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OBSERVATIONS ON THE NATURAL HISTORY AND EXPERIMENTS ON THE REPRODUCTIVE STRATEGY OF HARGERIA RAPAX (TANAIDACEA)

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ABSTRACT Information on the life cycle and seasonal ecology of Hargeria rapax, a tanaidacean common in coastal communities along the Atlantic shores of the southeastern United States and Gulf of Mexico, was obtained by systematically sampling the population in two tide pools located on Dauphin Island, Alabama, for 13 continuous months. Population size grew through spring, reached an abundance of > 10.0 individuals/cm2 by early summer and crashed by August. It remained below 1.0 individual/cm2 for the rest of the year. A migration to more optimal mesohaline conditions was proposed based on field and literature data to explain the rapid decrease and low numbers in population size. Females were present throughout the year, but numbers of gravid females peaked in June and January. Manca II stages were found only in the spring, suggesting that reproduction was successful only during this period. Males were few in number and occurred sporadically. Male to female ratios averaged 1:8. Laboratory cultures indicated that this tanaidacean has a protogynous reproductive strategy.

10.1163/193724089X00593
/content/journals/10.1163/193724089x00593
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/content/journals/10.1163/193724089x00593
2017-10-22

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