A few comments on the text above :
– “Chikara” who is cited several times in Annex 1 should be referred to by his surname instead, Otani.
– The “EOO”, or breeding range, estimate looks quite wrong at 2,110,000 sq km. JPP breeds in South and Central Japan (a country of c 378,000 sq km), South Korea (c 100,000 sq km), southernmost North Korea (c 120,000 sq km), Lanyu and Batanes (which combined size is c 250 sq km). So the EOO can’be be higher than 500,000 sq km (and the AOO much smaller if you discount unsuitable areas such as cities, agricultural land, areas above 1000m elevation etc…).
Now on the status of the bird itself, it appears to be fairly common IN SUITABLE HABITAT, and does not show signs of a declining trend WHERE FOUND over the last couple of years.
But because JPP breeds in forested lowlands and lower hills (as per Otani, up to c 1000m elevation), its habitat in Japan is fragmented and more vulnerable to clearance linked to potential infrastructure development (for example small scale solar panel plants) , especially in the southern part of its range where density appears largest (Nansei Shoto and Kyushu).
I’d think more precise data is needed to properly assess the AOO of this species, and evaluate the ongoing and future trends with respect to its breeding habitat, in order to make a judgement on a possible change of its conservation status.
Many thanks to all those who contribute to this work.
YM
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 26 June 2023. We will now analyse and interpret the new information, and we will post a preliminary decision on this species’ Red List status on this page on 26 June 2023, when discussions will re-open.
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. To address the comment made by Yann Muzika on 15/06/2023:
The incorrect citation of ‘Chikara’ has now been corrected. The EOO value used here (2,110,000 km2) is correct. Per the IUCN Red List Guidelines, an extent of occurrence value is calculated by drawing a minimum convex polygon around the species’ mapped range; the area value resulting from this includes all unoccupied area (including ocean); the scientific justification for this is available in the Red List Guidelines (pp. 49-52). The AOO is then calculated as the occupied subset of this area and represents an alternative range metric. As noted in the comment, the data are currently too poor to generate a reliable AOO value for Japanese Paradise-flycatcher, and it is currently recorded as ‘Unknown’. There is no doubt that with perfect information, the AOO of this species would be considerably lower than the EOO, although a very cursory exercise reveals it likely to be over 2,000 km2 (the threshold for listing as Threatened under Criterion B2). We agree that more precise data are needed to assess the AOO of this species, and accordingly leave this value recorded as Unknown. The ongoing trends information is inferred from atlas data, a study on Lanyu, and satellite land cover data, although it is acknowledged all three of these sources have limitations. Nonetheless, extinction risk assessments are carried out employing the best available data and reasonable assumptions. In the absence of evidence suggesting this species is at risk, the current proposal of Least Concern is therefore upheld, although we are open to further input and comment. In particular, any evidence of local declines (and the factors driving them) is sought. The comment that this species may, in the future (noting an IUCN Red List assessment is based on the species’ current extinction risk) be at risk from developments because of the fragmentation of suitable habitat has been noted and is now mentioned in the draft species account to be published in December 2023.
There is now a period for further comments until the final deadline on 2 July 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 the information, and we will post a final decision on this species’ Red List status on this page on 10 July 2023.
Recommended categorisation to be put forward to IUCN
The final categorisation for this species has not changed. Japanese Paradise-flycatcher is recommended to be listed as Least Concern.
Many thanks for everyone who contributed to the 2023.2 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.
A regular, and presumably previously overlooked, passage migrant in Cambodia.
A few comments on the text above :
– “Chikara” who is cited several times in Annex 1 should be referred to by his surname instead, Otani.
– The “EOO”, or breeding range, estimate looks quite wrong at 2,110,000 sq km. JPP breeds in South and Central Japan (a country of c 378,000 sq km), South Korea (c 100,000 sq km), southernmost North Korea (c 120,000 sq km), Lanyu and Batanes (which combined size is c 250 sq km). So the EOO can’be be higher than 500,000 sq km (and the AOO much smaller if you discount unsuitable areas such as cities, agricultural land, areas above 1000m elevation etc…).
Now on the status of the bird itself, it appears to be fairly common IN SUITABLE HABITAT, and does not show signs of a declining trend WHERE FOUND over the last couple of years.
But because JPP breeds in forested lowlands and lower hills (as per Otani, up to c 1000m elevation), its habitat in Japan is fragmented and more vulnerable to clearance linked to potential infrastructure development (for example small scale solar panel plants) , especially in the southern part of its range where density appears largest (Nansei Shoto and Kyushu).
I’d think more precise data is needed to properly assess the AOO of this species, and evaluate the ongoing and future trends with respect to its breeding habitat, in order to make a judgement on a possible change of its conservation status.
Many thanks to all those who contribute to this work.
YM
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 26 June 2023. We will now analyse and interpret the new information, and we will post a preliminary decision on this species’ Red List status on this page on 26 June 2023, when discussions will re-open.
Preliminary proposal
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. To address the comment made by Yann Muzika on 15/06/2023:
The incorrect citation of ‘Chikara’ has now been corrected. The EOO value used here (2,110,000 km2) is correct. Per the IUCN Red List Guidelines, an extent of occurrence value is calculated by drawing a minimum convex polygon around the species’ mapped range; the area value resulting from this includes all unoccupied area (including ocean); the scientific justification for this is available in the Red List Guidelines (pp. 49-52). The AOO is then calculated as the occupied subset of this area and represents an alternative range metric. As noted in the comment, the data are currently too poor to generate a reliable AOO value for Japanese Paradise-flycatcher, and it is currently recorded as ‘Unknown’. There is no doubt that with perfect information, the AOO of this species would be considerably lower than the EOO, although a very cursory exercise reveals it likely to be over 2,000 km2 (the threshold for listing as Threatened under Criterion B2). We agree that more precise data are needed to assess the AOO of this species, and accordingly leave this value recorded as Unknown. The ongoing trends information is inferred from atlas data, a study on Lanyu, and satellite land cover data, although it is acknowledged all three of these sources have limitations. Nonetheless, extinction risk assessments are carried out employing the best available data and reasonable assumptions. In the absence of evidence suggesting this species is at risk, the current proposal of Least Concern is therefore upheld, although we are open to further input and comment. In particular, any evidence of local declines (and the factors driving them) is sought. The comment that this species may, in the future (noting an IUCN Red List assessment is based on the species’ current extinction risk) be at risk from developments because of the fragmentation of suitable habitat has been noted and is now mentioned in the draft species account to be published in December 2023.
There is now a period for further comments until the final deadline on 2 July 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 the information, and we will post a final decision on this species’ Red List status on this page on 10 July 2023.
Recommended categorisation to be put forward to IUCN
The final categorisation for this species has not changed. Japanese Paradise-flycatcher is recommended to be listed as Least Concern.
Many thanks for everyone who contributed to the 2023.2 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.