Why do female Pied Flycatchers mate with already mated
males: deception or restricted mate sampling?
Any females that these males refused to mate in the first run were then paired with other males that had not mated
within the past two days.
When the female died, the number of times it had mated
was ascertained by counting the spermatophores present in her bursa copulatrix.
They also analysed females' RNA to compare the genes expressed in females mated
to males of different strains.
In various studies, he and a colleague compared aspects of mating, for example, the length of time that the snails courted before copulating, when snails mated
with and without dart piercing.
Data were analyzed using a contingency test with re-mating treatment (1 d, 3 d and 30 d) as the factor, and mating outcomes (mated
twice) as the response, to determine if mating a second time was dependent on the mating treatment.
In the first experiment, to determine mating frequency of individual females caged with multiple males, the 41 females mated
to control males lived a mean of 5.
The following morning we discarded the males and transferred the mated
females to screen cages (30 cm cubes, 50-75 females per cage).
For matings that were not disrupted by our censuses, 50% of males and 44% of females whose matings ended before the 1400 h census mated
again later the same day.
pair of black-tailed godwits may fly off to separate wintering grounds a thousand kilometers apart, but they can return to their breeding grounds almost simultaneously, a migration survey has revealed.
The researchers did a second round of transplants, this time treating some of the mated
beetles' corpora allata with a compound that blocks the production of juvenile hormone.
The researchers explain the dilution of DNA links among males in part by noting that various males, rather than just an alpha male, in each group produced offspring and outsiders occasionally mated