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JPR Advance Access published online on April 30, 2004
Journal of Plankton Research, doi:10.1093/plankt/fbh080
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Received December 15, 2003
Accepted March 24, 2004

Article

Life history, biomass and production of two planktonic cyclopoid copepods in a shallow subtropical reservoir

Maria da Graça Gama Melão 1* Odete Rocha 2

1 Universidade Federal de São Carlos (UFSCar), Departamento de Hidrobiologia, 13565-905, São Carlos, SP, Brazil
2 UFSCar, Departamento de Ecologia e Biologia Evolutiva, 13565-905, São Carlos, SP, Brazil

* To whom correspondence should be addressed. E-mail: dmgm{at}power.ufscar.br.


  Abstract

Two planktonic cyclopoid copepods (Tropocyclops prasinus and Mesocyclops longisetus) were raised in the laboratory to obtain life history information (duration of embryonic and postembryonic development, reproductive performance, longevity, and stage-specific length and weight values). Animals were maintained at 20 and 25°C, and fed ad libidum. Development times were temperature dependent when food was not limiting, with shorter periods of embryonic and postembryonic development and decreased longevity at 25°C. Laboratory data on the duration of development and biomass, together with population dynamics data obtained in the field, were used to estimate summer and winter's biomass and production of these species in a shallow reservoir Lagoa Dourada, Brazil. Maximum production rate of T. prasinus, attained during summer was 2.8mgDW m-3 day-1 and the highest daily production:biomass (P:B) ratio was 0.29, whereas for M. longisetus maximum production rate was 1.4mgDW m-3 day-1 and the highest daily P:B ratio was 0.39, in the winter. Over short-time intervals (ever other day) there was great variability of the species production rates. Species production rates were low compared to values reported in the literature for the same or other species of equivalent sized copepods from both tropical and subtropical regions.


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