Monarch Butterfly

The report evaluates the vulnerability of North American monarch butterflies (Danaus plexippus) to climate change, identifying high sensitivity to temperature and a critical dependence on milkweed. While the species possesses high adaptive capacity due to dispersal ability and reproductive rates, it faces significant threats from habitat loss, pesticide use, and extreme weather. Recommended strategies focus on restoring milkweed and nectar sources, protecting overwintering forests in Mexico and California, and increasing population monitoring.

• Monarch butterflies exhibit high adaptive capacity due to their short generation time, high reproductive rate, and high dispersal ability, which may help them adapt to long-term climate changes.
• The species is highly sensitive to climate and weather, relying on temperature cues to trigger essential life cycle events including reproduction, migration, and hibernation.
• Monarchs are dietary specialists that depend exclusively on milkweed for larval development, but milkweed abundance is declining across their range, particularly in the US Midwest due to the use of glyphosate herbicide.
• Extreme weather events pose significant risks; for example, a 2002 storm killed 80% of the overwintering population in Mexico, and a 1981 storm killed approximately 2.5 million butterflies.
• North American monarch populations have suffered substantial habitat loss, potentially exceeding 165 million acres over the last 20 years, including nearly one-third of summer breeding grounds.
• Temperature extremes directly impact survival and development: temperatures above 29°C can retard caterpillar growth, and exposure above 36°C can cause significant mortality.
• Climate-adaptive management priorities include restoring native milkweed and nectar sources, protecting undisturbed overwintering forests in Mexico and California, and reducing the use of pesticides and herbicides.

APA

Advani, N. (2015). Monarch Butterfly. WWF International. https://www.worldwildlife.org/documents/625/3n3nnh78ry_Monarch_butterfly___WWF_wildlife_and_climate_change_series.pdf

Chicago

Advani, Nikhil. Monarch Butterfly. WWF International, 2015. https://www.worldwildlife.org/documents/625/3n3nnh78ry_Monarch_butterfly___WWF_wildlife_and_climate_change_series.pdf.

Wikipedia

{{cite report |last1=Advani |first1=Nikhil |title=Monarch Butterfly |publisher=WWF International |date=2015 |url=https://www.worldwildlife.org/documents/625/3n3nnh78ry_Monarch_butterfly___WWF_wildlife_and_climate_change_series.pdf |access-date=23 October 2026 |via=Climate Insights Directory}}

BibTeX

@techreport{advani2015monarch, author = {Advani, Nikhil}, title = {{Monarch Butterfly}}, institution = {WWF International}, year = {2015}, url = {https://www.worldwildlife.org/documents/625/3n3nnh78ry_Monarch_butterfly___WWF_wildlife_and_climate_change_series.pdf}, urldate = {2026-10-23}, note = {Indexed by Climate Insights Directory} }