Graduate Thesis Or Dissertation
 

Factors influencing sex ratio in the estuarine copepod genus Eurytemora

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  • An investigation was conducted on factors influencing sex ratio in Eurytemora. Fifteen generations of brother/sister mating have produced family lines with a high proportion of either males or females of Eurytemora affinis. On this basis, a polygenic mechanism of sex determination is proposed for E. affinis. Laboratory experiments on the effect of salinity and temperature variation indicate that these factors act only on the parents to influence the sex ratio of their progeny but are not effective after the stage of egg-laying. The proportion of males produced increased with increases in salinity and temperature. Food density acts on the developmental stages of E. affinis to influence the sex ratio. More females were produced at higher food densities. Water quality and food type had no effect on sex ratio during development. Food type did have a strong effect on survival. How these factors interact in natural populations is unknown, since field data were available only for F. americana.
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