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Monarch butterfly migration

Updated: Wikipedia source

Monarch butterfly migration

Monarch butterfly migration is the phenomenon, mainly across North America, where the monarch subspecies Danaus plexippus plexippus migrates each autumn to overwintering sites near the west coast of California or mountainous sites in central Mexico. Other populations from around the world perform minor migrations or none at all. This massive movement of butterflies has been recognized as "one of the most spectacular natural phenomena in the world". The North American monarchs begin their southern migration in September and October. Migratory monarchs originate in southern Canada and the northern United States. They then travel thousands of kilometers to overwintering sites in central Mexico. The butterflies arrive at their roosting sites in November. They remain in roosts atop volcanic mountains on oyamel fir trees (Abies religiosa) during the winter months and then begin their northern migration in March, back to North America and southern Canada. Two to three generations of monarchs complete the migration north. Female monarchs lay eggs for a subsequent generation during the northward migration. Four generations are involved in the annual cycle. The generation undertaking the southbound migration lives eight times longer than their parents and grandparents due to a regulatory age-inducing hormone. Similarly, the western populations migrate annually from regions west of the Rocky Mountains to overwintering sites near the coast of California. Not all monarch populations make major migrations. Monarchs migrate short distances in Australia and New Zealand. There are some populations of D. p. plexippus, for instance in Florida and the Caribbean, as well as another subspecies (D. p. megalippe) distributed in the Caribbean, Central America and northern South America, that do not migrate. Additional overwintering sites have been identified in Arizona and northern Florida. In encouraging news, the eastern monarch butterfly population nearly doubled in 2025, according to a report announced in Mexico. The population wintering in central Mexico's forests occupied 4.42 acres (1.8 ha), up from 2.22 acres (0.9 ha) during the previous winter. While monarchs occupied nearly twice as much forest habitat as they did during the previous year, populations remained far below the long-term average.

Tables

· Conservation › Reductions in milkweed acreage
Hab
Hab
Organization or political entities
Hea
Monarch conservation programs
Hab
Monarch conservation programs
Pol
Monarch conservation programs
Res
Monarch conservation programs
Edu
Monarch conservation programs
Cen
Monarch conservation programs
Gra
Monarch conservation programs
Res
Monarch conservation programs
Cit
Monarch conservation programs
Tag
Monarch conservation programs
Reg
Monarch conservation programs
Eco
Monarch conservation programs
Rep
Database
Pub
Organization or political entities
Association for butterflies
Monarch conservation programs
Monarch conservation programs
Monarch conservation programs
G
Monarch conservation programs
Monarch conservation programs
Organization or political entities
Project Monarch Health
Monarch conservation programs
Monarch conservation programs
Monarch conservation programs
Database
Organization or political entities
Monarch conservation programs
Database
Hea
Hab
Pol
Res
Edu
Cen
Gra
Res
Cit
Tag
Reg
Eco
Rep
Pub
Monarch Watch
Monarch Joint Venture
Association for butterflies
G
Project Monarch Health
Pollinator Partnership
UNESCO
La Naturaleza Nos Llama
National Park System
Executive Order – Presidential Memorandum
Xerces
R
Volunteer Match
Iowa Department of Natural Resources Iowa Prairie Resource Center
California State Park system
City ordinance of Capitola, California
The Coastal Zone Management Act, California
Assessment and Status Report, Canada
Monarch Butterfly Fund
G
Forest For Monarchs
R
Larson Juhl
Monarch Ecology Fund
Plantit
Global Climate Summit California Environmental Protection Agency
G
USDA
Medio Ambiente y Recursos Naturales
G
Texas Milkweeds and Monarchs
Wild Ones Wild for Monarchs
Mission monarch
Notes

References

  1. Health monitoring contributes to conservation by studying the health of butterflies in all or various stages of its life
  2. Habitat restoration contributes to conservation by planting larval food plants, nectaring plants and overwinter plants n
  3. Policy contributes to the conservation by coordination of efforts across governmental and non-governmental organizations
  4. Reserves protect habitat for the butterfly.
  5. Education contributes to the conservation of the monarch by raising awareness and participation in conservation activiti
  6. Censuses of the monarch provide information regarding the migration routes, relative population comparisons between diff
  7. Grants are given (G) and received (R) to help foster new conservation programs and to fund research.
  8. Research provides information regarding the butterfly and its migration.
  9. Citizen science participation involves activities by lay-persons to promote conservation.
  10. Tagging and then recapturing monarchs provides information useful to provide information on migration.
  11. Regulations exit to protect the butterfly and its habitat.
  12. Economic development promotes the development of alternative sources of income around Mexican overwintering sites to pre
  13. Repository is the accumulated data produced by scientists and citizen scientists.
  14. Available to public indicates whether this data are shared freely to the public.
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