鳴叫是許多無尾兩棲類傳遞訊息最常利用的方式。在生殖場中，由多隻雄蛙形成的合唱團，往往有著激烈的鳴叫競爭。雄性莫氏樹蛙的宣告叫聲包含脈衝速率較低的慢速段落，與脈衝速率較高的快速段落，叫聲通常由至少一節慢速段落與數節快速段落組成。本研究欲瞭解雄性莫氏樹蛙在生殖競爭中的鳴叫策略。實驗在南仁山地區進行，以野外錄得的雄性宣告叫聲為基礎，合成不同複雜度（慢、快速段落節數），鳴叫速率和聲量的叫聲，在實驗室對雄蛙回播，記錄並分析雄蛙的鳴叫反應。結果發現，隨著回播叫聲的複雜度增加，雄蛙回應叫聲的慢速段落節數也隨著增加，且回應時間縮短並與回播叫聲重疊。在回播叫聲的速率增加時，雄蛙的慢速段落節數與鳴叫速率也隨其增加，但回應時間並不改變。而隨著回播的聲量增加，雄蛙的快速段落節數，叫聲長度，鳴叫速率和叫聲聲量均隨著增加，且縮短回應時間並與回播叫聲重疊。此結果顯示，雄性莫氏樹蛙會根據競爭雄蛙的叫聲特質而改變自己的叫聲，且可能有三種回應策略：(1)對常態聲量下複雜度增加的競爭叫聲，以增加慢速段落節數與叫聲的干擾度來回應，此方式可能較不消耗能量，(2)對常態聲量下鳴叫速率增加的競爭叫聲，以增加慢速段落節數和鳴叫速率，但不改變回應時間來反應，此方式可能較前者消耗更多能量，(3)當競爭叫聲的聲量增加或競爭個體較接近時，將嚴重干擾鳴叫中的雄蛙，此時雄蛙以可能消耗更多能量的方式，同時增加快速段落節數，叫聲的長度、速率與聲量，並增加叫聲的干擾度來回應。此三種不同的情況可能代表不同程度的競爭壓力，而雄蛙在競爭中亦可能利用不同的回應策略，來節省能量上的開支，並增加生殖的成功率。

　Male anurans modify their call properties according to different contexts in choruses for male-male competition and female attraction. Male R. moltrechti produce advertisement calls consisted of two phases with slow and fast phase rates. In this study, acoustic responses of male R. moltrechti to various conspecific advertisement calls, differing in complexity (number of notes in the phases), call rate, and sound pressure level, were investigated by playback experiments. Males responded to increasing call complexity by adding notes to slow phase and increasing overlap with the stimuli. Males responded to increasing call rate by adding notes to slow phase and increasing their own call rate, but avoiding overlap with the stimuli. In addition, males responded to increasing sound pressure level by adding notes to fast phase and increasing call rate, loudness, and overlapping with the stimuli. All these responses by male R. moltrechti probably signal a stronger aggression to the competitor and increase the caller’s attractiveness to the females. The results indicate that male R. moltrechti can adjust their call properties according to the rival’s acoustic property, which may be correlated with the risk levels of losing attraction to females. These adjustments probably conserve their energy expense and maximize their chances of mating success.

Arak, A. 1983. Vocal interactions, call matching and territoriality in a Sri Lankan treefrog, Philautus leucorhinus (Rhacophoridae). Animal Behavior, 31, 292-302.
Bee, M. A. & Perrill, S. A. 1996. Responses to conspecific advertisement calls in the green frog (Rana clamitans) and their role in male-male communication. Behaviour, 133, 283-301.
Bee, M. A., Perrill, S. A. & Owen, P. C. 1999. Size assessment in simulated territorial encounters between male green frogs (Rana clamitans). Behavior Ecology and Sociobiology, 45, 177-184.
Bee, M. A., Perrill, S. A. & Owen, P. C. 2000. Male green frogs lower the pitch of acoustic signals in defrnse of territories: a possible dishonest signal of size? Behavioral Ecology, 11, 169-277.
Bosch, J. & Márquez, R. 2001. Call timing in male-male acoustical interactions and female choice in the midwife toad Alytes obstricans. Copeia, 2001, 169-177.
Bosch, J. & Márquez, R. 2002. Female preference function related to preccedence effect in an amphibian anuran (Alytes cisternasii): tests with non-overlapping calls. Behavioral Ecology, 13, 149-153.
Brenowitz, E. A. & Rose, G. J. 1994. Behavioural plasticity mediates aggressive in choruses of the Pacific treefrog. Animal Behavior, 47, 633-641.
Brenowitz, E. A. & Rose, G. J. 1999. Female choice and plasticity of male calling behaviour in the Pacific treefrog. Animal Behavior, 57, 1337-1342.
Brenowitz, E. A., Wilcaynski, W. & Zakon, H. H. 1984. Acoustic communication in spring peepers. Journal of Comparative Physiology A, 155, 585-592.
Bush, S. L. 1997. Vocal behavior of males and females in the majorcan midwife toad. Journal of Herpetology, 31, 251-257.
Capranica, R. R. 1968. The vocal repertoire of the bullfrog (Rana catesbeiana). Behaviour, 31, 302-325.
Chen, T.-Y. D. 2002. Male advertisement call and female choice in Moltrecht's treefrog, Rhacophcrus moltrechti. Department of Biology. Tainan, Taiwan National Cheng Kung University.
Dyson, M. L., Henzi, S. P., Halliday, T. R. & Barrett, L. 1998. Success breeder success in mating male reed frogs (Hyperolius marmoratus). Proceedings of the Royal Society of London. Series B. Biological Sciences, 265, 1417-1421.
Dyson, M. L. & Passmore, N. I. 1988. Two-choice phonotaxis in Hyperolius marmoratus (Anura: Hyperoliidae): the effect of temporal variation in presented stimuli. American Zoologist, 36, 648-652.
Fellers, G. M. 1979. Aggression, territoriality, and mating behaviour in north American treefrogs. Animal Behavior, 27, 107-119.
Gerhardt, H. C. 1991. Female mate choice in treefrogs: static and dynamic acoustic criteria. Animal Behavior, 42, 615-635.
Gerhardt, H. C. & Huber, F. 2002. Acoustic communication in insects and anurans. Chicago: The University of Chicago Press.
Gerhardt, H. C., Roberts, J. D. & Bee, M. A. 2000. Call matching in the quacking frog (Crinia georgiana). Behavioral Ecology and Sociobiology, 48, 243-251.
Given, M. F. 1993. Male response to female vocalizations in the carpenter frog, Rana virgatipes. Animal Behavior, 46, 1139-1149.
Grafe, T. U. 1996a. Enerfetics of vocalization in the African reed frog (Hyperolius marmoratus). Comparative Biochemistry and Physiology, 114, 235-243.
Grafe, T. U. 1996b. The function of call alternation in the African reed frog (Hyperolius marmoratus): precise call timing prevents auditory masking. Behavioral Ecology and Sociobiology, 38, 149-158.
Grafe, T. U. 1999. A function of synchronous chorusing and a novel female preference shift in an anuran. Proceedings of the Royal Society of London. Series B. Biological Sciences, 266, 2331-2336.
Howard, R. D. & Palmer, J. G. 1995. Female choice in Bufo americanus: effects of dominant frequency and call order. Copeia, 1995, 212-217.
Ibáñez, R. 1993. Female phonotaxis and call overlap in the Neotropical glassfrog Centrolrnrlla granulosa. Copeia, 1993, 846-850.
Jennions, M. D., Bishop, P. J., Backwell, P. R. Y. & Passmore, N. I. 1995. Call rate variability and female choice in the African frog, Hyperolius marmoratus. Behaviour, 132, 709-720.
Kuramoto, M. 1986. Call structures of Rpacophorid frogs from Taiwan. Scientific Report of the Laboratory for Amphibian Biology, Hiroshima University, 8, 45-68.
Lemon, R. E. 1971. Vocal communication of the frog Eleutherodactylus martinicensis. Canadian Journal of Zoology, 49, 211-217.
Littlejohn, M. J. & Harrison, P. A. 1985. The functional significance of the diphasic advertisement call of Geocrinia victoriana (Anura: Leptodactylidae). Behavior Ecology and Sociobiology, 16, 363-373.
Lopez, P. T. & Narins, P. M. 1991. Mate choice in the neotropical frog, Eleutherodactylus coqui. Animal Behavior, 41, 757-772.
Márquez, R., Pargana, J. M. & Crespo, E. G. 2001. Acoustic competition in male Pelodytes ibericus (Anura: Pelodytidae): interactive playback tests. Copeia, 2001, 1142-1150.
Marshall, V. T., Humfeld, S. C. & Bee, M. A. 2003. Plasticity of aggressive signalling and its evolution in male spring peeper, Pseudacris crucifer. Animal Behavior, 65, 1223-1234.
Michael, S. F. 1996. Courtship calls of three species of Eleutherodactylus from Puerto Rico (anura: Leptodactylidae). Herpetologica, 52, 116-120.
Murphy, C. G. 1994. Chorus tenure of male barking treefrogs, Hyla gratiosa. Animal Behavior, 48, 763-777.
Murphy, C. G. & Gerhardt, H. C. 2000. Mating preference functions of individual female barking treefrogs, Hyla gratiosa, fro two properties of male advertisement calls. Evolution, 54, 660-669.
Passmore, N. I., Boshop, P. J. & Vaithness, N. 1992. Calling behaviour influences mating success in male painted reed frogs, Hyperolius marmoratus. Ethology, 92, 227-241.
Prestwich, K. N. 1994. The energetics of acoustic signaling in anurans and insects. American Zoologist, 34, 625-643.
Rand, A. S. & Ryan, M. J. 1981. The adaptive significance of a complex vocal repertoire in a neotropical frog. Zeitschriift fur Tierpsychologie, 57, 209-214.
Robertson, J. G. M. 1984. Acoustic spacing by breeding males of Uperoleia rugosa (anura: Leptodatylidae). Zeitschriift fur Tierpsychologie, 64, 283-297.
Rose, G. J. & Brenowitz, E. A. 1997. Plasticity of aggressive thresholds in Hyla regilla: discrete accommodation to encounter calls. Animal Behavior, 53, 353-361.
Rose, G. J. & Brenowitz, E. A. 2002. Pacific treefrogs use temporal integration to differentiate advertisement from encounter calls. Animal Behavior, 63, 1183-1190.
Rosen, M. & Lemon, R. E. 1974. The vocal behavior of spring peepers, Hyla crucifer. Copeia, 1974, 940-950.
Ryan, M. J. 1988. Energy, calling, and selection. American Zoologist, 28, 885-898.
Ryan, M. J. 2001. Anuran communication. Washington and London: Smithsonian Institution Press.
Schwartz, J. J. 1986. Male calling behavior and female choice in the neotropical treefrog Hyla microcephala. Ethology, 73, 116-127.
Schwartz, J. J. 1987. The finction of call alternation in anuran amphibians: a test of three hypotheses. Evolution, 41, 461-471.
Schwartz, J. J. & Rand, S. 1991. The consequences for communication of call overlap on the tungrar frpg, a Neotropical anuran with a frequency-modulated call. Ethology, 89, 73-83.
Schwartz, J. J. & Wells, K. D. 1984a. Interspecific acoustic interactions of the neotropical treefrog Hyla ebraccata. Behavior Ecology and Sociobiology, 14, 211-224.
Schwartz, J. J. & Wells, K. D. 1984b. Vocal behavior of the Neotropical treefrog Hyla phlebodes. Herpetologica, 40, 452-463.
Schwartz, J. J. & Wells, K. D. 1985. Intra- and interspecific vocal behavior of neotropical treefrog Hyla microcephala. Copeia, 1985, 27-38.
Stewart, M. M. & Rand, A. S. 1991. Vocalizations and the defense of retreat sites by male and female frogs, Eleutherodactylus coqui. Copeia, 1991, 1013-1024.
Sullivan, B. K. 1982. Sexual selection in eoodhouse's toad (Bufo woodhousei) I. chorus organization. Animal Behavior, 30, 680-686.
Sullivan, B. K. & Hinshaw, S. H. 1992. Female choice and selection on male calling behaviour in the grey treefrog Hyla versicolor. Animal Behavior, 44, 733-744.
Sullivan, B. K. & Wagner, W. E. J. 1988. Variation in advertisement and release calls, and social influences on calling behavior in the Gulf Coast toad (Bufo valliceps). Copeia, 1988, 1014-1020.
Taigen, T. L. & Wells, K. D. 1985. Energetics of vocalization by an anuran amphibian (Hyla versicolor). Journal of Comparative Physiology B, 155, 163-170.
Tobias, M. L., Barnard, C., O'hagan, R., Horng, S. H., Rand, M. & Kelley, D. B. 2004. Vocal communication between male Xenopus laevis. Animal Behavior, 67, 353-365.
Wagner, W. E. J. 1989a. Fighting, assessment, and frequency alteration in Blanchard's cricket frog. Behavior Ecology and Sociobiology, 25, 429-436.
Wagner, W. E. J. 1989b. Graded aggressive signals in Blanchard's cricket frog: vocal responses to opponent proximity and size. Animal Behavior, 38, 1025-1038.
Wagner, W. E. J. 1989c. Social correlates of variation in male calling behavior in Blanchard's cricket frog, Acris crepitans nlanchardi. Ethology, 82, 27-45.
Wells, K. D. 1977. The social behaviour of anuran amphibians. Animal Behavior, 25, 666-693.
Wells, K. D. 1980. Behavioral ecology and social organization of a dendrobatid frog (Colostethus inguinalis). Behavior Ecology and Sociobiology, 6, 199-209.
Wells, K. D. & Schwartz, J. J. 1984. Vocal communication in a neotropical treefrog, Hyla ebraccata: advertisement calls. Animal Behavior, 32, 405-420.
Wells, K. D. & Taigen, T. L. 1986. The effect of social interactions on calling energetics in the gray treefrog (Hyla versicolor). Behavior Ecology and Sociobiology, 19, 9-18.
Wen, H.-S. 2001. The reproductive ecology of Moltrecht's treefrog (Rhacophorus moltrechti) at Pu-Lo-Wan in Taroko National Park. Graduate Institute of Nature Resource. Whalan, Taiwan National Dong Hwa University.
Whiteny, C. L. & Krebs, J. R. 1975. Mate selection in Pacific treefrogs. Nature, 255, 325-326.
Wilczynski, W. & Brenowitz, E. A. 1988. Acoustic cues mediate inter-male spacing in a neotropical frog. Animal Behavior, 36, 1054-1063.