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An investigation of long-distance dispersal based on species native to both Tasmania and New Zealand
Jordan, GJ (2001) An investigation of long-distance dispersal based on species native to both Tasmania and New Zealand. Australian Journal of Botany, 49 (3). pp. 333-340.
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Some 200 species of plants are currently recognised as being native to both Tasmania and New Zealand. It is argued that dispersal across the 1500-2000 km Tasman Sea has occurred in all of these species. Almost all (187) are herbs, and constitute over 20% of the herbaceous flora of Tasmania. Common species, non-dioecious species, species with very small seeds, species from aquatic, coastal or wet habitats and possibly species with hooked fruit are all over-represented among the disjunct species of herbs. The incidence of disjunct species also varies significantly among families. In contrast, fleshy-fruited species, or species with plumes or very hairy disseminules are not over-represented among the herbaceous disjunct species. This data is used to model the probability that a species (past or present) with given traits would show a within-species trans-Tasman disjunction, and it is inferred that this can be used to give a crude approximation of the rates of long-distance dispersal for different types of species. The model can be tested using molecular clock methods, and could be made more robust by incorporating equivalent data from other disjunct regions.
|Keywords:||vicariance, gondwana, historical biogeography, seed size, zoochory, alpine, wetland, anemochory, dispersal|
|Journal or Publication Title:||Australian Journal of Botany|
|Page Range:||pp. 333-340|
|Identification Number - DOI:||10.1071/BT00024|
|Additional Information:||The definitive version is available online at http://www.publish.csiro.au/nid/65/paper/BT00024.htm|
|Date Deposited:||02 Sep 2007|
|Last Modified:||18 Nov 2014 03:21|
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