An ecological typology of the rivers of New South Wales, Australia
- Publication Type:
- Thesis
- Issue Date:
- 2007
Closed Access
Filename | Description | Size | |||
---|---|---|---|---|---|
01Front.pdf | contents and abstract | 1.75 MB | |||
02Whole.pdf | thesis | 106.51 MB | |||
03Appendix 1.pdf | 140.33 kB | ||||
04Appendix 2.pdf | 128.21 kB | ||||
05Appendix 3.pdf | 188.87 kB |
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NO FULL TEXT AVAILABLE. Access is restricted indefinitely. ----- There is a need for an ecological classification scheme for rivers to facilitate natural
resource management in New South Wales (NSW). One way of doing this is to define
river types based on reference condition and multi-attribute data from river sites.
322 reference sites were selected across NSW, Australia which has a surface area of
801,428 km² and population of approximately 6.8 million. These were selected to
represent all major river types across the State. Environmental data and
macroinvertebrate samples were collected from all of these sites. In addition, wherever
possible, I compiled likely lists of fish species for each sites from a database containing
records of fish collected from rivers across NSW. I used diatom data from relatively
undisturbed river sites in eastern NSW. I determined multivariate patterns in the abiotic
and biological data using ordination and classification methods and defined river types
for each of these attributes. Then, using classification trees, I identified major thresholds
in elevation and mean annual rainfall. Using these thresholds, together with boundaries
of major river basins, I defined regions for each typology that contained as few river
types as possible. Then I constructed two classification trees for each region for each
typology. One of these trees only used immutable variables: maximum distance from
source, elevation, slope, latitude and mean annual rainfall. The other classification tree
used all variables measured including water quality data, substratum cover and modal
river width.
In all I defined 10 abiotic, 8 macroinvertebrate edge, 5 macroinvertebrate riffle, 6 fish
and 3 diatom river types. I wrote identification keys for all these except for the diatom
river types using the immutable variables.
One of the primary areas of application of the river typologies is in the prioritisation of
rivers for conservation action. I explored this in the Hunter region by mapping the
macroinvertebrate edge and fish river types, calculating the total length of rivers in each
type and determining how much of this was within protected areas. I used this to
determine criteria for prioritisation of land units within the region. I then divided the
region into smaller subcatchments and ranked these subcatchments using the river type
priority criteria. This prioritisation may be used as a factor in region prioritisation for
conservation action alongside assessments of catchment condition, threats, special
ecological values and recovery potential.
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