Image: Heteromeles arbutifolia (Toyon), a common chaparral shrub in California. Plant secondary chemistry differs between populations on the California mainland and the nearby Channel Islands.
Image: Monarchs from Puerto Rico (left) and North America (right) reared under common greenhouse conditions
Image: A monarch butterfly nectaring on A. curassavica in Guam. Monarchs were first recorded in Guam in 1887.
Monarchs are originally from Central and North America but can now be found around the world. When and why did this range expansion occur? How are these populations related to one another?
Monarchs feed on milkweed plants as caterpillars. How do cardenolides (toxic secondary compounds) produced by milkweeds influence monarchs and their interactions with natural enemies?
How does does seasonal migration affect morphology and physiology? Can we see contemporary evolution in recently established non-migratory populations?
Current Opinion in Insect ScinceMigration genetics take flight: genetic and genomic insights into monarch butterfly migration
Proceedings of the Royal Society BMacroevolution of protective coloration across caterpillars reflects relationships with host plants
Cover Image - January Issue: Link
Molecular EcologyPopulation genetics of a recent range expansion and subsequent loss of migration in monarch butterflies
Annals of the Entomological Society of America
BioRxivPopulation-specific patterns of toxin sequestration in monarch butterflies from around the world
Conservation Science and PracticeAre eastern and western monarch butterflies distinct populations? A review of evidence for ecological, phenotypic, and genetic differentiation and implications for conservation
Cover Image - July Issue: Link
PNASTwo centuries of monarch butterfly collections reveal contrasting effects of range expansion and migration loss on wing traits
EvolutionHost plant adaptation during contemporary global range expansion in the monarch butterfly
Animal MigrationWing morphology in migratory North American monarchs: characterizing sources of variation and understanding changes through time
Research featured in National Geographic
OecologiaLandscape-level bird loss increases the prevalence of honeydew-producing insects and non-native ants
Biological Journal of the Linnean SocietyNon-migratory monarchs, Danaus plexippus (L.), retain developmental plasticity and a navigational mechanism associated with migration