Distribution of Phytophthora cinnamomi at different spatial scales: when can a negative result be considered positively?

Pryce, Josephine, Edwards, Will, and Gadek, Paul A. (2002) Distribution of Phytophthora cinnamomi at different spatial scales: when can a negative result be considered positively? Austral Ecology, 27 (4). pp. 459-462.

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Abstract

In October 1999, patches of dead and dying trees were identified in rainforest vegetation throughout the Tully Falls area in north Queensland, Australia. Previous incidents of patch death in the region had been attributed to Phytophthora cinnamomi. The distribution of P. cinnamomi was assessed by testing for its presence in seven sites displaying signs of dieback and seven sites that appeared healthy. Each site was a circular quadrat, 20-m radius (total area = 1256.6 m2). Within each quadrat, two perpendicular line transects were constructed. A single soil sample (250 g) was taken at the centre point and at 1-m intervals along each transect. All soil samples were tested for the presence of P. cinnamomi using a combination of lupin baiting, subsequent culturing and microscopic identification. Of the 1134 samples, 783 recorded positive responses. The mean number of positive responses was not significantly greater in patch death sites than in control sites, suggesting that at this scale of resolution the distribution of P. cinnamomi was uniform. However, at spatial scales of 1-m intervals across transects the distribution of P. cinnamomi was random.

Item ID: 13479
Item Type: Article (Refereed Research - C1)
Keywords: patch death; Phytophthora cinnamomi; spatial distribution; tropical rain forest
ISSN: 1442-9985
Date Deposited: 08 Dec 2010 06:29
FoR Codes: 06 BIOLOGICAL SCIENCES > 0699 Other Biological Sciences > 069999 Biological Sciences not elsewhere classified @ 100%
SEO Codes: 96 ENVIRONMENT > 9608 Flora, Fauna and Biodiversity > 960806 Forest and Woodlands Flora, Fauna and Biodiversity @ 100%
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