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Quantitative Changes in Forest Quality i (2)

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Figure 1. Locations of 12 mountain massifs on which monarch butterfly overwintering occurs in the oyamel-pine for-
Figure 2. Aerial views of (a) agricultural expansion into the montane forest near the border of the states of Micho-acan and Mexico, 23 March 1999, and (b) agricultural encroachment on the southwestern border of the Campa-nario monarch butterfly overwinter
Figure 3. Deforestation in the protected southeastern buffer zone of the Chincua monarch butterfly overwintering reserve between (a) January 1985 and ( b) March 1999
Table 1.Information on aerial photographsa taken in the 1970s(n � 32) and 1984 (n � 47) that were used in the analyses of Mexican forests where monarch butterflies overwinter.
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