7 thoughts on “Bahia Tyrannulet (Phylloscartes beckeri)”
The distribution of this species is very restricted. In Minas Gerais there are only 2 localities. In Bahia, the subpopulations are isolated. They are always associated with well-preserved areas. I think this is an abrupt change of category. Vulnerable would at least be more appropriate.
I understand that the National Assessment for this Brazilian endemic species has gone from EN in 2013 to LC currently, so the proposed change would bring the two lists closer into sync (up to date information is not available on the SALVE portal).
However, I share the concerns of Edson Ribeiro, as this species is restricted in terms of habitat quality as well as altitude (750–1200 m according to Birds of the World). On WikiAves, there are only five locations with records in double figures of this species (https://www.wikiaves.com.br/mapaRegistros_borboletinha-baiana), which, while influenced by observer effort, accessibility and perhaps identification challenges, may be an indication that this species remains difficult to find.
It would be important to carefully compare the information from SALVE and SIS before making a change.
Many thanks to everyone who has contributed to this discussion. We greatly appreciate the time and effort invested in commenting. The window for consultation is now closed and we are unable to accept any more comments until 25 April 2025. We will now analyse and interpret the information, and we will post a preliminary decision on this species’ Red List category on this page on 25 April 2025, when discussions will re-open.
We thank all contributors for their comments. In the absence of a direct population/density estimate and an inferred decline in mature individuals, the species can only be considered to be approaching threatened thresholds under Criterion C sensu IUCN Guidelines. Based on available information, our preliminary proposal for the 2025 Red List would be to adopt the proposed classification outlined in the initial forum discussion. Further input is sought however, particularly regarding the specific questions outlined in the proposal above.
There is now a period for further comments until the final deadline on 4 May 2025, after which the recommended categorisations will be put forward to IUCN.
The final 2025 Red List categories will be published on the BirdLife and IUCN websites in October 2025, following further checking of information relevant to the assessments by both BirdLife and IUCN.
I understand that if there is no estimate of the number of mature individuals, but only suspected or inferred, criterion C cannot be used, not even to classify as NT. If there is no estimate of population size, criterion C does not apply, the species would be DD by this criterion.
The national assessment considered the species as LC because estimates of habitat loss carried out through remote sensing tools available on Google Engine (https://earthengine.google.com/) and MapBiomas (https://mapbiomas.org/), between 2010 and 2020, indicate that there was a loss of 1.9% in areas included in the categories of “Forest Formation” and “Savanna Formation” at altitudes between 750 and 1200 m, within the species’ distribution polygon, over 10 years.
However, the species can be considered NT by criterion B2, since the AOO calculated by the national assessment is 968 km², calculated based on georeferenced records and records inferred considering the potential habitat. There is a decline in habitat quality caused by deforestation of forests due to agricultural expansion and the spread of fires. However, the population is not fragmented, with most of its population occurring in the Chapada Diamantina National Park, and there are certainly more than 10 locations.
Many thanks to everyone who has contributed to this discussion. We greatly appreciate the time and effort invested in commenting. The window for consultation is now closed and we are unable to accept any more comments. We will analyse and interpret the information, and a final decision on this species’ Red List category will be posted on this page on 12 May 2025.
Recommended categorisation to be put forward to IUCN
We thank all contributors for their comments.
To be listed as threatened under Criterion C it is true that the population size must be estimated – it cannot be inferred or suspected (see IUCN Standards and Petitions Committee 2024). A listing as Near Threatened only requires a species to approach threatened thresholds however. Although not estimated, the population size threshold can be considered to be nearly met when the population size is suspected/inferred to be <10,000 mature individuals. The suspected population size in this instance is thus enough to qualify the species as Near Threatened under Criterion C, given there is also a suspected decline and likely less than 1,000 mature individuals in the largest subpopulation.
The final categorisation for this species has not changed. Bahia Tyrannulet is recommended to be listed as Near Threatened, approaching thresholds under Criterion C2a(i).
Many thanks for everyone who contributed to the 2025.2 GTB Forum process. The final Red List categories will be published on the BirdLife and IUCN websites in October 2025, following further checking of information relevant to the assessments by both BirdLife and IUCN.
The distribution of this species is very restricted. In Minas Gerais there are only 2 localities. In Bahia, the subpopulations are isolated. They are always associated with well-preserved areas. I think this is an abrupt change of category. Vulnerable would at least be more appropriate.
I understand that the National Assessment for this Brazilian endemic species has gone from EN in 2013 to LC currently, so the proposed change would bring the two lists closer into sync (up to date information is not available on the SALVE portal).
However, I share the concerns of Edson Ribeiro, as this species is restricted in terms of habitat quality as well as altitude (750–1200 m according to Birds of the World). On WikiAves, there are only five locations with records in double figures of this species (https://www.wikiaves.com.br/mapaRegistros_borboletinha-baiana), which, while influenced by observer effort, accessibility and perhaps identification challenges, may be an indication that this species remains difficult to find.
It would be important to carefully compare the information from SALVE and SIS before making a change.
Many thanks to everyone who has contributed to this discussion. We greatly appreciate the time and effort invested in commenting. The window for consultation is now closed and we are unable to accept any more comments until 25 April 2025. We will now analyse and interpret the information, and we will post a preliminary decision on this species’ Red List category on this page on 25 April 2025, when discussions will re-open.
Preliminary proposal
We thank all contributors for their comments. In the absence of a direct population/density estimate and an inferred decline in mature individuals, the species can only be considered to be approaching threatened thresholds under Criterion C sensu IUCN Guidelines. Based on available information, our preliminary proposal for the 2025 Red List would be to adopt the proposed classification outlined in the initial forum discussion. Further input is sought however, particularly regarding the specific questions outlined in the proposal above.
There is now a period for further comments until the final deadline on 4 May 2025, after which the recommended categorisations will be put forward to IUCN.
The final 2025 Red List categories will be published on the BirdLife and IUCN websites in October 2025, following further checking of information relevant to the assessments by both BirdLife and IUCN.
I understand that if there is no estimate of the number of mature individuals, but only suspected or inferred, criterion C cannot be used, not even to classify as NT. If there is no estimate of population size, criterion C does not apply, the species would be DD by this criterion.
The national assessment considered the species as LC because estimates of habitat loss carried out through remote sensing tools available on Google Engine (https://earthengine.google.com/) and MapBiomas (https://mapbiomas.org/), between 2010 and 2020, indicate that there was a loss of 1.9% in areas included in the categories of “Forest Formation” and “Savanna Formation” at altitudes between 750 and 1200 m, within the species’ distribution polygon, over 10 years.
However, the species can be considered NT by criterion B2, since the AOO calculated by the national assessment is 968 km², calculated based on georeferenced records and records inferred considering the potential habitat. There is a decline in habitat quality caused by deforestation of forests due to agricultural expansion and the spread of fires. However, the population is not fragmented, with most of its population occurring in the Chapada Diamantina National Park, and there are certainly more than 10 locations.
Many thanks to everyone who has contributed to this discussion. We greatly appreciate the time and effort invested in commenting. The window for consultation is now closed and we are unable to accept any more comments. We will analyse and interpret the information, and a final decision on this species’ Red List category will be posted on this page on 12 May 2025.
Recommended categorisation to be put forward to IUCN
We thank all contributors for their comments.
To be listed as threatened under Criterion C it is true that the population size must be estimated – it cannot be inferred or suspected (see IUCN Standards and Petitions Committee 2024). A listing as Near Threatened only requires a species to approach threatened thresholds however. Although not estimated, the population size threshold can be considered to be nearly met when the population size is suspected/inferred to be <10,000 mature individuals. The suspected population size in this instance is thus enough to qualify the species as Near Threatened under Criterion C, given there is also a suspected decline and likely less than 1,000 mature individuals in the largest subpopulation.
The final categorisation for this species has not changed. Bahia Tyrannulet is recommended to be listed as Near Threatened, approaching thresholds under Criterion C2a(i).
Many thanks for everyone who contributed to the 2025.2 GTB Forum process. The final Red List categories will be published on the BirdLife and IUCN websites in October 2025, following further checking of information relevant to the assessments by both BirdLife and IUCN.