From occupancy to species richness in experimental ￼forest patches
We used old BDFFP bird mist-netting data, collected between 1979 and 1993 by R. O. Bierregaard,Jr. and P.C. Stouffer to infer site occupancy by 150 different understory species. From the changes in occupancy through time, we obtain estimates of local extinction and colonization parameters, which in turn lead to estimates of equilibrium occupancy. From these, we drew predictions of understory bird species richness under different conditions of patch size and isolation. Paper submitted, rejected, and in revision. Collaboration with J. D. Nichols and J. E. Hines, USGS, with support from STRI and FAPEAM.
Photo by Rob Bierregaard, Jr. showing Dimona 10 and 1ha fragments short after isolation, in 1984.
Primary and secondary-forest site occupancy by understory diurnal birds
Following up on Monica Sberze’s 2010 nocturnal bird study, we decided to broaden the species set and improve sampling for a more informative comparison of primary and secondary forest bird populations. Sampling for this study was based on autonomous recording on 150 sampling points and gathers information about 140 species in a state-space community model of occupancy. The results offer a new classification of habitat preferences by local birds. Field work lead by Sandra M. de Freitas and Ulisses M. de Camargo with support from the Rufford Foundation, FAPEAM, and STRI. Paper submitted, rejected and in revision.
Photo of secondary forest near Colosso camp, by Ulisses M. Camargo.
Use of closed forest and tree-fall gap sites by understory birds
While there is much natural history intuition about which species tend to occur near to or far from tree fall gaps, there is very little quantitative study of these preferences. In this project we use autonomous recordings and hierarchical community models to test natural history predictions about who are the most gap-prone and gap-averse species in the local bired community. Study led by Ulisses M. Camargo and Sandra M. Freitas with support from STRI, FAPEAM, and the Rufford foundation. Manuscript in preparation.
Photo by Ulisses M. Camargo showing a tree-fall gap.
Survival and movement of White-plumed Antbirds
To date,our estimates of biological parameters for BDFFP bird populations have been largely based on detection/non-detection information. Most of the data collected, however is mark-recapture data from mist-netting records. This project is developing a multi-state mark-recapture model aimed at estimating movement and survival of White-plumed antbirds (Pithys albifrons) from spatially-indexed captures between continuous forest and isolated forest sites. Model was built in collaboration with J. Andrew Royle (USGS). Support: FAPEAM, STRI. Manuscript in preparation.
Photo of White-plumed antbird by Rob Bierregaard, Jr.