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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
agricultural and biological sciences
Canopy characteristics of the brown alga Sargassum muticum (Fucales, Phaeophyta) in Lake Grevelingen, southwest Netherlands
Hydrobiologia, Volume 204-205, No. 1, Year 1990
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Description
The present distribution of the invasive brown alga Sargassum muticum in the southwest Netherlands is updated. Populations of the alga were found to remain at their 1985 level in Lake Grevelingen, with a small eastward expansion into the Eastern Scheldt estuary. A new population for the brackish, non-tidal Lake Veere is reported. Within Lake Grevelingen S. muticum forms a persistent, extensive canopy of 100% cover (4,442.5 ± 525.6 g fresh wt m-2, 640.3 ± 75.8 g dry wt m-2) that has a marked effect upon the penetration of photosynthetically active radiation (PAR) (reduced by 97% at 0.1 m). Surface sea water temperatures can be elevated by 2.7 °C above water not associated with a Sargassum canopy; furthermore, the dense canopy shades and hence reduces water temperatures below 0.1 m depth. Productivity studies indicate that assimilation occurs in the upper levels of the canopy (57.09 μg C mg dry wt-1 m-2 at a mean PAR rate of 106.7 J cm-2 h-1). Self-shading and a resultant decrease in the rate of assimilation was evident below the canopy. © 1990 Kluwer Academic Publishers.
Authors & Co-Authors
Critchley, Alan T.
South Africa, Johannesburg
University of the Witwatersrand
de Visscher, P. R.M.
Netherlands, Yerseke
Delta Institute for Hydrobiological Research
Nienhuis, Pieter H.
Netherlands, Yerseke
Delta Institute for Hydrobiological Research
Statistics
Citations: 37
Authors: 3
Affiliations: 2
Identifiers
Doi:
10.1007/BF00040236
ISSN:
00188158
e-ISSN:
15735117
Research Areas
Cancer
Environmental
Study Design
Cross Sectional Study