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Charles R. Hale, Director SRH 1.310, 2300 Red River Street D0800, Austin, TX 78712 • 512.471.5551

Michael J. Ryan


Clark Hubbs Regents Professor in Zoology, School of Biological Sciences
Michael J. Ryan



Animal behavior; sexual selection and communication in frogs and fish


Cummings, M.E.; Rosenthal, G.G.; Ryan, M.J. (2003) A private ultraviolet channel in visual communication. Proceedings of the Royal Society, London series B 270:897-904.

Ryan, M.J.; Kime, N.M. (2003) Selection on long distance acoustic signals. pp. 225-274. In: Simmons, A.; Fay, R.; Popper, A. editors, Springer Handbook of Auditory Research; Acoustic Communication. Springer Verlag, Berlin.

Burmeister, S.S.; Ophir, A.G.; Ryan, M.J.; Wilczynski, W.W. (2002) Information transfer during cricket frog contests. Animal Behaviour 64:715-725.

Bosch, J.; Rand, A.S.; Ryan, M.J. (2002) Response to variation in chuck frequency by male and female tu'ngara frogs. Herpetologica, 58:95-103.

Rosenthal, G.G.; Wagner, W.E. Jr.; Ryan, M.J. (2002) Secondary reduction of preference for swords in the pygmy swordtail Xiphophorus nigrensis (Pisces: Poeciliidae). Animal Behaviour, 63:37-45.

Ryan, M.J.; Rosenthal, G.G. (2001) Variation and selection in swordtails. pp 133-148. In: Dugatkin, L. editor, Model Systems in Behavioral Ecology. Princeton University Press, Princeton, New Jersey.

Wilczynski, W.; Ryan, M.J.; Rand A.S. (2001) Evolution of calls and auditory tuning in the Physalaemus species group. Brain, Behavior and Evolution, 58:137-151.

Witte, K.; Ryan, M.J.; Wilczynski, W. (2001) Changes in the frequency structure of a mating call decrease its attractiveness to females in the cricket frog Acris crepitans blanchardi. Ethology, 685-699.

Ryan, M.J. (2001) Food, song and speciation. [News and Views]. Nature 409:139-140.

Ryan, M.J.( 2001) Seeing red in speciation. [News & Views]. Nature 411:900-901.

Ryan, M.J.; Rand. A.S. (2001) Feature weighting in signal recognition and discrimination by the tu'ngara frog. Pp. 86-101. In: Ryan, M.J. editor, Anuran Communication. Smithsonian Institution Press, Washington D.C.

Ryan, M.J.; Phelps S.M.; Rand A.S. (2001) How evolutionary history shapes recognition mechanisms. Trends in Cognitive Science 5:143-148.

Dries L.A.; Morris M.R.; Ryan, M.J. (2001) Why are some male pygmy swordtails large? Copeia. 2001: 355-364.

Gabor, C.R.; Ryan, M.J. (2001) Geographic variation in reproductive character displacement in mate choice by male sailfin mollies. Proceedings of the Royal Society, London series B 268:1063-1071.

Rosenthal , G.G.; Flores Martinez, T.Y.; García de León, F.J.; Ryan, M.J. (2001) Shared preferences by predators and females for males ornaments in swordtails. The American Naturalist 158:146-154.

Schlupp, I.; McNab, R.; Ryan, M.J. (2001) Sexual harassment as a cost for molly females: bigger males cost less. Behaviour:138:277-286.

Ryan, M.J.; Getz, W. (2000). Signal decoding and receiver evolution: An analysis using an artificial neural network. Brain, Behavior and Evolution 56:45-62.

Bosch, J.; Rand, A.S.; Ryan, M.J. (2000) Acoustic competition in Physalaemus pustulosus, a differential response to calls of relative frequency. Ethology 106:865-871.

Bosch, J.; Rand , A.S. Ryan, M.J. (2000) Signal variation and call preferences for whine frequency in the Túngara frog, Physalaemus pustulosus. Behavioral Ecology and Sociobiology 49:62-66.

Kime N.M.; Turner W.R; Ryan M.J. (2000) The transmission of advertisement calls in Central American frogs. Behavioral Ecology 11:71-83.

Marsh, D.M.; Rand, A.S.; Ryan M.J. (2000) Effects of inter-pond distance on breeding ecology of túngara frogs. Oecologia 122:505-513.

Phelps, S.M.; Ryan, M.J. (2000) History influences signal recognition: Neural network models of túngara frogs. Proceedings of the Royal Society, London series B 267:1633-1639.

Sun, L.; Wilczynski, W.; Rand, A.S; Ryan, M.J. (2000) Trade-off in short and long distance communication in túngara (Physalaemus pustulosus) and cricket (Acris crepitans) frogs. Behavioral Ecology 11:102-109.

Rosenthal, G.G.; Ryan, M.J. (2000) Visual and acoustic communication in nonhuman animals: a comparison. Journal of Bioscience 25:285-290.

Witte, K.; Chen, K-C.; Wilczynski, W.; Ryan, M.J. (2000) Influence of amplexus on phonotaxis in the cricket frog Acris crepitans blanchardi. Copeia 2000:257-261.

Ryan, M.J. (1999) Phylogeny and mate choice. Mus. Reg. Sci. nat. Torino 1999:387-392.

Ryan, M.J. 1999. Sexual selection and sensory exploitation [Response]. Science 283:1083a

Ryan, M.J. (1999) Electrifying diversity [News & Views]. Nature 400:211-212.

Ryan, M.J.; Rand. A.S. (1999) Phylogenetic inference and the evolution of communication in túngara frogs. pp. 535-557. In: Hauser, M.; Konishi, M. editors, The Design of Animal Communication. MIT Press, Cambridge, MA.

Ryan, M.J.; Rand. A.S. (1999) Phylogenetic influences on mating call preferences in female túngara frogs (Physalaemus pustulosus). Animal Behaviour 57:945-956.

Burmeister, S.; Wilczynski, W.; Ryan, M.J. (1999) Temporal call changes and social context affect graded signaling in cricket frogs. Animal Behaviour 57:611-618 .

McLennan, D.A.; Ryan, M.J. (1999) Interspecific recognition and discrimination based upon olfactory cues in swordtails. Evolution 53:880-888.

Schlupp, I.; Waschulewski, M.; Ryan, M.J. (1999) Female preferences for naturally-occurring novel male traits. Behaviour 136; 519-527.

Wilczynski, W.; Rand, A.S.; Ryan, M.J. (1999) Female preferences for temporal order of call components in the túngara frog: A Bayesian analysis. Animal Behaviour 58:841-851.

Wilczynski, W.; Ryan, M.J. (1999) Geographic variation in animal communication systems. In: Foster, S.A.; Endler, J., editors, Geographic Diversification of Behavior: An Evolutionary Perspective, pp . 234-261. Oxford University Press, Oxford.

Ryan, M.J. (1998) Receiver biases, sexual selection and the evolution of sex differences. Science. 281:1999-2003.

Ryan, M.J.; Autumn, K,; Wake, D.B. (1998) Integrative biology and sexual selection. Integrative Biology 1:68-72.

Ryan, M.J.; Kime, N.M.; Rosenthal, G.G. (1998) Patterns of evolution in human speech processing and animal communication. Behavioral and Brain Science 21:282-283.

Ryan, M.J.; Rand. A.S. (1998) Evoked vocal response in male túngara frogs: Preexisting biases in male responses? Animal Behaviour 56:1509-1516.

Cannatella, D.C.; Hillis, D.M.; Chippinendale, P.; Weigt, L.; Rand, A.S.; Ryan M.J. (1998) Phylogeny of frogs of the Physalaemus pustulosus species group, with an examination of data incongruence. Systematic Biology 47:311-335.

Kime, N.M., Rand, A.S., Kapfer, M., Ryan, M.J. (1998) Repeatability of female choice in the túngara frog: A permissive preference for complex characters. Animal Behaviour 55:641-649.

McClelland, B.E.; Wilczynski, W.; Ryan, M.J. (1998) Intraspecific variation in laryngeal and ear morphology in male cricket frogs (Acris crepitans). Biological Journal of the Linnean Society 63:51-67.

Phelps, S.M.; Ryan, M.J. (1998) Neural networks predict response biases in female túngara frogs. Proceeding of the Royal Society, London series B 265:279-285.

Witte, K.; Ryan, M.J. (1998) Male body size influences mate-choice copying in the sailfin molly Poecilia latipinna. Behavioral Ecology 9:534-539.

Ryan, M.J. 1998. A model fish (review of Sex, Color and Mate Choice in Guppies). Trends in Ecology and Evolution 13:294.

Ryan, M.J. 1998. Principle with a handicap (review of The Handicap Principle). Quarterly Review of Biology 73477-479.

Ryan, M.J. (1997) Sexual selection and mate choice. pp. 179-202. In: J.R. Krebs, N.B. Davies, editors, Behavioural Ecology, An Evolutionary Approach. fourth edition. Blackwell, Oxford.

Marler, C.A.; Foran, C. Ryan, M.J. (1997) The influence of experience on mating preferences of the gynogenetic Amazon molly. Animal Behaviour 53:1035-1041.

Marler, C.A.; Ryan, M.J. (1997) Origin and maintenance of a female mating preference. Evolution 51:1244-1248.

McLennan, D.A.; Ryan, M.J. (1997) Responses to conspecific and heterospecific olfactory cues in the swordtail Xiphophorus cortezi. Animal Behaviour 54:1077-1088.

Rand, A.S.; Bridarolli, M.E.; Dries, L.; Ryan, M.J. (1997) Light levels influence female choice in túngara frogs: predation risk assessment? Copeia 1997:447-450.

Schlupp, I.; Ryan, M.J. (1997) Male mollies (Poecilia latipinna) copy the mate choice of other males. Behavioral Ecology 8:104-107.

Ryan, M.J. 1997. Animal communication and evolution (review of Evolution and Communication). Evolution 51:1333-1337.

Ryan, M.J. (1996) Phylogenetics and behavior: some cautions and expectations. pp. 1-21. In: Martins, E. editor, Phylogenies and the Comparative Method in Animal Behavior. Oxford University Press, Oxford.

Ryan, M.J.; Dries, L.A.; Batra, P.; Hillis, D.M. 1996. Male mate preference in a gynogenetic species complex of Amazon mollies. Animal Behaviour 52:1225-1236.

Ryan, M.J.; Rand, A.S.; Weigt, L.A. 1996. Allozyme and advertisement call variation in the túngara frog, Physalaemus pustulosus. Evolution 50:2435-2453.

Marler, C.A.; Ryan, M.J. 1996. Energetic constraints and steroid hormone correlates of male calling behaviour in the túngara frog. Journal of Zoology 240:397-409.

McClelland, B.E.; Wilczynzksi, W.; Ryan, M.J. 1996. Correlations between call characteristics and morphology in male cricket frogs (Acris crepitans). Journal of Experimental Biology 199:1907-1919.

Morris, M.R.; Wagner, W.E. Jr.; Ryan, M.J. 1996. A negative correlation between trait and and mate preference in Xiphophorus pygmaeus. Animal Behaviour 52:1193-1203.

Morris, M.R.; Wagner, W.E. Jr.; Ryan, M.J. 1996. A negative correlation between trait and and mate preference in Xiphophorus pygmaeus. Animal Behaviour 52:1193-1203.

Morris, M.R.; Ryan, M.J. 1996. Sexual difference in signal-receiver coevolution. Animal Behaviour 52:1017-1024.

Schlupp, I.; Ryan, M.J. 1996. Mixed-species shoals and the maintenance of a sexual-asexual mating system in mollies. Animal Behaviour 52:885-890.

Ryan, M.J. 1996. Speciation and the recognition concept, theory and application (review of). Quarterly Review of Biology 71:274-275.

Ryan, M.J. 1996. A natural history of amphibians (review of). Animal Behaviour 52:1058.

Ryan, M.J.; Rand, A.S. 1995. Female responses to ancestral advertisement calls in the túngara frog. Science 269, 390-392.

Ryan. M.J.; Warkentin, K.M.; McClelland, B.E.; Wilczynski, W. 1995. Fluctuating asymmetries and advertisement call variation in the cricket frog, Acris crepitans. Behavioral Ecology 6:124-131.

Baer, C.F.; Dantzker, M.; Ryan, M.J. 1995. Schooling behavior in a color polymorphic poeciliid fish: laboratory observations. Environmental Biology of Fishes 43:207-212.

Cocroft, R.C.; Ryan, M.J. 1995. Patterns of mating call evolution in toads and chorus frogs. Animal Behaviour 49:283-303.

Morris, M.R.; Gass, L.; Ryan, M.J. 1995. Assessment and individual recognition of opponents in the pygmy swordtails Xiphophorus nigrensis and X. multilineatus. Behavioral Ecology 6:274-279.

Morris, M.R.; Mussel, M.; Ryan, M.J. 1995. Vertical bars on male Xiphophorus multilineatus: a signal that deters rival males and attracts females. Behavioral Ecology 6:274-279.

Morris, M.R.; Ryan, M.J. 1995. Large body size in the pygmy swordtail Xiphophorus pygmaeus. Biological Journal of the Linnean Society 54:383-395.

Sullivan, B.K.; Ryan, M.J.; Verrill, P. 1995. Sexual selection and mating systems in amphibians. pp. 469-517. In: Sullivan, B.K.; Heatwole, H., editors, Social Behavior of Amphibians, Surrey Beatty & Sons, New York.

Wilczynski, W.; Rand, A.S.; Ryan, M.J. 1995. The processing of spectral cues by the call analysis system of the túngara frog, Physalaemus pustulosus. Animal Behaviour 49:911-929.

Ryan, M.J. 1995. Offsetting advantages (review of Sexual Selection). Science 267:712-713.

Ryan, M.J. 1994. Mechanistic studies in sexual selection. pp. 190-215. In: Real, L., editor, Behavioral Mechanisms in Evolutionary Ecology. University of Chicago Press, Chicago.

Foran, M.C.; Ryan, M.J. 1994. Female-female competition in a unisexual/bisexual complex of mollies. Copeia 1994:504-508.

Schlupp, I.; Marler, C.A.; Ryan, M.J. 1994. Benefit to male sail fin mollies of mating with heterospecific females. Science 263:373-374.

Ryan, M.J.; Rand, A.S. 1993. Phylogenetic patterns of behavioral mate recognition systems in the Physalaemus pustulosus species group (Anura: Leptodactylidae): the role of ancestral and derived characters and sensory exploitation. pp. 251-267. In: D.R. Lees, D. Edwards, editors, Evolutionary Patterns and Processes. Linnean Society Symposium Series, No. 14, Academic Press, London.

Ryan, M.J.; Rand, A.S. 1993. Species recognition and sexual selection as a unitary problem in animal communication. Evolution 47:647-657.

Ryan, M.J.; Rand. A.S. 1993. Sexual selection and signal evolution: the ghost of biases past. Philosophical Transactions of the Royal Society series B. 340:187-195.

Ryan, M.J. 1993. Sexual selection on P-alleles and the evolution of mating asymmetries in swordtails (Xiphophorus nigrensis and X. pygmaeus). pp. 269-277. In: J.H. Schröder, J. Bauer, M. Schartl, editors, Trends in Ichthyology, An International Perspective. Blackwell Scientific Publications, Oxford.

Ryan, M.J. 1992. Costs of reproduction. In: Feder, M., editor, Physiology of the Amphibians. pp. 426-434. University of Chicago, Chicago.

Ryan, M.J.; Keddy-Hector, A. 1992. Directional patterns of female mate choice and the role of sensory biases. American Naturalist 139:S4-S35.

Ryan, M.J.; Pease, C.M.; Morris, M.R. 1992. A genetic polymorphism in the swordtail Xiphophorus nigrensis: testing the prediction of equal fitnesses. American Naturalist 139:21-31.

Ryan, M.J.; Perrill, S.A.; Wilczynski, W. 1992. Auditory tuning and call frequency predict population-based mating preferences in the cricket frog, Acris crepitans. American Naturalist 139:1370-1383.

Keddy-Hector, A.; Wilczynski, W.; Ryan, M.J. 1992. Call patterns and basilar papilla tuning in cricket frogs. II. Intrapopulational variation and allometry. Brain, Behavior and Evolution 39:238-246.

Rand, A.S.; Ryan, M.J.; Wilczynski, W. 1992. Signal redundancy and receiver permissiveness in acoustic mate recognition by the túngara frog, Physalaemus pustulosus. American Zoologist 32:81-90.

Wilczynski, W.; Ryan, M.J. 1992. Introduction to the symposium: Mechanisms of mate choice. American Zoologist 32:15-17.

Wilczynski, W.; Keddy-Hector, A.; Ryan, M.J. 1992. Call patterns and basilar papilla tuning in cricket frogs. I. Differences among populations and between sexes. Brain, Behavior and Evolution 39:229-237.

Morris, M.J.; Batra, P.; Ryan, M.J. 1992. Male-male competition and access to females. Copeia 1992:980-986.

Morris, M.R.; Ryan, M.J. 1992. Breeding cycles in natural populations of Xiphophorus nigrensis, X. multilineatus and X. pygmaeus. Copeia 1992:1074-1077.

Ryan, M.J. 1992. Sexy males and sterile females (review of The Peacock and the Ant). Cell 71:367-368.

Kirkpatrick, M.; Ryan, M.J. 1991. The paradox of the lek and the evolution of mating preferences. Nature 350:33-38.

Ryan, M.J. 1991. Sexual selection and communication in frogs: some recent advances. Trends in Ecology and Evolution 6:351-354.

Ryan, M.J.; Wilczynski, W. 1991. Evolution of intraspecific variation in the advertisement call of a cricket frog (Acris crepitans, Hylidae). Biological Journal of the Linnean Society 44: 249-271.

Ryan, M.J. 1990. Sensory systems, sexual selection, and sensory exploitation. Oxford Surveys in Evolutionary Biology 7:157-195.

Ryan, M.J. 1990. Signals, species, and sexual selection. American Scientist 78:46-52.

Ryan, M.J.; Cocroft, R.B.; Wilczynski, W. 1990. The role of environmental selection in intraspecific divergence of mate recognition signals in the cricket frog, Acris crepitans. Evolution 44:1869-1872.

Ryan, M.J.; Drewes, R.C. 1990. Vocal morphology of the Physalaemus pustulosus species group (Family Leptodactylidae): morphological response to sexual selection for complex calls. Biological Journal of the Linnean Society 40:37-52.

Ryan, M.J.; Fox, J.H.; Wilczynski, W.; Rand, A.S. 1990. Sexual selection for sensory exploitation in the frog Physalaemus pustulosus. Nature 343:66-67.

Ryan, M.J.; Hews, D.K.; Wagner, W.E. Jr. 1990. Sexual selection on alleles that determine body size in the swordtail Xiphophorus nigrensis. Behavioral Ecology and Sociobiology 26:231-237.

Ryan, M.J.; Rand, A.S. 1990. The sensory basis of sexual selection for complex calls in the túngara frog, Physalaemus pustulosus (sexual selection for sensory exploitation). Evolution 44:305-314.

Crapon de Caprona, M.; Ryan, M.J. 1990. Conspecific mate recognition in swordtails, Xiphophorus nigrensis and X. pygmaeus (Poeciliidae): olfactory and visual cues. Animal Behaviour 39:290-296.

Morris, M.R.; Ryan, M.J. 1990. Age at sexual maturity of Xiphophorus nigrensis in nature. Copeia 1990:745-751.

Ryan, M.J.; Causey, B.J. 1989. Alternative mating behavior in the swordtails Xiphophorus nigrensis and Xiphophorus pygmaeus (Pisces: Poeciliidae). Behavioral Ecology and Sociobiology 24:341-348.

Ryan, M.J.; Sullivan, B.K. 1989. Transmission effects on patterns of amplitude modulation in the advertisement calls of two toads, Bufo woodhousii and Bufo valliceps. Ethology. 80:182-189.

Bruns, V.; Burda, H.; Ryan, M.J. 1989. Ear morphology of the frog-eating bat (Trachops cirrhosus, Family Phylostomidae): Apparent specializations for low-frequency hearing. Journal of Morphology 199:103-118.

Wilczynski, W.; Ryan, M.J.; Brenowitz, E.A. 1989. The display of the blue-black grassquit: the acoustic advantage of getting high. Ethology 80:218-222.

Ryan, M.J. 1988. Constraints and patterns in the evolution of anuran acoustic communication. In: B. Fritzsch, M. Ryan, W. Wilczynski, W. Walkowiak, T. Hetherington, editors, The Evolution of the Amphibian Auditory System. pp.637-677.

John Wiley and Sons Inc., New York. Ryan, M.J. 1988. Energy, calling, and selection. American Zoologist 28:885-898.

Ryan, M.J. 1988. Phenotype, genotype, swimming endurance and sexual selection in a swordtail (Xiphophorus nigrensis). Copeia 1988: 484-487.

Ryan, M.J.; Wilczynski, W. 1988. Coevolution of sender and receiver: effect on local mate preference in cricket frogs. Science 240:1786-1788.

Nyman, S.; Ryan, M.J.; Anderson, J.D. 1988. The distribution of the Ambystoma jeffersonianum complex in New Jersey, and a re-evaluation of some hypotheses on the origin and distribution of the complex. Journal of Herpetology 22:224-228.

Wilczynski, W.; Ryan, M.J. 1988. The amphibian auditory system as a model for neurobiology, behavior and evolution. In: B. Fritzsch, M. Ryan, W. Wilczynski, W. Walkowiak, T. Hetherington, editors, The Evolution of the Amphibian Auditory System. pp. 3-12. John Wiley and Sons Inc., New York.

Fritzsch, B.; Ryan, M.; Wilczynski, W.; Hetherington, T.; Walkowiak, W. (editors) 1988. The Evolution of the Amphibian Auditory System. John Wiley and Sons, New York.


Ryan, M.J.; Tuttle, M.D. 1987. The role of prey generated sounds, vision, and echolocation in prey localization by the African bat Cardioderma cor (Megadermatidae). Journal of Comparative Physiology 161:59-66.

Ryan, M.J.; Wagner, W. 1987. Asymmetries in mating preferences between species: female swordtails prefer heterospecific mates. Science 236:595-597.

Ryan, M.J. 1986. Environmental bioacoustics: evaluation of a commonly used experimental technique. Animal Behaviour 34:931-933.

Ryan, M.J. 1986. Factors influencing the evolution of acoustic communication: biological constraints. Brain, Behavior and Evolution 28:70-82.

Ryan, M.J. 1986. Neuroanatomy influences speciation rates among anurans. Proceedings of the National Academy of Sciences 83:1379-1382.

Ryan, M.J. 1986. The Panamanian love call. Natural History 95:36-43.

Ryan, M.J. 1986. Synchronized calling in a treefrog (Smilisca sila): short behavioral latencies and implications for neural pathways involved in call perception and detection. Brain, Behavior and Evolution 29:196-206.

Ryan, M.J. 1985. Energetic efficiency of vocalization by the frog Physalaemus pustulosus. Journal of Experimental Biology 116:47-52.

Ryan, M.J.; Brenowitz, E.A. 1985. The role of body size, phylogeny, and ambient noise in the evolution of bird song. American Naturalist 126:87-100

Mendonca, M.; Licht, P.; Ryan, M.J.; Barnes, R. 1985. Changes in hormonal level in relation to breeding behavior in male bullfrogs (Rana catesbeiana) at the individual and population levels. General and Comparative Endocrinology 58:270-279.

Tuttle, M.D.; Ryan, M.J,; Bellwood, J. 1985. Acoustical resource partitioning by two phyllostomid bats. Animal Behaviour 33:1369-1371.

Books: Ryan, M.J. 1985. The Túngara Frog, A Study in Sexual Selection and Communication. University of Chicago Press, Chicago. 230 pp.

Ryan, M.J. 1983. Frequency modulated calls and species recognition in a Neotropical frog. Journal of Comparative Physiology 150:217-221.

Ryan, M.J. 1983. Sexual selection and communication in a Neotropical frog, Physalaemus pustulosus. Evolution 39:261-272.

Ryan, M.J.; Bartholomew, G.W.; Rand, A.S. 1983. Reproductive energetics of a Neotropical frog, Physalaemus pustulosus. Ecology 64:1456-1462.

Ryan, M.J.; Tuttle, M.D. 1983. The ability of the frog eating bat to distinguish among palatable and potentially poisonous prey using acoustic cues. Animal Behaviour 31:827-833.

Ryan, M.J.; Tuttle, M.D.; Barclay, R.M.R. 1983. Behavioral responses of the frog-eating bat, Trachops cirrhosus, to sonic frequencies. Journal of Comparative Physiology 150:413-418.

Rand, A.S.; Ryan, M.J.; Troyer, K. 1983. A population explosion in a tropical frog: Hyla rufitela. Biotropica 15:72-73.

Waldman, B.; Ryan, M.J. 1983. Thermal advantages of communal egg deposition in Rana sylvatica. Journal of Herpetology 17:70-72.

Tuttle, M.D.; Taft, L.K.; Ryan, M.J. 1982. Evasive behaviour of a frog in response to bat predation. Animal Behaviour 30:393-397.

Ryan, M.J. 1982. Variation in iguanine social organization: mating systems in chuckwallas (Sauromalus). In: G. Burghardt, A.S. Rand, editors, Iguanas of the World: Their Behavior, Ecology and Conservation. pp. 380-390. Noyes Press, Park Ridge, New Jersey.

Ryan, M.J.; Tuttle, M.D.; Rand, A.S. 1982. Sexual advertisement and bat predation in a Neotropical frog. American Naturalist 119:136-139.

Bucher, T.L.; Ryan, M.J.; Bartholomew, G.W. 1982. Oxygen consumption during resting, calling and nest building in the frog Physalaemus pustulosus. Physiological Zoology 55:10-22.

Tuttle, M.D.; Ryan, M.J. 1982. The roles of synchronized calling, ambient noise, and ambient light in the anti-bat-predator behavior of a treefrog. Behavioral Ecology and Sociobiology 11:125-131.

Tuttle, M.D.; Taft, L.K.; Ryan, M.J. 1982. Acoustical location of calling frogs by philander opossums. Biotropica 13:233-234.

Ryan, M.J.; Tuttle, M.D.; Taft, L.K. 1981. The costs and benefits of frog chorusing behavior. Behavioral Ecology and Sociobiology 8:273-278.

Barclay, R. M. R.; Fenton, B.; Tuttle, M. D.; Ryan, M. J. 1981. Echolocation calls produced by Trachops cirrhosus (Chiroptera: Phyllostomatidae) while hunting for frogs. Canadian Journal of Zoology 59:750-753

Rand, A.S.; Ryan, M.J. 1981. The adaptive significance of a complex vocal repertoire in a Neotropical frog. Zeitschrift fur Tierpsychologie 57:209-214.

Tuttle, M. D.; Ryan, M.J. 1981. Bat predation and the evolution of frog vocalizations in the Neotropics. Science 214:677-678.

Ryan, M.J. 1980. Female mate choice in a Neotropical frog. Science 209:523-525.

Ryan, M.J. 1980. The reproductive behavior of the bullfrog, Rana catesbeiana. Copeia1980:108-114.

Ryan, M.J. 1978. A thermal property of the Rana catesbeiana (Amphibia, Anura, Ranidae) egg mass. Journal of Herpetology 12:295-297.

Ryan, M.J. 1978. Mirror image versus conspecific stimulation in adult male zebra finches. Wilson Bulletin 90:295-297.

Ryan, M.J. 1978. Parental care in salamanders. Bulletin of the New York Herpetological Society 13:23-27.

Anderson, J.D.; Hawthorne, K.; Galandak, J.; Ryan, M. 1978. A report on the endangered reptiles and amphibians of New Jersey. Bulletin of the New Jersey Academy of Science 23:26-33.

Prieto, A.A; Ryan, M.J. 1978. Some observations on the social behavior of the Arizona chuckwalla, Sauromalus obesus tumidus (Reptilia, Lacertilia, Iguanidae). Journal of Herpetology 12:327-336.


 Semester         Course       Unique No.       Title
2014 Fall           BIO 359K      50590            Prin of Animal Behavior

2014 Spr          BIO 438L       50550            Animal Communication
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