Acacia mearnsii


Acacia mearnsii is a leguminous, fast growing,forest tree native to south-eastern Australia and Tasmania, which is considered one of the worst invasive species in the world. Common names for it include black wattle, Acácia-negra, Australian acacia, Australische Akazie, Swartwattel, Uwatela.

Taxonomy

Belgian naturalist Émile Auguste Joseph De Wildeman described the black wattle in 1925. The species is named after American naturalist Edgar Alexander Mearns, who collected the type from a cultivated specimen in East Africa. Along with other bipinnate wattles, it is classified in the section Botrycephalae within the subgenus Phyllodineae in the genus Acacia. An analysis of genomic and chloroplast DNA along with morphological characters found that the section is polyphyletic, though the close relationships of many species were unable to be resolved. Acacia mearnsii appears to be most closely related to A. dealbata, A. nanodealbata and A. baileyana.

Distribution and habitat

A. mearnsii is native to south-eastern Australia and Tasmania, but has been introduced to North America, South America, Asia, Europe, Pacific and Indian Ocean islands, Africa, and New Zealand. In these areas it is often used as a commercial source of tannin or a source of firewood for local communities.
In some regions, introduced plants of this species are considered a weed. This is because they threaten native habitats by competing with indigenous vegetation, replacing grass communities, reducing native biodiversity and increasing water loss from riparian zones. In Africa, A. mearnsii competes with local vegetation for nitrogen and water resources, which are particularly scarce in certain regions, endangering the livelihoods of millions of people.
In its native range A. mearnsii is a tree of tall woodland and forests in subtropical and warm temperate regions. In Africa the species grows in disturbed areas, range/grasslands, riparian zones, urban areas, water courses, and mesic habitats at an altitude of between 600-1700m. In Africa it grows in a range of climates including warm temperate dry climates and moist tropical climates. A. mearnsii is reported to tolerate an annual precipitation of between, an annual mean temperature of, and a pH of 5.0 – 7.2. A. mearnsii does not grow well on very dry and poor soils.

Ecology in Australia

A. mearnsii plays an important role in the ecosystem in its native Australia. As a pioneer plant it quickly binds the erosion-prone soil following the bushfires that are common in its Australian habitats. Like other leguminous plants, it fixes the atmospheric nitrogen in the soil. Other woodland species can rapidly use these increased nitrogen levels provided by the nodules of bacteria present in their expansive root systems. Hence they play a critical part in the natural regeneration of Australian bushland after fires.
Mycorrhizal fungi attach to the roots to produce food for marsupial animals, and these animals in turn disperse the spores in their droppings to perpetuates the symbiotic relationship between wattle's roots and the mycorrhizal fungi.
The cracks and crevices in the wattle's bark are home for many insects and invertebrates. The rare Tasmanian hairstreak butterfly lays her eggs in these cracks, which hatch to produce caterpillar larva attended by ants that feed off the sweet exudates from the larva. A. mearnsii is used similarly as a larval host plant and food source by the imperial hairstreak, Jalmenus evagoras.
The tree is home to various grubs, such as wood moths, which provide a food source to the Australian black cockatoos, who strip the bark for access to these borers.
During winter insects, birds and marsupials are hosted by the black wattle with the aid of their supplies of nectar in their leaf axials. These creatures provide an important predatory role to deal with tree die back caused by scarab beetles and pasture pests.
Black wattles, along with gums, native box, native hop form the framework vegetation on so-called "hill-topping" sites. They are often isolated remnant pockets of native vegetation amongst a lower sea of exotic pasture. These "hill topping" sites are critical habitat for male butterflies to attract females for mating, which then lay their eggs under the wattle's bark elsewhere but still within close proximity. It's the only acceptable mating site in the area for these butterflies.
Black wattle flowers provide very nitrogen rich pollen with no nectar. They attract pollen-feeding birds such as wattlebirds, yellow-throated honeyeaters and New Holland honeyeaters. The protein rich nectar in the leaf axials is very sustaining for nurturing the growth of juvenile nestlings and young invertebrates, e.g. ants.
Ants harvest the seed, attracted by the fleshy, oil rich elaiosome, which they bury and store in widely dispersed locations. These seeds are buried ready for germinating with the next soaking rains. However a "wattle seed-eating insect' which enjoys liquid meals using its proboscis-like injector to pierce the testa and suck out the embryo often reduces the seeds viability.

Utility to Aboriginal People

The Ngunnawal people of the Australian Capital Territory use the gum as food and to make cement, and to ensure a supply of sap, the bark was cut in the autumn. The bark was also used to make coarse rope and string, and used to be infused in water to make a medicine for indigestion.

Reproduction

A. mearnsii produces copious numbers of small seeds that are not dispersed actively. The species may resprout from basal shoots following a fire. It also generates numerous suckers that result in thickets consisting of clones. Seeds may remain viable for up to 50 years.

Chemistry

, a flavan-3,4-diol and a monomer of the condensed tannins called profisetinidins, can be extracted from the heartwood of A. mearnsii.