6 thoughts on “Black-banded Plover (Charadrius thoracicus)”
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.
Information received by email during this forum process indicates that new data on the species’ population size and trend may become available in the near future. Therefore, our proposal for the 2023 Red List is to pend the decision on this species and keep the discussion open, while leaving the current Red List category unchanged in the 2023 update.
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.
We have more than 10 years of data about the nest prédation rates of this species breeding at Andavadoaka between 2009 and 2023, justifying that high nest predation led to reduced nesting success and constituted therefore the main threat for the populations.
Since there is not yet new data justifying if the population trend is in decreasing or stable or increasing, I think it’s still better to keep the same current status IUCN (vulnerable) of the species until we’ll get new estimation. Downlisting to NT the current category vulnerable of species needs justification data that the species became common or not in decreasing at all. Suspected decreasing population trends would not mean the population became less threatened or more abundant without a justification data. I prefer to keep the previous status untill getting new estimation.
I’ll apply ABC grant this month for making a national reassessment of populations between October and December 2023. Results from this survey (new distribution sites and number of individuals per site) will enable us to predict new population trend using 10 years breeding ecology data (survival of adults and juveniles and productivity) from Andavadoaka.
Good decision to stand by the status of this species as vulnerable in waiting this new estimation.
The available information does not allow for a population trend analysis but it is more probable that the global population of the species tends to decrease over time. Sharing data on three important sites monitored by Asity Madagascar team and frequented by the species will support this opinion as follow:
– Mahavavy delta: 74 individuals (in 2006), 68 ind. (2011), 64 ind (2017)
– Marambitsy bay: 64 ind (2021), no bird seen in 2022
– Mangoky estuaries: 281 ind (2009), 162 ind (2011), 140 ind (2012), 381 ind (2014) and 53 ind (2019), 28 ind (2020)
For other visited sites frequented by the species, the number of recorded birds is lower:
– Baly Bay: from 4 to 45 individuals from 2000 – 2013 (mean =16 more or less 11 ind / 13 years of monitoring). Suspect of population decrease according to its habitat loss
– Besalampy at Sambao river and its estuary: 40 ind (2018)
– Bombetoka bay: 4 ind (2017)
– Lac Bedo: 4 ind (2017)
I suspect that the global population is lower than 2300 mature individuals. The main threat is the habitat loss.
The population remain very low. so I suggest to keep the actual status as Vulnerable.
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
Following further review, the recommended categorisation for this species has been changed.
The data obtained, thanks to the comments made during the final discussion, show substantial declines at some sites, with no indication of compensating increases at other sites. This gives enough information to infer a continuing decline in the species’ global population size. Moreover, given this information, it is concluded that the population size is indeed likely to now be lower than that estimated in 2007. The threat of habitat loss, which has been considered less impactful than predation and low breeding success, but highlighted as important in the above comments, will be given more weight in the species factsheet.
Based on recent research, the population is currently considered to comprise two subpopulations, however this is highly uncertain. The available information on population size and trend, and number of subpopulations, leads to the conclusion that the largest subpopulation is unlikely to contain more than 1,000 mature individuals.
Black-banded Plover is therefore now recommended to be retained as Vulnerable under Criterion C2a(i).
We strongly support urgent research into the population size and trend of this species, as well as the search for new occupied sites, as proposed in this discussion. We also recommend additional research on the threats the species faces (particularly for determining the current scope and impact of habitat loss), and more research on movements and gene flow is urgently required.
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.
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
Information received by email during this forum process indicates that new data on the species’ population size and trend may become available in the near future. Therefore, our proposal for the 2023 Red List is to pend the decision on this species and keep the discussion open, while leaving the current Red List category unchanged in the 2023 update.
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.
We have more than 10 years of data about the nest prédation rates of this species breeding at Andavadoaka between 2009 and 2023, justifying that high nest predation led to reduced nesting success and constituted therefore the main threat for the populations.
Since there is not yet new data justifying if the population trend is in decreasing or stable or increasing, I think it’s still better to keep the same current status IUCN (vulnerable) of the species until we’ll get new estimation. Downlisting to NT the current category vulnerable of species needs justification data that the species became common or not in decreasing at all. Suspected decreasing population trends would not mean the population became less threatened or more abundant without a justification data. I prefer to keep the previous status untill getting new estimation.
I’ll apply ABC grant this month for making a national reassessment of populations between October and December 2023. Results from this survey (new distribution sites and number of individuals per site) will enable us to predict new population trend using 10 years breeding ecology data (survival of adults and juveniles and productivity) from Andavadoaka.
Good decision to stand by the status of this species as vulnerable in waiting this new estimation.
The available information does not allow for a population trend analysis but it is more probable that the global population of the species tends to decrease over time. Sharing data on three important sites monitored by Asity Madagascar team and frequented by the species will support this opinion as follow:
– Mahavavy delta: 74 individuals (in 2006), 68 ind. (2011), 64 ind (2017)
– Marambitsy bay: 64 ind (2021), no bird seen in 2022
– Mangoky estuaries: 281 ind (2009), 162 ind (2011), 140 ind (2012), 381 ind (2014) and 53 ind (2019), 28 ind (2020)
For other visited sites frequented by the species, the number of recorded birds is lower:
– Baly Bay: from 4 to 45 individuals from 2000 – 2013 (mean =16 more or less 11 ind / 13 years of monitoring). Suspect of population decrease according to its habitat loss
– Besalampy at Sambao river and its estuary: 40 ind (2018)
– Bombetoka bay: 4 ind (2017)
– Lac Bedo: 4 ind (2017)
I suspect that the global population is lower than 2300 mature individuals. The main threat is the habitat loss.
The population remain very low. so I suggest to keep the actual status as Vulnerable.
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
Following further review, the recommended categorisation for this species has been changed.
The data obtained, thanks to the comments made during the final discussion, show substantial declines at some sites, with no indication of compensating increases at other sites. This gives enough information to infer a continuing decline in the species’ global population size. Moreover, given this information, it is concluded that the population size is indeed likely to now be lower than that estimated in 2007. The threat of habitat loss, which has been considered less impactful than predation and low breeding success, but highlighted as important in the above comments, will be given more weight in the species factsheet.
Based on recent research, the population is currently considered to comprise two subpopulations, however this is highly uncertain. The available information on population size and trend, and number of subpopulations, leads to the conclusion that the largest subpopulation is unlikely to contain more than 1,000 mature individuals.
Black-banded Plover is therefore now recommended to be retained as Vulnerable under Criterion C2a(i).
We strongly support urgent research into the population size and trend of this species, as well as the search for new occupied sites, as proposed in this discussion. We also recommend additional research on the threats the species faces (particularly for determining the current scope and impact of habitat loss), and more research on movements and gene flow is urgently required.
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.