Acoustic analysis of an intergrade zone between two call races of the Limnodynastes tasmaniensis complex (Anura : Leptodactylidae) in south-eastern Australia

1975 ◽  
Vol 23 (1) ◽  
pp. 113 ◽  
Author(s):  
MJ Littlejohn ◽  
JD Roberts
Keyword(s):  
Acoustic Analysis ◽  
Secondary Contact ◽  
Ecological Gradient ◽  
North Central ◽  
Call Structure ◽  
Central Victoria ◽  
South Eastern ◽  
Eastern Australia ◽  
Mating Calls ◽  
South Eastern Australia

Mating calls of the northern and southern call races of the L. tasmaniensis complex are described. Analysis of call structure along a transect across the main contact between these allopatric forms in north central Victoria indicates that there is a zone of intergradation between 90 and 135 km wide, about 215 km long and with a north-westerly orientation. The interaction is interpreted as a secondary contact in which there is hybrid or recombinant superiority along a subtle ecological gradient.

Use of Nest Trees by the Mountain Brushtail Possum (Trichosurus Caninus) (Phalangeridae: Marsupialia). I. Number of Occupied Trees and Frequency of Tree Use.

1996 ◽  
Vol 23 (3) ◽  
pp. 343 ◽  
Author(s):  
DB Lindenmayer ◽  
A Welsh ◽  
CF Donelley ◽  
RA Meggs
Keyword(s):  
Adult Female ◽  
Adult Male ◽  
Brushtail Possum ◽  
Radio Tracking ◽  
Central Victoria ◽  
South Eastern ◽  
Eastern Australia ◽  
South Eastern Australia

A study was made of the use of trees with hollows by 10 adult male and 6 adult female mountain brushtail possums (Trichosurus caninus) at a 35-ha site in central Victoria, south-eastern Australia. Radio-tracking was used to identify which trees were being used as den sites by animals during an 18-month period between September 1990 and March 1992. Analyses of the data showed that, although 113 different trees were used by the 16 animals, most were occupied infrequently. The total number of trees used by a given animal ranged from 5 to 23. However, the majority of individuals spent most of their time denning in 1-3 trees. Of the 113 den trees, 70 were found to have been used by only 1 animal, 54 trees were used exclusively by males, and 28 trees by females only. Twelve trees were used extensively (on >40 occasions) but only 1 was used extensively by both sexes. Most of the T. caninus radio-tracked typically used 2 or more nest trees per week, indicating that animals moved frequently between den sites. Some animals used up to 6 different trees per week. Some possible reasons for this behaviour in T. caninus are discussed.

Effect of fallowing practices on runoff and soil erosion in south-eastern Australia

1985 ◽  
Vol 25 (3) ◽  
pp. 628 ◽  
Author(s):  
JW Cooke
Keyword(s):  
Soil Erosion ◽  
Rough Surface ◽  
Soil Loss ◽  
Soil Surface ◽  
North Central ◽  
Central Victoria ◽  
South Eastern ◽  
Eastern Australia ◽  
Chemical Fallow ◽  
Runoff And Soil Loss

The effect on runoff and soil loss of four methods of preparation of fallow was investigated at each of three sites in north-central Victoria. There was a chemical fallow treatment (uncultivated) and three scarified treatments (smooth, medium and rough cultivation). When the results from the three sites were combined, there was 10.7 mm runoff from the uncultivated treatment, 5.1 mm from the smooth, 0.8 mm from the medium and 0.3 mm from the rough scarified treatments. Soil loss from the uncultivated treatment was 103 g/m2 compared with 87 g/m2 from the smooth, 22 g/m2 from the medium and 13 g/m2 from the rough treatment. The concentration of sediment in the runoff was negatively correlated (R2 = -0.56 to -0.98) with runoff. It ranged from 1.21% (w/w) for the uncultivated to 5.06% (w/w) for the rough scarified treatment. The results show that a regimen of minimum scarification to produce a rough surface, and then use of herbicides to control weeds, reduces soil loss compared with either an uncultivated or a smoothly cultivated soil surface.

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