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Body size distributions of eastern European Diptera

Ulrich W., Szpila K.

Polish Journal of Ecology

2008

Vol. 56, nr 4

557-568

Weight distributions of Eastern European Diptera (estimated from 7966 species body length data compiled from Stackelberg and Nartshuk 1969, 1970) differ from respective distributions of Coleoptera and Hymenoptera. Nematoceran size distributions were predominantly right skewed while the Brachycera tended to have symmetric and left skewed distributions. Skeweness of size distributions was for Nematocera positively and for Brachycera negatively correlated with genus mean body weight. Genera of smaller mean body weight were significantly species richer than larger sized genera. Our findings are consistent with an evolutionary model that assumes body size dependent speciation and extinction rates.

Can velocity affect growth and fecundity of facultative riverine fish species?

Penczak T.

Polish Journal of Ecology

2007

Vol. 55, nr 2

357-366

The length and body weight at subsequent annuli of four facultative riverine fish species: roach (Rutilus rutilus L.), perch (Perca fluviatilis L.), bream (Abramis brama L.) and pike (Esox lucius L.) living in lakes and rivers were compared on the basis of published data. Pike grew better in lakes (significant differences in length, and some for weight), but the other species in rivers. However, significant differences between medians were observed in all cases only for body length of roach, in many cases for the length of bream, as well as a few for its weight, and no one for perch. Comparable data on relative fecundity in both habitats were available for roach and pike. Pike females produced more eggs in lakes, but roach - in rivers, and the differences were significant.