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Gloger's Rule and Pigmentation of Collembola

E. H. Rapoport
Evolution
Vol. 23, No. 4 (Dec., 1969), pp. 622-626
DOI: 10.2307/2406857
Stable URL: http://www.jstor.org/stable/2406857
Page Count: 5
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Gloger's Rule and Pigmentation of Collembola
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Abstract

If complete faunal collections of Collembola are classified to dark and light species, a clear positive correlation appears between the percentage of dark forms and latitude, i.e., opposite to the case in homeotherm animals. Comparing the faunulae of 21 localities from equator to the poles, the correlation coefficient r = + 0.806 (P < .001) and the regression line is described by the equation Y = 18.48 + 0.676 X. If the number of individuals--instead of species--is computed, r increases to +0.911. The increase of the proportion of dark species is also shown at higher altitudes. Literature data from the Pyrenees and the Swiss Alps were considered from ca. 1000 to 3000 m above sea level and yielded r = +0.996 and r = +0.890, and the regression lines described by Y = 39.82 + 0.0098 X and Y = 26.96 + 0.0122 X, respectively. Temperature seems to be an important factor in determining the pigmentation of collembolan species.

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