The influence of fish-exuded chemical signals on the carbon budget of Daphnia

Stibor, Herwig, Jiri Machácek

Limnol. Oceanogr., 43(5), 1998, 997-1000 | DOI: 10.4319/lo.1998.43.5.0997

ABSTRACT: Respiration and carbon assimilation rates were measured in juvenile instars of Daphnia magna cultivated either in fish-treated or in control medium without fish exudates. Respiration and carbon assimilation rates increase proportionally to Daphnia body size. This relationship did not differ between fish-influenced and control daphnids throughout juvenile development. The results imply that observed life-history shifts in Daphnia exposed to fish exudates are facultative changes and not the result of changes in the carbon budget induced by other predator-induced defense mechanisms or experimental setups.

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