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Predation of freshwater jellyfish on Bosmina : the consequences for population dynamics, body size, and morphology

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Abstract

Invertebrate predators may cause strong changes in behaviour, life-history, and morphology of prey species. However, little is known about the influence of jellyfish on such characteristics of their prey. This study analyses the impacts of the freshwater jellyfish Craspedacusta sowerbii on life history and morphological defenses in a population of the cladoceran Bosmina longirostris . Length of mucro and antennule, size-dependent number of eggs, size at maturity, and size of juveniles, adults, and egg-carrying females were investigated during a 23 days experiment using medusae-enriched and control enclosures filled with natural plankton populations. Significant differences in parameters investigated were found not only between treatments, but also within treatments over time. Changes in Bosmina life-history parameters and morphology in controls were probably due to predation by cyclopoid copepods. The significant increase in the size of adults and egg-carrying females as well as the increase in mucro and antennule length in medusae-enriched enclosures are discussed as defense strategies against the freshwater jellyfish.

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  1. Thomas Jankowski

    Present address: EAWAG, W & T, Ueberlandstrasse 133, CH-8600, Duebendorf, Switzerland

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  1. Department of Biology V, Aachen University, Worringer Weg 1, D-52056, Aachen, Germany

    Thomas Jankowski

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  1. Thomas Jankowski
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Jankowski, T. Predation of freshwater jellyfish on Bosmina : the consequences for population dynamics, body size, and morphology. Hydrobiologia 530, 521–528 (2004). https://doi.org/10.1007/s10750-004-2648-6

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