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1. Cell size and volume changed as a function of the type of resource limitation, with nitrogen-limited cells being smaller and less dense and phosphorus-limited cells being larger and more dense than non-limited cells.
2. The major biochemical constituents of the green alga Ankistrodesmus falcatus varied as a function of nitrogen or phosphorus limitation (15% of maximum growth rate) compared to cells growing at their maximum rate. Nitrogen-limited cells had much lower protein content and phosphorus-limited cells had higher carbohydrate and lipid contents than cells growing under no limitation.
3. Phosphorus-limited cells had a higher total lipid content than either nitrogen-limited or non-limited cells, but the lipid class composition was similar.
4. The protein : lipid ratio was lowest (0.38) in the nitrogen-limited cells, intermediate in the phosphorus-limited cells (0.44) and highest in the non-limited control cells (1.14).  相似文献
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1. Food quality was at least as important as food quantity for both fecundity and population growth responses of the cladoceran Daphnia pulicaria fed the green alga Ankistrodesmus falcatus grown under N limitation, P limitation, or non-limited condition.
2. The fecundity of D. pulicaria was reduced under conditions of low food quality (low N or low P) compared with that for animals fed control non-limited algae regardless of ration size. The reduced fecundity of D. pulicaria fed P-limited food could be partially alleviated by increasing the ration (hence, compensation), but such was not the case for animals fed N-limited food.
3. Population growth rates of D. pulicaria ( r max) were significantly reduced under conditions of low-quality food for both N-limited and P-limited algae. Population growth rates were unaffected by ration size, indicating no compensation.  相似文献
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