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Research finds climate warming could spell increase in pests but not their predators

Climate-warming affects farmlands by increasing pests but not their natural predators, resulting in reduced crop yields, according to new research carried out at Newcastle University.


Marianne   Curtis

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Marianne   Curtis
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The study, published in the journal, Molecular Ecology, provides the first experimental evidence of how the interactions between agricultural plants, greenflies and tiny parasitoid wasps are affected in a world where temperatures are increased by 1.4degC.

 

Scientists at Newcastle University and the University of Hull have also shown that a rise in temperature drives changes in the crop, altering the growing patterns of the wheat, which produced fewer, lighter seeds.

 

Dr Darren Evans, reader in ecology and conservation at Newcastle University, and the leader of the study, says: “There have been a number of recent high-profile studies that have modelled the long-term effects of climate-change on crops using computers, but there are surprisingly few studies that have tested this using field experiments on farms.

 

“Most models examine the impacts on crop yields, but often fail to take into account that crops are embedded in a wider network of interactions with organisms that can also directly and indirectly impact upon the crop as a result of climate-change.

 

“We used a network approach to better understand the impact on the farmland food-web.”

 

By simulating a warmer, wetter environment, the team suspended infrared heaters above a wheat crop in Yorkshire, whilst also managing rainwater and found significant changes to the food-web – a system of interlocking and interdependent food chains.

 

In order to study the network of species interactions, the team developed a DNA-based tool to rapidly identify greenflies collected in the field, enabling them to see whether they had been parasitised as well as the identity of the natural predator using the DNA of its eggs, which it injects into the insects.


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Green flies

 

Dr Evans said: “In the first year of the experiment, we found that climate-warming affected the structure and complexity of the species-interaction networks.

 

“Some species where more affected than others but we observed four times as many green flies in the warmed plots compared to the controls.

 

“Although it must be stressed that our experimental plots were not managed in a way similar to conventional wheat crops, and the study was based on a single growing season, our results support growing evidence that climate-change will increase pests and pathogens and reduce crop yields in some temperate agro-ecosystems.”

 

The scientists found no effect of adding extra rainwater, despite the year of study being unseasonably dry, suggesting that increased irrigation by farmers may not mitigate the effects of climate-warming.

 

They are now examining subsequent years’ data to understand variation across growing seasons and plan to include a wider range of above and below-ground organisms in the networks.

Dr Evans added: “New approaches in network ecology, combined with DNA-based tools, could help us to better understand and mitigate adverse effects of climate-warming through targeted management of non-crop plants, farm habitats and natural predators.

 

“Further work must include other important factors, such as increases in carbon dioxide, if we are going to make experiments and models more predictive. Ideally projects such as these should be replicated beyond a single experimental farm to incorporate wider geographical areas and a diversity of agro-ecosystems.”

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