Prey-Mediated Effects of Drought on the Consumption Rates of Coccinellid Predators of Elatobium abietinum

@article{BanfieldZanin2016PreyMediatedEO,
  title={Prey-Mediated Effects of Drought on the Consumption Rates of Coccinellid Predators of Elatobium abietinum},
  author={Jennifer A. Banfield-Zanin and Simon R. Leather},
  journal={Insects},
  year={2016},
  volume={7}
}
Climate change in the UK is predicted to cause an increase in summer drought events. Elatobium abietinum is an important pest of Sitka spruce (Picea sitchensis), causing defoliation of trees, and is predicted to become more abundant in response to climatic change, reducing spruce productivity. Populations are also moderated by invertebrate predators, though the extent to which this might be modified under a changing climate is unclear. Elatobium abietinum is preyed upon by the coccinellid… 
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TLDR
Drought stress has the potential to alter E. abietinum population densities, structure and phenology in Sitka spruce plantations, with implications for forest management, damage levels and natural control of the aphid under future altered climate.
Drought intensity and frequency have contrasting effects on development time and survival of the green spruce aphid
TLDR
It is suggested that, under severe water deficit, populations of E. abietinum may be reduced as a result of a reduced period of time available for reproduction and, consequently, damage levels and growth reductions of host Sitka spruce under altered climatic conditions.
Frequency and intensity of drought stress alters the population size and dynamics of Elatobium abietinum on Sitka spruce
TLDR
Aphid infestation significantly increased percentage needle loss under all drought treatments, although no differences were observed between drought levels, and the implications for damage to host Sitka spruce are of relevance to forest management strategies, as an increase in drought events are predicted in the UK.
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TLDR
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TLDR
Aphidecta obliterata as adults on Sitka spruce sections consumed significantly higher numbers of aphids than their counterparts on Norway spruce, and Adalia bipunctata adults were found in significantly lower numbers in the NorwaySpruce chamber than the control chamber.
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TLDR
Changes to summer rainfall, due to climate change, may therefore reduce the occurrence of plant-mediated interactions between insect herbivores.
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TLDR
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TLDR
A. obliterata was the main coccinellid species feeding on both E. abietinum on Sitka spruce and A. cooleyi on Douglas fir during the pre‐diapausal imaginal period, indicating the necessity to conserve energy during the absence of prey in summer.
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TLDR
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TLDR
The potential for sporadic climate change events, such as summer drought, to be disruptive to herbivore–antagonist interactions is demonstrated.
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