Temperature-sex determination in Podocnemis expansa
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Data
2011-09-30
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https://icmbioe5-my.sharepoint.com/personal/kaliany_braganca_terceirizada_icmbio_gov_br/_layouts/15/onedrive.aspx?fromShare=true&ga=1&id=%2Fpersonal%2Fkaliany%5Fbraganca%5Fterceirizada%5Ficmbio%5Fgov%5Fbr%2FDocuments%2FPUBLICA%C3%87%C3%95ES%20ICMBIO%2FFase%201%2FPUBLICA%C3%87%C3%95ES%20KELLY%20BONACH%2FTemperature%2Dsex%2Epdf&parent=%2Fpersonal%2Fkaliany%5Fbraganca%5Fterceirizada%5Ficmbio%5Fgov%5Fbr%2FDocuments%2FPUBLICA%C3%87%C3%95ES%20ICMBIO%2FFase%201%2FPUBLICA%C3%87%C3%95ES%20KELLY%20BONACH
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151
Página final
155
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ABSTRACT. This study has been carried out at the central region of the Araguaia river on the border between the states of Goiás and Mato
Grosso in the Brazilian Amazon Basin from September to December 2000. We recorded temperature fluctuation, clutch-size, incubation period
and hatching success rate and hatchlings’ sex ratio of five nests of Podocnemis expansa (Schweigger, 1812). Despite the relatively small sample
size we infer that: a) nests of P. expansa in the central Araguaia river have a lower incubation temperature than nests located further south;
however, incubation period is shorter, hatching success rate is lower and clutch-size is larger; b) Podocnemis expansa may present a female-male female (FMF) pattern of temperature sex-determination (TSD); c) thermosensitive period of sex determination apparently occur at the last third of
the incubation period; and, d) future studies should prioritize the relationship between temperature variation (i.e., range and cycle) and embryos
development, survivorship and sex determination
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Palavras-chave
TSD, thermosensitive period, sex determination, reproductive biology, turtles