Le vendredi 6 mai, à 13h45, salle de conférences du Caren, campus de Beaulieu, UR1.
Le vendredi 6 mai, à 13h45
, salle de conférences du Caren, campus de Beaulieu, UR1.
Evolution of blood feeding: the Calyptra thalictri story
Sharon R. HILLa
, Jennifer ZASPELb
and Rickard IGNELLa
Division of Chemical Ecology, Department of Plant Protection Biology, Box 102, Swedish Agricultural University, Alnarp 230 53, Sweden
Department of Entomology, 219 Hodson Hall, 1980 Folwell Ave, University of Minnesota, St. Paul, MN 55108 USA and Bell Museum of Natural History, University of Minnesota, 10 Church Street, Minneapolis, MN 55455, USA
The mechanisms by which blood feeding in insects has evolved are unclear. The discovery of a subset of blood feeding male moths within a population in which the majority of Calyptra thalictri do not, provides a unique opportunity to investigate members of the same species for potential root mechanisms leading to the ability to blood feed.
Here we describe a dimorphism in the distribution of two antennal chemoreceptive sensillum types between individuals that took a blood meal under constrained experimental conditions and those that did not. The number of coeloconic and auricillic olfactory sensilla is reduced in C. thalictri
males that took a blood meal compared with those that did not. Physiological investigations of the sensilla coeloconica were found to respond to vertebrate-related volatiles, including ammonia.
The reduced number of olfactory sensilla that are sensitive to vertebrate-related compounds appears to be correlated with an increase in the likelihood of a male C. thalictri
to take a blood meal
Contact : Sharon HILL