Decline of monarch butterflies overwintering in Mexico: is the migratory phenomenon at risk?

@article{Brower2012DeclineOM,
  title={Decline of monarch butterflies overwintering in Mexico: is the migratory phenomenon at risk?},
  author={Lincoln Pierson Brower and Orley R. Taylor and Ernest H. Jr. Williams and D. A. Slayback and Ra{\'u}l R. Zubieta and M Isabel Ram{\'i}rez},
  journal={Insect Conservation and Diversity},
  year={2012},
  volume={5}
}
Abstract.  1. During the 2009–2010 overwintering season and following a 15‐year downward trend, the total area in Mexico occupied by the eastern North American population of overwintering monarch butterflies reached an all‐time low. Despite an increase, it remained low in 2010–2011. 
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Oyamel fir forest trunks provide thermal advantages for overwintering monarch butterflies in Mexico
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The majority (85%) of 394 monarch butterflies sampled from overwintering sites in Mexico contain the same epoxy cardenolide glycosides, including most conspicuously a novel polar glycoside with aExpand
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