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Practical and theoretical implications of a browsing cascade in Tasmanian forest and woodland


Hazeldine, A and Kirkpatrick, JB, Practical and theoretical implications of a browsing cascade in Tasmanian forest and woodland, Australian Journal of Botany, 63, (5) pp. 435-443. ISSN 0067-1924 (2015) [Refereed Article]

Copyright Statement

Journal compilation Copyright CSIRO 2015

DOI: doi:10.1071/BT14334


Browsing cascades have strong implications for biodiversity conservation and fire management. The associational resistance and associational susceptibility hypotheses suggest different mechanisms. We tested the veracity of these two hypotheses by using small dry eucalypt forest and woodland trees. At 67 sites, we measured the height of the browse line and estimated the proportion of foliage remaining below it for all adult individuals of small trees within a 50נ50m area, recorded scat numbers, browsing damage to tree seedlings by species and environmental data. The 110130-cm browse line, and strong relationships between macropod scat numbers and the remaining foliage below the browse line, suggested that Bennetts wallabies (Macropus rufogriseus Shaw) were the main cause of umbrella-shaped trees. The browsers preferred Exocarpos cupressiformis Labill. and Bursaria spinosa Cav. At the other extreme, adult Acacia dealbata Link suffered no browsing damage. All species were browsed as seedlings. Associational resistance occurred in some species and associational susceptibility in others, with the degree of difference in palatability between alternative sources of browse possibly resolving this apparent contradiction. Low browsing pressure is likely to cause woody thickening, an increase in fire hazard and a decrease in biodiversity. Extremely high browsing pressure had no such effects.

Item Details

Item Type:Refereed Article
Keywords:browsing, macropods, small trees, associational resistance, associational susceptibility, eucalypt, macropod, rabbit, small trees, wombat
Research Division:Biological Sciences
Research Group:Ecology
Research Field:Terrestrial ecology
Objective Division:Environmental Management
Objective Group:Other environmental management
Objective Field:Other environmental management not elsewhere classified
UTAS Author:Hazeldine, A (Mr Alister Hazeldine)
UTAS Author:Kirkpatrick, JB (Professor James Kirkpatrick)
ID Code:105886
Year Published:2015
Web of Science® Times Cited:12
Deposited By:Geography and Environmental Studies
Deposited On:2016-01-19
Last Modified:2017-11-03

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