IBBEA   24401
INSTITUTO DE BIODIVERSIDAD Y BIOLOGIA EXPERIMENTAL Y APLICADA
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Temperate but not tropical Drosophila species maintain high fertility after long-term cold exposure: evidence for reproductive diapause?
Autor/es:
JULIAN MENSCH; JUAN HURTADO; PAULA ZERMOGLIO; GERARDO JOSÉ DE LA VEGA; CARMEN ROLANDI; PABLO E. SCHILMAN; THERESE MARKOW; ESTEBAN HASSON
Reunión:
Simposio; 6th International Symposium on the Environmental Physiology of Ectotherms and Plants (ISEPEP6); 2015
Resumen:
Diapause consists of a distinct physiological state characterized by arresteddevelopment, enhanced stress resistance and metabolic changes in response tounfavorable environmental conditions. Although a wide variety of animals exhibit suchadaptive phenotypic plasticity across seasons it is not clear to what extent the geneticand environmental mechanisms underlying diapause are conserved across insect taxa.We initially determined and compared the environmental conditions for cold-inducedarrest of reproduction in four closely related fly species, two temperate and two tropicalcactophilic South American Drosophila. Subsequently, we established that only the twotemperate species appear to experience winter conditions require for arrest ofmaturation. Based on these findings, we predicted that only temperate species wouldshow adaptations in terms of energy metabolism, cold tolerance and fitness after longtermcold exposure, as they are the only ones that evolved the capacity to undergoreproductive diapause. Our comparative study revealed both shared and distinct featuresbetween tropical and temperate species subjected to long-term cold exposure. On onehand, we found similar energy metabolism across species during cold exposure. On theother hand, not only were temperate species more fertile and fecund after cold exposure,but their cold tolerance also was superior. These findings highlight the role of thermalinducedreproductive plasticity as an integrated mechanism of cold adaptation intemperate South American Drosophila.