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Studies on the zooplankton and hydrology of South-Eastern coastal waters of Tasmania.

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Taw, N (1975) Studies on the zooplankton and hydrology of South-Eastern coastal waters of Tasmania. PhD thesis, University of Tasmania.

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Abstract

The zooplankton and hydrology of the south-eastern
coastal waters of Tasmania - Coastal waters off the East Coast,
Inshore coastal waters and the Derwent River Estuary are
investigated.
THE ZOOPLANKTON : SYSTEMATICS
Zooplankton species found during the studies are recorded,
illustrated, and discussed taxonomically where appropriate. A
brief account is given of the distribution of the 71 Pelagic
Copepods, 8 Euphausids, 1 Sergestid, 11 Chaetognaths and 7 Pelagic
Tunicates. Except for 2 Copepod species which are assigned to a
genus, the remainder are positively identified. Amongst the species
recorded, 22 Copepods are new to Australian waters whereas 38
Copepods, 1 Euphausid and 2 Chaetognaths are new records for
Tasmania. Keys to the genera and species are also given.
THE DISTRIBUTION OF ZOOPLANKTON OFF THE EAST COAST AND THEIR
VALUE AS BIOLOGICAL INDICATORS
Ten Cruises when twelve Stations were usually operated
during each Cruise, totalling 89 Stations from August 1971 to
May 1973 were made for surface samples off the East Coast.
Thirty-five species, mainly based on their preferences
for depth or temperature/salinity are selected and analysed from
grouping of species and Stations by the computer program DIVINFRE .
Six types of water masses involving three water masses
characterized by five species-groups such as, (i) Coastal;
(ii) mixed Coastal and Sub-tropical; (iii) mixed Coastal and
Sub-antarctic; (iv) mixed Sub-tropical and Sub-antarctic;
(v) Sub-tropica 1; and, (vi) Sub-antarc tic, are found off eastern
Tasmania.
iv
Some literature contradictions relating to the position
of the Sub-tropical Convergence and salinity of Sub-antarctic
waters are discussed and it was found that the convergences
oscillate along the East Coast with seasons.
ZOOPLANKTON AND HYDROLOGY OF INSHORE COASTAL WATERS.
Three Stations in inshore waters were operated at monthly
intervals for a period of 12 months from August 1971 to July 1972,
collecting samples from surface, 10m and 20m depths during day and
night.
Seasonal diurnal vertical distribution of most of the species
and biomass for the 3 Stations are given and discussed. Seasonal
zooplankton composition for the Station at the mouth of the
Derwent Estuary is given.
Relative composition of indicator zooplankton species groups
(inshore coastal, coastal and oceanic) are used to determine the
influence of estuarine and intrusion of oceanic waters to the
region. The possible oceanic waters involved and effects of
movement of waters on the accumulation of heavy metals in oysters
found in the Derwent Estuary and adjacent waters are mentioned.
Such influences are possibly the main factors affecting
the seasonal cycles of the zooplankton composition and biomass.
ZOOPLANKTON AND HYDROLOGY OF THE DERWENT ESTUARY
Collections from two Cruises, on 1st October 1973 and
23rd April 1974 when 10 Stations extending 50 kilometres upstream
were operated during each Cruise, are studied.
Hydrologically, the region covers from freshwater to marine,
17 zooplankton species representing freshwater, estuarine and marine
environment being found.
The results are compared with those of previous and
similar hydrological and ecological studies.

Item Type: Thesis (PhD)
Additional Information:

Copyright the Author - The University is continuing to endeavour to trace the copyright owner(s) and in the meantime this item has been reproduced here in good faith. We would be pleased to hear from the copyright owner(s).

Date Deposited: 04 Feb 2013 03:13
Last Modified: 11 Mar 2016 05:56
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