Two investigators, G. Thorson in the example of invertebrates and T.S. Rass in the example of fishes, simultaneously documented an increase in the egg size of aquatic organisms with a decrease in water temperature. This pattern is related to two different phenomena, which are erroneously united into the well-known rule of Thorson-Rass. Thorson’s rule describes ecological processes linked to the change in larval biology and morphology that are caused by the natural selective pressure on different types of larval development. Rass’ rule describes physiological processes and manifests itself in comparisons within populations, between populations of the same species, and between closely related species, and it is not associated with the change of type of reproductive strategy or with the biology of early development stages. Thorson’s rule describes the relative abundance of both r-and K-strategists within an r-K-continuum, whereas Rass’ rule characterizes the relative position of both groups within the continuum.
Russian Journal of Marine Biology – Springer Journals
Published: Jul 5, 2006
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