemo F (1998) Alternative reproductive strategies in the ruff, Philomachus pugnax: a mixed ESS? Anim Behav 56:329–336
Yoccoz NG, Mysterud A, Langvatn R, Stenseth NC (2002) Age- and density dependent reproductive effort in male red deer. Proc R Soc Lond B Biol Sci 269:1523–1528
Acknowledgements
We acknowledge Dúchas for permission to work in the Wicklow Mountains National Park and thank the Rangers and staff of the park for their valuable help. We thank the members of the Mammal Research Group and Department of Zoology, National University of Ireland, Dublin, and other volunteers who helped in the catching and tagging of the goats, and Noínín Reynolds for field assistance during the 1996 breeding season. We thank Marco Festa-Bianchet and two anonymous referees for their comments on the manuscript. We acknowledge the financial support of Dúchas, The Department of Education and Enterprise Ireland.
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Saunders, F.C., McElligott, A.G., Safi, K. et al. Mating tactics of male feral goats (Capra hircus): risks and benefits. acta ethol 8, 103–110 (2005). https://doi.org/10.1007/s10211-005-0006-y
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DOI: https://doi.org/10.1007/s10211-005-0006-y