Effects of different phosphorus concentrations and

Authors: Junlei Li Xiaoxia Sun

Publish Date: 2016/03/17

Volume: 34, Issue: 6, Pages: 1158-1172

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Abstract

The effects of different phosphorus P concentrations 036 36 and 36 μmol/L corresponding to low middle and highP concentration groups respectively and nitrogen N/P ratios on the growth and photosynthetic characteristics of Skeletonema costatum and Prorocentrum donghaiense were studied For both species the highP HP concentration group showed the greatest algal density and highest specific growth rate Changes in the maximum efficiency of photosystem II F v /F m were monitored under the various P and N/P conditions The largest decrease in F v /F m was in the lowP LP group in S costatum and in the HP group in P donghaiense There were high rapid light curves and photochemical quantum yields Φ PSII for S costatum in the HP group while the actual photosynthetic capacity was higher in P donghaiense than in S costatum in the MP group Under eutrophic but relatively Prestricted conditions P donghaiense had higher photosynthetic activity and potential which could cause this dinoflagellate to increasingly dominate the phytoplankton community in these conditions Under the same P concentration and N/P ratio P donghaiense had a larger relative maximum rate of electron transport and higher Φ PS II values than those of S costatum These differences between P donghaiense and S costatum may explain the interaction and succession patterns of these two species in the Changjiang Yangtze River estuary from a photosynthesis perspectiveSupported by the “Strategic Priority Research Program—Climate Change Carbon Budget and Relevant Issues” of Chinese Academy of Sciences No XDA05030401 the National Basic Research Program of China 973 Program No 2014CB441504 the Key Program of National Natural Science Foundation of China No 41230963 and the NSFCShandong Province Joint Fund Project No U1406403

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