Mating Order Establishes Male Size Advantage in the Polygynandrous Millipede Centrobolus inscriptus Attems, 1928 | Chapter 7 | New Visions in Biological Science Vol.9

 The size assortative mating of a forest species of millipede belonging to the Order Spirobolida found along the eastern coast of southern Africa was investigated. The goals are to test for size benefits in mating by controlling for SSD in multiple mating. The duration of the first mating was positively related to male length (rs=0.30, n=46, P=0.04), but inversely connected to the duration of the second mating (rs=-0.35, n=46, P=0.02). When female width (z=-0.59, n=46, 46, p=0.60) and SSD (z=-1.08, n=46, 46, p=0.28) were adjusted, male length and copulation duration were different in first and second matings (z=3.13, n=46, 46, p0.01). Female choice based on male lengths explained a mating order effect from positive to negative size advantage in mating.

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/5871

Length and Width Correlations in Centrobolus Cook, 1897| Chapter 6 | New Visions in Biological Science Vol.9

 The size correlations of a forest genus of diplopods belonging to the order Spirobolida found along the eastern coast of southern Africa were investigated. The Pearson Correlation Coefficient Calculator was used to assess for correlations between four morphometric parameters for male and female lengths (mm) and widths (mm) collected from literature. In a study of 22 Centrobolus species, positive relationships were discovered. Male and female lengths and widths were shown to have strong positive connections. Female length and male width had a moderately favourable connection (r=0.72, Z score=3.91, n=22, p0.01). Male length and female width had a positive connection (r=0.62, Z score=3.16, n=22, p0.01). Male length/female width correlation (z=1.93, n=22, 22, p=0.05) differed from male length/female width correlation.

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/5869