Archived 2021 topic: Black-throated Babbler (Stachyris nigricollis): Revise global status?

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6 Responses to Archived 2021 topic: Black-throated Babbler (Stachyris nigricollis): Revise global status?

  1. James Eaton says:

    Has there been anything published regarding the species being ‘abundant in plantations’ to justify the down listing?
    I’ve yet to encounter the species in 19 years of birding in Malaysia in any plantation away from lowland forest (albeit secondary forest but still with a well intact understorey).

  2. Ingkayut Sa-ar says:

    Khao Luang NP’s Krung Ching waterfall trail, Bang Lang NP’s Halasah Waterfall trail, and Hala-Bala WS are three conservation areas where the species has regularly been reported in Thailand.

    In addition, small population has sporadically recorded in Krabi province at Khao-Pra-Bang Kram & Khao-Kaew Khlong-Praya WS and Ban Nai Chong (Lowland Forest Fragments near Krabi town).

    There were specimens collected in Surat Thani and Satun province, but no recent records, indicating that its distribution in the peninsular Thailand used to be considerably wider.

    The biggest threat to the species’ habitat loss is the destruction of pristine lowland forest for growing rubber and oil palm in the peninsular Thailand over the last four decades.

  3. I strongly disagree in down-listing Black-throated Babbler. Populations of this formerly common species appeared to have been more heavily fragmented in Thailand through the loss of lowland forest. It has disappeared and possibly been extirpated from many sites owing to conversion of forest to plantations. The present distribution for the Thai part should be reduced to small patchy dots referring to locations mentioned above by Ingkayut.

    In 2005 it was assessed as nationally Vulnerable in Thailand by the ONEP: Office of Natural Resources and Environmental Policy and Planning (https://patricklepetit.jalbum.net/_FAUNA%20OF%20THAILAND/LIBRARY/Birds%20of%20Thailand.pdf).

    The situation has not gotten any better for all lowland forest species. Currently, it is listed as nationally Endangered by the ONEP and the BCST Records Committee (https://www.bcst.or.th/wp-content/uploads/2020/10/Checklist_ThaiBirds_2020.xlsx).

  4. Red List Team (BirdLife International) says:

    Many thanks to everyone who has contributed to this discussion. We greatly appreciate the time and effort invested by so many people in commenting. The window for consultation is now closed. We will analyse and interpret the new information and post a preliminary decision on this species’s Red List status on this page in early July.

    Thank you once again,
    BirdLife Red List Team

  5. Red List Team (BirdLife International) says:

    Preliminary proposal

    Based on available information, our preliminary proposal for the 2021 Red List would be to list Black-throated Babbler as Near Threatened, approaching threshold for listing as threatened under Criterion A2c+A3c+A4c.

    The tolerance of logging and indeed preference for once- or twice-logged forest on Borneo (Edwards et al. 2010, Hamer et al. 2015) does not seem to be reflected in the range in Peninsular Malaysia given the comments received. In a comparative study of understorey babblers in the Sundaic region, Styring et al. (2016) found densities of 1.7 individuals/ha in continuous natural forest, 2.8 individuals/ha in logged native forest fragments and mature plantations, and 1.9 individuals/ha in young (<5 years old) plantations, but none were found in oil palm plantations. However, they only assessed a single site in Peninsular Malaysia versus three on Borneo, and none in Sumatra. In Peninsular Malaysia the species was not found in heavily degraded and disturbed forest or plantations (Peh et al. 2011, Posa 2011). Rates of deforestation have been rapid within the range, and much of this has been absolute clearance and replacement with unsuitable oil palm. As such, rates of population reduction are suspected to approach the thresholds for listing the species as threatened under Criterion A2c+A3c+A4c.

    There is now a period for further comments until the final deadline in late July, after which the recommended categorisations will be put forward to IUCN.

    The final 2021 Red List categories will be published on the BirdLife and IUCN websites in December 2021, following further checking of information relevant to the assessments by both BirdLife and IUCN.

    Edwards, D., Larsen, T., Docherty, T.D., Ansell, F.A., Hsu, W.W., DerhĂ©, M., Hamer, K., & Wilcove, D. (2010). Degraded lands worth protecting: the biological importance of Southeast Asia’s repeatedly logged forests. Proceedings of the Royal Society B: Biological Sciences 278: 82 – 90.

    Hamer, K. C., Newton, R. J., Edwards, F. A., Benedick, S., Bottrell, S. H., & Edwards, D. P. (2015). Impacts of selective logging on insectivorous birds in Borneo: the importance of trophic position, body size and foraging height. Biological Conservation 188: 82-88.

    Peh, K.S.H., Sodhi, N.S., de Jong, J., Sekercioglu, C.H., Yap, C.A.M. and Lim, S.L.H. 2006. Conservation value of degraded habitats for forest birds in southern Peninsular Malaysia. Diversity and Distributions 12(5): 572-581.

    Posa, M. 2011. Peat swamp forest avifauna of Central Kalimantan, Indonesia: Effects of habitat loss and degradation. Biological Conservation 114(10): 2548-2556.

    Styring, A. R., Ragai, R., Zakaria, M., & Sheldon, F. H. (2016). Foraging ecology and occurrence of 7 sympatric babbler species (Timaliidae) in the lowland rainforest of Borneo and peninsular Malaysia. Current Zoology 62(4): 345-355.

  6. Red List Team (BirdLife International) says:

    Recommended categorisation to be put forward to IUCN

    The final categorisation for this species has not changed. Black-throated Babbler is recommended to be listed as Near Threatened, approaching the thresholds for listing as threatened under Criteria A2c+3c+4c.

    Many thanks for everyone who contributed to the 2021 GTB Forum process. The final 2021 Red List categories will be published on the BirdLife and IUCN websites in December 2021, following further checking of information relevant to the assessments by both BirdLife and IUCN.

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