Mark Pyron

Mark Pyron

Professor of Biology


Room:FB 204

Related Links: 
Personal Website


University of Oklahoma, Ph.D.
University of North Texas, M.S
University of Wisconsin, B.S.

Research Interests

My research interests are in aquatic ecology of river ecosystems.

Gizzard Shad CPUESpecific Goal: My lab is interested in studying the organisms of river ecosystems. We are interested in identifying attributes of fish assemblages and how they changed the past several decades. One of the major changes in the fish assemblage was a decrease in abundance of Gizzard Shad, a planktivore. At the same time the fishes that consume benthic invertebrates (Freshwater Drum and the sucker species) increased in abundance.

We are studying the food web of the Wabash River with invasive Asian carp that appeared in the 1990s. Our work shows that Silver Carp process phytoplankton in the water column and funnel this material as fecal pellets to benthic organisms.  This appears to have contributed to changes in the food web including increased abundance of benthic invertivore fishes.

Our other major project is a Macrosystems in Ecology project where we are comparing river ecosystems of western North America to Mongolian rivers. This is a collaboration with faculty from the US and Mongolia.

Recent Publications

Backus-Freer, J. and M. Pyron. 2015. Concordance among fish and macroinvertebrate assemblages in streams of Indiana, USA. Hydrobiologia 758:141-150.

Broadway, K.J.,* M. Pyron, J.R. Gammon, and B.A. Murry. 2015. Shift in a large river fish assemblage: body-size and trophic structure dynamics. PLOS ONE DOI:10.1371/journal.pone.0124954.

Jacquemin, S.J., J.C. Doll, M. Pyron, D.A.S. Owen,* and M. Allen. 2014. Effects of flow regime on growth rate in freshwater drum, Aplodinotus grunniens. Environmental Biology of Fishes 98:993-1003.

Ross, B.,* S.J. Jacquemin, and M. Pyron. 2014. Does variation in morphology correspond with variation in habitat use in freshwater gastropods? Hydrobiologia. 736:179-188.

Pyron, M., L. Etchison, and J. Backus. 2014. Fish assemblages of floodplain lakes in the upper Ohio River basin. Northeastern Naturalist 21:419-430.

Jacquemin, S.J., C. Miller,* and M. Pyron. In press. Identifying local scale food web variation using stable δ13 C and δ15 N isotopes in a central Indiana reservoir and downstream river. Proceedings of the Indiana Academy of Science 122:

Etchison, L. and M. Pyron. 2014. Day and night substrate use in six minnow species. American Midland Naturalist 171:321-327.

Jacquemin, S. J., M. Pyron, M. Allen, and L. Etchison. 2014. Wabash River freshwater drum (Aplodinotus grunniens) diet: effects of body size, sex, and river gradient. Journal of Fisheries and Wildlife Management 5:133-140.

Olden, J.D., C.P. Konrad, T.S. Melis, M.J. Kennard, M.C. Freeman, M.C. Mims, E.N. Bray, K.B. Gido, N.P. Hemphill, D.A. Lytle, L.E. McMullen, M. Pyron, C.T. Robinson, J.C. Schmidt, and J.G. Williams. 2014. Are large-scale flow experiments informing the science and management of freshwater ecosystems? Frontiers in Ecology and the Environment 12:176-185.

Rafferty, S.D., J. Lybrook, K.M. Kaczmarek, M. Lethaby, R. Wellington, and M. Pyron. 2013. Assessing changes in the Presque Isle Bay Watershed fish community using a modified index of biotic integrity: before and after the elimination of combined sewer overflows. Environmental Monitoring and Assessment 185:10459-10471.

Jacquemin, S.J. and M. Pyron. 2013. Effects of allometry, sex, and river location on morphological variation of freshwater drum. Copeia 2013:740-749.

Owen, D.A.S.,* A. Settineri,* S.J. Jacquemin, and M. Pyron. 2013. On the contribution of allometry to morphological variation in a freshwater gastropod Elimia livescens. Proceedings of the Indiana Academy of Science 121:163-166.

Pyron, M., T. Pitcher, and S. J. Jacquemin. 2013. Evolution of mating systems in North American Cyprinids. Behavioral Ecology and Sociobiology 67:747-756.

Dillon, R.T., Jr., S. Jacquemin and M. Pyron. 2013. Cryptic phenotypic plasticity in populations of the freshwater prosobranch snail, Pleurocera canaliculata. Hydrobiologia 709:117-127.

Jacquemin, S. J., E. Martin* and M. Pyron. 2013. Morphology of bluntnose minnow Pimephales notatus (Cyprinidae) covaries with habitat in a central Indiana watershed. American Midland Naturalist 169:137-146.

Etchison, L., S.J. Jacquemin and M. Pyron. 2012. Morphological variation of rusty crayfish Orconectes rusticus (Cambaridae) with gender and spatial gradients. International Journal of Biology 4:163-171.

Dunithan, A.,* S. Jacquemin and M. Pyron. 2012. On the covariation of environment and morphology of Elimia livescens (Mollusca) in the Wabash River watershed, USA. American Malacological Bulletin 30:127-133.

Pritchett, J. and M. Pyron. 2012. Fish assemblages respond to habitat and hydrology in the Wabash River, Indiana. River Research and Applications 28:1501-1509.

Konrad, C.P., J.D. Olden, K.B. Gido, N. Hemphill, M.J. Kennard, D.A. Lytle, T.S. Melis, C.T. Robinson, J.C. Schmidt, E. Bray, M.C. Freeman, L. McMullen, M.C. Mims, M. Pyron and J.G. Williams. 2011. Large-scale flow experiments for managing rivers. Bioscience 61:948-959.

Pyron, M., R. Goforth, J. Beugly, S. Morlock and M. Kim. 2011. A GIS approach for explanation of fish assemblage structure in a large river. River Systems 19:239-247.

Pritchett, J. and M. Pyron. 2011. Predicting fish assemblages from substrate variation in a turbid river: grab samples compared with pole probing. North American Journal of Fisheries Management 31:574-579.

Pyron, M., L. Williams, J. Beugly, and S. Jacquemin. 2011. The role of trait-based approaches in understanding stream fish assemblages. Freshwater Biology 56:1579-1592.

Jacquemin, S. J. and M. Pyron. 2011. Fishes of Indiana streams: current and historic assemblage structure. Hydrobiologia 665:39-50.

Jacquemin, S. J. and M. Pyron. 2011. Impacts of glaciation events on contemporary fish assemblages of the Ohio River basin. Journal of Biogeography 38:982-991.

Small, G. E., C. M. Pringle, M. Pyron and J. H. Duff. 2011. Role of the fish Astyanax aeneus (Characidae) as a keystone nutrient recyler in low-nutrient neotropical streams, Costa Rica. Ecology 92:386-397.

Beugly, J. and M. Pyron. 2010. Temporal and spatial variation in the long-term functional organization of fish assemblages in a large river. Hydrobiologia 654:215-226.

Pyron, M., J. Beugly, Pritchett, J., Jacquemin, S., Lauer, T. and J. Gammon. 2010. Long-term fish assemblages of inner bends in a large river. River Research and Applications 27:684-692.

Beugly. J. S. and M. Pyron. 2010. Variation in fish and macroinvertebrate assemblages among seasonal and perennial headwater streams. American Midland Naturalist 163:2-13.

Mueller, R. and M. Pyron. 2010. Fish assemblages and substrates in the middle Wabash River, USA. Copeia 2010:47-53.

Course Schedule
Course No. Section Times Days Location
Readings in Biology 628 115 0000 - 0000
Invertebrate Zoology 432 1 1300 - 1450 M FB, room 246
Invertebrate Zoology 432 1 1500 - 1615 M W FB, room 246
Aquatic Entomology 484 1 1500 - 1650 R FB, room 256
Aquatic Entomology 484 1 1500 - 1650 T FB, room 256