Mistletoes increasing in eucalypt forest near Eden, New South Wales
R. J. Turner A C and Peter Smith B
+ Author Affiliations
- Author Affiliations
A 24 Hume Road, Lapstone, NSW 2773, Australia.
B 44 Hawkins Parade, Blaxland, NSW 2774, Australia.
C Corresponding author. Email: rj.turner@bigpond.com
Australian Journal of Botany 64(2) 171-179 https://doi.org/10.1071/BT15253
Submitted: 4 November 2015 Accepted: 25 February 2016 Published: 1 April 2016
Abstract
Mistletoe proliferation has contributed to eucalypt decline in rural lands in south-eastern Australia, but has seldom been recorded within forests. We report here on mistletoes increasing deep inside extensive eucalypt forest near Eden. Mistletoes (chiefly Amyema pendula (Sieber ex Spreng.) Tiegh., some Muellerina eucalyptoides (DC.) Barlow) were counted in 180 plots in various logging and burning treatments within a long-term experimental area. In 141.4 ha, there were 516 mistletoes in 1990–1991, and 1478 mistletoes in 2004–2006. The number of trees with mistletoes increased (doubling in logged coupes and almost tripling in unlogged coupes), and the number of mistletoes per tree increased (by ~30%). However, mistletoe prevalence remained low in 2004–2006 (2.7% of trees in logged coupes and 3.7% in unlogged coupes). Intensive logging limited the increase in mistletoe-bearing trees, probably because there were fewer trees available in logged coupes, but had no significant effect on the increase in mistletoes per tree. Low-intensity prescribed burns had no significant effect on mistletoe numbers, even with a high frequency of burning, probably because of their low scorch heights. We suggest that the observed increase in mistletoes in this forest, rather than indicating an ecological imbalance, is part of a natural cycle of boom and bust, with populations crashing in severe wildfires.
Additional keywords: Amyema pendula, Eucalyptus consideniana, fire ecology, logging.
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