Are marine diatoms favoured by high Si:N ratios?.

Sommer, Ulrich (1994) Are marine diatoms favoured by high Si:N ratios?. Open Access Marine Ecology Progress Series, 115 . pp. 309-315.

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Competition experiments were performed first with 4, then with 11 species of marine phytoplankton at various ratios of si1icate:nitrate and various light intensities. Diatoms became dominant at Si:N ratios >25:1 while flagellates were the superior competitors at lower ratios. The light supply did not influence the competitive position of diatoms and non-siliceous flagellates in general, while it was important in determining the outcome of competition at the species level. In the 11 species expenments, Stephanopyxis palmenana was the dominant diatom at high light intensities. It shared dominance with Lauderia annulata at medium and low light intensities and high Si.N ratios. Pseudonitzschia pungens was the dominant diatom at low light intensities and relatively low Si:N ratios. The green alga Dunaliella tertiolecta was the dominant flagellate at high light intensities, while at low light intensities the prymnesiophycean Chrysochromulina polylepis and the cryptophyte Rhodomonas sp. were also important.

Document Type: Article
Keywords: Food Webs; marine diatoms; Phytoplankton; competition; nutrients
Research affiliation: OceanRep > GEOMAR > FB3 Marine Ecology > FB3-EOE-N Experimental Ecology - Food Webs
Refereed: Yes
Open Access Journal?: No
ISSN: 0171-8630
Date Deposited: 27 Mar 2012 08:47
Last Modified: 07 May 2018 13:33

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