Macalester College

Prof. Dan HornbachDan Hornbach

John S. Holl Professor of Environmental Studies and Biology

Teaching Interests:  My interests include areas of both Biology and Environmental Science. I the past I have taught Ecology, Invertebrate Biology, Physiological Ecology and Introductory Biology. More recently my courses have included Aquatic Ecology, Environmental Science and Lakes, Streams and Rivers.

Research Interests:  I was broadly trained in the area of organismal biology and ecology. My recent research has been dealing with the biology and ecology of freshwater mussels in river systems. In general, I am interested in exploring the factors that influence the distribution and abundance of these animals. In our current world, this includes examining human impacts on the rivers that may influence the mussels that reside there. As part of my research, I become involved in the conservation of endangered species of mussels. As a group, mussels are one of the most endangered groups in North America.

Selected Recent Publications:

Beekey, MA and D.J. Hornbach. 2004. The effect of size-limited brood size in a freshwater bivalve. American Midland Naturalist 151: 274-285.

Allen,* D.C., M.C. Hove, B.E. Sietman, Mike Davis, D.E. Kelner, Jennifer E. Kurth, Jeffrey L. Weiss, and D.J. Hornbach. 2007. Aspects of reproductive biology and conservation status of Venustaconcha ellipsiformis (Bivalvia: Unionidae) in Minnesota.  American Midland Naturalist 157: 74-91.

Hornbach, D.J. and C.M. Way. 2007. Ecology: Population Dynamics, Energetics and Production, pp. 126-128. IN G.L. Mackie. Biology of Freshwater Corbiculid and Sphaeriid Clams of North America. Ohio Biological Survey Bulletin, New Series, Volume XV, Number 3. Columbus, Ohio.

Baker, S.M. and D.J. Hornbach. 2008. Zebra mussels (Dreissena polymorpha) attached to native mussels (Unionidae) or inanimate substrates: Comparison of physiological rates and biochemical composition. American Midland Naturalist 160:20-28.

Hornbach, D.J., M.C. Hove, B. Dickinson*, K. MacGregor and J.R. Medland. 2010. Estimating population size and habitat associations of two federally endangered mussels in the St. Croix River, Minnesota and Wisconsin, USA. Aquatic Conservation: Marine and Freshwater Ecosystems 20: 250-260.

Hornbach, D.J. V.J. Kurth*, and M.C. Hove. 2010. Variation in freshwater mussel shell sculpture and shape along a river gradient. American Midland Naturalist 164:22-36.

Hove, M.C., B.E. Sietman, J.E. Bakelaar, J.A. Bury, D.J. Heath, V.E. Pepi, J.E. Kurth, J.M. Davis, D.J. Hornbach and A. R. Kapuscinski. 2011. Early Life History and Distribution of Pistolgrip (Tritogonia verrucosa (Rafinesque, 1820)) in Minnesota and Wisconsin. American Midland Naturalist 165:338-354.

Bowne, D.R., A.L. Downing, M.F. Hoopes, K. LoGiudice, C.L. Thomas, L.J. Anderson, T. Gartner, D.J. Hornbach, K.Kuers, J. Machado, B.R. Pohlad and K. L. Shea. 2011. Transforming ecological science at primarily undergraduate institutions through collaborative networks. BioScience 61:386-392.

Panahbehagh, B., D.R. Smith, M. Salehi, D.J. Hornbach, and J.A. Brown. 2011. Multi-species attributes as the condition for adaptive sampling of rare species using two-stage sequential sampling with an auxiliary variable, pp. 2093-2099 In Chan, F., D. Marinova, and R.S. Anderssen (eds.) MODSIM2011, 19th International Congress on Modelling and Simulation. Modelling and Simulation Society of Australia and New Zealand, December 2011. (ISBN: 978-0-9872143-1-7)

Szumowski*, S.C., S.L. Boyer, D.J. Hornbach and M.C. Hove. 2012. Genetic diversity of two common freshwater mussel species, Lampsilis cardium and Quadrula pustulosa (Bivalvia, Unionidae), in a large federally protected waterway (St. Croix River, Minnesota/Wisconsin, U.S.A.). American Malacological Bulletin 30: 1-14.

Hove, M.C., M. T. Steingraeber, T. J. Newton, D. J. Heath, C. L. Nelson, J. A. Bury, J. E. Kurth, M. R. Bartsch, W. S. Thorpe, M. R. McGill, and D. J. Hornbach. 2012. Early life history of the winged mapleleaf mussel (Quadrula fragosa). American Malacological Bulletin 30: 47–57

Sansom. B.J.*, D.J. Hornbach, M.C. Hove, and J.S. Kilgore. 2013. Effects of flow restoration on mussel growth in a Wild and Scenic River North American River. Aquatic Biosystems 9: 6 (11 pages).

Hornbach, D.J. M.C. Hove, H. Liu*, F.R. Schenck*, D. Rubin* and B.J. Sansom*. 2014. The influence of two differently sized dams on mussel assemblages and growth. Hydrobiologia : 724: 279-291.

Simmons, J.A., M. Anderson, W. Dress, C. Hannac, D.J. Hornbach, A. Janmaat, F. Kuserk, J. G. March, T. Murray, J. Niedzwiecki, D. Panvini, B. Pohlad, C. Thomas, and L. Vasseurk. 2014. A comparison of the stream temperature regime under forested and non-forested riparian 4 zones at eleven sites across North America. River Research and Applications 31: 964-974. DOI: 10.1002/rra.2796.

Hornbach, D.J., R. Beckel*, E.N. Hustad*, D.P. McAdam*, I.M. Roen*, and A.J. Wareham*. 2015. The influence of riparian vegetation and season on stream metabolism of Valley Creek, Minnesota. Journal of Freshwater Ecology 30: 569-588.

Hansen, A.T., J. A. Czuba, J. Schwenk, A. Longjas, M. Danesh-Yazdi, D. J. Hornbach and E. Foufoula-Georgiou. 2016. Coupling freshwater mussel ecology and river dynamics using a simplified dynamic interaction model. Freshwater Science 35: 200–215.

Hove, M., B. Sietman, M. Berg, E. Frost, K. Wolf, T. Brady, S. Boyer and D. Hornbach. 2016. Early life history of the sheepnose (Plethobasus cyphyus) (Mollusca: Bivalvia: Unionoida). Journal of Natural History 50: 523-542.

Hornbach, D., M Hove, M. Agata*, E. Arnold*, E. Cavazos*, C. Friedman*, K. Jay*, E. Johnson*, K. Johnson*, and A. Staudenmaier. 2016. Ecosystem Structure and Function in two branches of an eastern Minnesota trout stream. Journal of Freshwater Ecology 31: 487-507.

* indicates student co-authors

My CV is available as a PDF document here.