Horizon 1 1 17 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES Medical and Veterinary Entomology 447-454 Anopheles gambiae emergence nutritional reserves ovarian development size-corrected weight trade-offs 2012 fdi:010058202 ENG Medical and Veterinary Entomology 0269-283X ISI:000312081800010 4 10.1111/j.1365-2915.2012.01018.x https://www.documentation.ird.fr/hor/fdi:010058202 https://www.documentation.ird.fr/intranet/publi/2012/12/010058202.pdf 26 Horizon (IRD) In West Africa, M and S molecular forms of Anopheles gambiae sensu stricto (Diptera: Culicidae) Giles, frequently occur together, although with different population bionomics. The S form typically breeds in rain-dependant water collections and is present during the rainy season only whereas the M form can thrive all year long in areas with permanent breeding opportunities. In the present study, we explored physiological and developmental trade-offs at play in laboratory colonies and field populations of the M and S forms that originated from an area of sympatry in Burkina Faso, where M and S larvae exhibit such habitat segregation. In the laboratory, larvae of the M form developed slower than the S form (mean values 9.51 and 8.85 days, respectively, Wilcoxon's test, P < 0.001). Although wing length and dry weight at emergence showed large variations, M females were on average 8% heavier than S females of similar wing length. Higher nutritional reserves (proteins and lipids) in teneral adults explained part of this weight difference, reflecting a better ability of the M form to garner resources at the larval stage. Furthermore, a higher rate of ovarian maturation was observed in the M form after a single bloodmeal. The relevance of these findings for parasite transmission is discussed. 052 UR224 Burkina Faso