Roamers and Stayers: A Model on Male Mating Tactics and Mating Systems

1992 ◽  
Vol 139 (1) ◽  
pp. 177-189 ◽  
Author(s):  
Mikael Sandell ◽  
Olof Liberg
2005 ◽  
Vol 83 (12) ◽  
pp. 1638-1642 ◽  
Author(s):  
Albrecht I Schulte-Hostedde ◽  
Gary Burness

Sperm competition results in the evolution of ejaculate characteristics such as high sperm density, high motility, and fast sperm swimming speed. A fundamental assumption of sperm competition theory is that ejaculates with high motility and fast-swimming sperm have an advantage with respect to fertilization success. We tested this assumption by studying the fertilization dynamics of alternative mating tactics (cuckolders and parentals) of male bluegill (Lepomis macrochirus Rafinesque, 1819). Sneakers (cuckolders) have faster swimming sperm and a higher proportion of motile sperm immediately following sperm activation than do parentals; however, these variables decline more quickly over time in sneaker sperm than in the sperm of parental males. We used a controlled fertilization experiment to test the prediction that parental males will have higher fertilization success than sneakers late in the sperm activation cycle because of the reduced rate of decline in ejaculate quality over time. We found that as the time from sperm activation increases parental sperm fertilizes more eggs than the sperm of sneakers. Our results support the idea that fertilization success is higher when ejaculates contain a higher proportion of either motile sperm or faster swimming sperm, all else being equal. In addition, after controlling for time from sperm activation, we found a significant bias in fertilization success toward parental males, suggesting that cryptic female choice might play a role in fertilization dynamics.


2012 ◽  
Vol 153 (4) ◽  
pp. 999-1009 ◽  
Author(s):  
D. E. Chamberlain ◽  
M. Bocca ◽  
L. Migliore ◽  
E. Caprio ◽  
A. Rolando

2017 ◽  
Vol 233 (3) ◽  
pp. 219-226 ◽  
Author(s):  
Chun-Yen Lin ◽  
Chuan-Chin Chiao

1991 ◽  
Vol 69 (3) ◽  
pp. 604-613 ◽  
Author(s):  
Kevin M. O'Neill ◽  
Howard E. Evans ◽  
Louis B. Bjostad

The behaviour of males of the bumblebees Bombus nevadensis nevadensis, B. griseocollis, and B. rufocinctus was examined at sites in Colorado and Montana, U.S.A. Males of all three species defended individual mating territories on which they scent marked plants with cephalic chemicals, which we hypothesize to be sex pheromones. Males aggressively excluded conspecific males from the vicinity of scent-marked plants for several hours each day. At times on certain B. griseocollis territories, the great number of intruding males resulted in a near breakdown of the territorial system, with repeated aggressive interactions and turnover. In preliminary chemical analyses, dichloromethane extracts of heads of B. nevadensis and B. griseocollis were each dominated by single components, while those of B. rufocinctus, in each population studied, had three major components. Extracts of plant parts scent marked by males reveal the presence of the cephalic chemicals not present on unmarked control plants. Mating is initiated on or near territories. The behavioural and morphological correlates of male mating systems in the genus Bombus and other aculeate Hymenoptera are discussed.


2007 ◽  
Vol 274 (1612) ◽  
pp. 1009-1014 ◽  
Author(s):  
Martin N Muller ◽  
Sonya M Kahlenberg ◽  
Melissa Emery Thompson ◽  
Richard W Wrangham

For reasons that are not yet clear, male aggression against females occurs frequently among primates with promiscuous mating systems. Here, we test the sexual coercion hypothesis that male aggression functions to constrain female mate choice. We use 10 years of behavioural and endocrine data from a community of wild chimpanzees ( Pan troglodytes schweinfurthii ) to show that sexual coercion is the probable primary function of male aggression against females. Specifically, we show that male aggression is targeted towards the most fecund females, is associated with high male mating success and is costly for the victims. Such aggression can be viewed as a counter-strategy to female attempts at paternity confusion, and a cost of multi-male mating.


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