Observations on the effectiveness of shooting feral pigs from helicopters.

1993 ◽  
Vol 20 (6) ◽  
pp. 771 ◽  
Author(s):  
G Saunders
Keyword(s):  
New South ◽  
New South Wales ◽  
Reduction Rate ◽  
Population Recovery ◽  
Management Implications ◽  
Feral Pigs ◽  
Removal Method ◽  
South Wales ◽  
Population Reduction ◽  
Rate Of Increase

The use of helicopters for the shooting of feral pigs in western New South Wales has become increasingly popular and widespread. Studies were conducted to evaluate the effectiveness of this practice in terms of population reduction, rate of population recovery and cost. The study site was an area of 120 km*2 on the southern edge of the Macquarie Marshes. Estimated population reductions, calculated by the index-removal method, over two consecutive years were 80 and 65%. The associated rate of increase (r) in the 12 months following the first population reduction was 1.34, which is equivalent to a recovery of 77% in numbers. Results and levels of control inputs were collated for an additional consecutive year and compared with other studies. Management implications from this study are also considered.

Fire in the Mallee Shrublands of Western New South Wales.

1980 ◽  
Vol 2 (1) ◽  
pp. 104 ◽  
Author(s):  
JC Noble ◽  
AW Smith ◽  
HW Leslie
Keyword(s):  
Case Studies ◽  
Prescribed Burning ◽  
New South ◽  
New South Wales ◽  
Management Implications ◽  
South Wales ◽  
Wildfire Hazard ◽  
Western Division

This article describes the effects of the 1974175 wildfires on the mallee vegetation in the Western Division of New South Wales using two properties as case studies. The management implications arising from these experiences are described in some detail, particularly the potential for some form of management based on periodic prescribed burning to promote herbage productivity and also to reduce any future wildfire hazard. The need for appropriate research to be undertaken in this field is also discussed.

Predation of Red Kangaroos, Macropus rufus, by the Dingo, Canis familiaris dingo (Blumenbach) in North-Western New South Wales

1981 ◽  
Vol 8 (2) ◽  
pp. 255 ◽  
Author(s):  
NC Shepherd
Keyword(s):  
New South ◽  
New South Wales ◽  
Pathological Finding ◽  
South Wales ◽  
Daily Rate ◽  
Rate Of Increase ◽  
Border Fence ◽  
Selection For ◽  
The Difference ◽  
North Western

Over 7 weeks a group of five dingoes killed 83 red kangaroos within 150 m of a watering point in north-western New South Wales. All except three of these kangaroos were juveniles. Detailed autopsies were performed on 17 of the dead kangaroos: primary predation was the only significant gross pathological finding; the dingoes had eaten portions from about half the kangaroos killed. The daily rate of killing was estimated to be about 0.38 kg prey per kg predator. The rate of killing and the selection for juvenile kangaroos suggested that dingoes could have a direct effect on kangaroo densities by limiting rate of increase. The significance of this finding is discussed with reference to the difference in abundance of kangaroos between the New South Wales and Queensland sides of the border fence.

The Demography of Feral Pigs (Sus Scrofa) in Kosciusko National Park, New South Wales.

1993 ◽  
Vol 20 (5) ◽  
pp. 559 ◽  
Author(s):  
G Saunders
Keyword(s):  
National Park ◽  
New South ◽  
Seasonal Pattern ◽  
New South Wales ◽  
Protein Food ◽  
Feral Pigs ◽  
South Wales ◽  
Postnatal Mortality ◽  
Alpine Population ◽  
Autumn And Winter

The demography of a sub-alpine population of feral pigs was examined at Kosciusko National Park in south-eastern New South Wales. Reproductive data and age structures indicated a seasonal pattern of breeding, most births occurring in summer and autumn. It is proposed that a decreasing availability of high protein food in the autumn and winter months caused reduced rates of conception. Sows produced 0.84 litters per year with postnatal mortality as high as 85%. The population appeared relatively stable at a density of 1.6 pigs kg-2. Hunting, although illegal in a national park, removed 4.4-15.4% of pigs each year. The overall health and body condition of pigs was good, with no evidence of heavy parasitic burdens or disease. Age-specific body weight and body length in this study were greater than those reported for pigs in semi-arid wester New South Wales.

Movements and Home Ranges of Feral Pigs (Sus Scrofa) in Kosciusko National Park, New South Wales.

1996 ◽  
Vol 23 (6) ◽  
pp. 711 ◽  
Author(s):  
G Saunders ◽  
B Kay
Keyword(s):  
Home Range ◽  
National Park ◽  
New South ◽  
New South Wales ◽  
Home Range Size ◽  
Range Size ◽  
Home Ranges ◽  
Minimum Convex Polygon ◽  
Feral Pigs ◽  
South Wales

The movements of a subalpine population of feral pigs were examined at Kosciusko National Park in southeastern New South Wales. Sufficient data were collected to estimate the home-range area of 20 pigs on the basis of 782 telemetry and trap locations. Mean (+/- s.d.) home-range size (minimum convex polygon method) for males (35.0 t 22.2 km*2) was significantly greater than that for females (1 1.1 +/- 5.2 km*2). Use of capture-recapture distances to estimate home-range size was considered inappropriate. A test for nomadism suggests that, although home ranges of pigs in this environment were larger than those reported for other pigs in Australia, the pigs were essentially sedentary. Management implications for this population are discussed.

Aerial baiting of feral pigs (Sus scrofa) for the control of exotic disease in the semi-arid rangelands of New South Wales

2000 ◽  
Vol 27 (5) ◽  
pp. 531 ◽  
Author(s):  
Peter J. S. Fleming ◽  
David Choquenot ◽  
Richard J. Mason
Keyword(s):  
New South ◽  
New South Wales ◽  
Effective Density ◽  
Contingency Planning ◽  
Tissue Samples ◽  
Feral Pigs ◽  
The Third ◽  
South Wales ◽  
Arid Rangelands ◽  
North Western

An experiment that held the density of feral pigs constant while varying the effective density of aerially distributed baits was conducted at three sites in north-western New South Wales. Meat baits, containing one of the biomarkers iophenoxic acid, tetracycline or rhodamine B, were distributed at different intensities over each site, and a sample of pigs was shot from a helicopter at each site to determine bait uptake. Serum and tissue samples taken from each pig were analysed for the occurrence of the biomarkers; the proportions of pigs exhibiting biomarkers represented the proportions of the feral pig populations that had consumed baits at different baiting intensities (expressed as baits per unit of pig density). The maximum percentage of sampled pigs that had eaten baits varied from 31% to 72% across the three sites. Bait uptake was regressed against baiting intensity. For two of the trials, the quantity of bait hypothetically required to eliminate a population of feral pigs was extrapolated to be 1577 baits per unit of pig density, while for the third trial 1874 baits per unit of pig density would have been required. Bait-uptake by non-target animals was substantial, posing potential hazards to birds and reducing the availability of baits to feral pigs. Most likely, seasonal conditions affected bait-uptake by feral pigs. We discuss the implications of these results for exotic disease contingency planning.

Trends in Kangaroo Numbers in Western New South Wales and their relation to Rainfall

1984 ◽  
Vol 11 (3) ◽  
pp. 415 ◽  
Author(s):  
J Caughley ◽  
P Bayliss ◽  
J Giles
Keyword(s):  
Maximum Rate ◽  
New South ◽  
Time Lag ◽  
New South Wales ◽  
Annual Rainfall ◽  
The West ◽  
Annual Average ◽  
South Wales ◽  
Rate Of Increase ◽  
Average Annual Rainfall

Annual aerial counts of kangaroos within randomly selected blocks of the western plains of New South Wales showed that the numbers of kangaroos doubled between 1975-76 and 1982, and that the widespread drought of 1982 reduced the populations on average by 43%. Localized reductions of similar magnitude occurred after regional droughts in 1977 and 1980 within parts of the monitored area. The observed trends in kangaroo numbers, with eastern and western blocks treated separately, were correlated with annual rainfall with a time lag of 6 months in the response. The relationships show that kangaroos reach their maximum rate of increase following rainfall 100 mm above the annual average in the east and approximately 50 mm above the annual average in the west. At average annual rainfall kangaroos increase at 25% (greys) and 35% (reds) per annum in the east and at 25% (greys) and 30% (reds) per annum in the west. Rate of increase is zero when rainfall is 100 mm below average in the east and approximately 60 mm below average in the west. When rainfall is below these values, kangaroo numbers decline.

Detection of brucellosis and leptospirosis in feral pigs in New South Wales

2014 ◽  
Vol 92 (9) ◽  
pp. 343-347 ◽  
Author(s):  
C Ridoutt ◽  
A Lee ◽  
B Moloney ◽  
PD Massey ◽  
N Charman ◽  
...  
Keyword(s):  
New South ◽  
New South Wales ◽  
Feral Pigs ◽  
South Wales

Factors Affecting Bait Uptake and Trapping Success for Feral Pigs (Sus Scrofa) in Kosciusko National Park.

1993 ◽  
Vol 20 (5) ◽  
pp. 653 ◽  
Author(s):  
G Saunders ◽  
B Kay ◽  
H Nicol
Keyword(s):  
National Park ◽  
New South ◽  
Radio Telemetry ◽  
Cumulative Number ◽  
Factors Affecting ◽  
Feral Pigs ◽  
South Wales ◽  
Population Reduction ◽  
Time Of Year ◽  
Bait Stations

An evaluation of the rate and extent of population reduction that can be achieved by trapping feral pigs was conducted in a subalpine area of Kosciusko National Park in south-eastern New South Wales. Movements of pigs during the programme were monitored by radio-telemetry. In total, 142 pigs, including 12-17 (71%) previously fitted with transmitters and known to be still on the study site, were captured over 330 trap-nights at a cost of $A104 per pig. A model fitted to the change in percentage of bait stations eaten per day relative to the cumulative number of pigs caught estimated a population reduction of 62% of animals exposed to traps and only 28% of the entire population. Determinants of trap success are discussed. During the trapping evaluation and in 2 preceding seasons, factors that influenced the rate at which bait stations were found and eaten were also examined. Both the locality characteristics of bait stations and the time of year were found to have significant effects on this rate.

Predation by feral pigs on Merino lambs at Nyngan, New South Wales

1981 ◽  
Vol 21 (113) ◽  
pp. 570 ◽  
Author(s):  
PM Pavlov ◽  
J Hone ◽  
RJ Kilgour ◽  
H Pedersen
Keyword(s):  
New South ◽  
New South Wales ◽  
Feral Pigs ◽  
South Wales

The effects of feral pigs on the lambing performance of Merinos was studied at Nyngan, New South Wales. Ewes lambed in two paddocks; one with feral pigs and one with no pigs in autumn and spring in 1978 and 1979. Ewes were pregnancy tested before lambing, and after lambing, classified as dry, lactating or lambed-and-lost. Lambs were mustered weekly in three lambings. Pig movement in three lambings was controlled by electric fences. There were effects (P < 0.05) of feral pigs, years, seasons, and pigs x years on the percentage of ewes lactating, of those lambing. Feral pigs lowered the number of lambs per 100 ewes by 37.9 and 31.9 in autumn and spring 1978, respectively. In 1979 pig predation was an insignificant cause of lamb loss.

SPARGANOSIS IN FERAL PIGS IN NEW SOUTH WALES.

1954 ◽  
Vol 30 (5) ◽  
pp. 135-138 ◽  
Author(s):  
Hugh MCL. Gordon ◽  
B. A. Forsyth ◽  
Michael Robinson
Keyword(s):  
New South ◽  
New South Wales ◽  
Feral Pigs ◽  
South Wales
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