Most D. recens females remate within a few days and use the sperm of multiple males to sire their offspring. We found that the proportion of females that produced both wild-type and dark-eyed offspring, indicative of multiple mating, increased with the number of days the flies were held together ( ? 5 2 = 27 , p < 0.0001), and that this was owing to a lower number of multiply mated females in the 1-day treatment (? 2 = 20, p < 0.0001; figure 3; electronic supplementary material, figure S7). Whether the wild-type eyed males in the cage were ST or SR did not affect this pattern ( ? 6 2 = 10 , p = 0.13). Using the occurrence of mixed broods is a conservative estimate of remating rate, as we cannot detect when females mate with males of the same eye colour genotype or mate twice but do not use the sperm of both malesbining SR and ST cages within each day, when flies are kept together for 24 h, 20% of females produced mixed broods, indicating they mated with both dark and wild-type males. This suggests that about 40% of females mated at least twice within 24 h, because we only detected half of the broods produced from double matings (95% CI 0.32–0.47). 66% mated at least twice) and increased to approximately 50% after 3 days, suggesting that all of the females had mated twice (figure 3).
When the a lady friends double and each mating is with a great arbitrary male, half of the time she’d be anticipated to help you lover which have each other dark and you can nuts-types of males (and you may 1 / 2 of committed she’d partner that have a couple nuts-kind of or a couple dark-eyed men)
Shape 3. Paternity analyses throughout the jizz competition crate try out suggest women companion multiply. Found is the fraction of women you to lead each other ebony and you may wild-kind of young children, indicating they had mated that have both kind of males, broke up by the quantity of days the new flies happened together and male tester genotype (SR or ST). The brand new error bars suggest the latest 95% binomial depend on interval. (On the web variation from inside the the color.)
These investigation also provide information on how people explore cum. In the event that girls one partner more twice utilize the jizz from people males similarly, upcoming extremely otherwise most of the lady is to eventually sire combined broods. This is because when a woman mates proliferate and hookup apps for married you will uses new jizz of all out-of the girl mates equally, the probability you to definitely she supplies children sired from the letter guys regarding a comparable type = (1/2) (n?1) , where n is the number of matings. Significantly, so it matter easily declines so you’re able to no since n gets large. Yet not, i note that the brand new regularity of females promoting blended broods profile out of to fifty% (figure 3). This indicates the energetic number of friends such females try n = dos and that people just use the latest cum of one’s past several males it mated having.
The fresh new ratio of females you to delivered mixed broods risen to 33% just after two days (approx
We find that in conditions of sperm competition, SR males sire fewer offspring than ST males. In cages where flies were kept together for 2, 3, 4 or 6 days, ST males sired a greater proportion of the offspring than SR males (each p < 0.05; figure 4). The fraction of offspring by SR versus ST males did not differ significantly in cages where flies were kept together for 1 or 10 days (each p > 0.05). In the cages where the flies were kept together for 1 day, the dark males sired more offspring regardless of the SR status of the tester wild-type males (figure 4); it is unclear why this is because our mating experiments described above found no preference of dark females for dark males. This effect goes away after day 1, where all of the cages with ST tester males have approximately 50% wild-type offspring, as expected if there was no preference for male eye colour.