Temperature and the progeny sex-ratio in Sciara ocellaris (Diptera, Sciaridae)
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 w...
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| Format: | Article |
| Language: | English |
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Sociedade Brasileira de Genética
2007-01-01
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| Series: | Genetics and Molecular Biology |
| Subjects: | |
| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572007000100026 |
| _version_ | 1818358083412295680 |
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| author | Rogério G. Nigro Maria Cristina C. Campos André Luiz P. Perondini |
| author_facet | Rogério G. Nigro Maria Cristina C. Campos André Luiz P. Perondini |
| author_sort | Rogério G. Nigro |
| collection | DOAJ |
| description | 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. |
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| format | Article |
| id | doaj.art-f2a2895d8ab04455aa758ced2f6cc1b8 |
| institution | Directory Open Access Journal |
| issn | 1415-4757 1678-4685 |
| language | English |
| last_indexed | 2024-12-13T20:23:22Z |
| publishDate | 2007-01-01 |
| publisher | Sociedade Brasileira de Genética |
| record_format | Article |
| series | Genetics and Molecular Biology |
| spelling | doaj.art-f2a2895d8ab04455aa758ced2f6cc1b82022-12-21T23:32:38ZengSociedade Brasileira de GenéticaGenetics and Molecular Biology1415-47571678-46852007-01-0130115215810.1590/S1415-47572007000100026Temperature and the progeny sex-ratio in Sciara ocellaris (Diptera, Sciaridae)Rogério G. NigroMaria Cristina C. CamposAndré Luiz P. PerondiniWe 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.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572007000100026sex determinationchromosome eliminationembryoinsect |
| spellingShingle | Rogério G. Nigro Maria Cristina C. Campos André Luiz P. Perondini Temperature and the progeny sex-ratio in Sciara ocellaris (Diptera, Sciaridae) Genetics and Molecular Biology sex determination chromosome elimination embryo insect |
| title | Temperature and the progeny sex-ratio in Sciara ocellaris (Diptera, Sciaridae) |
| title_full | Temperature and the progeny sex-ratio in Sciara ocellaris (Diptera, Sciaridae) |
| title_fullStr | Temperature and the progeny sex-ratio in Sciara ocellaris (Diptera, Sciaridae) |
| title_full_unstemmed | Temperature and the progeny sex-ratio in Sciara ocellaris (Diptera, Sciaridae) |
| title_short | Temperature and the progeny sex-ratio in Sciara ocellaris (Diptera, Sciaridae) |
| title_sort | temperature and the progeny sex ratio in sciara ocellaris diptera sciaridae |
| topic | sex determination chromosome elimination embryo insect |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572007000100026 |
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