Similarity principles for the biology of pelagic animals

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Abstract
A similarity principle is formulated according to which the statistical pattern of the pelagic population is identical in all scales sufficiently large in comparison with the molecular one. From this principle, a power law is obtained analytically for the pelagic animal biomass distribution over the animal sizes. A hypothesis is presented according to which, under fixed external conditions, the O2 exchange intensity of an animal is governed only by its mass and density and by the specific absorbing capacity of the animal''s respiratory organ. From this hypothesis a power law is obtained by the method of dimensional analysis for the exchange intensity mass dependence. The known empirical values of the exponent of this power law are interpreted as an indication that the O2-absorbing organs of the animals can be represented as so-called fractal surfaces. The biological principle of the decrease in specific exchange intensity with increase in animal mass is discussed.

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