Eur. J. Entomol. 102 (2): 195-200, 2005 | DOI: 10.14411/eje.2005.031

Fluctuating asymmetry as a measure of ecological stress in Drosophila melanogaster (Diptera: Drosophilidae)

Vincenzo TROTTA, Federico Corrado Fulceri CALBOLI, Flavio GAROIA, Daniela GRIFONI, Sandro CAVICCHI*
Dipartimento di Biologia Evoluzionistica Sperimentale, UniversitL di Bologna, via Selmi 3, 40126-Bologna, Italy

Fluctuating asymmetry (FA), the small and random departures from perfect symmetry of an organism's bilateral traits, has been used as a measurement of developmental stability and an indicator of stress in endangered populations. We were interested in testing if the level of developmental stability is the same in different populations experiencing the same conditions, as the use of FA as an indicator of ecological stress is only meaningful if this is true. In order to do this, the effect of thermal stress on wing size FA over a range of temperatures was determined on three different lines of Drosophila melanogaster: two lines were maintained at one of two different constant temperatures (18°C or 28°C) and one under a fluctuating thermal regime (18°C and 28°C) for eight years. The differences in viability of these lines, when reared at a range of different temperatures, are associated with the temperature conditions they previously experienced. All lines showed a similar increase in FA at the two ends of the thermal range but with significantly different mean values. The two units of wing development (compartments) differed in their FA response depending on the selective history of each line. We discuss the implication of our results for the use of FA as an indicator of ecological stress.

Keywords: Drosophila, fluctuating asymmetry, stress, viability, developmental compartments

Received: July 20, 2004; Revised: October 12, 2004; Accepted: November 26, 2004; Published: May 3, 2005  Show citation

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TROTTA, V., CALBOLI, F.C.F., GAROIA, F., GRIFONI, D., & CAVICCHI, S. (2005). Fluctuating asymmetry as a measure of ecological stress in Drosophila melanogaster (Diptera: Drosophilidae). EJE, 102(2), 195-200. doi: 10.14411/eje.2005.031
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