Embryonic mortality and clutch size of the foam-nesting treefrog Rhacophorus arboreus were observed in early summer of 2000 and 2001 at a small pond in a secondary forest on the campus grounds of Tokyo Metropolitan University. A total of 24 foam nests were monitored from just after spawning. When hatchlings emerged, the foam nests were collected and examined for embryonic mortality and clutch size. Embryonic mortality, averaging 0.233 (0.036–0.616, SD=0.173), varied markedly among nests. Logistic regression showed that the date of spawning had a significant effect on embryonic mortality: the nests constructed late in the season suffered higher mortality. Clutch size varied from 272 to 872 (x̄=522.1, SD=134.0). Multiple regression analysis showed that year and date of spawning had no significant effect on clutch size. A significant correlation was detected between clutch size and height of the nesting position (r=−0.563, P=0.004): those nests constructed higher above the pond water tended to have smaller clutches. Factors affecting egg mortality and clutch size are discussed.
You have requested a machine translation of selected content from our databases. This functionality is provided solely for your convenience and is in no way intended to replace human translation. Neither BioOne nor the owners and publishers of the content make, and they explicitly disclaim, any express or implied representations or warranties of any kind, including, without limitation, representations and warranties as to the functionality of the translation feature or the accuracy or completeness of the translations.
Translations are not retained in our system. Your use of this feature and the translations is subject to all use restrictions contained in the Terms and Conditions of Use of the BioOne website.