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Patterns in microphytobenthic primary productivity: Species-specific variation in migratory rhythms and photosynthesis efficiency in mixed-species biofilms

Underwood, G. J. C., Perkins, Rupert Gordon, Consalvey, Mireille C., Hanlon, A. R. M., Oxborough, K., Baker, N. R. and Paterson, D. M. 2005. Patterns in microphytobenthic primary productivity: Species-specific variation in migratory rhythms and photosynthesis efficiency in mixed-species biofilms. Limnology and Oceanography 50 (3) , pp. 755-767. 10.4319/lo.2005.50.3.0755

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Abstract

The importance of temporal changes in the vertical distribution of microphytobenthic algae on the overall functioning of intertidal biofilms were investigated with low-temperature scanning electron microscopy and high-resolution single-cell fluorescence imaging of photosystem II efficiency (estimated by the fluorescence parameter F'q/F'm) in intact cores maintained in tidal mesocosms. Early morning biofilms consisted of smaller naviculoid and nitzschioid taxa or euglenoid species. By midday, Gyrosigma balticum and Pleurosigma angulatum were dominant. Some taxa (e.g., Plagiotropis vitrea) disappeared from surface layers after midday. Species composition continued to change toward the end of the photoperiod, with G. balticum dominating in diatom-rich biofilms. In Euglena-rich biofilms, initial dense surface films of euglenids became progressively dominated by smaller diatoms. F'q/F'm (measured at a photosynthetically active photon flux density (PPFD) of 220

Item Type: Article
Date Type: Publication
Status: Published
Schools: Earth and Ocean Sciences
ISSN: 0024-3590
Last Modified: 04 Jun 2017 01:39
URI: http://orca.cf.ac.uk/id/eprint/1294

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