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Rainforests of the Metung and Nungurner
areas
Submission prepared by:
Bill Peel on behalf of the East Gippsland Rainforest Conservation
Management Network.
SUMMARY
Metung and Nungurner retains some of the most significant stands of
rainforest left in Victoria that have both state and national
significance, including:
-
A
major portion of a nationally significant aggregation of Littoral
Rainforest stands’ habitat (the largest in south eastern Australia) that
used to once stretch along the northern shore of the Gippsland Lakes
from the mouth of the Mitchell River into the North Arm. This includes
three threatened floristic communities of Littoral Rainforest:
-
East Gippsland Deltaic
Littoral Rainforest;
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Bung Yarnda
Littoral Rainforest; and
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Two Flora and Fauna Guarantee Act (1988)-listed floristic communities of
Warm Temperate Rainforest:
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Alluvial Terraces
Warm Temperate Rainforest; and
-
East Gippsland Coastal
Warm Temperate Rainforest.
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Two nationally threatened and Environmental Protection and Biodiversity
Conservation Act (1999)-listed species;
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Swift Parrot and Grey-headed Flying Fox
All
of the rainforests of the Metung and Nungurner UDF study area are
threatened, many provide habitat for both Environmental Protection and
Biodiversity Conservation Act (1999)-listed animals. Much of this
rainforest estate has been cleared and all of the rainforest vegetation is
either listed as threatened under State’s Flora and Fauna Guarantee Act
(1988) (the Warm Temperate Rainforest floristic communities) or is in the
final stages of the nomination process (the Littoral Rainforest floristic
communities) under the Federal Environmental Protection and Biodiversity
and Conservation Act (1999).
The
Council (and by extension the community that it represents) has
obligations under these acts of Parliament to conserve these threatened
rainforest communities as well as their threatened plants and animals.
Conservation and maintenance of these values requires rainforest
conservation both through the preservation of existing stands and the
rehabilitation and restoration of a significant proportion of the degraded
or previously cleared rainforest habitat in the UDF study area. If as a
community we choose to conserve and restore these rainforest habitats then
we have taken the biggest step towards conserving the cargo of rare and
threatened species they contain.
Fortunately there are significant synergies available across the UDF
study area between sensible planning overlays that deal with land not
suitable for development, erosion risk and storm water management and
nutrient processing whilst maintaining or restoring rainforests in Metung
and Nungurner area.
These synergies fall into the following groupings:
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Gully systems with land too steep for development
and the conservation and restoration of two Flora and Fauna Guarantee
listed floristic communities of Warm Temperate Rainforest;
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Marginal bluffs and steep valley sides
(Natural Systems Analysis Plan 1) between Mairburn Road and Tambo Bluff
and the gully systems associated with Chinamans Creek, Archibald Drive,
Box’s Creek and Nungurner Hills gully systems. Some of these areas if
reserved for erosion protection, could also be used to ensure the
conservation of threatened of newly described Littoral Rainforests
(currently in the nomination process under the Environmental Protection
and Biodiversity Conservation Act 1999);
-
Storm water and nutrient processing along gully systems
through the conservation and restoration of listed Warm Temperate
Rainforest communities that have been locally proven to strip 70% of
floodwater phosphorous and 88% of ground water phosphorous (Peel in
prep. a).
Conservation
status of rainforest in the Metung and Nungurner Urban Area
The
UDF unfortunately fails to list the following: the floristic communities
(Table 1), their conservation status and the threats to them (Table 2) and
their threatened species [Table 3 (plants) and Table 4 (animals)] and
their depletion by locality (Table 5).
There are two ecological vegetation classes of rainforest present in the
study area (Warm Temperate Rainforest and Littoral Rainforest) with five
distinct floristic communities represented (Table 1.).
Rainforest values to the environment and the community at large
In
Victoria rainforests conserve 4% of the states plant diversity (30% of
which are rare and threatened species), despite occupying less than 0.14%
of the State’s land area.
-
Rainforests are excellent water processors and have been proven locally
to strip up to 70% of the phosphorous from surface storm water and 88%
from ground water. This works best in streams of up to third order
(which matches all of the stream orders of the gully systems in the UDF
study area);
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Rainforests are fire retardant and so their presence in the urban
environment is a benefit in this regard;
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Rainforests consist of species that are restricted in the landscape that
can only be conserved by protecting rainforests and their fringing
ecotones;
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Rainforest on or adjacent to properties is a major selling point for
real estate; and
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Rainforests enable urban kids to experience the bush with relative
safety near to home.
Constraints imposed by the conservation status of rainforest
All
of the Warm Temperate Rainforest and Littoral Rainforest communities of
East Gippsland are protected by the NVP regulations. All of the Warm
Temperate Rainforest and Littoral Rainforest floristic communities within
the Metung and Nungurner urban area are threatened.
None of the rainforests in the UDF area will survive without concerted
local government and community actions that include zoning to protect
existing rainforest remnants and their ecotones and zoning to conserve
currently cleared habitat to ensure planning and subsequent development
allow recovery of the rainforests in their past habitat.
Significant
stands of native vegetation (both Littoral and Warm Temperate Rainforests)
have not been recorded from various plans in the UDF document.
These strands occur on the northern shore of Lake King (Tambo Bay) between
Mairburn Road and Tambo Bluff (Littoral Rainforests) and the Warm
Temperate Rainforests of the gully systems associated with Chinamans
Creek.
The
lack of reference to rainforest has meant that its significance has been
overlooked.
Benefits
of conserving existing stands of rainforest and the currently cleared
habitat of rainforest
The
following benefits will accrue if the council adopts planning measures to
conserve these areas of the landscape:
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High tunnel and gully erosion-risk areas will be protected and erosion
risks to infrastructure and housing will be reduced;
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Obligations under the Federal Environmental Protection and Biodiversity
Conservation Act (1999) and State Flora and Fauna Guarantee Act (1999)
will be met;
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Nationally and State-listed rainforest vegetation as well as their cargo
of rare and threatened plants and animals will be conserved;
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Storm water treatment is facilitated by the restoration of rainforests
to gully systems in the Metung and Nungurner UDF study area;
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Nutrient stripping (particularly phosphorous) will remove up to 70% of
phosphorous and if combined with the reinstatement of wetlands at the
mouths of rainforest gullies nitrogen sequestration is enhanced as well;
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Urban and landscape amenity is improved and the environment is
conserved.
Table 1.
Rainforests of the Metung and Nungurner Urban Area.
|
Ecological vegetation class
Habitat features |
Floristic community |
Habitat
Localities in the urban area |
|
Warm Temperate Rainforest
Habitat features:
·
Moist localities;
·
Fire protected |
East Gippsland Alluvial Terraces
Warm Temperate Rainforest |
Habitat:
alluvial soils on creek flats and gully floors of all of the major
gully systems
Localities:
gullies of Chinamans Creek |
|
East Coastal
Warm Temperate Rainforest |
Habitat:
gully sides on limestone or outwash alluviums
Localities:
Gullies of Chinamans Creek |
|
Littoral Rainforest
Habitat features:
·
Exposed sites
·
Saline influence (wind, water, water tables or geology);
·
Fire protected |
East Gippsland Deltaic
Littoral Rainforest |
Habitat:
Deltaic deposits around estuaries
Localities:
the flat foreshore areas from Archibald Drive westward towards Kings
Cove |
|
Limestone
Littoral Rainforest |
Habitat:
steep slopes of limestone with north or west aspects.
Localities:
on western aspect steep valley sides of Chinamans Creek |
|
Bung Yarnda Littoral Rainforest |
Habitat:
The marginal bluffs and subtending sand flats around Lake Tyers.
Localities:
the marginal bluff escarpment from Mairburn Road to Tambo Bluff and on
the eastern shore of the village from Essington Close intersection
with Metung Road northwards to Rosherville Road. |
Table 2.
Conservation status of rainforests that occur in the Metung and Nungurner
UDF study area and the threats to them.
|
Floristic community |
Conservation status |
Threats |
|
East Gippsland Alluvial Terraces
Warm Temperate Rainforest |
Threatened
Flora and Fauna Guarantee-listed |
Habitat loss (land clearing)
Grazing by domestic stock
Feral Deer
Weed invasions
Urban development (subdivision of cleared habitat, weed invasion)
Global warming (increased fire frequency and intensity, rising sea
levels) |
|
East Gippsland Coastal
Warm Temperate Rainforest |
Threatened
Flora and Fauna Guarantee-listed |
Habitat loss (land clearing)
Grazing by domestic stock
Feral Deer
Weed invasions
Urban development (subdivision of cleared habitat, weed invasion)
Global warming (increased fire frequency and intensity, rising sea
levels) |
|
Bung Yarnda
Littoral Rainforest |
Threatened:
currently under consideration in the nomination process under the
Federal Environmental Protection and Biodiversity Conservation Act
(1999). |
Habitat loss (land clearing)
Grazing by domestic stock
Feral Deer
Weed invasions
Urban development (weed invasion)
Coastal recreation and associated infrastructure
Global warming (increased fire frequency and intensity) |
|
Limestone
Littoral Rainforest |
Threatened:
currently under consideration in the nomination process under the
Federal Environmental Protection and Biodiversity Conservation Act
(1999). |
Habitat loss (land clearing)
Grazing by domestic stock
Feral Deer
Weed invasions
Urban development (weed invasion)
Coastal recreation and associated infrastructure
Global warming (increased fire frequency and intensity) |
Table
3.
Rare or threatened plants that occur in the rainforests of the Metung and
Nungurner UDF study area.
|
Name |
IUCN |
EPBC |
AROTS |
VROTS |
FFG |
Action
Statement |
Rainforest type |
|
Yellowwood Acronychia oblongifolia |
e |
|
|
r |
|
|
East
Gippsland Deltaic
LRf; Bung Yarnda LRf; East
East
Gippsland
Coastal
WTRf; Alluvial Terraces WTRf |
|
Coast Grey Box Eucalyptus bosistoana |
|
|
|
r |
|
|
Limestone
LRf |
|
Viscid Daisy-bush Olearia viscosa |
|
|
|
v |
|
|
Limestone
LRf |
|
Spicy Everlasting Ozothamnus argophyllus |
|
|
|
r |
|
|
East
Gippsland Deltaic
LRf; Bung Yarnda LRf; Limestone LRf |
Table
4.
Rare or threatened animals*, which occur (have been recorded) in the
rainforests of the Metung and Nungurner Urban Design Framework study area.
|
Name |
Division Name |
ESP |
AROTS |
VROTS |
FFG |
TR |
CAMBA/ JAMBA |
Notes |
|
Azure Kingfisher
Alcedo azurea |
Birds |
|
|
n |
|
|
|
Nests in
LRf/WTRf |
|
Grey-headed Flying-fox
Pteropus poliocephalus |
Mammals |
VU |
V |
v |
L |
|
|
Food:
LRF/WTRf, roosts: WTRf |
|
Powerful Owl
Ninox strenua |
Birds |
|
|
v |
L |
|
|
Hunts
and roosts: WTRf |
|
Swift Parrot Lathamus discolor |
Birds |
EN |
E |
e |
L |
|
|
Feeds:
LRf/WTRf |
|
White-bellied Sea-Eagle
Haliaeetus leucogaster |
Birds |
|
|
v |
L |
1 |
1/- |
Nests:
WTRf |
*Bold
are rainforest dependant in the district; underlined are those that
breed in rainforests of the district.
Depletion through land clearing, coastal recreation, urbanisation, grazing
and weed invasion
One
of the major reasons for the Network submission relates to habitat loss
for rainforests in the Metung and Nungurner UDF study area. This habitat
loss and the ongoing threats that continue to degrade and erode the
remaining areas of rainforest in the district are directly related to
urban development, coastal recreation and ongoing grazing and weed
invasion. Drawing the Council’s attention to this on a site by site basis
should enable the planning scheme to be amended to accommodate both the
urban development and conservation needs of rainforests in the UDF study
area.
Depletion by locality
The
causes of depletion of rainforests in the Metung and Nungurner UDF study
area, the planning solutions and benefits are listed in Table 5.
Tunnel
erosion
This
is a very real and serious threat to existing urban areas in Metung and
Nungurner and the mistakes of the past (allowing development on high risk
areas) should not be repeated in the future urban developments.
Tunnel erosion occurs where sodic clay soils dissolve and are transported
down slope. Over time huge cavities are created and the overlying soils
collapse creating gully erosion. This represents a serious threat to
infrastructure including roads and housing.
The
occurrence of tunnel erosion shows a strong correlation between land
clearing, sodic soils and steep topography. The areas of greatest risk
roughly align with the steep areas shown in the Natural Systems Analysis
Plan 1.
Suggested
solution:
through the UDF the council should prevent the subdivision of steep areas
and these should be reserved to:
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Maintain geological stability;
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Ensure erosion protection;
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Maintain urban amenity;
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Enhance landscape values; and
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Provide for the conservation of rainforest vegetation and its cargo of
rare or threatened plants and animals.
This
action would conserve much of the existing rainforest as well as
preserving much of its former habitat that has been cleared in the past so
that it may be restored in the future.
Benefits
of this course of action:
·
Housing and infrastructure is not put at risk by tunnel erosion;
·
The
rate of tunnel erosion is slowed; and
·
Remedial measures to deal with tunnel erosion (if required) will have a
minimal impact on the built environment.
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