1. Abrams PA (1995) Implications of dynamically variable traits for identifying, classifying, and measuring direct and indirect effects in ecological communities. Am Nat 146:112–134
2. Addicott JF (1978) The population dynamics of aphids on fireweed: a comparison of local populations and metapopulations. Can J Zool 56:2554–2564
3. Adler FR, Grunbaum D (1999) Evolution of forager responses to inducible defenses. In: Tollrian R, Harvell CD (eds) The ecology and evolution of inducible defenses. Princeton University Press, Princeton, N.J., pp 259–285
4. Bänsch R (1964) Vergleichende Untersuchungen zur Biologie und zum Beutefangverhalten aphidivorer Coccinelliden, Chrysopiden und Syrphiden. Zool Jb Syst 91:271–340
5. Chambers RJ (1988) Syrphidae. In: Minks AK, Harrewijn P (eds) Aphids, their biology, natural enemies and control, vol B. Elsevier, Amsterdam, pp 259–270