Fig. 1.

Species accumulation curves indicate the increase in bird species richness (∼20 more species) at shaded coffee sites with higher tree cover than open coffee sites (13% vs. 7%). (A) Species accumulation curves were calculated with Estimates 9.1, using sampling with replacement (62). All samples were extrapolated to 179 d to compare them with the full reference sample for Las Cruces, the largest sample in the dataset, with 179 sampling days (64). Note that for some of the habitats, extrapolated species numbers are higher than the numbers actually recorded. (B) Chao 1 estimates of species richness. Note the differences between actual species accumulation versus expected species richness with Chao 1. Estimated (Chao 1) species richness values for the Las Cruces forest reserve, forest fragments, and secondary forest are the highest, and Amistad is the lowest, with coffee and riparian sites having intermediate values.