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How does ontogeny in a Eucalyptus species affect patterns of herbivory by Brushtail Possums?

Citation

Loney, PE and McArthur, C and Potts, BM and Jordan, GJ, How does ontogeny in a Eucalyptus species affect patterns of herbivory by Brushtail Possums?, Functional Ecology, 20, (6) pp. 982-988. ISSN 0269-8463 (2006) [Refereed Article]

DOI: doi:10.1111/j.1365-2435.2006.01193.x

Abstract

1. Comparisons of adult and juvenile plant stages are often confounded by other factors such as differences in height between plants. However, these factors can be teased apart using common garden experiments and appropriate sampling designs. 2. Using paired sampling of upper and lower canopies of Eucalyptus nitens trees, which were growing in a common environment trial and only one of which had undergone the transition to adult foliage, this study assessed the effects of ontogeny and canopy position on the feeding preferences of Common Brushtail Possums (Trichosurus vulpecula) in captive feeding trials under choice conditions. 3. Possums preferred juvenile foliage over adult foliage. In contrast, canopy position did not influence preferences. 4 Adult foliage contained significantly less sideroxylonals (a compound known to deter herbivory by Brushtail Possums), but was significantly tougher (with thicker cuticle, more fibre, more lignin and a higher percentage dry mass) than juvenile foliage, suggesting that leaf toughness was more significant than defensive chemistry in influencing intake by possums. Adult foliage did not differ significantly from juvenile foliage in nitrogen, total phenolics or essential oil concentration. 5. Greater resistance to herbivory of adult foliage compared with juvenile foliage by a significant browser of eucalypt tree foliage could contribute to selection for an earlier change from juvenile to adult foliage in areas that are heavily browsed by possums. © 2006 The Authors.

Item Details

Item Type:Refereed Article
Research Division:Biological Sciences
Research Group:Ecology
Research Field:Terrestrial Ecology
Objective Division:Plant Production and Plant Primary Products
Objective Group:Forestry
Objective Field:Hardwood Plantations
Author:Loney, PE (Dr Prue Loney)
Author:Potts, BM (Professor Brad Potts)
Author:Jordan, GJ (Associate Professor Greg Jordan)
ID Code:41650
Year Published:2006
Web of Science® Times Cited:27
Deposited By:Plant Science
Deposited On:2006-08-01
Last Modified:2009-07-31
Downloads:0

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