Quantitative changes in forest quality in a principal overwintering area of the monarch butterfly in Mexico, 1971-1999

Brower, L.P ; Castilleja, G ; Peralta, A ; Lopez-Garcia, J ; Bojorquez-Tapia, L ; Diaz, S ; Melgarejo, D ; Missrie, M

Conservation biology, 2002-04, Vol.16 (2), p.346-359 [Periódico revisado por pares]

Boston, MA, USA: Blackwell Science Inc

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