Fig. 2From: The emergence of ecotypes in a parasitoid wasp: a case of incipient sympatric speciation in Hymenoptera?Number of strains of Nasonia vitripennis with significant reaction to the odour of bird nests and carrion in olfactometer experiments. Wasp strains originate from bird nests (yellow) or next to carrion (blue). For each strain about 20 wasps were tested. Coloured parts of the bars refer to the number of reacting strainsBack to article page