Data/hora: 17/06/2024 14:14:28

Provedor de dados: | 74
País: | Brazil
Título: | Temperature and the progeny sex-ratio in Sciara ocellaris (Diptera, Sciaridae)
Autores: | Nigro,Rogério G.; Campos,Maria Cristina C.; Perondini,André Luiz P.
Data: | 2007-01-01
Ano: | 2007
Palavras-chave: | Sex determination; Chromosome elimination; Embryo; Insect.
Resumo: | 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.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572007000100026
Editor: | Sociedade Brasileira de Genética
Relação: | 10.1590/S1415-47572007000100026
Formato: | text/html
Fonte: | Genetics and Molecular Biology  v.30 n.1 2007
Fonte: | info:eu-repo/semantics/openAccess