Temperature-sex determination in Podocnemis expansa (Testudines, Podocnemididae)

Iheringia. Série Zoologia

Kelly Bonach²  Adriana Malvasio¹  Eliana R. Matushima¹  Luciano M. Verdade¹ 

[1] ,Instituto Chico Mendes de Conservação da BiodiversidadeGoiânia GO ,Brazil

关键词: TSD;    thermosensitive period;    sex determination;    reproductive biology;    turtles;    TSD;    período termo-sensível;    determinação sexual;    biologia reprodutiva;    tartarugas;   

DOI  :  10.1590/S0073-47212011000200001

来源: SciELO

【 摘 要 】

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.

【 授权许可】

CC BY   
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