Behavioral Patterns of Colobus in Logged and U nlogged Forests The Conservation Value of Harvested Forests

Although tropical forests cover only 6% of Earth's arable surface, they account for nearly 50% of all known species (National Research Council, 1992). Despite this diversity, these systems are increasingly threatened, as exemplified by a recent Food and Agriculture Organization report (FAa, 1999) which indicates that tropical countries are losing 127,300 km2 of forest annually; this does not consider the vast area being selectively logged ("-'55,000 km2; FAa, 1990) or the forests degraded by fire (Laurance, 1999; Nepstad ct at., 1999;