AREA OF FOREST OCCUPIED BY THE COLONIES OF MONARCH BUTTERFLIES IN MEXICO DURING THE 2021-2022 OVERWINTERING PERIOD

During the second half of December 2021, 10 monarch butterfly colonies were recorded in Mexico, occupying a total of 2.835 hectares of forest. This represents a 35% increase from the 2.10 hectares recorded in 2020. The colonies were distributed equally between Michoacan and the State of Mexico, with 2.174 hectares located inside the Monarch Butterfly Biosphere Reserve (MBBR) and 0.661 hectares outside of it. The largest colony was found in the Sierra Campanario Sanctuary at 1.187 hectares, while the smallest was in the Lomas de Aparicio Sanctuary at 0.003 hectares.

• In the second half of December 2021, 10 monarch butterfly colonies were registered, covering a total forest area of 2.835 hectares, which is a 35% increase over the 2.10 hectares recorded in 2020.
• The distribution of the 10 colonies was split evenly between the State of Mexico and Michoacan, with 2.174 hectares located within the Monarch Butterfly Biosphere Reserve (MBBR) and 0.661 hectares located outside the reserve.
• The largest recorded colony in the Monarch Region was 1.187 hectares in the Sierra Campanario Sanctuary (el Ejido El Rosario), and the smallest was 0.003 hectares in the Lomas de Aparicio Sanctuary (el Ejido Crescencio Morales).
• The report identifies three primary threats to monarch butterflies in North America: climate change, forest degradation in Mexico, and the decline of milkweeds at breeding sites.

APA

E., R.-S., FERNÁNDEZ-ISLAS, A., MENDOZA-PÉREZ, M., CRUZ-PIÑA, M., MONDRAGÓN-CONTRERAS, G., & MARTÍNEZ-PACHECO, A. (n.d.). AREA OF FOREST OCCUPIED BY THE COLONIES OF MONARCH BUTTERFLIES IN MEXICO DURING THE 2021-2022 OVERWINTERING PERIOD. WWF International. https://www.worldwildlife.org/documents/1134/7907txsoa8_Monarch_Butterfly_Survey_2021_2022_May24_2022_.pdf

Chicago

E., RENDÓN-SALINAS,, A. FERNÁNDEZ-ISLAS, M.A. MENDOZA-PÉREZ, M. CRUZ-PIÑA, G. MONDRAGÓN-CONTRERAS, and A. MARTÍNEZ-PACHECO. AREA OF FOREST OCCUPIED BY THE COLONIES OF MONARCH BUTTERFLIES IN MEXICO DURING THE 2021-2022 OVERWINTERING PERIOD. WWF International, n.d. https://www.worldwildlife.org/documents/1134/7907txsoa8_Monarch_Butterfly_Survey_2021_2022_May24_2022_.pdf.

Wikipedia

{{cite report |last1=E. |first1=RENDÓN-SALINAS, |last2=FERNÁNDEZ-ISLAS |first2=A. |last3=MENDOZA-PÉREZ |first3=M.A. |last4=CRUZ-PIÑA |first4=M. |last5=MONDRAGÓN-CONTRERAS |first5=G. |last6=MARTÍNEZ-PACHECO |first6=A. |title=AREA OF FOREST OCCUPIED BY THE COLONIES OF MONARCH BUTTERFLIES IN MEXICO DURING THE 2021-2022 OVERWINTERING PERIOD |publisher=WWF International |url=https://www.worldwildlife.org/documents/1134/7907txsoa8_Monarch_Butterfly_Survey_2021_2022_May24_2022_.pdf |access-date=23 October 2026 |via=Climate Insights Directory}}

BibTeX

@techreport{endarea, author = {E., RENDÓN-SALINAS, and FERNÁNDEZ-ISLAS, A. and MENDOZA-PÉREZ, M.A. and CRUZ-PIÑA, M. and MONDRAGÓN-CONTRERAS, G. and MARTÍNEZ-PACHECO, A.}, title = {{AREA OF FOREST OCCUPIED BY THE COLONIES OF MONARCH BUTTERFLIES IN MEXICO DURING THE 2021-2022 OVERWINTERING PERIOD}}, institution = {WWF International}, url = {https://www.worldwildlife.org/documents/1134/7907txsoa8_Monarch_Butterfly_Survey_2021_2022_May24_2022_.pdf}, urldate = {2026-10-23}, note = {Indexed by Climate Insights Directory} }