Author:
Chan Terence U.,Hamilton David P.
Abstract
Physico-chemical factors affecting phytoplankton succession and dynamics are
examined in the upper Swan River estuary, Western Australia. Freshwater
discharge affects the residence time available for different phytoplankton
taxa to grow. It also influences succession between marine, estuarine and
freshwater phytoplankton taxa according to the extent that it hinders
intrusion of marine water into the estuary. The three major phytoplankton
groups, Bacillariophyta, Dinophyta and Chlorophyta, are strongly separated
temporally by season, and spatially along the estuary according to flow and
salinity. Bacillariophyta exhibit the widest range of maximum potential growth
rates and occur under a wide range of discharges. Dinophyta, dominated by
relatively few brackish water species, have the lowest growth rates, and occur
only at very low discharges. Chlorophyta, dominated by
Chlamydomonas globulosa, are intermediate in their
potential growth rates, and are restricted to freshwater conditions. In the
Swan River estuary, nutrients appear to be less important than flow and
salinity in regulating phytoplankton succession and biomass. It is highly
likely that anthropogenic effects on freshwater discharge to Australian
estuaries have had a significant impact on composition and biomass of
phytoplankton communities. Control of freshwater discharge thus has the
potential to control species assemblages, phytoplankton bloom potential, and
eutrophication.
Subject
Ecology,Aquatic Science,Ecology, Evolution, Behavior and Systematics,Oceanography
Cited by
44 articles.
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