Archived 2015 topics: Long-tailed Woodnymph (Thalurania watertonii): request for information

This discussion was first published on Dec 1 2010 as part of the 2011 Red List update, but remains open for comment to enable reassessment in 2015.

Link to BirdLife species factsheet for Long-tailed Woodnymph

Long-tailed Woodnymph Thalurania watertonii is listed as Near Threatened under criterion B1a+b(i,ii,iii,iv,v) on the basis that it was thought to have a moderately small range in northeastern Brazil, within which its habitat is severely fragmented and its population is suspected to be declining owing to habitat loss.

The species’s Extent of Occurrence has now been updated and is estimated at 34,800 km2 (calculated from the area over which the species is considered extant or probably extant), which no longer approaches the threshold for Vulnerable under the B1 criterion. This suggests that the species is eligible for downlisting to Least Concern.

BirdLife range map for Long-tailed Woodnymph

The accurate assessment of this species’s threat category is hindered by an apparent lack of information on its population size and trend. The species is suspected to be in decline owing to widespread deforestation, which is severe in some areas, although it is noted that the species will accept altered habitats as long as forest patches or stands of trees remain.

Up-to-date information is requested on this species’s likely population size, current rate of decline over 12 years (estimate of three generations) and severity of habitat loss and degradation, to help in the evaluation of its status.

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5 Responses to Archived 2015 topics: Long-tailed Woodnymph (Thalurania watertonii): request for information

  1. Andy Symes says:

    Preliminary proposals

    Based on available information, our preliminary proposal for the 2014 Red List is to pend the decision on Long-tailed Woodnymph Thalurania watertonii 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:

    The species is assessed as Endangered on the 2014 Brazilian Red List.

    See http://www.icmbio.gov.br/portal/biodiversidade/fauna-brasileira/lista-de-especies/5737-especie-5737.html for more details.

    Preliminary proposals

    Based on this, our preliminary proposal for the 2015 Red List would be to list the species as Endangered under criteria B2ab(ii,iii); C2a(i).

    There is now a period for further comments until the final deadline of 7 September, 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. Carlos Otávio Araujo Gussoni says:

    The Long-tailed Woodnymph is relatively common in the Serra do Urubu area (RPPN Pedra D´Anta and RPPN Frei Caneca, Pernambuco state). It is easily found near the headquarters of RPPN Pedra D´Anta and is the most common species of Trochilidae on the feeders. Despite this, the relative abundance (IPA) of this species on the forest is quite low.

    Relative abundance (IPA) of Long-tailed Woodnymph, Serra do Urubu (PE):
    2010 – RPPN Pedra D´Anta: 0.05; RPPN Frei Caneca: 0
    2011 – RPPN Pedra D´Anta: 0.02; RPPN Frei Caneca: 0.1
    2012 – RPPN Pedra D´Anta: 0; RPPN Frei Caneca: 0
    2013 – RPPN Pedra D´Anta: 0.06; RPPN Frei Caneca: 0
    2014 (February) – RPPN Pedra D´Anta: 0; RPPN Frei Caneca: 0.05
    2014 (May) – RPPN Pedra D´Anta: 0.05; RPPN Frei Caneca: 0.05
    2014 (July) – RPPN Pedra D´Anta: 0; RPPN Frei Caneca: 0
    2014 (December) – RPPN Pedra D´Anta: 0; RPPN Frei Caneca: 0
    2015 – RPPN Pedra D´Anta: 0; RPPN Frei Caneca: 0

    I agree with the inclusion in the category Endangered.

  5. 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.