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Bioavailable N and P release rates by juveniles and adults of three Daphnia taxa (D. hyalina, D. galeata and its interspecific hybrids D. hyalina × galeata) were measured to assess the effect of weight and interspecific differences on these rates in Daphnia. Immobilized Scenedesmus obliquus cells were used to estimate the release rates. The specific release rate of N varied between 5.19–5.71 µg N mg C-1 h-1 for juveniles and 3.00–3.42 µg N mg C-1 h-1 for adults. P excretion rate ranged between 1.93–2.37 µg P mg C-1 h-1 for juveniles and 1.00–1.24 µg P mg C-1 h-1 for adults. Our results show that the taxonomic affiliation of Daphnia individuals did not affect their N and P release rates. [KEYWORDS: N and P release rates; Daphnia; Scenedesmus; species-specific effects Life-history variation; phosphorus release; nutrient limitation; nitrogen-excretion; ammonia excretion; planktonic algae; nitrite uptake; food quality; zooplankton; phytoplankton]
Original languageEnglish
Pages (from-to)147-155
Issue number1-3
StatePublished - 1998

ID: 256301