期刊
ECOLOGY AND EVOLUTION
卷 5, 期 5, 页码 1011-1024出版社
WILEY
DOI: 10.1002/ece3.1241
关键词
Cell size; nutrient limitation; phytoplankton; temperature
资金
- DAAD (Deutscher Akademischer Austauschdienst = German Academic Exchange Service)
- Tanzania Ministry of Education and Vocational Training [A/10/90415]
- institutional budget of Ulrich Sommer (Helmholtz Centre for Ocean Research/Geomar)
Cell size is one of the ecologically most important traits of phytoplankton. The cell size variation is frequently related to temperature and nutrient limitation. In order to disentangle the role of both factors, an experiment was conducted to determine the possible interactions of these factors. Baltic Sea water containing the natural plankton community was used. We performed a factorial combined experiment of temperature, type of nutrient limitation (N vs. P), and strength of nutrient limitation. The type of nutrient limitation was manipulated by altering the N:P ratio of the medium (balanced, N and P limitation) and strength by the dilution rate (0% and 50%) of the semicontinuous cultures. The negative effect of temperature on cell size was strongest under N limitation, intermediate under P limitation, and weakest when N and P were supplied at balanced ratios. However, temperature also influenced the intensity of nutrient imitation, because at higher temperature there was a tendency for dissolved nutrient concentrations to be lower, while the C:N or C:P ratio being higher...higher at identical dilution rates and medium composition. Analyzing the response ofcell size to C:N ratios (as index of N limitation) and C:P ratios (as index of P limitation) indicated a clear dominance of the nutrient effect over the direct temperature effect, although the temperature effect was also significant.
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