Weakening density dependence from climate change and agricultural intensification triggers pest outbreaks : a 37-year observation of cotton bollworms

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dc.contributor.authorOuyang, Fangen_ZA
dc.contributor.authorHui, Cangen_ZA
dc.contributor.authorMen, Xin-Yuanen_ZA
dc.contributor.authorZhao, Zi-Huaen_ZA
dc.contributor.authorShi, Pei-Jianen_ZA
dc.contributor.authorZhang, Yong-Shengen_ZA
dc.contributor.authorLi, Bai-Lianen_ZA
dc.date.accessioned2015-12-07T06:52:58Z
dc.date.available2015-12-07T06:52:58Z
dc.date.issued2014-08-12
dc.descriptionCITATION: Ouyang, F. et al. 2014. Weakening density dependence from climate change and agricultural intensification triggers pest outbreaks : a 37-year observation of cotton bollworms. Ecology and Evolution, 4(17):3362–3374, doi:10.1002/ece3.1190.en_ZA
dc.descriptionThe original publication is available at http://onlinelibrary.wiley.comen_ZA
dc.description.abstractUnderstanding drivers of population fluctuation, especially for agricultural pests, is central to the provision of agro-ecosystem services. Here, we examine the role of endogenous density dependence and exogenous factors of climate and human activity in regulating the 37-year population dynamics of an important agricultural insect pest, the cotton bollworm (Helicoverpa armigera), in North China from 1975 to 2011. Quantitative time-series analysis provided strong evidence explaining long-term population dynamics of the cotton bollworm and its driving factors. Rising temperature and declining rainfall exacerbated the effect of agricultural intensification on continuously weakening the negative density dependence in regulating the population dynamics of cotton bollworms. Consequently, ongoing climate change and agricultural intensification unleashed the tightly regulated pest population and triggered the regional outbreak of H. armigera in 1992. Although the negative density dependence can effectively regulate the population change rate to fluctuate around zero at stable equilibrium levels before and after outbreak in the 1992, the population equilibrium jumped to a higher density level with apparently larger amplitudes after the outbreak. The results highlight the possibility for exogenous factors to induce pest outbreaks and alter the population regulating mechanism of negative density dependence and, thus, the stable equilibrium of the pest population, often to a higher level, posing considerable risks to the provision of agroecosystem services and regional food security. Efficient and timely measures of pest management in the era of Anthropocene should target the strengthening and revival of weakening density dependence caused by climate change and human activities.en_ZA
dc.description.urihttp://onlinelibrary.wiley.com/doi/10.1002/ece3.1190/abstract
dc.description.versionPublisher's versionen_ZA
dc.format.extent13 pages : illustrations, mapsen_ZA
dc.identifier.citationOuyang, F. et al. 2014. Weakening density dependence from climate change and agricultural intensification triggers pest outbreaks : a 37-year observation of cotton bollworms. Ecology and Evolution, 4(17):3362–3374, doi:10.1002/ece3.1190.en_ZA
dc.identifier.issn2045-7758 (online)
dc.identifier.otherdoi:10.1002/ece3.1190
dc.identifier.urihttp://hdl.handle.net/10019.1/97662
dc.language.isoen_ZAen_ZA
dc.publisherJohn Wiley & Sons Ltd.en_ZA
dc.rights.holderAuthors retain copyrighten_ZA
dc.subjectClimate changeen_ZA
dc.subjectDensity dependenceen_ZA
dc.subjectCotton bollwormsen_ZA
dc.titleWeakening density dependence from climate change and agricultural intensification triggers pest outbreaks : a 37-year observation of cotton bollwormsen_ZA
dc.typeArticleen_ZA
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