Within a taxonomic group, larger populations and species were found in colder settings, while smaller populations and species were located in warmer environments. The goal was to put Bergmann's rule to the test. With reversed sexual size dimorphism, it was tested in the millipede genus Centrobolus (SSD). Body lengths (mm) and widths (mm) were measured in 22 Centrobolus species (mm). Longitude was linked to female length (r=0.46, Z score=2.15, r2=0.21, n=22, p=0.02), female width (r=0.41, Z score=1.91, n=22, p=0.03), male length (r=0.43, Z score= 2.01, n=22, p=0.02), and male width (r=0.28, Z score=1.27, n=22, p=0.010). Longitude was linked with female volume (r=0.29, Z score=1.31, n=22, p0.10). The smaller species (C. digrammus) appeared in a westerly direction (18.4°E), whereas the larger species (C. inscriptus and C. anulatus) occurred in an easterly direction (31.7°E). All medium-sized species distributed between these two longitudes. The average annual temperature in different types of locations was related to body size. Temperature and species size were shown to be related (r=0.55, Z score=2.69, n=22, p0.01). Female size (volume) and temperature had a positive link (r=0.49, Z score=2.31, n=22, p=0.01), as did male size (r=0.48, Z score=2.26, n=22, p=0.01). Male length (r=0.57, Z score=2.79, n=22, p0.01), male width (r=0.42, Z score=1.94, n=22, p=0.03), female length (r=0.57, Z score= 2.79, n=22, p0.01), female width (r=0.49, Z score=2.31, n=22, p=0.01), and female width and temperature (r=0.49, Z score=2.31, n These univoltine arthropods' size grows by an order of magnitude with temperature, as it does in terrestrial arthropods. In keeping with latitude-size trends in terrestrial arthropods, this was a reverse Bergmann clade.
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/5878
