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Books > Earth & environment > Earth sciences > The hydrosphere > Oceanography (seas)
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A Comparative Atlas of Zooplankton - Biological Patterns in the Oceans (Paperback, Softcover reprint of the original 1st ed. 1983)
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A Comparative Atlas of Zooplankton - Biological Patterns in the Oceans (Paperback, Softcover reprint of the original 1st ed. 1983)
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It is a well-known faet, that both the geographie distribution and
the speeiation of plankton are produets of the geologieal history
of the oeeans, the eontinental barriers, the eurrent patterns and
the limitation of survival of individual speeies and populations by
both biotie and abiotie environmental eonditions. The geographie
distribution is also the produet of the mobility of populations,
the seleetive pressure and the time during whieh a taxon has
existed. A taxon eonsists of a population, or a group of
populations, suffieiently distinet to be provided with a name, to
be ranked in a definite eategory and to establish a geographie
distribution. Eaeh taxon forms part of biological evolution, and is
therefore never sharply delimited in time. Aneestors always
influenee the dispersal oftheir deseendants. Environmental
eonditons exert a natural seleetive influenee on eaeh population,
whieh results in the survival of the most adequately adapted pheno-
and genotypes at a partieular plaee and during a partieular period.
Consequently, seleetion determines the presenee of a phenotype, or
taxon, in an area at a eertain moment. In this way, the environment
determines the type of taxa, their abundanees, their seasonal
ehanges and survival in time. In a broad sense, mobility of
populations does not merely depend on migration and transport;
reproduetion, mortality and population dynamies also influenee the
mobility. In that sense, mobility eomprises all phenomena of
movement, including the ehanges in number of speeimens present at a
loeality.
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