The Ohio Lepidopterist Society has been monitoring sites throughout Ohio since 1995.
Wepprich T, Adrion JR, Ries L, Wiedmann J, and NM Haddad. 2019. Butterfly abundance declines over 20 years of systematic monitoring in Ohio, USA. PLOS ONE July 9, 2019 https://doi.org/10.1371/journal.pone.0216270
Wepprich T. 2019. Statewide butterfly monitoring by volunteer recorders in Ohio reveals a persistent decline in abundance, so what can we do? News of the Lepidopterists' Society 61(3):128-130.
Saunders, S.P., Ries, L., Oberhauser, K.S., and E.F. Zipkin. 2016. Evaluating confidence in population-level prediction from climate impacts: summer abundances of the monarch butterfly. Global Ecology and Biogeography 25(8):1000-1012
Thorson, J.T., Ianelli, J.N., Larsen, E.A., Ries, L., Scheuerell, M.D., Szuwalski, C., and E.F. Zipkin. 2016. Joint dynamic species distribution models: a tool for community ordination and spatio-temporal monitoring. Global Change Biology 25(9):1144-1158
Diamond, S.E., H. Cayton, T. Wepprich, C.N. Jenkins, R.R. Dunn, N.M. Haddad, and L. Ries. 2014. Unexpected phenological responses of butterflies to the interaction of urbanization and geographic temperature. Ecology 95(9):2613-2621.
Ries, L., K. Oberhauser, D. Taron, E. Rendon-Salinas. 2015. Connecting eastern monarch population dynamics across their migratory cycle. In (K. Oberhauser, ed.) Monarchs in a changing world: Biology and conservation of an iconic insect. Cornell University Press. Ithaca, NY.