CSIRO Publishing blank image blank image blank image blank imageBooksblank image blank image blank image blank imageJournalsblank image blank image blank image blank imageAbout Usblank image blank image blank image blank imageShopping Cartblank image blank image blank image You are here: Journals > Australian Journal of Botany   
Australian Journal of Botany
Journal Banner
  Southern Hemisphere Botanical Ecosystems
blank image Search
blank image blank image
blank image
  Advanced Search

Journal Home
About the Journal
Editorial Structure
Online Early
Current Issue
Just Accepted
All Issues
Special Issues
Turner Review Series
Sample Issue
For Authors
General Information
Submit Article
Author Instructions
Open Access
Awards and Prizes
For Referees
Referee Guidelines
Review an Article
Annual Referee Index
For Subscribers
Subscription Prices
Customer Service
Print Publication Dates

blue arrow e-Alerts
blank image
Subscribe to our Email Alert or RSS feeds for the latest journal papers.

red arrow Connect with us
blank image
facebook twitter LinkedIn

red arrow PrometheusWiki
blank image
Protocols in ecological and environmental plant physiology


Article << Previous     |         Contents Vol 29(5)

Bird Pollination and the Mating System of Eucalyptus Stoatei.

SD Hopper and GF Moran

Australian Journal of Botany 29(5) 625 - 638
Published: 1981


Eucalyptus stoatei C. A. Gardn., a small tree endemic in south-western Australia, is unusual in the genus in being predominantly if not exclusively pollinated by birds. Many individual honeyeaters but no insects were recorded feeding on its nectar during the 1980 flowering season. The large pendulous flowers deny entry to most large insect visitors because the stamens form an impenetrable dome over the floral cup. Access to nectar is only possible through a narrow opening lined with anthers in the centre of the staminal dome. Honeyeaters visited few flowers per tree (average 1-5) and about 18% of the movements of individual birds from one flower to another were between flowers on different trees. Most intertree movements were between trees farther apart than nearest-neighbours. Hence a high rate of outcross pollination is inferred. Analysis of the mating system of E. stoatei using allozyme seed markers in one population indicated an average level of outcrossing of 82%, among the highest so far recorded for eucalypts. The study therefore supports the hypothesis that bird pollinators may effect high levels of outcrossing, although other factors such as protandry and incompatibility probably are also involved. Adaptations favouring exclusive bird pollination in E. stoatei may have evolved to promote outcrossing and heterozygosity in the face of inbreeding depression imposed by a dissected population structure. and in response to the relatively low number of seeds per plant produced by the species.

Full text doi:10.1071/BT9810625

© CSIRO 1981

blank image
Subscriber Login

PDF (723 KB) $25
 Export Citation
Legal & Privacy | Contact Us | Help


© CSIRO 1996-2015