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PHYSIOECOLOGY OF TROPICAL MARINE COPEPODS. II. SEX RATIOS BY EUNA A. MOORE Biology Department, University of the West Indies, Barbados, West Indies and FINN SANDER Bellairs Research Institute of McGill University, St. James, Barbados, West Indies INTRODUCTION The observed phenomenon of all-female populations, or low percent males in populations, is of more than passing biological interest, especially in those cases where reproduction is accomplished sexually, interest being focused on the evolutionary significance and the adaptive value of the sex disparity. In the marine environment the incidence of this phenomenon increases with depth and a significantly large number of species have been described from females only (Brodsky, 1950), while the reverse is the case where only the males are known. The vanishing illumination in the bathypelagic and abyssal regions of the ocean at once eliminate the phototrophic portions of the food chain and in- crease the difficulty of catch for actively hunting organisms. Survival of the species would therefore be more critically dependent on feeding efficiency and biological conservation. It has been suggested (Mednikov, 1961) that the various morphological, behavioural and life history modifications of the males constitute a form of biological conservation aimed at ensuring the females a
Crustaceana – Brill
Published: Jan 1, 1983
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