Peer-reviewed published literature which uses the Western Monarch Count dataset:
Crone, E. E., E. M. Pelton, L. M. Brown, C. C. Thomas, and C. B. Schultz. 2019. Why are monarch butterflies declining in the west? understanding the importance of multiple correlated drivers. Ecological Applications: A Publication Of The Ecological Society Of America 29:e01975. PDF
Pelton, E. M., C. B. Schultz, S. J. Jepsen, S. H. Black, and E. E. Crone. 2019. Western monarch population plummets: status, probable causes, and recommended conservation actions. Frontiers In Ecology And Evolution 7:258.
Schultz, C.B., L.M. Brown, E. Pelton, and E.E. Crone. 2017. Citizen science monitoring demonstrates dramatic declines of monarch butterflies in western North America Biological Conservation. 214:343-346.
Espeset, A.E., J.G. Harrison, A.M. Shapiro, C.C. Nice, J.H. Thorne, D.P. Waetjen, J.A. Fordyce, and M.L. Forister. 2016. Understanding a migratory species in a changing world: climatic effects and demographic declines in the western monarch revealed by four decades of instensive monitoring. Oecologia. 2016 Mar 21:1-2.
Jepsen, S. and S.H. Black. 2015. Understanding and conserving the western North American monarch population. In Oberhauser, K.S., K.R. Nail, and S.M. Alitizer, eds. Monarchs in a Changing World: Biology and Conservation of an Iconic Insect. Ithaca, USA: Cornell University Press.
Ries, L. and K. Oberhauser. 2015. A citizen army for science: quantifying the contributions of citizen scientists to our understanding of monarch butterfly biology. BioScience 65: 419-430.
Stevens, S.R. and D. Frey. 2010. Host plant pattern and variation in climate predict the location of natal grounds for migratory monarch butterflies in western North America. Journal of Insect Conservation 14: 731-744.
Vandenbosch, R. 2007. What do monarch population time series tell us about eastern and western population mixing? Journal of the Lepidopterists’ Society 61(1): 28-31.
Koenig, W. 2006. Spatial synchrony of monarch butterflies. The American Midland Naturalist 155(1): 39-49.
Frey, D. and A. Schaffner. 2004. Spatial and temporal patterns of monarch overwintering abundance in Western North America. In Oberhauser, K.S. and M.J. Solensky, eds. The Monarch Butterfly: Biology and Conservation. Ithaca: Cornell University Press.