5 thoughts on “Yungas Tyrannulet (Phyllomyias weedeni)”
There are currently no population trend data available for this species in Bolivia. However, significant and increasing threats to its habitat raise serious concerns. Historically, the Yungas forests were largely unaffected by fire. This is no longer the case. These forests are now increasingly threatened by large-scale, human-induced wildfires, a trend exacerbated by climate change and extended dry seasons. The intense El Niño-driven dry season of 2023 and 2024 resulted in widespread fires that affected large areas of Yungas forest, including regions previously not known to experience burning.
Additionally, areas of previously inaccessible Yungas forest are undergoing rapid transformation. Expanding infrastructure, including new roads built to connect remote communities or to access areas for illegal gold mining, is facilitating human encroachment into intact habitats. This increase in human presence leads to fragmentation and edge effects, which in turn accelerate habitat degradation and further increase the risk of fire.
These cumulative and intensifying threats—including fire, habitat fragmentation, and infrastructure expansion—must be fully considered in the evaluation of this species’ conservation status.
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 T. Boorsma for their helpful comment above. The information on the threats to this species’ habitat will be incorporated into the updated Red List assessment. Based on this, and in light of accelerating rates of tree cover loss within the range (Global Forest Watch 2025), the upper bound of the suspected rate of decline has been increased to 15% over ten years. There is currently no evidence that the species is declining at a rate that meets or approaches threatened thresholds under Criterion A however.
In the absence of data to estimate the population size or infer a decline (the population size and trend remain only suspected, thus not meeting the required data quality thresholds for a threatened listing sensu IUCN Guidelines), it continues to approach – but does not meet – threatened thresholds under Criterion C. 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.
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.
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
The final categorisation for this species has not changed. Yungas Tyrannulet is recommended to be listed as Near Threatened, approaching thresholds under Criterion C2a(ii).
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.
There are currently no population trend data available for this species in Bolivia. However, significant and increasing threats to its habitat raise serious concerns. Historically, the Yungas forests were largely unaffected by fire. This is no longer the case. These forests are now increasingly threatened by large-scale, human-induced wildfires, a trend exacerbated by climate change and extended dry seasons. The intense El Niño-driven dry season of 2023 and 2024 resulted in widespread fires that affected large areas of Yungas forest, including regions previously not known to experience burning.
Additionally, areas of previously inaccessible Yungas forest are undergoing rapid transformation. Expanding infrastructure, including new roads built to connect remote communities or to access areas for illegal gold mining, is facilitating human encroachment into intact habitats. This increase in human presence leads to fragmentation and edge effects, which in turn accelerate habitat degradation and further increase the risk of fire.
These cumulative and intensifying threats—including fire, habitat fragmentation, and infrastructure expansion—must be fully considered in the evaluation of this species’ conservation status.
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 T. Boorsma for their helpful comment above. The information on the threats to this species’ habitat will be incorporated into the updated Red List assessment. Based on this, and in light of accelerating rates of tree cover loss within the range (Global Forest Watch 2025), the upper bound of the suspected rate of decline has been increased to 15% over ten years. There is currently no evidence that the species is declining at a rate that meets or approaches threatened thresholds under Criterion A however.
In the absence of data to estimate the population size or infer a decline (the population size and trend remain only suspected, thus not meeting the required data quality thresholds for a threatened listing sensu IUCN Guidelines), it continues to approach – but does not meet – threatened thresholds under Criterion C. 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.
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.
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
The final categorisation for this species has not changed. Yungas Tyrannulet is recommended to be listed as Near Threatened, approaching thresholds under Criterion C2a(ii).
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.