Parasitoids induce production of the dispersal morph of the pea aphid, Acyrthosiphon pisum

By J. J. Sloggett, W. Weisser. 2002

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Endocrine Control of Insect Polyphenism (2012, background): “…parasitization by Aphidius pisum caused apterization and other correlated changes in body shape (ChristiansenWeniger and Hardie, 2000), yet parasitization of the same species by Aphidius ervi had the opposite effect, resulting in a higher proportion of winged offspring (Sloggett and Weisser, 2002).”
Alarm pheromone mediates production of winged dispersal morphs in aphids (2005, unknown): “Recently, it was found that in the presence of natural enemies pea aphids ( Acyrthosiphon pisum ) increase the proportion of winged morphs among their offspring (Dixon & Agarwala 1999; Weisser et al. 1999; Sloggett & Weisser 2002; Kunert & Weisser 2003).”
Causes and consequences of animal dispersal strategies: relating individual behaviour to spatial dynamics (2005, background): “Experimental work with the pea aphid, Acyrthosiphon pisum, found that alate (winged morph) production could be induced by the presence of a predator such as a ladybird (Sloggett & Weisser, 2002).”