Morphological variation in the mangrove genus Avicennia in Australasia: systematic and ecological considerations

Duke, N.C. (1990) Morphological variation in the mangrove genus Avicennia in Australasia: systematic and ecological considerations. Australian Systematic Botany, 3 (2). pp. 221-239.

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Morphological variation in flowers, fruits and leaves of A. alba, A. integra, A. lanata, A. marina and A. officinalis was assessed using multivariate techniques. Groupings based on 184 herbarium specimens gathered throughout the region showed no intermediates or potential hybrids between species. The most common and systematically troublesome species, A. marina, was considered further in a regional litterfall survey of 25 Australian sites, and in a detailed field study of eight locations within the Murray River estuary, Queensland. In both studies, morphological variation was correlated with environmental factors, including air temperature, rainfall, intertidal position and upriver location. Major differences were also observed within individuals, as shown in sun and shade leaves. These observations suggested that many attributes, especially of leaves, were affected by environmental factors, demonstrating their unsuitability in earlier systematic treatments. Other attributes reflecting putative subspecific genetic variation included bark character, extent of pubescence on calyx lobes, and stigma position in relation to anthers. These characterize three groupings of A. marina sites, related to major biogeographic zones within this region: southeastern Australia and New Zealand; northern and northeastern Australia and southern Papua New Guinea; and southwestern Australia.

Item ID: 48891
Item Type: Article (Research - C1)
ISSN: 1446-5701
Keywords: mangrove; plants; Avicennia; morphology; ecology; Australia; Asia; IWP
Funders: James Cook University (JCU), Australian Institute of Marine Science (AIMS)
Date Deposited: 10 May 2017 03:48
FoR Codes: 06 BIOLOGICAL SCIENCES > 0603 Evolutionary Biology > 060310 Plant Systematics and Taxonomy @ 30%
06 BIOLOGICAL SCIENCES > 0603 Evolutionary Biology > 060302 Biogeography and Phylogeography @ 40%
06 BIOLOGICAL SCIENCES > 0602 Ecology > 060205 Marine and Estuarine Ecology (incl Marine Ichthyology) @ 30%
SEO Codes: 97 EXPANDING KNOWLEDGE > 970106 Expanding Knowledge in the Biological Sciences @ 30%
96 ENVIRONMENT > 9608 Flora, Fauna and Biodiversity > 960802 Coastal and Estuarine Flora, Fauna and Biodiversity @ 40%
96 ENVIRONMENT > 9605 Ecosystem Assessment and Management > 960503 Ecosystem Assessment and Management of Coastal and Estuarine Environments @ 30%
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