❓ A WA parliamentary question seeks information on extinct and endangered plant species, their historical status, causes of extinction, and threats to current endangered species. The answer provides some specific details regarding causes of extinction and major threats.
AnsweredQoN 782Legislative Assembly
QuestionView source ↗
(1) I refer to the answer to question on notice No. 138 and ask, prior to European settlement, what was the likely status of each of the 17 now presumed extinct plants in Western Australia (widespread, locally common or rare)?
(2) What mechanisms, such as clearing for agriculture or altered fire regimes or pre existing rareness, are likely to have made each of these 17 species extinct in Western Australia?
(3) Do any of the 17 extinct species occur elsewhere in Australia?
(4) For plant species that are currently considered to be endangered, what are the major threatening processes for which remedial action is required as part of recovery plans?
(2) What mechanisms, such as clearing for agriculture or altered fire regimes or pre existing rareness, are likely to have made each of these 17 species extinct in Western Australia?
(3) Do any of the 17 extinct species occur elsewhere in Australia?
(4) For plant species that are currently considered to be endangered, what are the major threatening processes for which remedial action is required as part of recovery plans?
AnswerView source ↗
Answered
16 October 2001
Responded by
Minister for the Environment and Heritage
Response time
69 days
(2) Only one species ( Calothamnus accedens ) is known to have had the only known population of plants destroyed by human activity. This was as a result of road maintenance destroying a roadverge population in the wheatbelt. The causes of other species being presumed extinct is not known, although habitat loss due to land clearing may be a factor for species known to have been found in agricultural areas. (3) One species of flora presumed to be extinct in Western Australia, Taraxacum cygnorum , also occurs in Victoria and the Bass Strait islands, where it is considered to be threatened. (4) The major threatening processes for endangered flora in Western Australia that require remedial action under recovery plans are lack of suitable habitat, alteration of hydroecology, invasive weeds, grazing by introduced animals, Phytophthora dieback disease, inappropriate fire regimes, mining activities, accidental destruction including through roadworks, and small population sizes.
(3) One species of flora presumed to be extinct in Western Australia, Taraxacum cygnorum , also occurs in Victoria and the Bass Strait islands, where it is considered to be threatened. (4) The major threatening processes for endangered flora in Western Australia that require remedial action under recovery plans are lack of suitable habitat, alteration of hydroecology, invasive weeds, grazing by introduced animals, Phytophthora dieback disease, inappropriate fire regimes, mining activities, accidental destruction including through roadworks, and small population sizes.
(4) The major threatening processes for endangered flora in Western Australia that require remedial action under recovery plans are lack of suitable habitat, alteration of hydroecology, invasive weeds, grazing by introduced animals, Phytophthora dieback disease, inappropriate fire regimes, mining activities, accidental destruction including through roadworks, and small population sizes.
(3) One species of flora presumed to be extinct in Western Australia, Taraxacum cygnorum , also occurs in Victoria and the Bass Strait islands, where it is considered to be threatened. (4) The major threatening processes for endangered flora in Western Australia that require remedial action under recovery plans are lack of suitable habitat, alteration of hydroecology, invasive weeds, grazing by introduced animals, Phytophthora dieback disease, inappropriate fire regimes, mining activities, accidental destruction including through roadworks, and small population sizes.
(4) The major threatening processes for endangered flora in Western Australia that require remedial action under recovery plans are lack of suitable habitat, alteration of hydroecology, invasive weeds, grazing by introduced animals, Phytophthora dieback disease, inappropriate fire regimes, mining activities, accidental destruction including through roadworks, and small population sizes.
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