Species composition and functional traits of understory birds in lower montana evergreen forest at Mae-Kog Ma biosphere reserve, Chiang Mai province

Name: Supalak Siri

LCSH: Kasetsart University -- Dissertations. Ph.D. (Forestry) 2020

Classification :.LCCS: QL691.T35

LCSH: Kasetsart University. -- Department of Forestry -- Dissertations

LCSH: Birds -- Chiang Mai -- Mae Sa-Kog Ma

LCSH: Birds -- Behavior -- Chiang Mai -- Mae Sa-Kog Ma

LCSH: Environmental monitoring -- Chiang Mai -- Mae Sa-Kog Ma

Abstract: The structure and complexity of forests are important resources for understory birds. In tropical forests, a fallen tree introduces environmental heterogeneity to the forest. Long term information has not been well documented on bird assemblage uses of forest gaps until becoming closed canopy forest in the montane forests of Thailand. The aims of the study are: 1) to compare the species composition and feeding guilds of understory birds between under closed canpies (UCC) and forest gaps (FG); 2) to investigate how leg functional traits are adapted to UCC conditions and mid-sized FG; and 3) to examine the impact of forest gap size on the bird community and morphology of birds at Mae Sa-Kog Ma Biosphere Reserve. Monthly mist netting was used to capture understory birds from October 2014 to December 2017. In this study, FG created by natural disturbances increase the habitat and species diversity of understory birds. Intermediate levels of natural disturbances that occurred in the FG in this study area promoted the greatest biological diversity (H' of birds in FG more than UCC during gap succession), created environmental heterogeneity, and provided important resources for understory birds. In this study, the number of species and captured birds in medium gaps were greater than for bird of other sizes. Next, some morphological traits are adapted to UCC conditions and FG. The results were that ground-foraging birds were generally long-legged, and climbing birds were generally short-legged. Understory species living in dense forest areas were significantly associated with long claws, toes, and tibiae, whereas species occurring in gaps and open areas tended to have shorter leg structures. In the FG, bird body weight had aweak negative correlation with gap size, and wing lengths in large gaps were slightly shorter than for the small gaps. My findings suggest that understory birds with long leg structures, medium-sized birds (>60 g) and birds with longer wings that live under closed canopies or small gaps are most vulnerable to natural forest disturbances (small-scale) or the conversion of forests to large-scale open areas.

Kasetsart University. Office of the University Library

Address: Bangkok

Email: tdckulib@ku.ac.th

Name: Prateep Duengkae

Role: Thesis Advisor

Name: Dokrak Marod

Role: Thesis CO-Advisor

Created: 2020

Modified: 2025-06-30

Issued: 2025-06-30

วิทยานิพนธ์/Thesis

application/pdf

URL: https://www.lib.ku.ac.th/KUthesis/2563/supalak-sir-all.pdf

CallNumber: QL691.T35 .S86

eng

Spatial: Chiang Mai Mae Sa-Kog Ma

Spatial: Chiang Mai Mae Sa-Kog Ma

Spatial: Chiang Mai Mae Sa-Kog Ma

DegreeName: Doctor of Philosophy

Level: Doctoral Degraee

Descipline: Forestry

Grantor: Kasetsart University

©copyrights Kasetsart University

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