Author:
Jones GJ,Blackburn SI,Parker NS
Abstract
A bloom of Nodularia spumigena Mertens occurred in Orielton Lagoon, Tasmania, a shallow, eutrophic
coastal embayment, between December 1992 and March 1993. The N. spumigena bloom was preceded
by a eustigmatophyte bloom and was followed in March-April 1993 by a bloom of the diatoms
Nitzschia closterium (Ehrenb.) Smith and Chaetoceros socialis Lauder. The Nodularia spumigena
bloom may have been stimulated by low salinity (15-20 g kg-1) in the lagoon during December and
January. Culture experiments with N. spumigena strains isolated from the lagoon showed best growth at
salinities between 0 and 24 g kg-1 and less optimal growth at a salinity of 35 g kg-1. Akinete
production in culture was positively correlated (P < 0.001) with increasing salinity of growth media.
The collapse of the N. spumigena population may have been triggered by decreasing water temperature
in March, although this cannot be conclusively proven with the limited physico-chemical data available.
High-performance liquid chromatographic (HPLC) analyses of bloom samples showed high
concentrations (2000-3500 �g g-1 dry weight) of the cyclic pentapeptide hepatotoxin nodularin in
samples collected during the peak of the N. spumigena bloom in January and February. Nodularin
content of the bloom decreased as the population declined, owing to the decrease in abundance of
N. spumigena and the release of nodularin by dying cells. A culture of N. spumigena isolated from
Orielton Lagoon produced nodularin at concentrations comparable to those observed in field samples.
A second HPLC peak, eluting very close to nodularin and with a similar ultraviolet spectrum, was
observed in some field samples. This compound may be the ADDA-C8 stereoisomer of nodularin.
Subject
Ecology,Aquatic Science,Ecology, Evolution, Behavior and Systematics,Oceanography
Cited by
41 articles.
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