Portal de Periódicos da CAPES

Stress and asymmetry during arrested development of the Australian sheep blowfly

1997; Royal Society; Volume: 264; Issue: 1389 Linguagem: Inglês

10.1098/rspb.1997.0242

1471-2954

John A. McKenzie,

Insect and Arachnid Ecology and Behavior

The dieldrin and diazinon resistance systems of the Australian sheep blowfly (Lucilia cuprina) have been used previously to relate stress, departures from bilateral symmetry, developmental stability and relative fitness. These systems are now used to consider stress and asymmetry in a developmental context. Larval to adult development is shown to be significantly impaired after arrested development at 8 degrees Celcius, however the asymmetry score of adults of a given genotype is similar after arrested or continuous development. Selection against dieldrin–resistant and unmodified diazinon–resistant genotypes occurs during arrested development because greater proportions of these genotypes pupate at 8°C than do susceptible or modified diazinon–resistant genotypes. Pre–pupae of all genotypes complete development equally successfully when transferred from 8°C to 27°C. Adults fail to emerge when pupae formed at 8°C undergo this temperature transition. Temperature–shift experiments show the asymmetry score is determined between pre–pupal and pupal stages of the life cycle. This stage occurs at 27°C in arrested and continuously developing cultures providing an explanation for the independence of stress, selective mortality during developmental arrest and asymmetry score. The results emphasize the need for genetic, environmental and developmental data before an asymmetry phenotype can be directly related to developmental stability and relative fitness.