5 thoughts on “Bay-ringed Tyrannulet (Phylloscartes sylviolus)”
I don’t have any personal experience of this species. However, looking at observations on eBird and WikiAves, there appears to be worrying evidence of a substantial contraction in range in recent decades: certainly more than 30% over the last 30 years; but it would need a proper analysis to confirm if it approaches or exceeds 30% over the last ten years.
The species has all but disappeared from eastern Paraguay, with only a single record since 2017 (eBird). In the northern part of the range, it appears to have also largely disappeared, with only old records from Bahia (1995, WikiAves), a single record from NE Minas Gerais (2015, WikiAves), no recent citizen science records from Espirito Santo (two published records are shown in the SALVE database*), and no records from most of Rio de Janeiro state.
It is also basically now absent, except in a couple of forest fragments, from most of the state of Paraná, following decades of deforestation, which leaves little suitable habitat except in the extreme west and east. Its global range is now restricted to two disjunct stronholds, in Misiones (Argentina) and the Serra do Mar (Brazil).
The species is currently listed as LC on the Brazilian National Red List, and is reported as being difficult to detect and likely under-recorded. Despite this, the evidence for a relatively recent dramatic range contraction appears strong.
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 temporarily closed and we are unable to accept any more comments until 6 February 2023. We will now analyse and interpret new information, and we will post a preliminary decision on this species’ Red List status on this page on 6 February 2023, when discussions will re-open.
Following comments received here, the species’ range map has been revised based on records on WikiAves, SALVE and eBird. EOO, AOO and rate of tree cover loss have been recalculated; nevertheless, there is currently no evidence for population declines exceeding 20% over ten years.
Therefore, based on available information, our preliminary proposal for the 2023 Red List would be to adopt the proposed classifications outlined in the initial forum discussion.
There is now a period for further comments until the final deadline on 12 February 2023, after which the recommended categorisations will be put forward to IUCN.
The final 2023 Red List categories will be published on the BirdLife and IUCN websites in December 2023, following further checking of information relevant to the assessments by both BirdLife and IUCN.
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 available information, and we will post a final decision on this species’ Red List status on this page on 20 February 2023.
Recommended categorisation to be put forward to IUCN
The final categorisation for this species has not changed. Bay-ringed Tyrannulet is recommended to be listed as Least Concern.
Many thanks for everyone who contributed to the 2023.1 GTB Forum process. The final 2023 Red List categories will be published on the BirdLife and IUCN websites in December 2023, following further checking of information relevant to the assessments by both BirdLife and IUCN.
I don’t have any personal experience of this species. However, looking at observations on eBird and WikiAves, there appears to be worrying evidence of a substantial contraction in range in recent decades: certainly more than 30% over the last 30 years; but it would need a proper analysis to confirm if it approaches or exceeds 30% over the last ten years.
The species has all but disappeared from eastern Paraguay, with only a single record since 2017 (eBird). In the northern part of the range, it appears to have also largely disappeared, with only old records from Bahia (1995, WikiAves), a single record from NE Minas Gerais (2015, WikiAves), no recent citizen science records from Espirito Santo (two published records are shown in the SALVE database*), and no records from most of Rio de Janeiro state.
It is also basically now absent, except in a couple of forest fragments, from most of the state of Paraná, following decades of deforestation, which leaves little suitable habitat except in the extreme west and east. Its global range is now restricted to two disjunct stronholds, in Misiones (Argentina) and the Serra do Mar (Brazil).
The species is currently listed as LC on the Brazilian National Red List, and is reported as being difficult to detect and likely under-recorded. Despite this, the evidence for a relatively recent dramatic range contraction appears strong.
* For PDF of the Brazilian National Red List Assessment for this species, see: https://doi.org/10.37002/salve.ficha.24611
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 temporarily closed and we are unable to accept any more comments until 6 February 2023. We will now analyse and interpret new information, and we will post a preliminary decision on this species’ Red List status on this page on 6 February 2023, when discussions will re-open.
Preliminary proposal
Following comments received here, the species’ range map has been revised based on records on WikiAves, SALVE and eBird. EOO, AOO and rate of tree cover loss have been recalculated; nevertheless, there is currently no evidence for population declines exceeding 20% over ten years.
Therefore, based on available information, our preliminary proposal for the 2023 Red List would be to adopt the proposed classifications outlined in the initial forum discussion.
There is now a period for further comments until the final deadline on 12 February 2023, after which the recommended categorisations will be put forward to IUCN.
The final 2023 Red List categories will be published on the BirdLife and IUCN websites in December 2023, following further checking of information relevant to the assessments by both BirdLife and IUCN.
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 available information, and we will post a final decision on this species’ Red List status on this page on 20 February 2023.
Recommended categorisation to be put forward to IUCN
The final categorisation for this species has not changed. Bay-ringed Tyrannulet is recommended to be listed as Least Concern.
Many thanks for everyone who contributed to the 2023.1 GTB Forum process. The final 2023 Red List categories will be published on the BirdLife and IUCN websites in December 2023, following further checking of information relevant to the assessments by both BirdLife and IUCN.