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A hypothesis on the origin and migration routes of the oligochaetes of the Nile Basin is presented. Five routes (but probably more than five waves) are recognized. Species found far from their origin (e.g. Gordiodrilus from the Upper Nile, found in Selima Oasis and Tripolitania) may represent an earlier wave than those that live closer to their source (e.g. Alma nilotica in the Delta and at Bahariya...
An interesting debate has been going on in recent years about the relationship between biomass andpopulation density of animals in ecosystems to explain the discrepancy between what is observed in global and in local/regional data sets. While it is assumed that larger animals are found in smaller numbers and smaller animals in larger numbers, giving a log/log curve with a negative slope, this holds...
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