Recent Publications

Gannon, K. A., Newman, R., Thum, R. (in press). Integrating DNA fingerprinting of invasive watermilfoil strains into aquatic vegetation monitoring and assessment. Journal of Aquatic Plant Management.

Wersal, R. M., Madsen, J. D., Thum, R., Welch, M., Phuntumart, V., Schmid, S. A. (2021). The identification of watermilfoil, discovery of hybrid watermilfoil, and their implications for aquatic plant management in the Clark Fork River, western MT, USA. Journal of Freshwater Ecology, 36(1), 111-124.  

Harms, N. E., Thum, R., Gettys, L. A., Markovich, I. J., French, A., Simantel, L., Richardson, R. (2021). Hybridization between native and invasive Nymphoides species in the United States. Biological Invasions, 23, 3003–3011.

Jones, A., Thum, R. (2021). Molecular confirmation of hybridization with invasive curly-leaf pondweed (Potamogeton crispus) in the Sacramento-San Joaquin Delta, California. Journal of Aquatic Plant Management, 59, 1-6.

Ortiz, M., Nissen, S., Thum, R., Heilman, M., Dayan, F. (2020). Current status and future prospects of herbicide for aquatic weed management. Outlooks on Pest Management, 31(6), 270-275.

Chorak, G., Thum, R. (2020). Identification of resistant clones of Eurasian (Myriophyllum spicatum) and hybrid (M. spicatum X M. sibricum) watermilfoil to an operational rate of fluridone. Invasive Plant Science and Management, 13(4), 247-251.

Thum, R., Chorak, G. M., Newman, R. M., Eltawely, J. A., Latimore, J., Elgin, E., Parks, S. (2020) Genetic diversity and differentiation in populations of invasive Eurasian (Myriophyllyum spicatum) and hybrid (M. spicatum × M. sibiricum) watermilfoil. Invasive Plant Science and Management. https://doi.org/10.1017/inp.2020.12

Eltawely, J. A., Newman, R. M., Thum, R. (2020) Factors influencing the distribution of invasive hybrid (Myriophyllum spicatum x M. sibiricum) watermilfoil and parental taxa in Minnesota. Diversity. https://doi.org/10.3390/d12030120

Thum, R. A., Chorak, G. M. Herbicide resistance and resistance management of aquatic plants. Book chapter submitted for Biology and Control of Aquatic Plants, 4th ed. Ed. Gettys, L.

Canavan, K., Canavan, S., Harms, N. E., Lambertini, C., Paterson, I., Thum, R. (2020) The potential for biological control on cryptic plant invasions. Biological Control, 144, Article 104243. https://doi.org/10.1016/j.biocontrol.2020.104243

Dumke, J. D., Chorak, G. M., Ruetz, C. R., Thum, R., Wesolek, J. N. (2020) Identification of Black Bullhead (Ameiurus melas) and Brown Bullhead (A. nebulosus) from the Western Great Lakes: Recommendations for Small Individuals. American Midland Naturalist, 183(1), 90-104. https://doi.org/10.1637/19-041

Pashnick, J., Thum, R. (2020) Comparison of molecular markers to distinguish genotypes of Eurasian watermilfoil, northern watermilfoil, and their hybrids. Journal of Aquatic Plant Management, 58, 61-66.

Chorak, G., Ruetz, C., Thum, R., Partridge, C., Janetski, D., Höök, T., Clapp, D. (2019) Yellow perch genetic structure and habitat use among connected habitats in eastern Lake Michigan. Ecology and Evolution, 9, 8922–8932. https://doi.org/10.5061/dryad.2444ck7

Chorak, G. M., Dodd, L., Rybicki, N., Ingram, K., Buyukyoruk, M., Kadono, Y., Chen, Y. Y., Thum, R. A. (2019) Cryptic introduction of water chestnut (Trapa) in the northeastern United States. Aquatic Botany: 155, 32-27. https://doi.org/10.1016/j.aquabot.2019.02.006

Thum, R. A., McNair, J. N. (2018) Inter- and intraspecific hybridization affects vegetative growth and invasiveness in Eurasian watermilfoil. Journal of Aquatic Plant Management 56, 24-30.

Guastello, P. R., Thum, R. (2018) Mesocosm and field evaluation of Eurasian and hybrid watermilfoil response to endothall in Jefferson Slough, Montana. Journal of Aquatic Plant Management, 56, 63-67.

Thum, R. (2018) Genetic variation and aquatic plant management: key concepts and practical implications. Journal of Aquatic Plant Management, 56S, 101-106.

Thum, R., Parks, S., McNair, J. N., Tyning, P., Hausler, P., Chadderton, L., Tucker, A., Monfils, A. (2017) Survival and vegetative regrowth of Eurasian and hybrid watermilfoil following operational treatment with auxinic herbicides in Gun Lake, Michigan, USA. Journal of Aquatic Plant Management, 55, 103-107. 

Taylor, L.A., McNair, J. N., Guastello, P., Pashnick, J., Thum, R.A. (2017) Heritable variation for vegetative growth rate in ten distinct genotypes of hybrid watermilfoil. Journal of Aquatic Plant Management, 55, 51-57. 

 

Older Publications

Parks, S., McNair, J. N., Hausler, P., Tyning, P., Thum, R. A. (2016) Divergent responses of cryptic invasive watermilfoils to treatment with auxinic herbicides in a large Michigan Lake. Lake and Reservoir Management, 32, 366–372. https://doi.org/10.1080/10402381.2016.1212955

Moody, M. L., Palomino, P. S., Weyl, P.S., Coetzee, J. A., Newman, R. M., Liu, X., Xu, X., Harms, N., Thum, R.A. (2016) Unraveling the Bieogeographic History of the Eurasian Watermilfoil Invasion in North America. American Journal of Botany, 103, 709-718. https://doi.org/10.3732/ajb.1500476

Weyl, P.S., Thum, R.A., Moody, M. L., Newman, R. M., Coetzee, J. A. (2016) Was Myriophyllum spicatum L. (Haloragaceae) recently introduced to South Africa from Eurasia? Aquatic Botany 128: 7-12. https://doi.org/10.1016/j.aquabot.2015.09.003

Newton, J., Sepulveda, A., Sylvester, K., Thum, R.A. (2016) Potential utility of environmental DNA for early detection of Eurasian watermilfoil (Myriophyllum spicatum). Journal of Aquatic Plant Management 54: 46-49. 

Homola, J., Ruetz III, C., Kohler, S., Thum, R.A. (2016) Complex post-glacial recolonization inferred from a sedentary fish: mottled sculpin Cottus bairdii in western Michigan, U.S.A. rivers. Journal of Fish Biology, 89, 2234–2250. https://doi.org/10.1111/jfb.13101

Borrowman, K., Sager, E., Thum, R. (2015) Growth and developmental performance of the milfoil weevil on distinct lineages of Eurasian watermilfoil and northern x Eurasian hybrid. Journal of Aquatic Plant Management 53: 81-87. 

Parks, S., Thum, R. A., Pashnick, J., Tyning, P., Huberty, L. (2014) Incorporating genetic identifications of watermilfoils into aquatic vegetation mapping to inform management decisions. The Michigan Riparian 49: 22-25.

Homola, J., Ruetz III, C., Kohler, S., Thum, R. A. (2014) Weak effects of a microsporidian parasite on mottled sculpin in Michigan streams. Canadian Journal of Fisheries and Aquatic Sciences 71: 915-926. https://www.nrcresearchpress.com/doi/pdf/10.1139/cjfas-2013-0545

Borrowman, K., Sager, E., Thum, R. A. (2014) The distribution of biotypes and hybrids of Myriophyllum spicatum and associated Euhrychiopsis lecontei in lakes of Central Ontario. Lake and Reservoir Management 30: 94-104. https://www.tandfonline.com/doi/pdf/10.1080/10402381.2013.876469

LaRue, E. A., Grimm, D., Thum, R. A. (2013) Laboratory crosses and genetic analysis of natural populations demonstrate sexual viability of invasive hybrid watermilfoils (Myriophyllum spicatum× M. sibiricum). Aquatic botany, 109, 49-53.https://doi.org/10.1016/j.aquabot.2013.04.004

LaRue, E. A., Zuellig, M. P., Netherland, M. D., Heilman, M. A., Thum, R. A. (2013) Hybrid watermilfoil lineages are more invasive and less sensitive to a commonly used herbicide than their exotic parent (Eurasian watermilfoil). Evolutionary Applications 6: 462-471. https://dx.doi.org/10.1111%2Feva.12027

Tavalire, H. F., Bugbee, G. E., LaRue, E., Thum, R. A. (2012) Hybridization and the evolution of invasiveness: Introduced hybrids are more invasive than introduced parental genotypes of variable leaf watermilfoil. Evolutionary Applications 5: 892-900.

Thum, R. A., Wcisel, D. J., Zuellig, M. P., Heilman, M., Hausler, P., Tyning, P., Huberty, L., Netherland, M. D. (2012) Field documentation of decreased herbicide response by a hybrid watermilfoil population. Journal of Aquatic Plant Management 50: 141-146.

Zuellig, M. P., Thum, R. A. (2012) Multiple introductions of invasive Eurasian watermilfoil and recurrent hybridization with native northern watermilfoil in North America. Journal of Aquatic Plant Management 50: 1-19.

Allen, M. R., Thum, R. A., VanDyke, J. N., Cáceres, C.E. (2012) Trait sorting in Daphnia colonizing man-made lakes. Submitted, Freshwater Biology 57: 1813-1822.

Poovey, A. G., Mudge, C. R., Thum, R., James, C., Getsinger, K. D. (2012) Evaluations of contact aquatic herbicides for controlling two populations of submersed flowering rush. Journal of Aquatic Plant Management 50: 48-54.

Thum, R., Mercer, A.T., Wcisel, D. J. (2012) Loopholes in the regulation of invasive species: genetic identifications identify mislabeling of prohibited aquarium plants. Biological Invasions 14: 929-937.

Thum, R. A., Zuellig, M. P., Moody, M., Johnson, R., Vossbrinck, C. (2011). Molecular markers reconstruct the invasion history of variable leaf watermilfoil (Myriophyllum heterophyllum) and distinguish it from closely related species Biological Invasions 13: 1687-1709

LaRue, E., Stacey, M. B., Ruetz III, C., Thum, R. A. (2011) Population genetic structure of the round goby in Lake Michigan: implications for dispersal of invasive species Hydrobiologia 663: 71-82

Vossbrinck, C., LaRue, E., Thum, R. A., o. a. (2010) Isolation of microsatellite markers for the watermilfoil weevil Euhrychiopsis lecontei. Molecular Ecology Resources 10: 1106-1108.

Thum, R. A., Zuellig, M. Myriophyllum heterophyllum. In CABI International (Ed.), Compendium of invasive species (http://www.cabi.org/isc)

Thum, R. A., Lennon, J.T. (2010) Comparative ecological niche models predict the invasive spread of variable-leaf milfoil (Myriophyllum heterophyllum) and its potential impact on closely related native species Biological Invasions 12: 133-143

Allen, M., Thum, R. A., Cáceres, C. E. (2010) Does resource monopolization explain genetic differentiation in Daphnia populations? Molecular Ecology 19: 3076-3087

Thum, R. A., Harrison, R. G. (2009) Deep genetic divergences among morphologically similar and parapatric Skistodiaptomus (Copepoda: Calanoida: Diaptomidae) refute the hypothesis of Pleistocene speciation Biological Journal of the Linnean Society 96 150-165

Thum, R. A., Derry, A. (2008) Contrasting patterns of mitochondrial DNA sequence divergences in two morphospecies of diaptomid copepods: taxonomic implications Hydrobiologia 614 197-207

Thum, R. A. (2007) Reproductive interactions and the maintenance of parapatry in Skistodiaptomus copepods. Oikos 116: 759-768.

Thum, R. A., Lennon, J. T. (2006) Is hybridization responsible for aggressive growth of non-indigenous water-milfoils? Biological Invasions 8: 1061-1066.

Thum, R. A., Lennon, J.T., Connor, J., Smagula, A. P. (2006) A DNA fingerprinting approach for distinguishing among native and non-native milfoils. Lake and Reservoir Management 22: 1-6.

Thum, R. A., Stemberger, R.S. (2006) Pure spatial and spatially-structured environmental variables explain copepod range limits. Canadian Journal of Fisheries and Aquatic Sciences 63: 1397-1404.

Turgeon, J., Stoks, R., Thum, R. A., Brown, J. M., McPeek, M. A. (2005) Simultaneous quaternary radiations of three damselfly clades across the holarctic. American Naturalist 165: E78-E107.

Thum, R.A. (2004) Using 18S rDNA to resolve diaptomid copepod (Copepoda: Calanoida: Diaptomidae) phylogeny: an example with the North American genera. Hydrobiologia 519: 135-141.

James, F. C., Hess, C. A., Kicklighter,B. C., Thum, R. A. (2001) Ecosystem management and the niche gestalt of the red-cockaded woodpecker in longleaf pine forests. Ecological Applications 11: 854-870.