Le vendredi 2 octobre 2015 à 13h00, salle de l'UFR SVE, bâtiment 13, Campus de Beaulieu, UR1
Le vendredi 2 octobre 2015 à 13h00
, salle de l'UFR SVE, bâtiment 13, Campus de Beaulieu, UR1Physiological thermotolerance and behavioural thermoregulation in aphids and their natural enemiesAbstract :
The earth is presently experiencing rapid changes in both climatic conditions and landscape structure. Over the past century the climate has warmed by approximately 0.6°C and the incidence of extreme climatic events such as droughts and heat and cold waves has increased. In addition to climatic changes, much of Europe has experienced large scale intensification over the past 50 years. This intensification has led to a considerable increase in agricultural productivity but also to a simplification of agricultural landscapes, a loss of biodiversity and a degradation of ecosystem services.
My recent research aimed to investigate the effects of landscape intensification on the thermal biology of a pest insect (the cereal aphids) and their natural enemies (the carabid beetles and the parasitoid wasps) to better understand how landscape and climate may interact to affect the abundance of pest species in the face of global climate change. Cereal aphids and their natural enemies were sampled along a landscape intensification gradient in North-West France, with sample fields ranging from more complex ‘bocage’ landscapes to simpler, intensively farmed landscapes. A series of laboratory experiments were performed to investigate the inherent physiological thermotolerance and behavioural thermoregulation of the test insects to determine potential effects of landscape intensification and climate on these important insects, and the relative importance of behavioural and physiological thermal tolerance.
Contact : Lucy ALFORD