Professor of Biological Sciences
PhD, 1994 Philipps-University Marburg (Germany)
Evolution and neuroethology of acoustic communication systems in insects and amphibians
Research descriptionMy research uses the acoustic communication system in tettigoniids (“katydids”) and treefrogs as a model system to study two research problems:
1. Neuronal basis of pattern recognition processes. Acoustic communication in tettigoniids is a premier system for studying pattern recognition mechanisms for several reasons: (1) the auditory sensory system comprises a relatively small number of neurons, which are easily accessible for neurophysiological experiments, both in immobilized and behaving animals; (2) pattern recognition can be quantified at the systems level using well established behavioral methods; and (3) both call production and call recognition are unlearned, largely genetically determined behaviors.
2. The evolution of novel traits. The extensive diversity of communication signals within taxonomic groups makes them an excellent system to study one of the most intriguing questions of evolutionary biology, namely, how do novel traits evolve? Because communication systems consist of two subunits, sender and receiver, which need to be reciprocally matched for the system to function, their rapid diversification remains an open and controversial problem. We focus on the evolution of call recognition mechanisms.
Consideration of these two problems together will have a synergistic effect, deepening our understanding of both the evolutionary and neurobiological issues in communication. With respect to the neurobiological question my goal is to understand the pattern recognition processes not only at a proximate level (i.e. how neurons and their connections function), but also at an ultimate level (i.e. whether the identified neuronal traits are adaptive, caused by constraints, or are epi-phenomena of other traits). With respect to the evolutionary question, my goal is to understand the processes leading to the diversity of communication systems, from the evolutionary forces causing them, to the cellular and sub-cellular changes in the nervous system occurring during the diversification of call recognition and signal production. The combination of neurobiological and evolutionary approaches will generate a better understanding in both fields than either approach would alone. I am convinced that our ‘two-pronged’ approach will lead to a comprehensive understanding of the interdependence of sensory systems and the evolution of communication systems, and so advance both fields.
Christie, K.W., Schul, J., Feng, A.S. Differential effects of sound level and temporal structure of calls on phonotaxis by female gray treefrogs, Hyla versicolor (2019) Journal of Comparative Physiology A: Neuroethology, Sensory, Neural, and Behavioral Physiology, . DOI: 10.1007/s00359-019-01325-5
Friedrichsen, P.J., Brown, L.G., Schul, J. Project teach evolution: Preparing biology pre-service teachers to teach evolution in Missouri, U.S.A. (2018) Evolution Education Around the Globe, pp. 41-58. DOI: 10.1007/978-3-319-90939-4_3
Murphy, M.A., Schul, J. Does leadership indicate male quality in Neoconocephalus katydids? (2017) Behavioral Ecology and Sociobiology, 71 (1), art. no. 22,
Heise, D., Miller-Struttmann, N., Galen, C., Schul, J. Acoustic detection of bees in the field using CASA with focal templates (2017) SAS 2017 - 2017 IEEE Sensors Applications Symposium, Proceedings, art. no. 7894089,
Miller-Struttmann, N.E., Heise, D., Schul, J., Geib, J.C., Galen, C. Flight of the bumble bee: Buzzes predict pollination services (2017) PLoS ONE, 12 (6), art. no. e0179273,
Strauß, J., Alt, J.A., Ekschmitt, K., Schul, J., Lakes-Harlan, R. Evolutionary diversification of the auditory organ sensilla in Neoconocephalus katydids (Orthoptera: Tettigoniidae) correlates with acoustic signal diversification over phylogenetic relatedness and life history (2017) Journal of Evolutionary Biology, 30 (6), pp. 1094-1109.
Ney, G., Schul, J. Population structure within the one-dimensional range of a coastal plain katydid (2017) PLoS ONE, 12 (6), art. no. e0179361,
Ney, G., Schul, J. Low genetic differentiation between populations of an endemic prairie katydid despite habitat loss and fragmentation (2017) Conservation Genetics, pp. 1-13. Article in Press.
Murphy, M.A., Gerhardt, H.C., Schul, J. Leader preference in Neoconocephalus ensiger katydids: a female preference for a nonheritable male trait (2017) Journal of Evolutionary Biology, 30 (12), pp. 2222-2229. DOI: 10.1111/jeb.13188
Murphy MA, Thompson NL, Schul J: Keeping up with the neighbor: a novel mechanism of call synchrony in Neoconocephalus ensiger katydids. Journal of Comparative Physiology A: Neuroethology, Sensory, Neural, and Behavioral Physiology 2016, 202(3):225-234.
Kong XL, Peck AS, Bush SL, Schul J: The Diversity of Call Recognition: Selective Phonotaxis in Neoconocephalus ensiger. Journal of Insect Behavior 2015, 28(6):651-663.
Prešern J, Triblehorn JD, Schul J: Dynamic dendritic compartmentalization underlies stimulus-specific adaptation in an insect neuron. Journal of Neurophysiology 2015, 113(10):3787-3797.
Triblehorn JD, Schul J: Dendritic mechanisms contribute to stimulus-specific adaptation in an insect neuron. Journal of Neurophysiology , 2013, 110:2217-2216.
Schul J, Mayo AM, Triblehorn, JD: Auditory change detection by a single neuron in an insect. Journal of Comparative Physiology A 2012, 198:695-704
Honors & Awards
Selected honors and awards
UM President’s Award for Innovative Teaching 2019
Fellow, American Association for the Advancement of Science 2018
Summer Institutes on Scientific Teaching Fellow (Yale University, Center for Teaching & Learning) 2017
March 29, 2019
Professor Schul honored for innovative teaching
Nov. 27, 2018
Johannes Schul named AAAS Fellow
June 20, 2018
Johannes Schul is co-PI on $1 million HHMI grant to boost diversity in the natural sciences
June 20, 2018
Feb. 16, 2017
Professors Schul and Bush Lead Campus-Wide STEM Education Effort
Jan. 27, 2016
Call preferences of female N. ensiger katydids
Jan. 13, 2016