Mabi forest

Curtain Fig, within North Queensland's largest remnant Mabi forest (4 km2)[1]

Mabi forests (also known as Complex Notophyll Vine Forests 5b[2]) are a type of critically endangered, indigenous Australian ecological community, remnant patches of which can only be found on some of the fertile (nutrient rich) basalt soils of either North Queensland's Atherton Tablelands, or at Shiptons Flat (aka Kuna[3]), along the Annan River[4]

A Threatened Species Scientific Committee charged with advising on the conservation status of native species and ecological communities recommended the remnant Mabi forests be listed as "critically endangered" for the following reasons:[2]

"There is only 1050 ha of Mabi Forest left, and this occurs as a series of small, isolated patches. Many of the remnant patches of Mabi Forest are being invaded by exotic smothering vines, and feral and domestic animals. The use of remnant patches of Mabi Forest by stock can impact on this ecological community through trampling, grazing and soil compaction."

Lumholtz tree kangaroo (aka Mabi), large numbers of which are supported by Mabi forests, after which Mabi forests have been named

The name "Mabi" is a locally indigenous Dyirbal and Yidiny language name for the Lumholtz tree kangaroo[1] The name "Mabi forest" was given to this particular type of ecological community, as it is a forest type and habitat that supports high populations of Lumholtz tree kangaroos (aka Mabi)[1]

Distribution

Mabi forests are confined to the Atherton Tableland (with the exception of small remnant patch at Shiptons Flat).

Botanist Tony Irvine writing for Trees for the Evelyn and Atherton Tablelands Inc in 2004, described their distribution, then, as follows:

"..today remnants consist of Curtain Fig including Thomas Road, Picnic Crossing, Kairi Research Station, Cullamungie Pocket (slightly south of Pelican Point but on the eastern side of Tinaroo Dam), Halloran's Hill, Nasser's Property (Wongabel), Wongabel State Forest, Nicholas Creek, Tolga Scrub and other small scattered areas of less than 0.5 ha on private property. Curtain Fig is the largest remnant, roughly consisting of slightly less than 4 square kilometres in area."

Characteristics

Mabi forests are a particular kind of dense vine forest that grows on nutrient rich yet porous volcanic soils with annual rainfalls averaging between 1300 – 1600 mm[4] and a severe seasonal dry around October of each year[1]

These ecological communities can be distinguished from other forests types by their thick layer of shrubs and many vines growing beneath more open canopies of semi-evergreen and scattered deciduous trees (reaching upwards to between 25m and 45 m high).[2]

Botanist Tony Irvine described Mabi forests as follows:[1]

"..the key thing about Mabi Forest...is that it has mostly tall canopy trees, many vines and a dense shrub layer."

"Key diagnostic features of Mabi forest are:
* Many trees with plank buttresses up to 45m tall
* A well-developed layer of specific shrub species and scrambling lawyer vines.
* A high presence of deciduous and semi-deciduous trees.
* Scattered large lianas and many slender vines
* Large-sized individual epiphytic ferns
* High presence of stinging bushes along edges and in large canopy gaps
* Usually has seasonal wilting of the understorey and seasonal heavy leaf fall."

He further describes the multiple layers of typical Mabi forest as follows:[1]

"The forest may have up to six layers of vegetation. The canopy is uneven and consists of:
1. Scattered emergent trees, 40-45m tall
2. A main canopy, 25-40m tall but occasionally as low as 14-20m...
3. A subcanopy, 12-20m tall
4. A lower layer, 6-8m tall. This layer tends to be absent in areas with lower upper canopies.
5. A predominantly dense shrub and scrambling lawyer vine zone 1-5m tall.
6. A zone of seedling trees, shrubs, vines and herbs 0-1m tall."

External links

References

  1. 1 2 3 4 5 6 Tony Irvine (2004) "More about Mabi Forests" TREAT Newsletter Accessed 17 March 2009
  2. 1 2 3 Department of Environment and Heritage (2004) Mabi Forest Nationally Threatened Species and Ecological Communities Information Sheet Accessed 17 March 2009
  3. ↑ Hershberger, Henry & Hershberger Ruth (1986) "Kuku Yalanji Dictionary Summer Institute of Linguistics. Darwin" Accessed 16 March 2009
  4. 1 2 Federal Register of Legislative Instruments (2007) Inclusion of ecological communities in the list of threatened ecological communities under section 181 of the Environment Protection and Biodiversity Conservation Act 1999 Accessed 17 March 2009
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