“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