Species-specific N and P release rates in Daphnia |
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Authors: | Carmen Pérez-martínez Ramesh D. Gulati |
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Affiliation: | (1) Present address: Netherlands Institute of Ecology, Centre for Limnology, Rijksstraatweg 6, 3631 AC Nieuwersluis, The Netherlands |
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Abstract: | 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 g N mg C-1 h-1 for juveniles and 3.00–3.42 g N mg C-1 h-1 for adults. P excretion rate ranged between 1.93–2.37 g P mg C-1 h-1 for juveniles and 1.00–1.24 g 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. |
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Keywords: | N and P release rates Daphnia Scenedesmus species-specific effects |
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