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“SECOND GROWTH AS HABITAT TO NOCTURNAL BIRDS: COMPARING OCCURRENCE BETWEEN PRIMARY FOREST AND DISTURBED ENVIRONMENTS"
Mônica Sberze Ribas
Gonçalo Ferraz
Mario Cohn-Haft
Future second growth sites?
Amazon deforestation
Fearnside, unp. data
Impacts of deforestation on forest species
www.seppo.net
Increase in second growth area
Wright e Muller Landau 2006
Objective
Compare the occupancy of primary forest and second growth sites by nocturnal birds.
Focal species
Cohn-Haft et al. 1997
Nyctibiidae Nyctibius griseus Nyctibius leucopterus
Strigidae Glaucidium harhyi Lophostrix cristata
Caprimulgidae Nyctidromus albicollis Caprimulgus nigrescens
Study area
Sampling points
Analysis that incorporate reality of the sampling process
Estimate occupancy (Ψ) accounting for imperfect detection (p)
Likelihood approach: What is the probability of obtaining a line of data given a model?
0 1 0 1 01 0 0 1 00 0 1 0 00 0 0 0 0
Co-variables – logit (Ψ) = β0 + β1cap Mackenzie et al. 2002, Hines 2004
Co-variables incorporated to the models
Null Model Alternative models
Ψ(.)p(.)
Ψ(SG)p(.)
Ψ(SG)p(dry season)
Ψ(SG)p(moon height)
Ψ(SG)p(dry season + moon height)
Ψ(.)p(dry season)
Ψ(.)p(moon height)
Ψ(.)p(dry season + moon height)
Influence of second growth in occupancy
Caprimulgidae and Strigidae pairs
Nyctibiidae pair – comparison between primary forest and second growth
Nyctibiidae pair – second growth modeling occurrence
Is second growth suitable for forest species?
Expected (G. hardyi, M. watsonii, N. griseus, N. leucopterus, N. albicollis)
Surprises (L. cristata, P. perspicillata, C. nigrescens e N. bracteatus)
What exactly are they doing there?
Aknowledgments
Rita Mesquita Ajudantes de campo