Department of Life Sciences seminar
Insect diversity and pest control in the anthropogenic habitats of NE China
Department of Geography, University College London
Friday 7 December 11:00
Sir Neil Chalmers seminar room, Darwin Centre LG16 (below Attenborough studio)
The natural environment of NE China has been altered by humans for thousands of years. Nonetheless, both intensity and spatial extend of these alterations have greatly increased since the middle of the last century. Agricultural production was greatly intensified, while the remaining natural forest cover was widely cleared. The severe environmental degradation which followed has led to an increased awareness of the importance of environmental issues in the last few decades, with re- and afforestation projects being currently established throughout China at an unprecedented scale. At the same time, agricultural practices following the maxim ‘the more, the better’ are also increasingly questioned, with the importance of biological pest control recognized as a potential cheap and less environmentally detrimental alternative to chemical pesticides.
Given these recent developments, I have started a number of collaborative research projects with the Chinese Agricultural University and the Institute of Botany, Chinese Academy of Sciences to investigate diversity and species composition of ground beetle assemblages in reforested habitats and the agricultural landscapes of the Hebei province, looking at both the diversity and potential pest control function of these mostly predatory beetles. Our research shows that the diversity of ground beetles varies strongly between different types of forest ecosystems, with naturally regenerating birch forests and open larch plantations showing a high abundance, but low diversity in carabids. Plantations of native oak and pine monocultures, as well as forests composed of a mixture of planted and naturally regenerating trees harbour distinctly higher diversity levels.
In the agricultural landscape, even very intensively managed double-cropping systems comprising of summer maize and winter wheat monocultures can support surprisingly high levels of ground beetle diversity, while cotton monocultures were found to harbour distinctly lower levels of carabid diversity. Landscape elements like the diversity of land-use types were found to have only a limited effect on the diversity of the ground beetle community at least in some of our study areas. A comparison of diversity patterns in ground beetles and geometrid moths finally showed that links between these highly diverse herbivore and insectivore taxa are highly complex, with distinctly different spatial patterns observed in these two families.
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