Stoichiometric responses of phytoplankton species to the interactive effect of nutrient supply ratios and growth rates
Bi, Rong, Arndt, Carmen and Sommer, Ulrich (2012) Stoichiometric responses of phytoplankton species to the interactive effect of nutrient supply ratios and growth rates Journal of Phycology, 48 . pp. 539-549. DOI 10.1111/j.1529-8817.2012.01163.x.
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Text (Table S1. N and P cell quotas (QN and QP) of Rhodomonas sp., Isochrysis galbana, and Phaeodactylum tricornutum at five N:P supply ratios (10:1, 14:1, 24:1, 35:1, and 63:1) and four growth rates (µ). Numbers in parentheses are standard deviations calculate)
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Three species of phytoplankton, Rhodomonas sp., Phaeodactylum tricornutum Bohlin, and Isochrysis galbana Parke, were cultivated in semicontinuous culture to analyze the response of carbon (C):nitrogen (N):phosphorus (P) stoichiometry to the interactive effect of five N:P supply ratios and four growth rates (dilution rates). The relationship between cellular N and P quotas and growth rates fits well to both the Droop and Ågren’s functions for all species. We observed excess uptake of both N and P in the three species. N:P biomass ratios showed a significant positive relationship with N:P supply ratios across the entire range of growth rates, and N:P biomass ratios converged to an intermediate value independent of N:P supply ratios at higher growth rates. The effect of growth rates on N:P biomass ratios was positive at lower N:P supply ratios, but negative at higher N:P supply ratios for both Rhodomonas sp. and I. galbana, while for P. tricornutum this effect was negative at all N:P supply ratios. A significant interactive effect of N:P supply ratios and growth rates on N:P biomass ratios was found in both Rhodomonas sp. and P. tricornutum, but not in I. galbana. Our results suggest that Ågren’s functions may explain the underlying biochemical principle for the Droop model. The parameters in the Droop and Ågren’s functions can be useful indications of algal succession in the phytoplankton community in changing oceans.
|Keywords:||Food Webs; Ecology; algae; cell quota; elemental composition; excess uptake; growth rate; N:P ratio; nutrient limitation; semicontinuous culture|
|Research affiliation:||OceanRep > GEOMAR > FB3 Marine Ecology > FB3-EOE-N Experimental Ecology - Food Webs|
|Date Deposited:||11 May 2012 12:40|
|Last Modified:||29 Nov 2012 11:24|
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