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Arthropods, 2020, 9(4): 164-170
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Article

Latitudinal gradient in species richness of Sphaerotherium

Mark Cooper
University of Johannesburg, Johannesburg, South Africa; School of Animal, Plant and Environmental Sciences, University of the Witwatersrand, Johannesburg 2050, South Africa

Received 18 April 2020;Accepted 25 May 2020;Published 1 December 2020
IAEES

Abstract
The Tropical Conservativism Hypothesis and Biogeographical Conservativism Hypothesis were tested in forest millipedes. Latitudinal diversity gradient (LDG) was measured in the genus Sphaerotherium in order to distinguish between the two hypotheses. There was a significant correlation between the number of species and latitudinal degrees away from the equator (r=-0.8701, r2=0.7571, n=46, p<0.00001). An evolutionary preference for temperate environments appearing to have led to climatic constraints on dispersal based primarily on precipitation seasonality gradients was suggested.

Keywords diversity;gradient;latitude;richness;species.



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