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PUBLICATIONS (1990-present)
Gerhardt, H.C.,
Allan, S. and J.J. Schwartz .1990. Female green treefrogs (Hyla
cinerea) do not
selectively respond to signals with a harmonic structure in noise.
Journal
of Comparative Physiology A 166: 791-794.
Hausfater, G.,
Gerhardt, H.C. and G. M. Klump. 1990. Parasites and mate choice
in gray treefrogs, Hyla versicolor. American
Zoologist 30: 299-311.
Jřrgensen, M. B.
and H.C. Gerhardt. 1991. Directional hearing in the gray treefrog
Hyla
versicolor: eardrum vibrations and phonotaxis.
Journal of Comparative
Physiology A
169: 177-183.
Gerhardt, H.C.
1991. Female mate choice in treefrogs: static and dynamic acoustic
criteria. Animal Behaviour 42: 615-635.
McGregor, P.K.,
Catchpole, C.K., Dabelsteen, T., Falls, J.B., Fusani, L., Gerhardt,
H.C., Gilbert, F., Horn, A.G., Klump,
G.M., Kroodsma, D.E., Lambrechts, M.M.,
McComb, K.E., Nelson, D.A., Pepperberg,
I.M., Ratcliffe, L., Searcy, W.A. and
Weary, D.M. 1992. Design of playback
experiments: the Thornbridge Hall
consensus. In: Playback and Studies of Animal Communication: Problems and Prospects.
NATO
Advanced Research Workshop (P. MacGregor
ed.), pp. 1-9, N.Y.: Plenum Press.
Gerhardt, H.C.
1992. Conducting playback experiments and interpreting their
results. In: Playback and Studies of Animal Communication: Problems and Prospects.
NATO
Advanced Research Workshop (P. MacGregor
ed.), pp. 59-77, N.Y.: Plenum Press.
Klump, G.M. and
H.C. Gerhardt. 1992. Mechanisms and function of call-timing in
male-male
interactions in frogs. In:
Playback
and Studies of Animal Communication:Problems
and Prospects.
NATO Advanced
Research Workshop (P. MacGregor, ed.),
pp 153-174. N.Y.:
Plenum Press
Diekamp, B.M.
and H.C. Gerhardt. 1992. Midbrain auditory sensitivity in the spring
peeper (Pseudacris crucifer): correlations with behavioral studies.
Journal of
Comparative
Physiology A 171: 245-250.
Gerhardt, H.C.
1992. Multiple messages in acoustic signals.
Seminars in the
Neurosciences 4: 391-400.
Gerhardt, H.C.
1993. Multiple causation of the evolution of acoustic signals used in
courtship. Etología 1993 (3): 175-193. Appeared in 1994.
Gerhardt, H.C.,
Ptacek, M. B., Barnett, L., and K.G. Torke. 1994. Hybridization
between the diploid-tetraploid treefrogs Hyla chrysoscelis and Hyla
versicolor. Copeia 1994: 51-59.
Gerhardt, H.C.
1994. Reproductive character displacement of female mate choice in the grey
treefrog Hyla chrysoscelis. Animal
Behaviour 47: 959-969.
Gerhardt, H.C.,
Dyson, M. L., Tanner, S. D. and C. G. Murphy. 1994. Female treefrogs do not
avoid heterospecific calls during
phonotactic approaches to conspecific calls: implications for
mechanisms of mate choice. Animal Behaviour 47: 1323-1332.
Breden, F.,
Gerhardt, H. C., and R. K. Butlin. 1994. Female choice and genetic
correlations. Trends in Ecology and Evolution 9: 343.
Gerhardt, H.C.
1994. Evolution of vocalization in frogs and toads.
Annual Reviews
of
Ecology and Systematics 25: 293-324.
Ptacek, M.B.,
Gerhardt, H.C. and R.D. Sage. 1994. Speciation by polyploidy and
multiple origins of the tetraploid gray treefrog Hyla versicolor. Evolution
48:
898-908.
Gerhardt, H.C.
1994. Selective responsiveness to long-range acoustic signals in
insects and anurans. American Zoologist 34: 706-714.
Gerhardt, H.C.
1995. Phonotaxis in female frogs and toads: execution and design
of experiments. In: Animal Psychophysics: Design and Conduct of Sensory Experiments (G.
M.
Klump, R.R. Dooling, R.R. Fay & W.C.
Stebbins, eds.)., pp. 209-220. Basel:
Birkhäuser Verlag.
Gerhardt, H.C.
and J.J. Schwartz. 1995. Interspecific interactions in anuran
courtship. In: Amphibian Biology: Social Behaviour (H. Heatwole & B.K.
Sullivan,
Eds.),
pp. 603-632. Chipping-Norton (Sydney): Surrey Beatty & Sons.
Diekamp, B.M.
and Gerhardt, H.C. 1995. Behavioral and neurophysiological studies
of acoustic communication in the gray
treefrog Hyla versicolor.
Journal of
Comparative Physiology A 177: 173-190.
Gerhardt, H.C.
and G.F. Watson. 1995. Within-male variability in call properties and
female
choice in the grey treefrog. Animal
Behaviour 50: 1187-1191.
Schwartz, J.J.
and H.C. Gerhardt. 1995. Directionality of the auditory system and
call pattern discrimination during
acoustic interference in the gray treefrog
Hyla
versicolor. Auditory Neuroscience 1: 195-206.
Gerhardt, H.C.,
Dyson, M.L., and S.D. Tanner. 1996. Dynamic properties of the
advertisement calls of gray treefrogs:
patterns of variability and female choice.
Behavioral
Ecology 7: 7-18.
Murphy, C.G. and
H.C. Gerhardt. 1996. Evaluating experimental designs for
determining mate choice: the effect of amplexus
on mate choice by barking
treefrogs. Animal Behaviour 51: 881-890.
Watson, G.F. and
H. C. Gerhardt. 1997. The breeding biology and advertisement
call of Litoria
splendida Tyler, Davies and Martin.
Transactions
of the Royal Society of South
Australia. 121: 119-124.
Gerhardt, H.C.
1998. Acoustic signals of animals: field measurements, recording, analysis
and description. In: Techniques in the Study of Animal Communication by Sound (Hopp, S.
&
M. Owren, eds.), pp. 1-25. Berlin,
Heideberg: Springer Verlag.
Schwartz, J.J.
and H.C. Gerhardt. 1998. The
neuroethology of call preferences in the
spring peeper. Animal Behaviour 56: 55-69.
Welch, A.,
Semlitsch, R.L., and H. C. Gerhardt. 1998. Call duration as an indicator of
genetic quality in male gray treefrogs. Science 280: 1928-1930.
Welch,
A. M., R. D. Semlitsch and H. C. Gerhardt. 1998. The handy-dandy kitchen
device–Response. Science 282: 1994.
Walkowiak, W.,
Berlinger, M., Schul, J. and H. C. Gerhardt. 1999. Significance of forebrain
structures in
acoustically guided behavior in anurans. European
Journal of Morphology 37: 116-120.
Krenz, J., Semlitsch, R.D.,
Gerhardt, H.C. and P.A. Mahoney. 1999. Isolation and characterization
of simple sequence repeat loci in the gray treefrog, Hyla chrysoscelis. Genome 42: 1-6.
Gerhardt, H.C. and J. Schul.
1999. A quantitative analysis of behavioral selectivity for pulse-rise
time in the gray treefrog, Hyla
versicolor. Journal of Comparative
Physiology A 185: 33-40.
Gerhardt, H.C.
1999. Reproductive character displacement and other sources of
environmental
selection on acoustic communication systems. In:
The Design of Animal
Communication (Hauser, M. and
M. Konishi, eds.), pp. 515-534. Cambridge:
MIT Press.
Murphy, C.G. and H.C.
Gerhardt. 2000. Preference functions of individual female barking
treefrogs, Hyla gratiosa.
Evolution 54: 660-669.
Gerhardt, H.C., Roberts,
J.D., Bee, M.A. and J.J. Schwartz. 2000. Call matching in the quacking
frog (Crinia georgiana). Behavioral Ecology and Sociobiology
48: 243-251.
Gerhardt, H.C., Tanner,
S.D., Corrigan, C.M. and H.C. Walton. 2000. Female preference functions
based on call duration in the gray treefrog (Hyla versicolor). Behavioral Ecology 11: 663-669.
Bee, Mark A., Kozich, C.E.,
Blackwell, K.J. and H. C. Gerhardt. 2001. Individual variation
in advertisement calls of territorial male green frogs, Rana clamitans: implications for
individual discrimination. Ethology
107: 1-21.
Keller, M. D. and H. C. Gerhardt.
2001. Polyploidy affects call structure in gray treefrogs.
Proceedings of the Royal
Society (London), Series B 268: 341-345.
Gerhardt, H.C. 2001.
Acoustic communication in two groups of closely related treefrogs. Advances
in Behavioral Biology (Slater, P.J.B.,
Rosenblatt, J.S., Snowdon, C.T. and T. J. Roper, eds.),
pp. 99-167. New York: Academic Press.
Bee,
M. A. and H.C. Gerhardt. 2001. Habituation as a mechanism of reduced aggression
between
neighboring territorial male bullfrogs, Rana catesbeiana. Journal of Comparative Psychology,
115: 68-82.
Gerhardt, H.C. and J.J.
Schwartz. 2001. Auditory tuning and frequency preferences in anurans. In:
Anuran Communication (Ryan, M.J., ed), pp.
73-85. Washington: Smithsonian Institution Press.
Gerhardt, H.C. 2001.
Acoustic communication in frogs and toads. In: Model Systems in Behavioral
Ecology (Dugatkin, L., ed.), pp.
169-190. Princeton: Princeton University Press.
Schwartz, J.J., Buchanan, B. and H.C.
Gerhardt. 2001. Female mate choice in the gray
treefrog (Hyla
versicolor) in three experimental environments.
Behavioral
Ecology and
Sociobiology 49: 443-455.
Bee,
M.A. and H. C. Gerhardt. 2001. Individual discrimination by territorial male
bullfrogs
(Rana
catesbeiana): I. Individual variation in advertisement calls. Animal
Behaviour 62:
1129-1140.
Bee,
M.A. and H. C. Gerhardt. 2001. Individual discrimination by territorial male
bullfrogs
(Rana
catesbeiana): II. Perceptual mechanisms. Animal Behaviour 62: 1141-1150.
Bush,
S.L., Gerhardt, H.C. and J. Schul. 2002. Pattern recognition and call
preferences in
treefrogs (Anura: Hylidae): a quantitative
analysis using a no-choice paradigm.
Animal Behaviour 63: 7-14.
Bee, M.A. and H.C. Gerhardt.
2002. Individual voice recognition in a territorial frog (Rana
catesbeiana). Proceedings of the Royal
Society of London Series B 269: 1443-1448.
Murphy, C.G. and H.C. Gerhardt. 2002. Mate-sampling
by female barking treefrogs (Hyla
gratiosa). Behavioral Ecology 13: 472-480.
Gerhardt, H.C. and Franz
Huber. 2002.
Acoustic Communication in
Insects and Frogs:
Common Problems and Diverse
Solutions.
Chicago: University of Chicago Press.
Gerhardt, H.C. 2002. Sexual
dimorphism. In: Encyclopedia of Evolution
(Pagel, Mark, ed.).
Oxford: Oxford University Press
Gerhardt, H.C. 2002. Neuroethology of sound communication in anurans (frogs and toads). In:
Encyclopedia of
Neuroscience (G. Adelman and B. H. Smith, eds.). Oxford: Oxford
University Press, published on-line
Schwartz, J.J., Buchanan,
B.W. and H.C. Gerhardt. 2002. Acoustic interactions among male
gray treefrogs, Hyla
versicolor, in a chorus setting. Behavioral
Ecology & Sociobiology
53: 9-19
Höbel, G. and H.C. Gerhardt.
2003. Reproductive character displacement in the acoustic
communication system of green treefrogs (Hyla cinerea). Evolution
57: 894-904.
Endepols, H., Feng, A.S.,
Gerhardt, H.C., Schul, J. and W. Walkowiak. 2003. Roles of the auditory
midbrain and thalamus in selective phonotaxis in female gray
treefrogs (Hyla versicolor).
Behavioral Brain Research
145: 53-77.
Gerhardt, H. C. 2003. Animal
communication.
Journal of the Acoustical
Society of America
114: 578. Book Review.
Endepols,
H., Schul, J., Gerhardt, H.C. and W. Walkowiak. 2004. 6-Hydroxydopamine lesions
in
anuran amphibians: A new model system for
Parkinson’s disease? Behavioral
Neurobiology
60: 395-410.
Gerhardt, H.C. 2004. Chorusing in frogs. In:
Encyclopedia of Animal Behavior (Marc Bekoff,
ed), pp. 383-385. Greenwood Press, Westport CT
Klump, G.M., Benedix, Jr. J.H., Gerhardt,
H.C. and P. M. Narins. 2004. AM-representation in
green treefrog auditory-nerve fibers: neuroethological implications for
pattern recognition
and sound localization. Journal of Comparative Physiology A
190:1011–1021.
Gerhardt H. C. 2005. Acoustic spectral
preferences in two cryptic species of
gray treefrogs: implications for mate choice and sensory mechanisms. Animal Behaviour 70: 39-49.
Gerhardt H. C. 2005.
Advertisement-call
preferences in diploid-tetraploid treefrogs (Hyla
chrysoscelis
and Hyla versicolor): implications
for mate choice and the evolution of
communication systems. Evolution, 59:395-408.
Gerhardt,
H. C. and G. Höbel. 2005. Mid-frequency suppression in the green treefrog (Hyla
cinerea):
implications for mechanisms and the evolution of acoustic communication. Journal
of Comparative Physiology A,
191:707-714.
Jang, Y. and H. C. Gerhardt. 2006. Divergence in the calling songs between sympatric and
allopatric populations of the southern wood cricket Gryllus fultoni (Orthoptera: Gryllidae).
Journal of Evolutionary Biology 19: 459-472.
Holloway, A. K., Cannatella, D.C., Gerhardt, H.C. and D.M. Hillis. 2006. Polyploids with
different origins and ancestors form a single sexual polyploidy species. American Naturalist
167: E88-E101.
Marshall, V.T., Schwartz, J.J. and H. C. Gerhardt. 2006. The effects of cross-species
advertisement call overlap on signal discrimination and phonotactic behaviour of grey treefrogs
Animal Behaviour 72: 449-459.
Robillard, T., Höbel, G. and H. C. Gerhardt. 2006. Evolution of advertisement signals in North
American hylid frogs: vocalizations as end-products of calling behavior. Cladistics 22: 1-13.
Gerhardt, H.C. and Mark A. Bee. 2006. Recognition and localization of acoustic signals. In:
Hearing and Sound Communication in Amphibians (Ed: Feng, Narins, Popper & Fay, pp. 113-
146. New York: Springer Verlag.
Jang, Y. and H. C. Gerhardt. 2006. Divergence in female calling song discrimination between
sympatric and allopatric populations of the southern wood cricket Gryllus fultoni (Orthoptera:
Gryllidae). Behavioral Ecology and Sociobiology 60:150-158..
Jang, Y. and H. C. Gerhardt. 2007. Differential temperature effects on calling songs between
allopatric and sympatric populations of Gryllus fultoni (Orthoptera: Gryllidae). J. Insect
Behavior 20: 33-52.
Gerhardt, H.C., Humfeld, S.C. and V.T. Marshall. 2007. Temporal order and the evolution of
complex acoustic signals. Proceedings of the Royal Society London B 274: 1789-1794.
Gerhardt, H.C., Martinez-Rivera, C.C., Schwartz, J.J., Marshall, V.T. and C.G. Murphy. 2007
Preferences based on spectral differences in acoustic signals in four species of treefrogs.
Journal
of Experimental Biology 210: 2990-2998.
Jang, Y., Bockhorst, A. and H. C. Gerhardt. 2007. Reproductive isolation in the wood cricket
Gryllus vernalis (Orthoptera: Gryllidae). Ethology, 113: 87-96.
Gerhardt, H. C., Humfeld, S. C, and V. T. Marshall. 2007. Temporal order and the evolution of
complex acoustic signals. Proceedings of the Royal Society of London, Part B 274: 1789-1794.
Gerhardt, H. C., Martinez-Rivera, C.C., Schwartz, J.J., Marshall, V.T. and C.G. Murphy. 2007.
Preferences based on spectral differences in acoustic signals in four species of treefrogs. Journal
of Experimental Biology 210: 2990-2998.
Höbel, G. and H. C. Gerhardt. 2007. Sources of selection on signal timing in a tree frog.
Ethology 113: 773-782.
Jang, Y., Gerhardt, H.C. and J. Choe. 2008. A comparative study of aggressiveness in eastern
North American field cricket species (Genus Gryllus). Behavioral Ecology and Sociobiology,
62: 1397-1407.
Gerhardt, H. C. 2008. Phonotactic selectivity in two cryptic species of gray treefrogs: effects of
differences in pulse-rate, carrier frequency, and playback level. Journal of Experimental Biology,
in press.
Martínez-Rivera, C.C. & H. C. Gerhardt. 2008. Advertisement-call modification and female
preference in the bird-voiced treefrog, Hyla avivoca. Behavioral Ecology and Sociobiology
63: 195-208.
Gordon, N.M. & H.C. Gerhardt. 2009. Hormonal modulation of phonotaxis and advertisement-
call preferences in the gray treefrog (Hyla versicolor). Hormones & Behavior, in press.
Elliott, L., Gerhardt, H.C. & Carlos Davidson. 2008. Frogs and Toads of North America: A
Comprehensive Guide to their Identification, Behavior and Calls. Houghton-Mifflin.