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JPR Advance Access published online on July 23, 2004
Journal of Plankton Research, doi:10.1093/plankt/fbh128
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Received March 11, 2004
Accepted July 8, 2004

Article

Diapause in the calanoid freshwater copepod Eudiaptomus graciloides

Martina Zeller 1, Raquel Jiménez-Melero 2, Barbara Santer 1*

1 Max Planck Institute of Limnology, D-24302 Plön, Germany, Post box 165
2 Departamento de Biología Animal, Biología Vegetal y Ecología. Universidad de Jaén. Paraje las Lagunillas s/n. 23071. Jaén, Spain.

* To whom correspondence should be addressed. E-mail: Santer{at}mpil-ploen.mpg.de.


  Abstract

The seasonal appearance and the intensity of diapausing egg production in Eudiaptomus graciloides in five lakes of different size and trophic level was studied. In all lakes, diapausing eggs were produced in autumn. In the large mesotrophic lake Selenter See, the population’s shift to production of diapausing eggs was more complete than in the other lakes. We examined day-length, temperature and food as proximate factors for the production of diapausing eggs with laboratory experiments. E. graciloides produced diapausing eggs in all treatments, but a significantly higher percentage of diapausing eggs was found under short day conditions except when algal food was abundant and temperature was high. To investigate the adaptive significance of diapause in E. graciloides, we compared the survival of adult and juvenile at different temperatures for E. graciloides with Eudiaptomus gracilis, a sympatric species that does not exhibit diapause. At 8 °C, adult E. graciloides survived better than adult E. gracilis, and exhibited reduced gut contents and accumulation of storage lipids, traits characteristic of adult diapause. E. graciloides nauplii did not reach the copepodid stage at 6 °C, but E. gracilis nauplii also exhibited high mortality and developed very slowly. We hypothesize that adult diapause and production of diapausing eggs facilitates survival of E. graciloides during cold periods and enhances coexistence with its congener, E. gracilis, in temperate zones.


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