Presentation on theme: "SECOND GROWTH AS HABITAT TO NOCTURNAL BIRDS: COMPARING OCCURRENCE BETWEEN PRIMARY FOREST AND DISTURBED ENVIRONMENTS" Mônica Sberze Ribas Gonçalo Ferraz."— Presentation transcript:
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.
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 0 1 0 0 1 0 0 0 1 0 0 0 0 0 0 0 Co-variables – logit (Ψ) = β0 + β1cap Mackenzie et al. 2002, Hines 2004
Co-variables incorporated to the models Null ModelAlternative 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