Temperature and the progeny sex-ratio in Sciara ocellaris (Diptera, Sciaridae)
| Autor: | Rogério G. Nigro, Maria Cristina C. Campos, André Luiz P. Perondini |
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| Jazyk: | angličtina |
| Rok vydání: | 2007 |
| Předmět: | |
| Zdroj: | Genetics and Molecular Biology, Vol 30, Iss 1, Pp 152-158 (2007) |
| Druh dokumentu: | article |
| ISSN: | 1415-4757 1678-4685 |
| DOI: | 10.1590/S1415-47572007000100026 |
| Popis: | We found that the sex-ratio of an amphigenic strain of Sciara ocellaris varied widely from progenies with few males to progenies containing a larger proportion of males, with single-sex progenies being rare. The sex-ratio distributions were dependent on the temperature at which the stocks of flies were raised, with the sex-ratio distributions being symmetrical (i.e. about 50% males) at 18 °C and 20 °C while at the higher temperatures of 24 °C and 28 °C the distributions were skewed toward a high proportion of females with the mean proportion of males decreasing to about 30-37% per progeny. Temperature-shift experiments showed that high temperatures were effective only during the last stages of female pupal development plus a period after adult emergence, stages corresponding to oocyte maturation. When imagine females were exposed to temperatures as low as 12 °C the sex-ratio distributions of their progeny were skewed toward a high proportion of males per progeny. No differential fecundity was involved in these progeny sex-ratio modifications. Egg-to-adult survival was lower at 18 °C and 28 °C but no correlations with skewing in the sex ratio distributions were observed, indicating that modifications in progeny sex-ratio did not involve the differential survival of a particular sex. |
| Databáze: | Directory of Open Access Journals |
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