Abstract - Journal of Crustacean Biology, 1990


Four lines (three selfing and one sexual) of the tadpole shrimp, Triops longicaudatus (LeConte), reared in the laboratoryexhibited significant reductions in growth and egg production with increasing density (5, 10, and 16 shrimp per 40 liter aquarium). Growth and fecundity was similar within the two morphologically distinguishable forms (long and short) whereas the long form shrimp grew larger but produced fewer eggs than the short form shrimp. Growth and age at death did not differ between the two reproductive classes. The sexual shrimp did show lower average egg production than the three selfing lines. Life-history trade offs were not apparent between egg production, growth, and survivorship within any of the four lines examined. However, a nonsignificant negative correlation was found between mean egg production and growth among the four shrimp lines. These ecological results combined with electrophoretic and morphological measures reveal a consistent pattern of differences between the long and short forms of T. longicaudatus



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