Copulation duration variance in mate-guarding worm-like millipedes was examined as one of many determining factors of copulation duration across arthropods. In worm-like millipedes, the goal was to compute copulation duration allometry. The null hypothesis was that mean copulation duration and variance were unaffected by body mass. The length of copulation and the standard deviation squared for 20 millipede populations were taken from the literature. The length of copulation was highly associated to variation (r=0.87, Z score= 5.74, n=21, p0.01). These included forest species such as Gigantowales chisholmi (0.09) and Alloporus uncinatus (Mazowe-Hwange) (4238.01). (C. anulatus, C. inscriptus, C. ruber). Female mass (r=0.68, Z score=2.89, n=15, p0.01) was shown to be linked with copulation duration variance (r=0.68, Z score=2.89, n=15, p0.01). Male mass (r=0.80, Z score=3.85, n=15, p0.01) was shown to be linked with copulation length variance (r=0.80, Z score=3.85, n=15, p0.01). These relationships were not significantly different (z=-0.67, n=15, 15, p=0.50). Male mass was only slightly linked with copulation duration (r=0.40, Z score=1.55, n=16, p=0.06). Female mass was not associated to copulation duration (r=0.33, Z score=1.22, n=16, p=0.11). These correlation coefficients were identical (z=0.23, n=16, 16, p=0.82). When intraspecific variation in copulation length was controlled, it was shown that it was negatively related to size and connected with the severity of sperm competition (equal). The duration of copulation is controlled by males based on the mass and intensity of sperm competition.
Author(s) Details:
Mark Cooper,
School of Animal, Plant & Environmental Sciences University of the
Witwatersrand, Johannesburg 2050, South Africa.
Please see the link here: https://stm.bookpi.org/NVBS-V9/article/view/5867
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