. Ecological animal geography; an authorized, rewritten edition based on Tiergeographie auf ockologischer grundlage . Fig. 100/—Quantitative distribution of Crustacea in Lake Sakrow near Pots- dam, in number of individuals per liter. Depth in meters at left, corresponding temperatures at right; T., thermocline. After Behrens. even below 10 m., in one case as low as 25 m.; only a few individuals of Anuraea aculeata are found above 10 m., the majority live at about 25 The nannoplankton is similarly stratified. Such stratification is regularly changed by night migration when many forms move
. Ecological animal geography; an authorized, rewritten edition based on Tiergeographie auf ockologischer grundlage . Fig. 100/—Quantitative distribution of Crustacea in Lake Sakrow near Pots- dam, in number of individuals per liter. Depth in meters at left, corresponding temperatures at right; T., thermocline. After Behrens. even below 10 m., in one case as low as 25 m.; only a few individuals of Anuraea aculeata are found above 10 m., the majority live at about 25 The nannoplankton is similarly stratified. Such stratification is regularly changed by night migration when many forms move toward the surface, and is re-formed at daybreak. A seasonal variation in the appearance of the plankton is also brought about by the change in body form to which various plankton animals, especially Cladocera and the rotifers, as well as the flagellate Ceratium hirundinella, are subject because of the influence of the amount of nutriment and indirectly because of the temperature and light. Such cyclomorphoses naturally appear in a most pronounced manner where great variations of temperature, and consequently
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Keywords: ., bookcentury1900, bookcollectionbiodive, booksubjectanimalecology
