Murdoch University Research Repository

Welcome to the Murdoch University Research Repository

The Murdoch University Research Repository is an open access digital collection of research
created by Murdoch University staff, researchers and postgraduate students.

Learn more

Response of tropical avifauna to visitor recreational disturbances: A case study from the Sinharaja World Heritage Forest, Sri Lanka

Alwis, N.S., Perera, P. and Dayawansa, N.P. (2016) Response of tropical avifauna to visitor recreational disturbances: A case study from the Sinharaja World Heritage Forest, Sri Lanka. Avian Research, 7 (1). Art. 15.

[img]
Preview
PDF - Published Version
Download (1MB) | Preview
Free to read: https://doi.org/10.1186/s40657-016-0050-5
*No subscription required

Abstract

Background

We investigated the impact of human recreational disturbances on the distribution of birds along a popular nature trail in Sinhararja World Heritage Forest, Sri Lanka. It was hypothesized that visual and noise stimuli caused by the presence of humans affect the distribution of avifauna associated with this nature trail.

Methods

Nine circular plots of 25 m fixed-radius laid along the trail (0 m), and 18 plots laid perpendicular to the trail at 75 and 150 m intervals, were studied from March 2013 to January 2014. The degree of human recreational disturbances was assessed in terms of visitor group size (visual disturbance) and their noise level (sound disturbance). These disturbances were categorized along a four-point scale (no human disturbance, low, medium and high disturbance). The relationship between disturbance levels and the abundance of birds was statistically tested.

Results

ANOVA results revealed that the abundance of birds differed significantly under various intensities of recreational disturbances at each distance level. A significant negative correlation between abundance of birds and intensity of disturbance at 0 m distance suggests an avoidance of edge habitats by birds in the presence of humans. Abundance of birds increased at the 75 and 150 m distance levels with increasing disturbances occurring at the trail. Significant negative correlations were further observed between disturbance level and the abundance of birds in ground/understory and sub-canopy vertical strata of the forest at 0 m distance.

Conclusions

Under high levels of recreational disturbance occurring at this trail, the abundance of birds near the trail declined significantly, while bird abundance in the interior of the forest increased. The sensitivity of individual bird species to visitor disturbances varied with the vertical stratum of the forest they usually occupy. Birds occupying the ground, understory and sub-canopy are particularly sensitive to recreational disturbances while bird species occupying the canopy and above are less vulnerable to recreational disturbances.

Item Type: Journal Article
Publisher: BioMed Central Ltd as part of Springer Nature
Copyright: © 2016 The Authors.
URI: http://researchrepository.murdoch.edu.au/id/eprint/63042
Item Control Page Item Control Page

Downloads

Downloads per month over past year