Threshold effect of eucalypt density on an aggressive avian competitor

Article


Maron, Martine. 2007. "Threshold effect of eucalypt density on an aggressive avian competitor." Biological Conservation. 136 (1), pp. 100-107. https://doi.org/10.1016/j.biocon.2006.11.007
Article Title

Threshold effect of eucalypt density on an aggressive avian competitor

ERA Journal ID3211
Article CategoryArticle
Authors
AuthorMaron, Martine
Journal TitleBiological Conservation
Journal Citation136 (1), pp. 100-107
Number of Pages8
Year2007
Place of PublicationAmsterdam, Netherlands
ISSN0006-3207
1873-2917
Digital Object Identifier (DOI)https://doi.org/10.1016/j.biocon.2006.11.007
Web Address (URL)https://www.sciencedirect.com/science/article/pii/S0006320706005052
Abstract

General guidelines available to revegetation planners focus on the spatial context and dimensions of the revegetated site. However, site-specific habitat factors can have overarching importance for habitat value, especially where interactions with competitors or predators may play an important role. Current revegetation projects in Australia which aim to restore slow-growing buloke (Allocasuarina luehmannii) woodland, a threatened habitat important for bird conservation, usually include faster-growing eucalypts in plantings. This research aimed to identify whether eucalypt presence in buloke woodland facilitates invasion by the noisy miner (Manorina melanocephala), an aggressive competitor that is absent from pure buloke woodland. Birds were surveyed in buloke woodland remnants that contained eucalypts as a sub-dominant species at densities of 0-16 per ha. The probability of noisy miner presence in buloke woodland increased markedly where eucalypts were present at a density of approximately five per hectare. The presence of noisy miners resulted in a substantial difference in bird assemblage structure and composition. Small-bodied insectivorous birds which are experiencing population declines in southern Australia were recorded on average six times more often in transects without noisy miners (low-eucalypt density transects). Avian behaviour and habitat use was also altered, with birds flying more frequently in transects where noisy miners were present. A minor difference in habitat composition results in substantial degradation of the conservation value of non-eucalypt woodland in eastern Australia due to invasion by aggressive avian competitors. Revegetation and restoration practices should take into account the potential for such subtle floristic differences to result in substantial variation in conservation outcomes.

Keywordshabitat composition; habitat use; interspecific competition; noisy miners; woodland birds; evergreen tree; invasive species; passerine; restoration ecology; revegetation; species conservation; threshold
ANZSRC Field of Research 2020410202. Biosecurity science and invasive species ecology
300707. Forestry management and environment
410401. Conservation and biodiversity
Public Notes

Erratum to: 'Threshold effect of eucalypt density on an aggressive avian competitor' [Biol. Conserv. 136 (2007) 100–107]
IN : Biological Conservation, Volume 140, Issues 1-2, November 2007, Page 194, doi:10.1016/j.biocon.2007.08.002

Byline AffiliationsAustralian Centre for Sustainable Catchments
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https://research.usq.edu.au/item/9y033/threshold-effect-of-eucalypt-density-on-an-aggressive-avian-competitor

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