Timing of Mating, Sperm Dynamics: DISCUSSION(2)

Lazenby-Cohen and Cockburn also questioned the accuracy of Scott and Tan’s data and conclusions, suggesting that they were unaware that these animals nested communally and that mating probably also occurred in the nests. As a result, they suggested that Scott and Tan may have underestimated the probability that radioactive contamination may have influenced their results. buy birth control online

In their study on mating strategies in Antechinus, Lazenby-Cohen and Cockburn examined the movements of several males and two females on 2 days during the mating period (Day 7 and Day 18 of the rut; equivalent to 13 and 24 August, respectively, in this study). On these days, males congregated in a few specific nest trees for much of their time, while the females foraged as usual. On Day 7 after the commencement of the rut, however, one female made a brief visit of ~45-min duration to a communal nest of males, during which time mating was considered to have occurred. This short interlude, however, contrasts dramatically with laboratory data suggesting that mating takes place over a number of hours in this species. Only 8% of females sampled in the present study had mated by Day 7 of the rut, which casts doubt on the suggestion by Lazenby-Cohen and Cockburn that the short foray they observed resulted in mating.

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