Sexual Dimorphism and Female Reproductive Trait of the Crab-eating Frog
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摘要:
用采自海南东寨港红树林保护区的58只(35 ♀♀ ,23 ♂♂)成体海陆蛙(Fejervarya cancrivora),通过测量头体长、体重、头长、头宽、吻长等11个形态特征指标和雌体卵巢质量(窝卵重),研究该种形态特征的两性异形和雌性繁殖特征,并检验雌性成体大小(头体长和体重)与其繁殖的相关性。雌雄两性个体的最小头体长分别为 44.9 mm 和 45.2 mm。除吻长和眼间距外,其余局部形态特征与头体长皆呈正相关性。头体长在雌雄两性之间差异显著,雌性显著大于雄性;而体重、头长、头宽等局部形态均无两性差异。海陆蛙雌体的窝卵重与头体长和体重之间皆成正相关关系,表明雌性可能是通过增大体型从而增加繁殖输出,而向较大体型发展。
Abstract:
We studied sexual dimorphism and female reproductive trait of the Crab-eating Frogs (Fejervarya cancrivora) based on 58 (35 ♀♀ , 23 ♂♂) adults collected from National Dongzhai Harbor Mangrove Reserve in Hainan Province. We measured eleven morphological variables on all the 58 specimens and weighed clutch mass on 29 pregnant females. The smallest of snout-urostyle length (SUL) was 44.9 mm for female and 45.2 mm for male. Except for the snout length and interorbital length, all the rest morphological traits were positively related to SUL. The SUL of adult female was significantly larger than adult male, while no any difference was found on the measurements of body weight, head length, and head width between female and male. There is sexual dimorphism between male and female in body size, female is larger than male. The clutch mass was positively related to the SUL and body mass. Our data indicate that the female frogs increase reproductive output by the way of increasing their body size.
