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Monitoring of copulations began 111 days before the start of incubation (25 Feb 2010) for the first nest of the 2010 season.
Washington, Feb 13 ( ANI ): A sea slug's has an unusual mating behavior - it discards its penis after copulation, grows a new one, and has sex the next day.
Future studies should establish empirically that plugs either prevent subsequent copulations or reduce passage of sperm in subsequent inseminations.
A total of 39 successful matings and 4 aborted copulations were recorded (all or in part) over the 2-season course of the investigation.
Sperm competition in Pholcus phalangioides (Fuesslin, 1775) (Araneae, Pholcidae)--shorter copulations gain higher paternity reward than first copulations.
The duration of copulation is an important trait in this respect because it may, for example, determine the quantity of sperm transferred, aid removal of sperm from previous males, increase the probability that females will store and use the sperm or, for long copulations decrease the opportunities for females to copulation with another male.
Given the examples for both short and long copulations, the question arises: what is the function of long copulation duration in wolf spiders, and in particular in the wolf spider, Pardosa agrestis?
All copulations occurred inside nests, and no sexual interaction between males and females were observed in other places of the terrarium.
No copulations or copula-tion attempts were observed during observation periods.
The researchers concluded that the newly discovered "self-plugging" mechanism represents a female adaptation to sexual conflict through the prevention of unwanted and excessive copulations.
Male Sharp-tailed Grouse (Tympanuchus phasianellus) holding central territories obtained more copulations than peripheral males (Gratson et al.
The masculinized females attempted male-male copulations by thrusting their gonopodium at other males in the same tank suggesting that 11-KT has a strong effect on reproductive behavior (Krotzer, 1990).