Intra- and Interspecific Relations of the Factors and Nuls which Regulate the Vertical Distribution of Zooplankton
A mathematical model is presented representing the interaction of temperature, illumination, pressure, and a seasonal cycle in determining the vertical distribution of a number of species of oceanic copepods. For each environmental factor there is an index of “preferred” conditions and an index of sensitivity to departure from these. The variations of these indices diurnally and through the population are discussed. An attempt is made to characterize the behavior of species in relation to the depths which they occupy in the daytime and at night. The behavioral characteristics associated with diurnal migration are discussed and also the degree of variation of behavioral characteristics within the population of a species. Finally, an attempt is made to use the model to predict the relative abundance of a species in different geographic regions whose hydrographic conditions are known.
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Document Type: Research Article
Publication date: 1967-12-01
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