Quantitative genetic models of sexual conflict based on interacting phenotypes. What these lizards portray is the rock-paper-scissors game. However, these previous measurements were taken in a different population in Hidalgo, Mexico; A. The present study has indirectly shed light on this issue. The present study documents that the same mechanism operates in another damselfly, Hetaerina americana. Diagram of human sperm cell. Oxford University Press is a department of the University of Oxford.
Researchers have suggested that males produce more and higher quality sperm after spending time apart from their partners, implying that males are responding to an increased risk of sperm competition,  although this view has been challenged in recent years.
Scent marking increases male reproductive success in wild house mice
Urine marking increases with the presence of low objects in a familiar environment Peden and Timberlake Genes that act late in life could explain why women have poorer health than men in older age, according to new research. Bursal sperm in all months was completely emptied for most females H. She is advertising availability and receptivity via her urine marks, and marks more in the presence of preferred male urine Taylor et al. This area of sensillum contact was deduced from those seven interrupted pairs that were used to see how male and female genitalia were accommodated. Urine marking is very common in mammals, and it has become adapted for use in a variety of contexts and may have more than one function in any given species.