Extensive cross checking was necessary, however, to reach consistency of plant identifications within the study. I derived a major axis relationship between DBH and estimated TCV to allow for inclusion of tree crown volume estimates into analyses (for details see Thalmann, 2001).
Phenology data were collected on randomly chosen plot trees (n = 56, 50 different species) and all subsequently recorded feeding trees of study animals (Avahi: n =178, 33 different species; Lepilemur: n =137, 39 different species) from the time they were first used to the end of the study. With a present/absent scheme I recorded the phenology approximately every 10 days (1-10th, 11-20th, 21-30 or 31st day of the month), spaced as evenly as possible: conspicuous buds (B), sprouting buds (sB), sprouting leaves (sL), young leaves (yL), mature leaves (mL), old and deciduous leaves (odL), flowers (Flo), fruits (Fr), relative reduction of foliage (icF), and absence of leaves from a tree (noL). Obviously, categories are not mutually exclusive because a given tree can have at the same time sprouting buds, leaves, and young leaves or other phenological combinations. The overall phenology of the forest (Figure 2, Appendix A-I) was finally inferred based on 64 different tree species in the forest representing 92% of tree stems, and 91% of TCV as calculated from the 40 plots.
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