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Diel Vertical Migration of Zooplankton in Lakes and Oceans - causal explanations and adaptive significances (Paperback, 2010 ed.)
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Diel Vertical Migration of Zooplankton in Lakes and Oceans - causal explanations and adaptive significances (Paperback, 2010 ed.)
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Whatever theory may be advanced to explain diurnal migration, the
underlying reactions involved must be demonstrated conc- sively in
the laboratory before the explanation can be ?nally accepted George
L. Clarke 1933 p. 434 In oceans and lakes, zooplankton often make
diel vertical migrations (DVM), descending at dawn and coming up
again in late afternoon and evening. The small animals cover
distances of 10-40 m in lakes or even a few hundred metres in the
open oceans. Although not as spectacular as migrations of birds or
the massive movements of large mammals over the African savannas,
the numbers involved are very large and the biomass exceed the bulk
of the African herds. For example, in the Antarctic oceans swarms
of "Krill" may cover kilometres across, with thousands of
individuals per cubic metre. These Euphausiids are food for whales,
the most bulky animals on earth. Zooplankton are key species in the
pelagic food web, intermediary between algae and ?sh, and thus
essential for the functioning of the pelagic community. Prey for
many, they have evolved diverse strategies of survival and DVM is
the most imp- tant one. Most ?sh are visually hunting predators and
need a high light intensity to detect the often transparent
animals. By moving down, the well-lit surface layers are avoided
but they have to come up again at night to feed on algae.
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