Life history of Daphnia galeata in a hypertrophic reservoir and consequences of non=consumptive mortality for the initiation of a midsummer decline

S. Hülsmann, H. Voigt

    Research output: Contribution to journal/periodicalArticleScientificpeer-review

    Abstract

    Field and laboratory investigations were combined in a 2-year study on the initiation of a midsummer decline of Daphnia galeata Sars in a hypertrophic reservoir. Quantitative field samples were taken twice a week, and, adult and juvenile mortality rates were calculated. Patterns of reproduction and survival of daphnids born during spring and early summer under fluctuating food conditions were determined in life-table experiments. 2. The abundance of Daphnia increased strongly in early May and declined in June 1998 (midsummer decline). In 1999, Daphnia density increased only slowly in spring and remained constantly high throughout the summer. 3. Food conditions (concentrations of POC
    Original languageEnglish
    Pages (from-to)2313-2324
    JournalFreshwater Biology
    Volume47
    Issue number12
    DOIs
    Publication statusPublished - 2002

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