SECOND GROWTH AS HABITAT TO NOCTURNAL BIRDS: COMPARING OCCURRENCE BETWEEN PRIMARY FOREST AND DISTURBED ENVIRONMENTS" Mônica Sberze Ribas Gonçalo Ferraz.

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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

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 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? 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