Welcome to the monarch library! Our goal is to include all peer-reviewed articles on monarch biology with links to sites that will give you the easiest direct access to each article. Please contact if you 1) know of an article not included, 2) find a mistake in any of the listed articles, 3) know of a better link to access an article. Thanks! With your help we can provide the most complete, informative access to all papers on monarch biology.

Field Definitions

First author: Last name of the first author
Type: Article or book chapter
Year: Publication year
Source: Journal or book
Category*: Broad scope of the publication.
Research topic (monarch & supporting research only)*: Specific topic.
Geographic focus*: Geographic setting for field studies.
Monitoring data used: Data from monitoring or public data efforts.
* Full list

4 result(s)
Category: Population dynamics, Monarch research
Type: Article
Year: 2021
Zylstra, E.R., Ries, L., Neupane, N. et al. Changes in climate drive recent monarch butterfly dynamics. Nat Ecol Evol (2021).

Category: Population dynamics, GMO/toxins
Type: Article
Year: 2018
Saunders SP, Ries L, Oberhauser KS, Thogmartin WE, Zipkin EF. Local and cross‐seasonal associations of climate and land use with abundance of monarch butterflies Danaus plexippus. Ecography. 2018 Feb;41(2):278-90.

Category: Monarch research, Population dynamics
Type: Book Chapter
Year: 2015
Ries L, Oberhauser KS, Taron DJ, Rendon-Salinas E. 2015. Connecting eastern monarch population dynamics across their migratory cycle in Oberhauser KS, Nail KR, Altizer SM, eds. Monarchs in a Changing World: Biology and Conservation of an Iconic Insect. Ithaca, USA: Cornell University Press.

Category: Population dynamics
Type: Article
Year: 2015
Ries L, Taron DJ, Rendon-Salinas E. (Online Early.) The Disconnect Between Summer and Winter Monarch Trends for the Eastern Migratory Population: Possible Links to Differing Drivers. Annals of the Entomological Society of America.

This database is a work in progress and is likely to contain several omissions and mistakes.
Please contact with any additions or corrections.