KORSMAN CONSERVANCY

Litter

Picnickers and passers-by throw litter onto the verge or over the fence inside the bird sanctuary.
Much litter also washes into the Sanctuary from the catchment via stormwater drains.

Environmental Challenges

Litter in Aloe St stormwater inlet

Sewerage Spills

Two pumping stations pump the sewerage which drains from the entire suburb, to the treatment plant a few kilometres away.
Spills into the pan occur due to pump failures, pipe blockages and cracked pipes.


Sewerage inflow aftermath
Feral and Domestic Animals
Cats enter the Sanctuary to catch birds and frogs.
Escaped exotic water fowl sometimes appear such as domestic geese, or black swans which have naturalised in the Sanctuary.

Alien and Invasive Plants

Invasive vegetation is our biggest environmental threat.
Some troublesome Category 1b plants found in Korsman include:
   -  Black Locust             -  Spear Thistle
   -  Bugweed                  -  Pom Pom Weed        - Purple Top                Jerusalem Cherry         
Control methods used at Korsman

Galleries of categorised invasives and weeds

Spear Thistle
High Water Level
Higher residential density, complexes, paved areas and large homes have increased runoff over the years that the Pan water level is much higher than historically.
This reduces biodiversity by flooding the grassland, eliminating habitat for waders and allowing encroachment of reeds.
An evacuation pump in the Westdene North pump station transports the water via the Benoni Lake golf course into Middle Lake.
Cat with frog
Secondary Poisoning
Owls which eat poisoned rats and vermin are killed in turn by the ingested poison. The best way to prevent vermin is keeping the property clean. All rat poisons are dangerous, with Racumin the least toxic.
Dead owl
Invasive Fauna








Common myna birds eat the eggs of and kill chicks of local birds, especially hole nesters such as barbets.

Photo by Eugene Liebenberg
Mallard ducks are a Category 1b invader as they interbreed with Yellow-billed ducks and teals.

Hybrid Mallard photo by Werner van Goethem
Carp are a Category 2 invader which compete for food sources with indigenous fish and dabbling waterfowl.

Photo by Eugene Liebenberg
Asian Harlequin beetles are a variable species that look like ladybirds. They outcompete indigenous ladybirds, carry parasites and even eat their larvae.

Harlequins are recognised by the black W / white M shape on the pronotum (behind the head.)
Air and Noise Pollution
Air pollution comes from nearby industries and illegal rubbish burning.
Noise pollution is caused by industries, firework displays and loud events.

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Speeding Vehicles
Vehicles on The Drive kill birds, frogs and crabs, and threaten pedestrians and cyclists.

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