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Journal of Plankton Research Vol.24 no.7 pp.687-702, 2002
© Oxford University Press 2002

Effect of Mesodinium rubrum (= Myrionecta rubra) on the action and absorption spectra of phytoplankton in a coastal marine inlet

Margareth Kyewalyanga,*, Shubha Sathyendranath1,2 and Trevor Platt2

Institute Of Marine Sciences, University Of Dar Es Salaam, Po Box 668, Zanzibar, Tanzania, 1 Department Of Oceanography, Dalhousie University, Halifax, Nova Scotia B3h 4j1 And 2 Biological Oceanography Division, Bedford Institute Of Oceanography, Box 1006, Dartmouth, Nova Scotia B2y 4a2, Canada

* Corresponding Author: Email: maggie{at}zims.volsm.ac.tz

This study, carried out at a single station in the Bedford Basin (Nova Scotia, Canada), examined time-dependent changes in the physical and chemical conditions of the waters with associated changes in species composition and some photosynthesis properties of phytoplankton. The sampling period covered late summer months (August and September) and fall months (October to December). Changes in the water conditions were found to influence species composition, which in turn had an effect on the shapes and amplitudes of the action and absorption spectra of phytoplankton, and on the maximum quantum yield of photosynthesis. The most remarkable change was observed in October during a bloom of Mesodinium rubrum, a ciliate harbouring photosynthetic endosymbionts rich in phycobilins. The presence of M. rubrum yielded atypical shapes of the measured photosynthetic action spectra; furthermore, other photosynthesis properties changed significantly. These results demonstrate that the presence of certain pigments in the water column may be associated with a marked shift from what may be considered typical (representative) photosynthesis properties of phytoplankton.


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