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Gloger's Rule and Pigmentation of Collembola
E. H. Rapoport
Vol. 23, No. 4 (Dec., 1969), pp. 622-626
Published by: Society for the Study of Evolution
Stable URL: http://www.jstor.org/stable/2406857
Page Count: 5
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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.
Evolution © 1969 Society for the Study of Evolution