Evol Ecol Res 3: 441-447 (2001)     Full PDF if your library subscribes.

Developmental instability in sexually reproducing and parthenogenetic populations of Bacillus rossius rossius and Bacillus rossius redtenbacheri

C. Pertoldi,1 V. Scali2 and V. Loeschcke1

1Department of Ecology and Genetics, University of Aarhus, Ny Munkegade, Building 540, DK-8000 Aarhus, Denmark and 2Dipartimento di Biologia Evoluzionistica Sperimentale, Via Selmi 3, 40126 Bologna, Italy

Address all correspondence to C. Pertoldi, Department of Landscape Ecology, National Environmental Research Institute, Kalø Grenåvej 14, DK-8410 Rønde, Denmark.
e-mail: cpb@dmu.dk


Developmental instability, estimated by fluctuating asymmetry and morphological variance, was investigated in sexually reproducing and parthenogenetic populations of Bacillus rossius rossius and Bacillus rossius redtenbacheri. Fluctuating asymmetry was significantly higher in parthenogenetic females than amphigonic females in both sub-species. It was also higher in males and parthenogenetic females of the sub-species redtenbacheri than in males and parthenogenetic females of the sub-species rossius. When we compared fluctuating asymmetry between males and females in amphigonic populations within each sub-species, we found no significant differences with one exception: the antenna showed higher fluctuating asymmetry in males than in females in both sub-species. There was a higher morphological variance in parthenogenetic females of the sub-species rossius than in parthenogenetic females of the sub-species redtenbacheri, whereas no significant differences were found between the amphigonic females of the two sub-species. In both sub-species, there was evidence for higher morphological variance in amphigonic than parthenogenetic females. When Lerner’s conjecture was tested, fluctuating asymmetry was not significantly higher in individuals with a body size more than one standard deviation from the mean of the size distribution.

Keywords: amphigonic reproduction, developmental instability, fluctuating asymmetry, parthenogenetic reproduction.

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