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Seasonal changes in hydrology and the distribution of plankton in the Bathurst Harbour estuary, southwestern Tasmania, 1988-89

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Edgar, GJ and Cresswell, GR (1991) Seasonal changes in hydrology and the distribution of plankton in the Bathurst Harbour estuary, southwestern Tasmania, 1988-89. Papers and Proceedings of the Royal Society of Tasmania, 125. pp. 61-72. ISSN 0080-4703

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Abstract

The hydrology and abundance of planktonic organisms (>20 m size) were surveyed at various sites in the Bathurst Harbour/Port Davey
estuary on five occasions between October 1988 and July 1989, and the hydrology again surveyed in February 1991. In winter, the period
of peak freshwater outflow, a brackish surface layer (~15%0) was present to a depth of ~4 m throughout the estuary. This surface layer was
present to a reduced depth in other seasons, except during summer, when the halocline broke down and surface salinities of ~29%0 in 1989
and ""25%0 in 1991 prevailed. Bottom waters were close to fully marine (~33%0) throughout the year. Surface waters in Bathurst Harbour
were found to be extremely depleted in nitrates «0.1 11M). Oxygen levels were also very low (~35% saturation) during the 1989 summer,
which was unusually dry, but were near full saturation during the other sampling periods.
The plankton community in Bathurst Harbour contained very few taxa, particularly during the winter months. The dinoflagellate
Dinophysis acuminata comprised >99% of total phytoplankton numbers in October 1988 and July 1989, while the copepods Gladioferens
inermis and Oithona australis and the appendicularian Oikopleura sp. numerically dominated the woplankton community. Dinoflagellates
and copepods both occurred in high densities. The distribution of diatoms within the estuary was inversely related to the distribution of
dinoflagellates; diatoms occurred in low densities relative to dinoflagellates in Bathurst Harbour outside the summer months, but occurred
in much higher densities than dinoflagellates in the waters of Port Davey throughout the year.

Item Type: Article
Keywords: Royal Society of Tasmania, RST, Van Diemens Land, natural history, science, ecology, taxonomy, botany, zoology, geology, geography, papers & proceedings, Australia, UTAS Library
Journal or Publication Title: Papers and Proceedings of the Royal Society of Tasmania
Page Range: pp. 61-72
ISSN: 0080-4703
Collections: Royal Society Collection > Papers & Proceedings of the Royal Society of Tasmania
Additional Information:

Copyright Royal Society of Tasmania

Date Deposited: 23 May 2012 03:34
Last Modified: 18 Nov 2014 04:34
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