Center for Biological Diversity (Press Release, March 1, 2018): 60 Million Acres of Monarch Habitat to Be Doused With Toxic Weed Killer (PDF)

 

Howard, E. and A.K. Davis. 2015. Investigating long-term changes in the spring migration of monarch butterflies using 18 years of data from Journey North, a citizen science program. Annals of the Entomological Society of America. (PDF)

 

Howard, E. and A.K. Davis. Tracking the fall migration of eastern monarchs with Journey North roost sightings: new findings about the pace of fall migration. pages 207-214 in Oberhauser, K.S., Nail, K.R. and Altizer, S (eds.). Monarchs in a changing world: Biology and conservation of an iconic insect. Cornell University Press, Ithaca, NY. (PDF)

 

Lemoine NP (2015) Climate Change May Alter Breeding Ground Distributions of Eastern Migratory Monarchs (Danaus plexippus) via Range Expansion of Asclepias Host Plants. PLoS ONE 10 (2): e0118614. doi:10.1371/journal.pone.0118614 (PDF)

 

Davis, A.K., N.P. Nibbelink and E. Howard. 2012. Identifying large- and small-scale characteristics of migratory stopover sites of monarch butterflies with citizen-science observations. International Journal of Zoology, Article ID 149026, 9 pgs. (Invited submission for special issue on citizen science) (PDF)

 

Howard, E. and A.K. Davis. 2011. A simple numerical index for assessing the spring migration of monarch butterflies using data from Journey North, a citizen-science program. Journal of the Lepidopterists' Society 65(4). (PDF)

 

Howard, E., H. Aschen, and A.K. Davis. 2010. Citizen science observations of monarch butterfly overwintering in the southern United States. Psyche 2010. doi:10.1155/2010/689301 (PDF)

 

Davis, A.K. and E. Howard. 2005. Spring recolonization rate of monarch butterflies in eastern North America: new estimates from citizen-science data. Journal of the Lepidopterists' Society 59(1): 1-5. (PDF)

 

Howard, E. and A.K. Davis. 2004. Documenting the spring movements of monarch butterflies with Journey North, a citizen science program. Pages 105-114 in K. Oberhauser and M. Solensky (eds.). The monarch butterfly. Biology and conservation. Cornell University Press. Ithaca, NY.(PDF)

 

Mortality of migrating monarch butterflies from a wind storm on the shore of Lake Michigan, USA. Journal of Research on the Lepidoptera (PDF)