The distribution of Carrichtera annua in Australia: Introduction, spread and probable limits
Date
2011
Authors
Cooke, Julia
Groves, R.H.
Ash, Julian
Journal Title
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Publisher
Australian Rangeland Society
Abstract
Carrichtera annua (L.) DC. (Brassicaceae) or Ward's Weed, a major weed of semi-arid rangelands of southern Australia, has been collected widely since its introduction early in the 20th century. Collated records were used to suggest a single site of accidental introduction in South Australia, evidence of a lag phase of ∼30 years (probably due to edaphic restrictions) before rapid spread, involving infrequent long-distance human-aided dispersal across southern Australia and a relatively stable range since the 1960s. Climate and soil analyses suggest that abiotic factors limit the distribution of C. annua, with the species being restricted to areas with winter-dominated rainfall and calcareous soils. Documentation of the history of a successful invasion, including the spread and probable limits of the current distribution of a species, is important for managing invasions. This study also highlights that a single, accidental introduction can result in a long-lasting, widespread problematic weed.
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Keywords
Keywords: Brassicaceae; Carrichtera annua climate; exotic; invasive; Mediterranean; soil type; weed.
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Source
The Rangeland Journal
Type
Journal article
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Restricted until
2037-12-31
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