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    • Journal of Range Management, Volume 54 (2001)
    • Journal of Range Management, Volume 54, Number 4 (July 2001)
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    Low density of prickly acacia under sheep grazing in Queensland

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    Author
    Tiver, F.
    Nicholas, M.
    Kriticos, D.
    Brown, J. R.
    Issue Date
    2001-07-01
    Keywords
    regeneration
    weeds
    quarantine
    Queensland
    seed dispersal
    highlands
    rain
    seedlings
    pastures
    selective grazing
    woody plants
    rotational grazing
    sheep
    plant density
    introduced species
    browsing
    grazing
    plant height
    Life-stage profiles
    rainfall
    population dynamics
    regeneration
    cattle
    woody weeds
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    Citation
    Tiver, F., Nicholas, M., Kriticos, D., & Brown, J. R. (2001). Low density of prickly acacia under sheep grazing in Queensland. Journal of Range Management, 54(4), 382-389.
    Publisher
    Society for Range Management
    Journal
    Journal of Range Management
    URI
    http://hdl.handle.net/10150/643884
    DOI
    10.2307/4003107
    10.2458/azu_jrm_v54i4_tiver
    Additional Links
    https://rangelands.org/
    Abstract
    Populations of an introduced woody weed, prickly acacia (Acacia nilotica (L.) Delile ssp. indica (Benth.) Brenan syn. Acacia arabica (Lam.) Willd. ssp. indica Benth.), were surveyed at 4 sites in central Queensland. There is a significantly lower frequency of plants of 3 m in height within populations which have been grazed by sheep, indicating that browsing by sheep reduces regeneration. There were higher losses of seedlings at a sheep-grazed site than at cattle-grazed sites. These results support previous assertions that prickly acacia is regenerating more successfully on cattle properties, because cattle both disperse seeds and are less effective herbivores. In regions of low annual rainfall, prickly acacia is capable of forming dense stands (up to 2,700 shrubs ha(-1)) in lowland landscape types. Stands are less dense in upland landscapes (maximum of 718 shrubs ha(-1)). Of most concern is that in regions of high annual rainfall prickly acacia can form extremely dense thickets across most landscape types (up to 3,400 shrubs ha(-1)). We suggest that prickly acacia is most likely to become a management problem on cattle properties, and an extreme problem in high annual rainfall areas. The inclusion of sheep in livestock rotations may be an effective control measure in the Mitchell Grasslands, but this may not always be possible. A high priority is to prevent prickly acacia from expanding its range into equivalent high rainfall areas within Queensland, and also in the Northern Territory, northern New South Wales, and Western Australia. This could be achieved by quarantining livestock which have come from infested properties until seeds have passed through the digestive tract, after about 6 days. Management strategies at the property level should aim to prevent further spread of prickly acacia by controlling cattle movements between paddocks during periods when cattle are ingesting pods and seeds.
    Type
    text
    Article
    Language
    en
    ISSN
    0022-409X
    ae974a485f413a2113503eed53cd6c53
    10.2307/4003107
    Scopus Count
    Collections
    Journal of Range Management, Volume 54, Number 4 (July 2001)

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