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Title: The Pollination Ecology of 'Grevillia beadleana' McGillivray, an Endangered Shrub from Northern New South Wales, Australia
Contributor(s): Smith, J A (author); Gross, Caroline Lucie  (author)orcid 
Publication Date: 2002
DOI: 10.1093/aob.2002.mcf015
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Abstract: 'Grevillea beadleana' (Proteaceae) is an endangered species known from five populations in northern New South Wales, Australia. The reproductive ecology of 'G. beadleana' was compared in two populations with a ten-fold difference in the number of plants. 'Grevillea beadleana' was found to be self-compatible in both populations and an examination of pollen viability and stigma maturation revealed that the species is protandrous. Flowering within inflorescences is acropetallous. In the first season plants in the largest population produced approx. ten-fold more inflorescences than those in the smaller population and, although the number of flowers per inflorescence did not vary significantly between populations the first season, the larger population produced more fruit per inflorescence than the smaller population. However, fruit to flower ratios were less than 0·2 in both seasons and populations. In both populations the number of fruit was significantly greater at the proximal end of the inflorescence, where flowers open first, compared with medial and distal positions. Several bird species were observed visiting flowers, although few birds were recorded foraging at plants in the smaller population. Within both populations, birds tended to make more within- than between-plant visits. Self-compatibility, acropetally and proximal fruit-set, combined with the predominantly within-plant movement of honeyeaters, suggests inbreeding may be common within both populations of 'G. beadleana'. Pollination and fruiting success are discussed for 'G. beadleana' and breeding systems among rare and common taxa in Grevillea are reviewed.
Publication Type: Journal Article
Source of Publication: Annals of Botany, 89(13), p. 97-108
Publisher: Oxford University Press
Place of Publication: Oxford, United Kingdom
ISSN: 0305-7364
Field of Research (FOR): 050202 Conservation and Biodiversity
Socio-Economic Outcome Codes: 960802 Coastal and Estuarine Flora, Fauna and Biodiversity
Peer Reviewed: Yes
HERDC Category Description: C1 Refereed Article in a Scholarly Journal
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