Carbon, nitrogen, and phosphorus content of freshwater zooplankton

Carbon, nitrogen and phosphorus stoichiometry of crustacean zooplankton in the Baltic Sea: implications for nutrient recycling

The carbon (C), nitrogen (N) and phosphorus (P) contents (% of dry weight) of some crustacean zooplankton were studied in the Baltic Sea. The copepod Acartia sp. had a stable C and N content (48.3 ± 0.8% C, 12.4 ± 0.2% N, C:N ratio 4.5 ± 0.1). The P content was variable (1–2%), probably depending on developmental stage and season. Copepods accumulating fat, like Pseudocalanus minutus elongatus,...

Content of carbon, nitrogen, oxygen, sulfur and phosphorus in native aquatic and cultured bacteria

The content of carbon, nitrogen, oxygen, phosphorus and sulfur was measured in individual cells from 6 native aquatic samples and 4 samples of cultured bacteria by X-ray microanalysis using a transmission electron microscope (TEM). The molar C N:P ratio for the pooled sample was 50:lO:l From length and width measurements of unfixed air-dried cells we estimated cell volumes over a total range of...

3 Freshwater Zooplankton

Mineralizable phosphorus, nitrogen, and carbon relationships in dairy manure at various carbon-to-phosphorus ratios.

Phosphorus (P) in animal manure can be an important nutrient for crops or an environmental contaminant if in excess. Organic P in dairy manure may add to the environmentally bioactive P pools upon mineralization. A 353d incubation study of manures containing C:P between 83 and 130:1 was conducted to determine linkages between C and P transformations and the effects of C:P on the immobilization-...

Relationship between Livestock Nutrition and Excreted Nitrogen and Phosphorus Content