AMPHIBIAWEB
Odorrana bacboensis
black egg
family: Ranidae

AmphibiaChina 中国两栖类.

Conservation Status (definitions)
IUCN (Red List) Status Least Concern (LC)
CITES
Other International Status None
National Status None
Regional Status None

Country distribution from AmphibiaWeb's database: China, Viet Nam

 

View distribution map using BerkeleyMapper.

   

From the IUCN Red List Species Account:

 

Range Description

This species occurs in Viet Nam in the provinces of Lao Cai, Tuyen Quang, Bac Kan and Nghe An (Bain et al. 2003, Nguyen et al. 2005, Nguyen et al. 2009, J. Rowley pers. comm. 2015). The type locality is Khe Moi River, west of Con Cuong village, Con Cuong, Nghe An, Viet Nam (Bain et al. 2003). Recently, the species has also been found in China, in Napo County in Guangxi and Hekou County in Yunnan (Chen et al. 2013, Wang et al. 2015). The species is found over a large elevation range between 230–1,123 m Asl (J. Rowley pers. comm. 2015).

Habitat and Ecology

The species occurs in forested river systems that vary from shallow and slow moving to torrential and deep (Bain et al. 2003, J. Rowley pers. comm. 2015). Individuals may be found on boulders and logs, both in and around the water and in the adjacent forest (Bain et al. 2003, J. Rowley pers. comm. 2015). The species reportedly feeds on large invertebrates, including small freshwater crabs (Bain et al. 2003). Little is known about the reproductive biology of the species, though females appear to lay black eggs (2 mm in diameter) during an autumnal breeding season (Bain et al. 2003). Ongoing habitat loss and fragmentation have been reported for the species' range in northern Viet Nam (Ziegler et al. 2004).

Population

No information is currently known on the size and trends of this species' population. However, population decline is expected due to the ongoing habitat loss and changes to catchment hydrology in northern Viet Nam (Swan and O'Reilly 2004, Ziegler et al. 2004). The species has been encountered in a number of surveys in the last decade (Wang et al. 2015, J. Rowley pers. comm. 2015); however, further surveys are needed to elucidate population size and trends.

Population Trend

decreasing

Major Threats

The species is generally not a preferred food source and reports of harvesting practices do not indicate likelihood of over-harvesting for the foreseeable future (Bain et al. 2003). Therefore, human harvesting is unlikely to constitute a major threat. However, due to human population growth and increasing demand for agricultural and timber products, the loss of forest habitat is ongoing and expected to increase throughout northern Viet Nam (Swan and O’Reilley 2004, Ziegler et al. 2004). In particular, forest landscapes are increasingly fragmented and degraded, while the hydrology of rivers and streams are increasingly altered by human activity (Ziegler et al. 2004). Thus, habitat loss constitutes an ongoing threat to this riparian and forest-dependent species.

Conservation Actions

Conservation Actions
The species occurs in a number of protected areas in Viet Nam, including Ba Be Lake National Park, Na Hang Nature Reserve, Pu Mat Nature Reserve and Pu Hoat Proposed Nature Reserve (Bain et al. 2003, J. Rowley pers. comm. 2015). Its inferred range also extends into parts of Vu Quang Nature Reserve in Viet Nam and Yunnan Da Wei Shan Nature Reserve in China. Nonetheless, parts of the species’ current predicted range also lie outside of protected areas and are at threat from deforestation.

Research Needed

Further biological and ecological research on the species is needed for a better understanding of its habitat requirements, distribution and abundance, and would assist future conservation actions.

Red List Status

Least Concern (LC)

Rationale

Although the species occurs in northern Viet Nam and southern China, and its range is fragmented, its distribution is not considered Severely Fragmented in accordance with the Guidelines for Using the IUCN Red List Categories and Criteria (version 11) and its extent of occurrence (EOO) is 106,213 km2. Therefore, the species is currently considered as Least Concern.

Citation

IUCN SSC Amphibian Specialist Group 2017. Odorrana bacboensis. The IUCN Red List of Threatened Species 2017: e.T58554A63900158. http://dx.doi.org/10.2305/IUCN.UK.2017-2.RLTS.T58554A63900158.en .Downloaded on 19 December 2018

 

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