Archived 2015 topics: Everett’s Thrush (Zoothera everetti): uplist to Vulnerable?

This discussion was first published as part of the 2013 Red List update, but remains open for comment to enable reassessment in 2015.

BirdLife species factsheet for Everett’s Thrush

Everett’s Thrush Zoothera everetti is restricted to Borneo, where it is known only from submontane forest at 1,200-2,300 m on Mt Kinabalu, Mt Murud, Mt Mulu, Mt Dulit, Mt Trus Madi and the Kelabit uplands in Sabah and Sarawak, Malaysia. It is currently listed as Near Threatened (nearly meeting criterion C2a(ii)) as it is thought to have a moderately small, fragmented population, and to be undergoing a continuing decline owing to the loss and degradation of forest habitats within its range.

This species appears to be genuinely rare within its restricted range. Its population is provisionally estimated to number 10,000-19,999 individuals, but density estimates are needed to inform a more accurate global population estimate. This estimate equates to 6,667-13,333 mature individuals, rounded here to 6,000-15,000 mature individuals.

Recent corrections of existing maps (which formerly erroneously mapped presence away from Borneo) show that the Extent of Occurrence (EOO) of this species is smaller than previously thought, now estimated at 3,500km2. Thus, the Everett’s Thrush could qualify for uplisting to Vulnerable under criterion B1ab(i,iii), on the basis of it having an EOO of less than 20,000km2, in which it is known to exist at no more than 10 locations and inferred to be undergoing continuing declines in its EOO, Area of Occupancy and area, extent and quality of its habitat.

Comments and information on the extent of this species’s range, the severity of forest loss within its range and the degree to which its habitat is fragmented, and its proposed uplisting are welcome.

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4 Responses to Archived 2015 topics: Everett’s Thrush (Zoothera everetti): uplist to Vulnerable?

  1. Andy Symes says:

    Preliminary proposals

    Based on available information, our preliminary proposal for the 2014 Red List is to pend the decision on Everett’s Thrush Zoothera everetti and keep this discussion open until early 2015, while leaving the current Red List category unchanged in the 2014 update.

    There is now a period for further comments until the final deadline of 31 March, after which recommended categorisations will be put forward to IUCN.

    The final Red List categories will be published on the BirdLife and IUCN websites in mid-2014, following further checking of information relevant to the assessments by both BirdLife and IUCN.

  2. Andy Symes says:

    Recommended categorisation to be put forward to IUCN

    Following further review, there has been no change to our preliminary proposal for the 2014 Red List status of this species.

    This discussion will remain open for further comments and information until early 2015, and the current Red List category will remain unchanged in 2014.

  3. Andy Symes (BirdLife) says:

    Preliminary proposals

    Based on available information, our preliminary proposal for the 2015 Red List would be to continue to list:

    Everett’s Thrush as Near Threatened under criterion C2a(ii).

    There is now a period for further comments until the final deadline of 31 August, after which the recommended categorisation will be put forward to IUCN.

    The final Red List categories will be published on the BirdLife website in late October and on the IUCN website in November, following further checking of information relevant to the assessments by both BirdLife and IUCN.

  4. Andy Symes (BirdLife) says:

    Recommended categorisation to be put forward to IUCN

    Following further review, there have been no changes to our preliminary proposal for the 2015 Red List status of this species.

    The final categorisation will be published on the BirdLife website in late October and on the IUCN website in November, following further checking of information relevant to the assessment by BirdLife and IUCN.

Comments are closed.