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Comments On the Population Structure of the Benthic Marine Isopod Politolana Concharum Collected By the Atlantic Sturgeon, Acipenser Oxyrhynchus

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Examination of the stomach contents of 17 Atlantic sturgeons, Acipenser oxyrhynchus, collected over a period extending from November 1992 through June 1994, yielded sufficient numbers (703) of the marine benthic isopod Politolana concharum for an evaluation of its population structure and first order population dynamics. Of the 703 isopods examined, 262 were clearly identified as male and 441 were female; yielding a sex ratio of 1:1.68. A second order polynomial regression, Y = 0.049X2+0.015X-0.066, was found to best describe the length-weight relationship of these isopods. Logarithmic transformation of these data allowed for the determination of the growth coefficient of this population sample, and a statistical test indicated that growth was isometric. The utility of using fish stomach content analysis to gain insights into the population structure and first order population dynamics of invertebrate prey items is discussed.

Affiliations: 1: Department of Biological Sciences, Lehman College of CUNY, 250 Bedford Park Boulevard West, Bronx, NY 10468-1589, U.S.A., The Department of Herpetology and Ichthyology, The American Museum of Natural History, Central Park West at 79th Street, New York, NY 10024, U.S.A.; 2: Science Department, SUNY Maritime College, 6 Pennyfield Avenue, Fort Schuyler, Bronx, NY 10465-4198, U.S.A.


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