Differences in the Stand Structure of Eucalyptus tetrodonta Forests Between Elcho Island and Gunn-Point, Northern Australia

1993 ◽  
Vol 41 (2) ◽  
pp. 211 ◽  
Author(s):  
DMJS Bowman ◽  
WJ Panton

Eucalyptus tetrodonta dominated open forests occur across the northern coast of the Northern Territory. They typically have a well developed grass understorey, scattered saplings, numerous woody sprouts (ramets) and a conspicuous absence of seedlings (genets). We compared a typical E. tetrodonta stand on Gunn Point with an atypical stand on Elcho Island; the forest on Elcho Island had less grass cover, greater canopy and litter cover, a deeper organic layer and higher densities of seedlings, woody sprouts and saplings than on Gunn Point. Gunn Point had a greater number of large E. tetrodonta trees that were more widely spaced than trees on Elcho Island. The cause of these differences remains unclear.

2000 ◽  
Vol 48 (5) ◽  
pp. 629 ◽  
Author(s):  
A. P. O'Grady ◽  
X. Chen ◽  
D. Eamus ◽  
L. B. Hutley

Savanna communities dominate the wet–dry tropical regions of the world and are an important community type in monsoonal northern Australia. As such they have a significant impact on the water and carbon balance of this region. Above the 1200-mm isohyet, savanna’s are dominated by Eucalyptus miniata–E. tetrodonta open forests. We have described in detail the composition and structure as well as seasonal patterns of leaf area index and above-ground biomass in the E. miniata–E. tetrodonta open forests of the Gunn Point region near Darwin in the Northern Territory of Australia. In all, 29 tree species from four phenological guilds were recorded in these forests. Stand structure suggests that the forests were still recovering from the impacts of cyclone Tracy and subsequent frequent fires. Eucalyptus miniata and E. tetrodonta were significant contributors to overstorey leaf area index and standing biomass (>70%), and both leaf area index and biomass were strongly correlated to basal area. Leaf area index was at a maximum (about 1.0) at the end of the wet season and declined over the dry season by about 30–40%. There were proportionally greater changes in the understorey reflecting the greater contribution of deciduous and semi-deciduous species in this strata. Standing biomass was about 55 t ha –1 . Detailed descriptions of leaf area index and biomass are important inputs into the development of a water and carbon balance for the savanna’s of northern Australia.


1986 ◽  
Vol 20 (1) ◽  
pp. 70-76 ◽  
Author(s):  
John Cawte

The kava bowl, a traditional feature of Pacific Island societies, has been adopted and adapted by a number of Aboriginal (Yolngu) communities of northern Australia, where it was introduced in the hope that it would challenge alcohol. This paper reports a study of its usage at Elcho Island, Northern Territory. At the high level of intake in this community, medical effects hitherto unreported are being observed. Some, such as a condition of detachment, reminiscent of the archetypal ‘blissful indolence’ of the lotus-eaters of Greek tradition as limned by the poet Homer, are obvious to the lay observer. Other effects are apparently advantageous for the management of alcohol abuse and some forms of psychosis. A surprising effect is the occurrence of a pellagrinous reaction. These observations indicate that further studies of the clinical effects and the human metabolism of high dosage kava are needed. Looming over all are questions of pharmacology. Do the kava pyrones possess anxiolytic or antipsychotic properties? Do they indeed have the property for which Pacific missionaries introduced them to Australia, as an alternative to alcoholism?


Soil Research ◽  
1972 ◽  
Vol 10 (1) ◽  
pp. 43 ◽  
Author(s):  
BG Williams

Soil salinity, pH, and Eh were determined in two soil types on the Adelaide River plains (Northern Territory) throughout the growing period of a rice crop. Both the total salinity, as indicated by specific conductivity values of the soil solution, and individual ion species were followed at 30 sites in each soil. The results demonstrated the existence of salt gradients within the soil profiles and these gradients, together with the total salt concentration and ion ratios, remained relatively constant throughout the growing season. The results are discussed in terms of experimental methods commonly employed for determining the effects of soil solution properties on rice culture.


Soil Research ◽  
1979 ◽  
Vol 17 (3) ◽  
pp. 483 ◽  
Author(s):  
J Mott ◽  
BJ Bridge ◽  
W Arndt

Stable bare degraded areas exist in the lightly grazed perennial grass understorey existing in the eucalypt woodlands of northern Australia. Examination of these areas showed large differences in infiltration which led to increased runoff from the bare sites. However, there was little difference in soil composition between grass-covered and degraded sites apart from a higher organic carbon content in surface soil under grass. Micromorphological examination showed that soil without grass cover had lost its original open structure in the surface layers, developing a surface seal. The surface soil of the bare sealed area was shown to slake readily under quick wetting in contrast to soil surface under grass cover which did not slake. Heavy grazing of the grass understorey destroyed grass clumps within two wet seasons. Once the clumps were killed the soil surface quickly collapsed to form sealed areas, with the same properties as those occurring in ungrazed sites. The persistence of the bare sealed areas is attributed to seed removal during runoff, high temperatures and low moisture content in the sealed layer, as well as mechanical impedance preventing seedling emergence. As re-establishment of native grasses is difficult in this region, care must be taken in pastoral management to prevent the formation of degraded sites, which may take many years to re-vegetate.


Zootaxa ◽  
2012 ◽  
Vol 3546 (1) ◽  
pp. 1 ◽  
Author(s):  
CONRAD J. HOSKIN ◽  
PATRICK J. COUPER

Scincid lizards belonging to the genus Carlia are found in eastern and northern Australia and in New Guinea andassociated islands. These skinks are a particularly diverse component of the reptile fauna of north-east Australia. Carliapectoralis (de Vis 1884) was formerly regarded as occurring over much of eastern Queensland, in north-east Australia.Here we show that it consists of four species: Carlia pectoralis, Carlia decora sp. nov., Carlia rubigo sp. nov. and Carliainconnexa Ingram & Covacevich 1989 (which was formerly described as a subspecies of C. pectoralis). Herein, wedescribe two new species, elevate C. p. inconnexa to full species status with a revised description, and redescribe C.pectoralis sensu stricto. The four species differ in aspects of scalation, morphology and colour pattern. Carlia decora sp.nov. occurs in vine thickets, rainforest margins and moist open forests in high rainfall coastal areas of mid-east and north-east Queensland. Carlia rubigo sp. nov. occurs in dry open forests of inland eastern Queensland and in some coastal areasof mid-eastern Queensland. Carlia pectoralis is distributed through open forests of south-east Queensland. Carliainconnexa is restricted to rocky open forests on islands of ‘the Whitsundays’ off mid-eastern Queensland. The addition of these three species brings the number of Australian Carlia to 22 species, 17 of which are found in Queensland.


2016 ◽  
Vol 64 (5) ◽  
pp. 303 ◽  
Author(s):  
Michael Westerman ◽  
Mark J. Blacket ◽  
Ashley Hintz ◽  
Kyle Armstrong ◽  
Patricia A. Woolley ◽  
...  

Multiple mitochondrial and nuclear gene sequences reveal substantial genetic variation within the dasyurid marsupial genus Planigale, suggesting greater taxonomic diversity than is currently recognised. To further investigate planigale relationships 116 new mitochondrial and nuclear gene sequences, including 16 new specimens, were added to our database. We confirm the presence of an unrecognised species (Planigale ‘species 1’) limited to the Pilbara region of Western Australia and suggest that the ‘Mt Tom Price’ animals may be closely related to Planigale ingrami subtilissima. We also confirm that at least four distinct genetic lineages make up what is currently recognised as P. maculata. This complex of closely related taxa represents a radiation of sibling species rather than a single, genetically diverse one. Three of these lineages (M1 + M2, M3 and M4) are distributed sympatrically across the Top End of Australia and one (M5 = P. maculata sensu stricto) is localised to the eastern coast of Australia. Within the Planigale ingrami complex, Planigale ‘Mt Tom Price’ (lineage Ing. 1) occurs in the Pilbara in sympatry with Planigale ‘species 1’ and lineage Ing. 2 is found in the Northern Territory in sympatry with species of the P. maculata complex. There is thus a plethora of northern Australian planigales, many of which are formally undescribed and whose geographic ranges require careful re-evaluation.


1995 ◽  
Vol 28 (2) ◽  
pp. 127-142 ◽  
Author(s):  
William Tyler

Recent attempts to involve the remote and small town communities of Northern Australia in their own policing and correctional services have often been held up as a model for developing Aboriginal criminal justice policies. Such a proposal raises important questions as to both the construction of the post-colonial ‘community’ in remote and settled Australia and the sociological principles by which these criminal justice schemes (eg night patrols, community wardens, community corrections) have been constituted. The paper explores the constructions of the Aboriginal community over the past two decades (ethnographic, politico-administrative and postmodernist) as a background to the development and implementation of community-based criminal justice schemes in the Northern Territory. A typology of post-colonial criminal justice strategies is developed which identifies four ‘ideal types’ in which the initiatives may be positioned. These are the mediative (community wardens, night patrols), the educative (community justice programs), the neo-colonialist (new forms of imposed European laws and policing) and the incorporative (pervasive and totalising forms of control). The possibility of transposing these Northern Territory schemes to other Aboriginal situations is then critically evaluated in the light of differing socio-political constructions of ‘community’.


1981 ◽  
Vol 8 (3) ◽  
pp. 207-215 ◽  
Author(s):  
J. E. Gardner ◽  
J. G. Nelson

At the very general level, the aim of this paper is to compare the interaction of national parks and native peoples in Northern Canada (Yukon Territory), Alaska, and the Northern Territory of Australia. Currently these areas are subject to increasing land-use pressures from mining, industrial development, the creation of national parks and related reserves, and native attempts to maintain traditional wildlife and renewable resource use. The study focuses on the interactions between national parks and native peoples on the premise that experiences can be compared and problems encountered in one area but possibly avoided in another.The study begins by briefly describing native land-use issues, land-rights arrangements, and organizations, in the Yukon Territory, central Alaska, and Northern Australia. The national park agencies are described, compared, and shown to differ considerably in institutional character, field of management, control of land, and external links with interest groups such as native peoples. Case-studies of the national parks etc. named Kluane (Yukon), Gates of the Arctic (Alaska), and Kakadu (Northern Territory of Australia), are presented to provide more details on similarities and differences in planning, types of tenure, native subsistence activities, and other factors.In the Yukon Territory, neither the national parks agency nor the native people are highly motivated to interact. In contrast, the park agencies and native people in Alaska and the Northern Territory of Australia recognize mutual benefits from interaction—largely as a result of legislation and policies which encourage cooperation. Native involvement officers now facilitate coordination in the Yukon and Alaska. Park agency native employment programmes are proceeding in all three ‘hinterlands’, while native people can own land on which national parks are established in Alaska and the Australian Northern Territory. Only in Australia are native people known to be directly involved in upperlevel national park management. Potential limitations on native subsistence and associated use of national parks range from moderate to severe, and are only defined clearly in Alaska. Lack of definition leads to confusion in deciding upon native use, while exceedingly precise definition precludes flexibility at the park level.A number of aids to a more mutually satisfactory interaction can be identified. One is motivation, or recognition by both parties that there are advantages to consultation and cooperation. Another, not yet achieved in the Yukon, is a land-claims settlement, stating the legislated rights of native peoples in the ‘hinterlands’ and giving them a land-holding and bargaining status which is comparable with that of government agencies. A third aid is comprehensive systematic and regional planning efforts involving opportunities for informed input from all affected parties. Such planning would provide a forum for consideration of a variety of interests, including national parks and native peoples. Finally, satisfactory interaction on the park site could be assisted by clear yet flexible means of deciding upon acceptable native use of parkland, the conservation of wildlife, and associated economic and cultural factors.


2020 ◽  
Author(s):  
Alana de Laive ◽  
Chris J. Jolly

ABSTRACT Chameleon Dragons Chelosania brunnea Gray, 1845 are well known amongst naturalists of northern Australia as being one of the most cryptic and least frequently observed of Australia’s large, iconic lizards. Despite their broad distribution across the savanna woodlands that dominate northern Australia, very few records exist of this species and, as a consequence, nearly nothing is known about their natural history. Here, we present records of 19 Chameleon Dragons, detected during clearing activities of a small area of semi-arid woodland at Delamere Air Weapons Range, Northern Territory. Additionally, we provide notes on sexual dimorphism, antipredator behaviour and shelter site use in this species. We discuss how some of this novel information may explain why this species is so rarely detected and suggests that this cryptic agamid may be much more common in savanna woodland than currently appreciated.


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