Trend of Kangaroo Populations in New South Wales, Australia

Caughley, Graeme; Sinclair, RG; Grigg, Gordon C.

doi:10.2307/3808761

The Journal of Wildlife Management

1979

DOI: 10.2307/3808761

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Trend of Kangaroo Populations in New South Wales, Australia

Graeme Caughley¹,

RG Sinclair²,

Gordon C. Grigg³

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Cited by 4 publications

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Western grey kangaroos, Macropus fuliginosus, in the South Australian pastoral zone: populations at the edge of their range

Cairns¹,

Grigg²,

Beard³

et al. 2000

Wildl. Res.

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As part of a large-scale monitoring program linked to the management of kangaroos in the South Australian pastoral zone, the western grey kangaroo populations have been surveyed annually with fixed-wing aircraft over the 15-years-period 1978–92. Western grey kangaroos are restricted in their distribution to the southern regions of the pastoral zone. During the period of the study, western grey kangaroo numbers showed no long-term trends, but did show some marked fluctuations, principally in association with a severe drought. Despite this, and unlike red kangaroos in the South Australian pastoral zone, no consistent, direct association between changes in western grey kangaroo numbers and antecedent rainfall could be demonstrated. The postulated reason for this is that most of the regional western grey kangaroo populations examined in this study were low-density populations at the edge of the range of this species. Outside of drought, these populations are likely to be limited by factors other than food, such as climate and unmodified resources in the form of suitable habitat. Also, because boundary populations may well only be maintained by constant loss and recolonisation, local extinctions associated with drought may result in extended delays in the re-establishment of populations in marginal areas. Over the period 1978–92, these populations were harvested commercially at annual rates of 5–25%, which were, on the whole, considered to be below the rates suggested to be maximum and sustainable.

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Western grey kangaroos, Macropus fuliginosus, in the South Australian pastoral zone: populations at the edge of their range

Cairns¹,

Grigg²,

Beard³

et al. 2000

Wildl. Res.

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Trends in numbers and changes in the distribution of feral goats (capra hircus) in the South Australia pastoral zone

Pople¹,

Grigg²,

Cairns³

et al. 1996

Wildl. Res.

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Trends in numbers and changes in the distribution of feral goats in the South Australian pastoral zone (217300 km*2) during 1978-94 were determined by winter aerial surveys. Only the presence or absence of goats on sample units was scored between 1978 and 1988. On the assumption of a random distribution of goat groups, these indices were transformed to densities of goat groups. Between 1989 and 1994 actual goat numbers were recorded on each sample unit, allowing goat density to be estimated. Goats were consistently at their highest densities in the south-east of the pastoral zone, a region dominated by open mallee scrub and chenopod shrubland. Densities of goat groups fluctuated from a low in 1984, following a drought, to a peak in 1990, following above-average rainfalls, when there were an estimated 193700 +/- 29600 goats in the pastoral zone. This estimate is conservative because it is uncorrected for the visibility bias associated with sighting groups and undercounting their sizes. The estimate also excludes the Flinders Ranges for which a similar number of goats has been estimated.

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Population Dynamics of Red Kangaroos (Macropus rufus) in Relation to Rainfall in the South Australian Pastoral Zone

Cairns¹,

Grigg²

1993

The Journal of Applied Ecology

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Trend of Kangaroo Populations in New South Wales, Australia

Cited by 4 publications

References 0 publications

Western grey kangaroos, Macropus fuliginosus, in the South Australian pastoral zone: populations at the edge of their range

Western grey kangaroos, Macropus fuliginosus, in the South Australian pastoral zone: populations at the edge of their range

Trends in numbers and changes in the distribution of feral goats (capra hircus) in the South Australia pastoral zone

Population Dynamics of Red Kangaroos (Macropus rufus) in Relation to Rainfall in the South Australian Pastoral Zone

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