Primary production of benthic micro-organisms in South West Arm, Port Hacking, New South Wales

1983 ◽  
pp. 147-166 ◽  
Author(s):  
Max S. Giles
Keyword(s):  
Primary Production ◽  
New South ◽  
New South Wales ◽  
South West ◽  
South Wales ◽  
Micro Organisms

Distributions of species of the Antechinus stuartii-A. flavipes complex as predicted by bioclimatic modelling

2002 ◽  
Vol 50 (1) ◽  
pp. 77 ◽  
Author(s):  
M. S. Crowther
Keyword(s):  
High Temperatures ◽  
New South ◽  
New South Wales ◽  
Taxonomic Revision ◽  
Climatic Indices ◽  
Far North ◽  
South West ◽  
South Wales ◽  
Bioclimatic Modelling ◽  
Antechinus Stuartii

Previous work on bioclimatic mapping of species within the Antechinus stuartii–A. flavipes complex has been carried out, but this was before A. subtropicus was recognised and a complete taxonomic revision of the complex had been completed. This revised study of bioclimatic modelling of species within the A. stuartii–A. flavipes complex indicates substantial differences between the four species (A. stuartii, A. agilis, A. subtropicus and A. flavipes) in 35 climatic indices. A. stuartii is predicted to have a near-coastal distribution in northern and central New South Wales stretching as far south as Kioloa and as far north as south-eastern Queensland, avoiding the far coastal strip. A. agilis is predicted to have an extensive distribution in Victoria and southern New South Wales as far north as western Sydney; it is also predicted to occur in Tasmania, even though there is no evidence of it ever occurring there. A. flavipes is predicted to have an extensive inland and coastal distribution much larger than its recorded distribution. A. subtropicus is predicted to have a very narrow distribution in areas with high seasonal rainfall and high temperatures with low seasonality. All species are predicted to occur sympatrically, with A. stuartii and A. agilis predicted to have extensive overlap on the coast near Kioloa and to the immediate west and south-west of Sydney.

The Birds of South-west New South Wales

1961 ◽  
Vol 61 (1) ◽  
pp. 21-55 ◽  
Author(s):  
J. N. Hobbs
Keyword(s):  
New South ◽  
New South Wales ◽  
South West ◽  
South Wales

Fire studies in Mallee (Eucalyptus spp.) communities of western New South Wales: spatial and temporal fluxes in soil chemistry and soil biology following prescribed fire

1995 ◽  
Vol 2 (4) ◽  
pp. 398 ◽  
Author(s):  
J. C. Noble ◽  
D. J. Tongway ◽  
M. M. Roper ◽  
W. G. Whitford
Keyword(s):  
Electrical Conductivity ◽  
Soil Chemistry ◽  
Nitrogenase Activity ◽  
New South ◽  
New South Wales ◽  
Bare Soil ◽  
Soil Samples ◽  
Soil Biology ◽  
South Wales ◽  
Micro Organisms

The effects of prescribed fires on nutrient pools, soil micro-organisms, and vegetation patch dynamics were studied in three semi-arid mallee shrublands in western New South Wales. Repeated sampling of surface soil strata (0–2 and 2–4 cm) was undertaken at strategic times (immediately before and after the fire, after opening autumn rain, mid-season in the winter, and at the end of the spring) in five microsites (inner, middle and outer mallee litter zones, bare soil, and Triodia hummock). These samples were later analysed for pH, electrical conductivity, organic carbon and available nitrogen. The effect of fire on soil micro-organisms in these microsites was also examined by measuring nitrogenase activity and enumerating soil Acari. Carbon and nitrogen levels were consistently higher in the inner mallee microsites whereas bare soil sites provided the lowest values. Significant microsite x soil depth interactions were recorded in two shrubland sites while highly significant (P < 0.001) depth x sampling time interactions were recorded in three sites. The most sensitive soil parameter with respect to microsite was electrical conductivity, particularly in the surface 0–2 cm stratum. Highest values were again recorded from the inner mallee microsites and the lowest from bare soil sites. Nitrogenase activity was highest in soil samples associated with mallee litter and, where litter was removed by fire, activity decreased markedly except in the bare soil samples where activity was higher in the burnt samples. Soil microarthropod populations also declined notably following fire. Mites from the Prostigmata greatly outnumbered those from other suborders, a total of 12 families (15 genera) being enumerated in control sites compared with three families (three genera) only of Cryptostigmata. Nonetheless the most abundant mites were cryptostigmatids (Aphelacarus spp.) found in unburnt hummocks beneath Triodia plants. The ecological and management implications of these spatial and temporal fluxes in soil chemistry and soil biology are discussed in relation to their effects on landscape processes, particularly water and nutrient redistribution.

Diet of red foxes (Vulpes vulpes) in South-west New South Wales, with relevance to lamb predation.

1993 ◽  
Vol 15 (1) ◽  
pp. 39 ◽  
Author(s):  
IW Lugton
Keyword(s):  
Vulpes Vulpes ◽  
Oryctolagus Cuniculus ◽  
New South ◽  
New South Wales ◽  
Ovis Aries ◽  
Red Foxes ◽  
South West ◽  
South Wales ◽  
Preferred Foods ◽  
Autumn And Winter

The diets of 212 foxes (Vulpes vulpes) in the far south-west of New South Wales were determined between 1985 and 1989 and compared with other Australian studies. Mammalian remains, at an overall occurrence of 99.1%, formed the basis of the diet during the autumn and winter months. The most frequently occurring mammals were rabbits (Oryctolagus cuniculus) (34.9%), sheep (Ovis aries) (30.7%) and macropods (Macropus spp.) (20.3%). Insects occurred in 31.1% of stomachs and formed a substantial proportion of the diet. Fresh newborn lamb was identified in only 3.8% of all stomachs, but evidence of lamb consumption was 10 times greater (35.2%) from foxes collected near lambing flocks. Other studies around lambing flocks have also shown a high occurrence of fresh lamb in fox stomachs and there is circumstantial evidence that predation of lambs by foxes can be common. It was concluded that lamb predation is likely to be severe where the fox population density is high, where older foxes predominate, and where alternative preferred foods are scarce. More research is required to confirm these observations.

Production of two species and two interspecific hybrids of phalaris under irrigation in south-west New South Wales

1980 ◽  
Vol 20 (103) ◽  
pp. 181 ◽  
Author(s):  
JW Read ◽  
JV Lovett
Keyword(s):  
White Clover ◽  
Nitrogen Fertilizer ◽  
Interspecific Hybrids ◽  
New South ◽  
New South Wales ◽  
Paspalum Dilatatum ◽  
Suitable Alternative ◽  
South West ◽  
South Wales ◽  
High Production

Two phalaris hybrids (Siro 11 46 and allopolyploid) and the parent lines (Phalaris aquatica and P. arundinacea) were compared in monoculture with nitrogen fertilizer and in a mixed sward with white clover and lucerne. The experiment was flood irrigated and the effects of defoliating the swards at intervals of 21, 42 and 84 days were measured. The hybrid (Siro 11 46) was the most productive genotype at all defoliation intervals. Eighty one % of its annual yield occurred in spring and summer. This production imbalance renders Siro 11 46 unsuitable as the foundation of a pasture for high production throughout the year. The mixed sward produced more than the monoculture sward when defoliated every 21 or 42 days and there was increased production associated with increased defoliation interval. The monoculture sward was more productive than the mixed sward at an 84 day defoliation interval. The yield of Siro 1146 + white clover was 2.25 t ha-1 per 84 days, compared with a mean yield of phalaris + white clover of 1.78 t ha-1 per 84 days for the three other genotypes. The results indicate that Siro 11 46 grown with white clover and defoliated approximately every 42 days would be a suitable alternative pasture to Paspalum dilatatum and white clover in the two-pasture system used in irrigation areas of southern New South Wales. The problems of low acceptability and suspected toxicity of Siro 1146 are discussed.

scholarly journals Whole-farm profit and the optimum maternal liveweight profile of Merino ewe flocks lambing in winter and spring are influenced by the effects of ewe nutrition on the progeny's survival and lifetime wool production

2011 ◽  
Vol 51 (9) ◽  
pp. 821 ◽  
Author(s):  
J. M. Young ◽  
A. N. Thompson ◽  
M. Curnow ◽  
C. M. Oldham
Keyword(s):  
Western Australia ◽  
New South ◽  
New South Wales ◽  
Economic Modelling ◽  
Stocking Rate ◽  
Wool Production ◽  
South West ◽  
South Wales ◽  
Farm Profit ◽  
The Cost

Profitability of sheep production systems in southern Australia is optimised at a stocking rate that provides adequate nutrition for breeding ewes and enables efficient utilisation of grown pasture and supplements. In this paper we used bio-economic modelling to develop optimum liveweight1 profiles for spring-lambing Merino ewes in different environments. The modelling included the impacts of the ewe liveweight profile on the production of the ewe and the survival and lifetime wool production of her progeny. Fifteen ewe liveweight profiles were analysed for each region to determine the profitability of varying ewe liveweight at joining, varying rate of loss of liveweight after joining and the rate of gain in liveweight from the minimum to lambing. The analyses support the hypotheses that whole-farm profitability is sensitive to the liveweight profile of Merino ewe flocks and that there is a liveweight profile that maximises whole-farm profit. The variation between the most and least profitable ewe liveweight profile was $69 0002 per farm ($14.30/ewe) for south-west Victoria, $51 000 per farm ($8.70/ewe) for Great Southern Western Australia and $33 300 per farm ($9.70/ewe) for southern New South Wales. The changes in profit were due to differences in costs of feeding to achieve the ewe liveweight profile and its influence on the production of both the ewes and their progeny. Failure to include the impacts of liveweight profile on progeny survival and lifetime wool production incorrectly identifies the optimum ewe liveweight profile and provided inaccurate estimates of profitability. The optimum liveweight profiles for ewes lambing in spring were similar for all three regions and insensitive to changing commodity prices, pasture productivity and management. The optimum profile was to join ewes at ~90% of the standard reference weight of the genotype, lose a small amount of weight after joining and regain weight in late pregnancy to return to the joining weight by lambing. Regaining the liveweight lost in early pregnancy by lambing is the most important target to achieve. The cost per farm of missing this liveweight target by 1 kg was $13 000 ($2.60/ewe) for south-west Victoria, $8900 ($1.45/ewe) for Great Southern Western Australia and $5500 ($1.65/ewe) for southern New South Wales. By contrast, the cost per farm of missing the joining target by 1 kg was $5500 for south-west Victoria and less than $2000 across the other two regions. Whole-farm profit increased with increasing stocking rate up to an optimum and regardless of stocking rate there is an additional opportunity to increase whole-farm profit by up to 15% by managing ewes to achieve the optimum liveweight profile. This indicates that the optimum liveweight profile should be achieved by increasing the level of grain feeding and altering the timing of utilising the farm feed resources rather than manipulating stocking rate.

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