|Appears in Collections:||Biological and Environmental Sciences Journal Articles|
|Peer Review Status:||Refereed|
|Title:||Reproductive biology of Corymbia citriodora subsp. variegata and effective pollination across its native range in Queensland, Australia|
Lee, David J
Schenk, Peer M
Lowe, Andrew J
|Keywords:||contemporary gene flow|
|Citation:||Bacles C, Brooks J, Lee DJ, Schenk PM, Lowe AJ & Kremer A (2009) Reproductive biology of Corymbia citriodora subsp. variegata and effective pollination across its native range in Queensland, Australia. Southern Forests: A Journal of Forest Science, 71 (2), pp. 125-132. http://www.nisc.co.za/oneAbstract?absId=3120; https://doi.org/10.2989/SF.2009.71.2.7.822|
|Abstract:||The spotted gum species complex represent a group of four eucalypt hardwoods which have a native range that spans down the east coast of Australia, with a morphological cline from Victoria to northern Queensland. Of this group, Corymbia citriodora subsp. variegata (CCV), is widespread in southeast Queensland and northern New South Wales. It is currently the most commonly harvested native hardwood in Queensland. However, little basic knowledge of the reproductive biology of the species is available to inform genetic improvement and resource management programmes. Here we take an integrative approach, using both field and molecular data, to identify ecological factors important to mating patterns in native populations of CCV. Field observation of pollinator visitation and flowering phenology of 20 trees shows that foraging behaviour of pollinator guilds varies depending on flowering phenology and canopy structure. A positive effect of tree mean flowering effort was found on insect visitation, while bat visitation was predicted by tree height and by the number of trees simultaneously bearing flowers. Moreover, introduced honeybees were observed frequently, performing 73% of detected flower visits. Conversely, nectar-feeding birds and mammals were observed sporadically with lorikeets and honeyeaters each contributing to 11% of visits. Fruit bats, represented solely by the grey-headed flying fox, performed less than 2% of visits. Genotyping at six microsatellite markers in 301 seeds from 17 families sampled from four of Queensland’s native forests shows that CCV displays a mixed-mating system which is mostly outcrossing (tm=0.899±0.021). Preferential effective pollination from near-neighbours was detected by means of maximum-likelihood paternity analysis with up to sixteen percent of reproduction events resulting from selfing. Forty to forty-eight percent of fertilising pollen was also carried from longer distance (> 60m). Marked differences in foraging behaviour and visitation frequency between observed pollinator guilds suggests that the observed dichotomy of effective pollen movement in spotted gums may be due to frequent visit from introduced honeybees favouring geitonogamy and sporadic visits from honeyeaters and fruit bats resulting in potential long-distance pollinations.|
|Rights:||The publisher has not responded to our queries therefore this work cannot be made publicly available in this Repository. Please use the Request a Copy feature at the foot of the Repository record to request a copy directly from the author; you can only request a copy if you wish to use this work for your own research or private study.|
|Baclesetal_2009_SouthernForests71_125_132.pdf||Fulltext - Accepted Version||150.27 kB||Adobe PDF||Under Embargo until 3000-12-01 Request a copy|
Note: If any of the files in this item are currently embargoed, you can request a copy directly from the author by clicking the padlock icon above. However, this facility is dependent on the depositor still being contactable at their original email address.
This item is protected by original copyright
Items in the Repository are protected by copyright, with all rights reserved, unless otherwise indicated.
The metadata of the records in the Repository are available under the CC0 public domain dedication: No Rights Reserved https://creativecommons.org/publicdomain/zero/1.0/
If you believe that any material held in STORRE infringes copyright, please contact email@example.com providing details and we will remove the Work from public display in STORRE and investigate your claim.