Postcopulatory sexual selection and the evolution of shape complexity in the carnivoran baculum

被引:15
作者
Brassey, Charlotte A. [1 ]
Behnsen, Julia [2 ]
Gardiner, James D. [3 ]
机构
[1] Manchester Metropolitan Univ, Dept Nat Sci, Manchester M1 5GD, Lancs, England
[2] Univ Manchester, Manchester Xray Imaging Facil, Manchester M13 9PL, Lancs, England
[3] Univ Liverpool, Inst Ageing & Chron Dis, Liverpool L7 8TX, Merseyside, England
基金
英国生物技术与生命科学研究理事会; 英国工程与自然科学研究理事会;
关键词
baculum; carnivore; sexual selection; shape complexity; evolution; genital; RELATIVE TESTIS SIZE; SPERM COMPETITION; MORPHOLOGICAL VARIABILITY; MAMMALIAN BACULUM; SOCIAL MONOGAMY; OS-PENIS; MODEL; HYPOTHESES; MUSTELIDAE; QUALITY;
D O I
10.1098/rspb.2020.1883
中图分类号
Q [生物科学];
学科分类号
07 ; 0710 ; 09 ;
摘要
The baculum is an enigmatic bone within the mammalian glans penis, and the driving forces behind its often bizarre shape have captivated evolutionary biologists for over a century. Hypotheses for the function of the baculum include aiding in intromission, stimulating females and assisting with prolonged mating. Previous attempts to test these hypotheses have focused on the gross size of the baculum and have failed to reach a consensus. We conducted three-dimensional imaging and apply a new method to quantify three-dimensional shape complexity in the carnivoran baculum. We show that socially monogamous species are evolving towards complex-shaped bacula, whereas group-living species are evolving towards simple bacula. Overall three-dimensional baculum shape complexity is not related to relative testes mass, but tip complexity is higher in induced ovulators and species engaging in prolonged copulation. Our study provides evidence of postcopulatory sexual selection pressures driving three-dimensional shape complexity in the carnivore baculum.
引用
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页数:10
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