Chemical defence in a sawfly: genetic components of variation in relevant life-history traits

Heredity
Caroline MüllerP M Brakefield

Abstract

Larvae of several tenthredinid sawfly species readily release droplets of haemolymph through their integument when attacked by predators. This defence mechanism via 'bleeding' is characterised by a low integument resistance and a high haemolymph deterrence. Both traits are variable, and negatively correlated among species. We sought to determine if such differences in the propensity to bleed also occur intraspecifically by studying the heritability of traits potentially associated with the bleeding phenomenon in the turnip sawfly Athalia rosae ruficornis Jakovlev (Hymenoptera: Tenthredinidae, Allantinae). For three European populations, heritabilities were estimated in the laboratory in a parent-offspring and a full-sib design for haemolymph deterrence (measured as concentration of sequestered glucosinolate), integument resistance, body mass of eonymph and adult, and developmental time. Within A. rosae, no significant negative phenotypic correlation was found between the two traits directly related to the defence mechanism: integument resistance and haemolymph deterrence. However, the significant heritabilities found for these traits in the full-sib analysis (0.39 and 0.35, respectively, for males in the Swiss population) show ...Continue Reading

References

Jul 28, 2001·Evolution; International Journal of Organic Evolution·D H Reed, R Frankham
Jan 5, 2002·Evolution; International Journal of Organic Evolution·A KauseK Ruohomäki
Jan 16, 2002·Journal of Chemical Ecology·C MüllerP M Brakefield
Aug 1, 1992·Journal of Chemical Ecology·F Eggenberger, M Rowell-Rahier
May 1, 2002·Oecologia·Klaus FischerPaul M Brakefield
Aug 1, 1993·Evolution; International Journal of Organic Evolution·Graham J HollowayMart Ottenheim
Oct 1, 1996·Evolution; International Journal of Organic Evolution·Dolph Schluter
Oct 1, 1996·Evolution; International Journal of Organic Evolution·Ilik J SaccheriRichard A Nichols

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Citations

May 1, 2012·Biological Reviews of the Cambridge Philosophical Society·Michael P SpeedThomas N Sherratt
Apr 1, 2008·Evolution; International Journal of Organic Evolution·James A Fordyce, Chris C Nice
Aug 17, 2005·Insect Biochemistry and Molecular Biology·Caroline Müller, Ute Wittstock

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