Life-history variation of Drosophila subobscura under lead pollution depends on population history
2014
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Prikaz svih podataka o dokumentuApstrakt:
Contamination represents environmental stress that can affect genetic
variability of populations, thus influencing the evolutionary processes.
In this study, we evaluate the relationship between heavy metal
contamination (Pb) and phenotypic variation, assessed by coefficients of
variation (CV) of life-history traits. To investigate the consequences
of population origin on variation of life history traits in Drosophila
subobscura in response to different laboratory conditions we compared
populations from relatively polluted and unpolluted environments. Prior
to experiment, flies from natural populations were reared for two
generations in standard Drosophila laboratory conditions. Afterwards,
all flies were cultured on three different media: one medium without
lead as the control, and the other two with different concentrations of
lead. Coefficients of variation (CV) of lifehistory traits (fecundity,
egg-to-adult viability and developmental time) were analyzed on flies
sampled in generations F2, F5 and F8 from these three groups. In later
generations samples from both polluted and unpolluted environments
showed the increased fecundity variation on media with lead. This
increase is expressed more in population from unpolluted environment. On
contrary, population from unpolluted environment had increased variation
of developmental time in earlier, F2 generation, compared to the
population from polluted environment. Our results showed that the
response to heavy metal contamination depends on the evolutionary
history of the populations regarding habitat pollution.
Ključne reči:
Coefficient of variation (CV); Drosophila subobscura; Lead pollution; Life-history traitsIzvor:
Genetika-Belgrade, 2014, 46, 3, 693-703
DOI: 10.2298/GENSR1403693K
ISSN: 1820-6069