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Competition and Habitat Partitioning By the Giant Freshwater Prawn Macrobrachium Rosenbergii (De Man) (Decapoda, Palaemonidae) 1)

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Under certain predictable conditions Macrobrachium rosenbergii kill one another. Under other "field" conditions these prawns appear to segregate by molt state into different microhabitats. Experiments were conducted to determine if this segregation was the result of competition or a change in habitat selection associated with a change in molt state. Apparently segregation was the result of competition, and not the result of a change in habitat preference associated with a change in molt state. The process of segregation by molt state seemed to increase the chance that a prawn in a susceptible molt state would survive that period of vulnerability.

Affiliations: 1: Department of Genetics, University of Hawaii, Honolulu, Hawaii, U.S.A.


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