Pollination processes in Idiospermum australiense (Calycanthaceae), an arborescent basal angiosperm of Australia's tropical rain forests

Worboys, S.J., and Jackes, B.R. (2005) Pollination processes in Idiospermum australiense (Calycanthaceae), an arborescent basal angiosperm of Australia's tropical rain forests. Plant Systematics and Evolution, 251 (2-4). pp. 107-117.

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Idiospermum australiense (Diels) S.T. Blake, a rainforest canopy tree restricted to a few small populations in northeast Australia, is the only southern hemisphere representative of the Calycanthaceae. Pollination processes in Idiospermum were investigated. Flowers are protogynous, with some populations of the species being andromonoecious, whilst others are hermaphrodite. Over their 10 – 16 day floral lifespan, movements of floral organs enforced spatial and temporal separation of male and female floral function. Changes in colour and intensity of fragrance may also influence their attractiveness to potential pollinators. Pollen is present in large quantities, and appears to act as a reward for floral visitors. Insect trapping was carried out both within flowers, and immediately adjacent to inflorescences. A wide variety of arthropods was trapped, with thrips being the most abundant. Other arthropods were trapped, including fourteen species of beetle. For arthropods other than thrips, the mean numbers of adults trapped on flowers remained more or less constant throughout the floral lifetime. However, there was a significant interaction between floral age and the number of pre-adult arthropods present – as the flower aged, the mean number of larvae and eggs per flower increased. The flowers appear to act as sheltered mating and brooding sites for small insects.

Item ID: 17623
Item Type: Article (Research - C1)
ISSN: 1615-6110
Keywords: Idiospermum australiense; Calycanthaceae; floral biology; pollination; entomophily; floral evolution
Funders: Wet Tropics Management Authority
Date Deposited: 03 Aug 2011 06:39
FoR Codes: 06 BIOLOGICAL SCIENCES > 0602 Ecology > 060299 Ecology not elsewhere classified @ 50%
06 BIOLOGICAL SCIENCES > 0607 Plant Biology > 060799 Plant Biology not elsewhere classified @ 50%
SEO Codes: 96 ENVIRONMENT > 9608 Flora, Fauna and Biodiversity > 960806 Forest and Woodlands Flora, Fauna and Biodiversity @ 100%
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