| Summary: | 碩士 === 國立中山大學 === 生物科學系研究所 === 104 === An effective signal emitted from animals must be detected and discriminated by the receiver after long-range transmission and modulated by local habitat structure. The acoustic adaptation hypothesis (AAH) predicted that animals would use specific call attributes in a closed environment to optimize propagation of the call. A burrow can be considered as an extremely such closed micro-habitat. However, it has been reported that variability in call attributes might also partly result from phenotypic flexibility. The goals of this study were to test AAH, comparing the call attributes between male frogs’ calling from the vegetation and inside burrows, and evaluate the calling flexibility for among different micro-habitats in Rhacophorus moltrechti. I recorded calls of 155 male R. moltrechti in Nanjenshan Reserve and other 6 sample sites. Among these, habitat structure was described for 49 males. Calls of 10 males were recorded before and after altering the local micro-habitat with EVA enclosure. The results show that among 18 call parameters, only inter-note interval in the slow phase was negatively correlated with vegetation density, not in agreement of the prediction. Ten call parameters differed between calling from frogs perched on vegetation and inside burrows. Inter-call interval and pulse duration in the 1st note were different between two types of calling sites after controlling for the effects of temperature and snout-vent length, which is in agreement of the predictions of the AAH. Only bandwidth at 10 dB was different between before and after altering the local micro-habitats. The results were partly in agreement with the AAH and the presence of call flexibility for micro-habitat changes.
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