Teresa Lozano Long Institute of Latin American Studies
Teresa Lozano Long Institute of Latin American Studies

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


UGS 302 • Sex In The Wild-W

64765 • Fall 2009
Meets TTH 11:30AM-1:00PM PAT 141

The Signature Course (UGS 302 and 303) introduces first-year students to the university’s academic community through the exploration of new interests. The Signature Course is your opportunity to engage in college-level thinking and learning.


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.


Ryan Lab, School of Biological Sciences


 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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