NDLI: Exploring the use of sign surveys for monitoring relative abundance of sun bears: a case study in burned and unburned forests in East Kalimantan, Indonesian Borneo

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Exploring the use of sign surveys for monitoring relative abundance of sun bears: a case study in burned and unburned forests in East Kalimantan, Indonesian Borneo

Content Provider	Semantic Scholar
Author	Link
Copyright Year	2012
Abstract	Sun bears, Helarctos malayanus, the largest carnivore on the island of Borneo, are threatened by habitat loss. Besides direct cutting and forest conversion, forest fires and drought, related to recurring El Niño Southern Oscillation (ENSO) events, have degraded vast areas of sun bear habitat on Borneo. In this study we explore the use of sign (e.g., claw-marked trees, raided termite nests) surveys as a way to monitor changes in relative abundance of sun bears following an ENSO-related forest fire in 1998. We compared sign densities to an adjacent lowland dipterocarp forest that was not burned. We searched for sign in 92 1-ha strip transects (45 in unburned forest and 47 in burned forest) in 2000, 2001, 2002, 2005 and 2010. Densities of sun bear sign were close to zero in burned forest areas for several years after the fire, but by 2010 had increased to 28.0 ± 12.9 (SD) sign/ha, indicating re-colonization by sun bears. Sign densities in adjacent unburned forest remained stable over the years, averaging 41.6 ± 11.6 (SD) sign/ha. Densities of sun bear sign were still 35% lower in burned forest, which showed a paucity of certain types of sun bear foods, especially fruiting trees and above-ground termite colonies. Nevertheless, it is evident that these once-burned forest areas can still play an important role in the conservation of sun bears, as long as source populations for re-colonization are present in adjacent undisturbed forest. We discuss the potential and challenges to further develop sign transects as a tool for monitoring population trends of this species. Exploring the use of sign surveys for monitoring relative abundance of sun bears 133
File Format	PDF HTM / HTML
Alternate Webpage(s)	https://pure.uva.nl/ws/files/1813885/112627_10.pdf
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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