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Is Gurney's Pitta Hydrornis Gurneyi on the Brink of Extinction?

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Is Gurney's Pitta Hydrornis Gurneyi on the Brink of Extinction? Is Gurney's pitta Hydrornis gurneyi on the brink of extinction? N AY M YO S HWE,NITI S UKUMAL,MARK G RINDLEY and T OMMASO S AVINI Abstract The remaining large patches of lowland forest in et al., ), with South-east Asia expected to have the high- Tanintharyi, southern Myanmar, are the last global strong- est rate of vertebrate extinctions (Sodhi et al., ; hold for the Endangered Gurney’s pitta Hydrornis gurneyi. Laurance, ; Gray et al., ). There are multiple causes Except for a few individuals, the remaining population is of this, including overexploitation of wildlife to meet now restricted to this forest, below m altitude, mostly increasing demand for food, tonics and medicines, and within the Nga Wun, Lenya, and Parchan Reserved Forests. trade in live animals (Nijman, ; Rao et al., ; However, as in much of South-east Asia, Tanintharyi has Duckworth et al., ). However, the major cause of verte- been subjected to extensive deforestation, particularly for brate declines in South-east Asia is the massive reduction in oil palm cultivation. The aim of this research was to deter- the extent and quality of natural habitats, particularly low- mine the extent of remaining habitat suitable for Gurney’s land tropical forests, as a result of legal and illegal logging pitta. During January–October we revisited locations and conversion of forest to large-scale agricultural produc- (of ) where the species was detected during –,and tion (Green et al., ; Sodhi et al., ; Clay, ). found it in only of those locations (%); in all other loca- The Tanintharyi Region, the most southerly part of tions the forest had been cleared. We measured the decline of Myanmar, on the Ismuth of Kra, falls within a zoogeograph- suitable habitat since by examining all available intact ical transition zone between the Sundaic and Indo-Burmese forest in areas with elevations , m and slope , °. In subregions, supporting biological assemblages associated less than decades suitable habitat has declined from , with both, including the Endangered Malay tapir Tapirus to km (%). Protection of remaining lowland forest is indicus, Critically Endangered Sunda pangolin Manis java- now critical. Although the expansion of oil palm cultivation nica, and Endangered Lar gibbon Hylobates lar (Woodruff has slowed since its peak in the early s, two national & Turner, ). This transition zone is a unique haven for parks proposed by the Myanmar government in , biological diversity (Hughes et al., ; Donald et al., ), which would potentially offer legal protection for most of and is of major conservation importance for a range of low- the remaining Gurney’s pitta habitat, remain on hold because land specialist bird species, including the regionally endemic of political uncertainties. We recommend an alternative con- and Endangered Gurney’s pitta Hydrornis gurneyi and other servation approach for this species, based on an Indigenous species (Donald et al., ). Community Conserved Area model, and further research Tanintharyi has one of the largest areas of continuous low- to improve knowledge of the species and to determine how land forest in mainland South-east Asia (Donald et al., ) it could be saved from extinction. and until recently was largely spared from the high rates of clearance occurring elsewhere in the region (Leimgruber Keywords Deforestation, Gurney’s pitta, habitat, Hydrornis et al., ). Since , however, a large area of the gurneyi, Lenya National Park, Myanmar, South Tanintharyi, Tanintharyi lowland forest has been converted to oil palm Sundaic lowland plantations as part of a government plan for national self- sufficiency in edible oils; this has seen at least , km in the Tanintharyi Region allocated to at least oil palm com- Introduction panies (Baskett, ). Forest clearance has slowed since the election of a second democratic government in and in re- lobal biodiversity has declined by % since sponse to public and NGO pressure highlighting the negative G(Cardinale et al., ; Lanz et al., ). This trend environmental and social impacts of the oil palm industry is most accentuated in the tropical regions (Hoffmann and related illegal logging. Yet despite the cancellation of several concessions, oil palm cultivation remains a significant threat ’ NAY MYO SHWE* (Corresponding author), NITI SUKUMAL and TOMMASO SAVINI to Tanintharyi sbiodiversity,aselsewhereintheregion(e.g. Conservation Ecology Program, King Mongkut’s University of Technology Fitzherbert et al., ;Clay,;Lauranceetal.,a,b). Thonburi, Bangkok, Thailand. E-mail [email protected] Any significant further loss of this forest, already almost entirely MARK GRINDLEY Fauna & Flora International, Myanmar Programme, Yangon, lost from neighbouring Thailand and nearby Malaysia, would Myanmar be catastrophic for lowland specialist species in particular. *Also at: Fauna & Flora International, Myanmar Programme, Yangon, ’ Myanmar One such specialist species is Gurney s pitta, which is naturally restricted to flat, lowland Sundaic moist evergreen Received March . Revision requested April . Accepted September . First published online September . forest between ° and . ° N latitude (Donald et al., ). Oryx, 2020, 54(1), 16–22 © 2019 Fauna & Flora International doi:10.1017/S0030605318001242 Downloaded from https://www.cambridge.org/core. IP address: 170.106.202.8, on 02 Oct 2021 at 15:18:04, subject to the Cambridge Core terms of use, available at https://www.cambridge.org/core/terms. https://doi.org/10.1017/S0030605318001242 Gurney’s pitta 17 The species was first described from Tanintharyi in of suitable elevation and slope, and resurveyed for the (Hume & Davison, ), but was not recorded for over species in these areas. Finally, we discuss the threats to the years until being rediscovered on the Thai side of species and propose appropriate conservation actions. the peninsula in June (Round & Treesucon, ; Gretton et al., ). The species also occurs in Thailand but the population there has declined, mainly because its Study area habitat is not protected. In – this population was The study was conducted in what is believed to be the reported to be functionally extinct (Round, ). A recent remaining natural range of Gurney’s pitta in the southern survey in Thailand in the remaining patches of potential Tanintharyi Region (formerly Tenasserim Division), in habitat located only four individuals: two females detect- southern Myanmar. The region is bounded by Mon State ed visually and two males detected by calls (Thailand to the north, Thailand to the east and south, and the Wildlife Research Division, ). The species was first Andaman Sea to the west (Fig. a). The area has a dry season reconfirmed in southern Tanintharyi during field surveys (November–March) with monthly rainfall of , mm, in (Eames et al., ), followed by an estimate of a and a wet season (April–October) with a mean monthly total range size of c. , km (Donald et al., ). A popu- rainfall of mm (Baskett, ). We include all mainland lation estimate of ,–, pairs (Eames et al., ) forested areas in south Tanintharyi (mostly within Lenya, justified downlisting the species from Critically Endan- Nga Wun, Parchan and Tanintharyi Reserved Forests) gered to Endangered in (BirdLife International, from . to . ° N latitude, representing the limits of ). However, the increase in forest clearance for oil the species according to historical and recent observations palm cultivation during Myanmar’s political transition (Eames et al., ; Donald et al., ). from military to civilian government led to a massive reduction in lowland habitat. There is currently no strong evidence that the species is Methods being targeted by collectors or hunters, although this possi- bility cannot be discounted as trade in the species occurred Of the locations where the species was detected during in the past (Round & Treesucon, ). Nonetheless, under- –, .%( locations) were below m altitude standing the extent, nature and impact of habitat loss on and %( locations) below m, with five records from Gurney’s pitta is essential for conservation planning for above m, potentially of transient or non-breeding, the species. dispersing animals (Round & Treesucon, ; Lambert & Although the current extent of occurrence of the species Woodcock, ; Round, ). We therefore defined suit- is defined as , km (BirdLife International, ), the able habitat as below m and with slopes , ° (after estimate of the species’ total range in Myanmar, using niche Eames et al., ), and covered by closed-canopy forest envelope modelling based on unconverted forest up to and degraded primary forest with bamboo, following m altitude, is , km (Donald et al., ), with no Donald et al. () and Gretton et al. (). Elevation potentially suitable areas identified in Thailand. Although and slope maps were derived from the m resolution the species was rediscovered in in Thailand, it was ASTER Global Digital Elevation Map (NASA, ), and only found in a single km patch of lowland forest, preferred elevation and slope ranges were determined in an area already disturbed and fragmented (Round & using ArcGIS . (Esri, Redlands, USA). Treesucon, ). It was subsequently discovered at four To quantify habitat loss we analysed forest cover for other sites in Thailand (Gretton et al., ). It was reported , , and , resulting in three time intervals. to inhabit forest with an understory of rattans, native trees Landsat satellite images were used to identify forest areas in and palms (Round, ), with a preference for areas
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