Effect of salinity on growth, pigmentation, N2 fixation and alkaline phosphatase activity of cultured Trichodesmium sp

Fu, F. X. and Bell, P. R. F. (2003) Effect of salinity on growth, pigmentation, N2 fixation and alkaline phosphatase activity of cultured Trichodesmium sp. Marine Ecology-progress Series, 257 69-76. doi:10.3354/meps257069


Author Fu, F. X.
Bell, P. R. F.
Title Effect of salinity on growth, pigmentation, N2 fixation and alkaline phosphatase activity of cultured Trichodesmium sp
Journal name Marine Ecology-progress Series   Check publisher's open access policy
ISSN 0171-8630
1616-1599
Publication date 2003-01-01
Sub-type Article (original research)
DOI 10.3354/meps257069
Open Access Status DOI
Volume 257
Start page 69
End page 76
Total pages 8
Place of publication Oldendorf, Germany
Publisher Inter-Research
Language eng
Abstract Trichodesmium sp. isolated from the Great Barrier Reef lagoon was cultured in artificial seawater media containing a range of salinities. Trichodesmium sp. actively grew over a wide range of salinities (22 to 43 psu) and hence can be classed as euryhaline. Maximum growth occurred with salinities in the range 33 to 37 psu. Chl a content and alkaline phosphatase activity were found to increase with salinity over the range 22 to 43 psu, but the N-2 fixation rate was reduced at salinities below and above the range for maximum growth. Growth in media exhibiting maximum growth was characterised by well-dispersed cultures of filaments, while significant aggregations of filaments formed in other media. It is proposed that the tendency for Trichodesmium filaments to aggregate in media with salinities outside the range for maximum growth is an opportunistic response to a deficiency of cellular nitrogen, which results from the reduced N-2 fixation rates, and the aggregation occurs in order to enhance the uptake of combined N released within the aggregates and/or the N-2 fixation within the aggregates.
Keyword Ecology
Marine & Freshwater Biology
Oceanography
Trichodesmium Sp.
Salinity
N-2 Fixation
Alkaline Phosphatase Activity
Barrier-reef Lagoon
Blue-green-alga
Nitrogen-fixation
Osmotic-stress
Porphyra-umbilicalis
Marine
Cyanobacteria
Phytoplankton
Oscillatoria
Populations
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemical Engineering Publications
2004 Higher Education Research Data Collection
 
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Created: Wed, 15 Aug 2007, 12:17:36 EST