Twenty four plant communities were recorded in the Aviva survey area, comprising five heath
communities, eight Proteaceae and Myrtaceae-dominated communities, eight Eucalypt communities
and two chenopod communities (Figures 1 and 2. Some communities such as T1 and T4 had higher
species richness than other communities (Appendix E). This is due to a higher number of sampling
points occurring in these communities due to their spatial extents (Table 4).
All of the defined communities are represented in either the Tathra or Eridoon vegetation systems
direct impact of the projects and formal conservation reserves shows that the impact on the Eridoon
vegetation system will be greater than the Tathra system (Table 5). This is expected as the extent of the
Tathra vegetation system is greater (Table 5). Although Pre – European extents may not give an
accurate indication of the complete impact of the Projects, it will accurately describe what percentage is
currently in Conservation Estate and provides a conservative estimate of the impact of the proposals.
Apart from the greater impact on the Eridoon systems, the amount that is in Conservation Estate is
much greater than what will be affected. However, these figures should be compared with already
approved projects to assess the impact at a regional level.
The community type T1 is considered to be regionally significant as it contains two rare taxa,
and T2 are considered to be locally significant as they contain Priority Flora (Environmental Protection
Authority 2004), while communities E5 and S1 are locally significant as the proposals clear a
significant amount of their known local area. The level of community reservation can be inferred from
the regional vegetation system data.
The H1 heath community included pockets of lateritic rises, and therefore has some species in common
Community - Rocky Springs type. Community 72 Ferricrete Floristic Community is listed as
Vulnerable by the Department of Environment and Conservation (2006). This Threatened Ecological
Community is not currently listed under the Commonwealth EPBC Act (1999). On the basis of database
search and a comparison with regional datasets (Department of Environment and Conservation 2009a),
the majority of the flora recorded on the Rocky Springs Ferricrete communities are represented either
on the northern Swan Coastal Plain or in the adjacent regions. Twenty-nine of the sixty taxa recorded
within the local TEC Ferricrete Community (Hamilton-Brown et al. 2004) were recorded within the
survey area. The majority of these species occur more widely, and therefore the significance of the
latter is difficult to assess in view of the lack of regional studies on the Rocky Springs TEC. The project
as proposed does not impact directly on the Rocky Springs TEC.
As indicated earlier in this report there appears to be debate over the extent and definition of the Rocky
of the relationships between ferricrete layers and floristic data. The local findings indicate that the
exposed ferricrete is not at the location as specified through the Department of Environment and
Conservation (2006) database and that the ferricrete layer extends under large sections of the systems
within the coastal plains. Therefore the whole question about the significance of the TEC remains open
to debate until the TEC is better defined in composition and spatial extent. Meanwhile the data as
collated on the flora and plant/soil relationships indicate that there are no species within the TEC that
are restricted to the TEC and therefore the risk of any indirect impacts remains low. This low risk is
further substantiated by the dominance of flora species in the range of communities within the Aviva
project area that are reliant on rainfall rather than groundwater.
Groundwater Dependent Communities
In reviewing the lifeforms of the other plants within the communities on the Aviva project area, it is
majority of the plant species are herbs or small shrubs that will have shorter root systems. This
relationship can then be expanded to their dominance within the respective plant communities. The
heath and scrub (H2 and T1) communities that dominate the communities on the project area are largely
dominated by shallow rooted species or shrubs that are primarily reliant on the soil moisture levels
being maintained from rainfall events. These heath and scrub communities also dominate the south-
eastern corner of the Lake Indoon Nature Reserve which may be impacted through the temporary
lowering of groundwater levels. The Eucalyptus camaldulensis var. obtusa woodlands around Lake
Indoon have already been subjected to various periods of drought and despite some stress in the trees
have survived these periods.
A number of issues will require consideration if one or both projects are to go ahead. These include, but
associated with the Coolimba Power Station Project.
Risks posed to community types, particularly T1, at a regional scale
Risks posed to other Priority Flora, particularly Calytrix purpurea (P2), Acacia flabellifolia
uncommon or range extensions.
Effect of indirect impacts such as emissions, weeds, too frequent fires and Phytophthora
The following personnel of Mattiske Consulting Pty Ltd have been involved with this project:
Mrs L. Cobb
Mrs. B. Koch
Mr D. Rathbone
Ms B. Taylor
Mr A. Ruschmann
Mr. D. Marsh
Mr. M. Boardman
Ms S. Robinson
Ms F. de Wit
Ms. M. Van Wees
Mr. R. Burrows
Mr. A. Robinson
Ms S. Thomson
Ms F. Smith
Mr S. Reiffer
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Beard, J.S. (1990)
Blackall, William E. Grieve, Brian J. (1982).
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Como, Western Australia
Butcher R. (2007)
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accessed on : 24 th January
Crisp, M.D. (1982)
Daviesia spiralis and D. debilior (Leguminosae: Papilionoideae), two new species occurring in
the Wongan Hills, Western Australia. Nuytsia. 9: 9-16.
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Department of Environment and Conservation (2006)
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for the Environment
Department of Environment and Conservation (2009b)
Department of Environment and Conservation (2009)
and Conservation, August 2008.
Department of the Environment, Water, Heritage and the Arts (2004)
Department of the Environment, Water, Heritage and the Arts (2008)
on 18 February 2009 at 15:26 WDST
Department of the Environment, Water, Heritage and the Arts (2009a)
Department of the Environment, Water, Heritage and the Arts (2009b)
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Environmental Protection Authority (2004)
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Land Management, Como, Western Australia
Keighery, B.J. (1994)
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Aviva Pty Ltd.
Murray B.R., Zeppel M.J.B, Hose G.C., and Eamus, D. (2003)
Ecological Management & Restoration. 4 ( 2), Pages 110 - 113
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Patrick, S. and Brown, A. (2001)
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Wildlife Conservation Act (1950-1980) [WA]
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prepared for Iluka Resources Ltd – Iluka 00-16
Declared Rare Flora – Extant Taxa
“Taxa which have been adequately searched for and are deemed
in need of special protection and have been gazetted as such.”
Priority One – Poorly Known Taxa
“Taxa which are known from one or a few (generally <5)
size, or being on lands under immediate threat. Such taxa are
under consideration for declaration as ‘rare flora’, but are in
urgent need of further survey.”
Priority Two – Poorly Known Taxa
immediate threat (i.e. not currently endangered). Such taxa are
under consideration for declaration as ‘rare flora’, but urgently
need further survey.”
Priority Three – Poorly Known Taxa
“Taxa which are known from several populations, and the taxa
endangered), either due to the number of known populations
(generally >5), or known populations being large, and either
widespread or protected. Such taxa are under consideration for
declaration as ‘rare flora’ but need further survey.”
Priority Four – Rare Taxa
“Taxa which are considered to have been adequately surveyed
threatened by any identifiable factors. These taxa require
monitoring every 5-10 years.”
Taxa which at a particular time if, at that time, there is no
Extinct in the Wild
Taxa which is known only to survive in cultivation, in captivity
not been recorded in its known and/or expected habitat, at
appropriate seasons, anywhere in its past range, despite
exhaustive surveys over a time frame appropriate to its life cycle
Taxa which at a particular time if, at that time, it is facing an
future, as determined in accordance with the prescribed criteria.
Taxa which is not critically endangered and it is facing a very
as determined in accordance with the prescribed criteria.
Taxa which is not critically endangered or endangered and is
Taxa which at a particular time if, at that time, the species is the
would result in the species becoming vulnerable, endangered or
critically endangered within a period of 5 years.
Presumed Totally Destroyed
An ecological community will be listed as Presumed Totally Destroyed
if there are no recent records of the community being extant and either of
the following applies:
records within the last 50 years have not been confirmed
despite thorough searches or known likely habitats or;
all occurrences recorded within the last 50 years have since