title: Effects of the distribution of female primates on the number of males.
abstract: The spatiotemporal distribution of females is thought to drive variation in mating systems, and hence plays a central role in understanding animal behavior, ecology and evolution. Previous research has focused on investigating the links between female spatiotemporal distribution and the number of males in haplorhine primates. However, important questions remain concerning the importance of spatial cohesion, the generality of the pattern across haplorhine and strepsirrhine primates, and the consistency of previous findings given phylogenetic uncertainty. To address these issues, we examined how the spatiotemporal distribution of females influences the number of males in primate groups using an expanded comparative dataset and recent advances in bayesian phylogenetic and statistical methods. Specifically, we investigated the effect of female distributional factors (female number, spatial cohesion, estrous synchrony, breeding season duration and breeding seasonality) on the number of males in primate groups. Using bayesian approaches to control for uncertainty in phylogeny and the model of trait evolution, we found that the number of females exerted a strong influence on the number of males in primate groups. In a multiple regression model that controlled for female number, we found support for temporal effects, particularly involving female estrous synchrony: the number of males increases when females are more synchronously receptive. Similarly, the number of males increases in species with shorter birth seasons, suggesting that greater breeding seasonality makes defense of females more difficult for male primates. When comparing primate suborders, we found only weak evidence for differences in traits between haplorhines and strepsirrhines, and including suborder in the statistical models did not affect our conclusions or give compelling evidence for different effects in haplorhines and strepsirrhines. Collectively, these results demonstrate that male monopolization is driven primarily by the number of females in groups, and secondarily by synchrony of female reproduction within groups.
authors: The Law School, University of Chicago, Chicago, Illinois, United States of America.
authors: Laurel Mariah
authors: LM
authors: Carnes
authors: Charles L
authors: CL
authors: Nunn
authors: Rebecca J
authors: RJ
authors: Lewis
references: Anim Behav. 1999 Aug;58(2):229-246
references: 10458874
references: Folia Primatol (Basel). 1983;40(1-2):145-60
references: 6862323
references: Trends Ecol Evol. 1998 Jul 1;13(7):288-92
references: 21238306
references: Nature. 1966 Jun 18;210(5042):1200-3
references: 6007804
references: J Reprod Fertil. 1975 Jun;43(3):419-34
references: 806684
references: Nature. 1999 Oct 28;401(6756):877-84
references: 10553904
references: Trends Ecol Evol. 2004 Sep;19(9):475-81
references: 16701310
references: Proc Natl Acad Sci U S A. 1994 Oct 11;91(21):9941-5
references: 7937922
references: Primates. 2010 Jul;51(3):241-9
references: 20339901
references: Hum Nat. 1996 Jun;7(2):105-23
references: 24203316
references: Physiol Behav. 1991 Jan;49(1):47-52
references: 2017479
references: Am Nat. 2002 Dec;160(6):712-26
references: 18707460
references: Anim Behav. 1997 Sep;54(3):737-46
references: 9299057
references: Science. 1972 May 26;176(4037):863-74
references: 17829291
references: Behav Ecol Sociobiol. 2008 Feb;62(4):627-638
references: 19816530
references: Anim Behav. 1998 Jan;55(1):163-9
references: 9480682
references: Biol Rev Camb Philos Soc. 2000 Aug;75(3):405-35
references: 11034017
references: Oecologia. 2007 Nov;154(1):227-36
references: 17713792
references: Am Nat. 1999 Mar;153(3):315-331
references: 29585975
references: Am J Phys Anthropol. 2007 Feb;132(2):267-77
references: 17133430
references: Am J Primatol. 1996;38(4):315-332
references: 31918481
references: Physiol Biochem Zool. 2008 Sep-Oct;81(5):526-50
references: 18754728
references: Heredity (Edinb). 1948 Dec;2(Pt. 3):349-68
references: 18103134
references: Proc Biol Sci. 2004 Apr 22;271(1541):819-26
references: 15255100
references: Nature. 1988 Oct 6;335(6190):541-3
references: 3047588
references: Nature. 1978 May 18;273(5659):191-5
references: 347308
references: Behav Ecol. 2008 Nov;19(6):1150-1158
references: 19018288
references: Primates. 2009 Jan;50(1):12-22
references: 19142700
references: Science. 1977 Jul 15;197(4300):215-23
references: 327542
references: Science. 2000 Jun 30;288(5475):2349-50
references: 10875916
references: Trends Ecol Evol. 1994 Mar;9(3):98-102
references: 21236786
references: Proc R Soc Lond B Biol Sci. 1989 May 22;236(1285):339-72
references: 2567517
references: Mol Biol Evol. 2007 Jan;24(1):146-58
references: 17065595
references: Proc Biol Sci. 2004 Feb 7;271 Suppl 3:S101-3
references: 15101432
references: Naturwissenschaften. 2008 Jul;95(7):625-30
references: 18392796
references: Am J Phys Anthropol. 2003;Suppl 37:2-13
references: 14666531
references: Am J Phys Anthropol. 2005 Oct;128(2):399-414
references: 15838833
references: J Theor Biol. 1971 May;31(2):295-311
references: 5104951
references: Proc Biol Sci. 2001 May 22;268(1471):1049-53
references: 11375089