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Detection of delayed density dependence in an orchid population

Gillman, M. P. and Dodd, M. (2000). Detection of delayed density dependence in an orchid population. Journal of Ecology, 88(2) pp. 204–212.

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1 Annual censuses of Orchis morio (green-winged orchid) flowering spikes have been taken over a 27-year period in a replicated factorial experiment on the effects of fertilizer application. Census data, combined by block or treatment, were used in time-series analyses to test for density dependence. 2 Partial autocorrelation functions revealed the importance of positive correlations at lag 1 and negative correlations at lag 5. Stepwise multiple regressions provided evidence of delayed density dependence, again with a delay of about 5 years, with no evidence of direct (first-order) density dependence. 3 First-order autocorrelations and delayed density dependence were considered in the light of the known stage structure and generation time of the plant and the possibility of density dependence at different points in the life history. 4 Model structure affects the detection of density dependence, increasing the propensity for type I errors.

Item Type: Journal Item
Copyright Holders: 2000 British Ecological Society
ISSN: 0022-0477
Keywords: Orchis morio; population dynamics; time-series
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Environment, Earth and Ecosystem Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Research Group: OpenSpace Research Centre (OSRC)
Item ID: 27586
Depositing User: Michael Dodd
Date Deposited: 22 Mar 2011 13:42
Last Modified: 07 Dec 2018 09:51
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