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Aquatic Ecology

, Volume 34, Issue 2, pp 143–153 | Cite as

The seasonal dynamics of Copidodiaptomus numidicus (Gurney, 1909) and Thermocyclops dybowskii (Lande, 1890) in Castelo-do-Bode Reservoir

  • Maria-José Caramujo
  • Maria-José Boavida
Article

Abstract

We investigated the population dynamics of Copidodiaptomus numidicus (Copepoda: Calanoida) and Thermocyclops dybowskii (Copepoda: Cyclopoida) in Castelo-do-Bode Reservoir (Portugal). Both species in the reservoir were regulated mainly by food availability during the summers of 1993 and 1994. C. numidicus was always more abundant than T. dybowskii in the reservoir. C. numidicus produced two generations during the sampling period of both years whereas T. dybowskii produced two and three generations in 1993 and 1994, respectively. Because of high temperatures and low rainfall in 1994, the reservoir was more eutrophic than in 1993. Higher clutch size and a higher percentage of ovigerous females suggest that both species were benefiting from better feeding conditions in 1994. Despite this, population growth was reduced in 1994 relatively to 1993. Vertebrate predation and predation by copepods seem to have been minor factors in explaining this decline. However, the presence of Mesostoma sp. in the reservoir may have contributed to the reduction of both copepod populations during specific periods in 1994 although the calanoid was more affected than the cyclopoid by this predation.

Copepoda flatworms food limitation index mate limitation index Mesostoma 

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Copyright information

© Kluwer Academic Publishers 2000

Authors and Affiliations

  • Maria-José Caramujo
    • 1
  • Maria-José Boavida
    • 2
  1. 1.Dept. Zoologia, Faculdade de CiênciasUniv. LisboaPortugal (E-mail
  2. 2.Dept. Zoologia and Centro de Biologia Ambiental, Faculdade de CiênciasUniv. LisboaLisboaPortugal (E-mail

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