Journal: Insect Conservation and Diversity
Location: Sierra Chincua and Cerro Pelon, Mexico
Monarch butterflies overwinter in the Sierra Chincua and Cerro Pelon, Mexico, for a period of 154 days. During this time, they cluster on oyamel fir trees, which are on average 1.4 °C warmer than surrounding temperatures at night (protecting from freezing) and 1.2 °C cooler during the day (slowing the loss of fat stores). Older trees (with wider trunks) had more beneficial microclimates.
Monarch Butterfly – Danaus plexippus
Oyamel Fir – Abies religiosa
Brower LP, Williams EH, Slayback DA, Fink LS, Ramirez MI, Zubieta RR, Garcia MIL, Gier P, Lear JA, van Hook T, 2009. “Oyamel fir forest trunks provide thermal advantages for overwintering monarch butterflies in Mexico.” Insect Conservation and Diversity, DOI: 10.1111/j.1752-4598.2009.00052.x
Affiliations: Sweet Briar College, VA; Hamilton College, NY; NASA Goddard Space Flight Center; Universidad Nacional Autonoma de Mexico (UNAM); Huntingdon College, AL; National Cathedral School, Washington, DC.
Ground-nesting birds may be harmed by ‘vulture restaurants’: Cortés-Avizanda et al., 2009
March 27, 2009
Journal: Animal Conservation
Location: Fuerteventura, Canary Islands
Artificial ground-nesting birds‘ nests were placed along lines 200m to 34km from man-made vulture restaurants and scattered goat carcasses, and of the 67% lines predated by carrion-eaters, 90% of nests were attacked.
Cortés-Avizanda A, Carrete M, Serrano D, Donázar JA, 2009. “Carcasses increase the probability of predation of ground-nesting birds: a caveat regarding the conservation value of vulture restaurants.” Animal Conservation, 12(1): 85-88, doi: 10.1111/j.1469-1795.2008.00231.x
Affiliations: CSIC (Spanish National Research Council)