Archived 2021 topic: Hook-billed Hermit (Glaucis dohrnii): Revise global status?

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4 Responses to Archived 2021 topic: Hook-billed Hermit (Glaucis dohrnii): Revise global status?

  1. Ben Phalan says:

    Given that:

    – this is a Brazilian endemic (and so, national and global assessments in principle should match);
    – the best estimate (suspected) of population size is less than 2,500 mature individuals in the National Red List assessment, based on the experience of ornithologists who know the species best (and thus it is listed as EN nationally);
    – that downlisting to NT would create a discrepancy of two levels between the National and Global Red Lists;
    – no precise estimate of population size (as required for Criterion C) exists, with only a very wide range of suspected values;
    – the species is apparently very demanding in terms of habitat quality, and much tree cover in the south of Bahia does not correspond to primary forest;
    – the population in the state of Espirito Santo is represented by only three records in WikiAves during the last decade (2011-2021), despite the species being formerly found at many other sites in that state according to the map in the National Red List assessment;
    – Glaucis hirsutus is a much commoner species and its densities may be a poor guide to densities of G. dohrnii;
    – the prior three points indicate that the population size is likely towards the lower end of the ‘suspected’ range;

    my suggestion would be to pend a decision on this species until a more systematic evaluation can be made of habitat and population size. Otherwise there is a risk of downlisting to NT and then having to uplist again to EN when better information is available. I’m willing to help with a more systematic evaluation.

  2. 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

  3. Red List Team (BirdLife International) says:

    Preliminary proposal

    Based on available information, our preliminary proposal for the 2021 Red List would be to list Hook-billed Hermit (Glaucis dohrnii) as Vulnerable under Criterion C2a(i).

    Following further consideration of comments and other new information, we consider that although no precise estimate of the population size is available, there is sufficient evidence to estimate a population size of <10,000 mature individuals, with no more than 1,000 mature individuals in each subpopulation. The species therefore qualifies as Vulnerable under Criterion C2a(i).

    There is now a period for further comments until the final deadline in mid-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.

  4. Red List Team (BirdLife International) says:

    Recommended categorisation to be put forward to IUCN

    The final categorisation for this species has not changed. Hook-billed Hermit is recommended to be listed as Vulnerable under Criterion C2a(i).

    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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