Ceara Gnateater (Conopophaga cearae): Revise global status?

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1 Response to Ceara Gnateater (Conopophaga cearae): Revise global status?

  1. Diego Mendes Lima says:

    In the assessment of the risk of extinction of the Brazilian fauna carried out in 2016, the species was categorized as Endangered (EN), by criterion B2ab(ii,iii).

    Evaluators: Antonio Emanuel Barreto Alves de Sousa, Caio Graco Machado Santos, Diego Mendes Lima, Fabio de Paiva Nunes, Helder Farias Pereira de Araújo, Juan Manuel Ruiz-Esparza Aguilar, Leonardo Fernandes França, Márcio Amorim Efe, Marcos Persio Dantas Santos, Rachel Maria de Lyra Neves, Weber Andrade de Girão e Silva e Santos D’Angelo Neto.

    Criterion A – in the 2016 assessment, we did not find long-term population estimates data to track the decline by observed data (a) and the decline in AOO and EOO (c) do not reach the thresholds for a threat category. Habitat loss calculations performed with tools available on MapBioma (https://mapbiomas.org/) in the generational time of the species does not reach the population reduction threshold due to habitat loss in its range.

    Criterion B – The EOO calculations (430,770 km2) do not meet the thresholds for categorizing as threatened. However, its AOO (456 km2), calculated by superimposing a grid with 4 km2 grid squares to the current confirmed, inferred and suspected record points, adding the grid area, meets the Endangered category threshold (EN), by the B2ab(ii,iii) criterion. The species occurs in a severely fragmented forest matrix with more than 50% of its population separated by a great distance, with no gene flow. There are local extinctions in Ceará, Paraíba, Pernambuco and Alagoas in fragments where the species is no longer registered. In addition, there is a continued decline in population due to the loss of occupied area and habitat quality due to human activities, especially agriculture, urban expansion and forest fires. The population recently found in Serra do Machado, Ceará, is probably doomed to extinction: according to a recent survey by the Northeastern Society of Ecology, there are about ten forest fragments left, totaling just over 70 ha.

    Criterion C – in the assessment carried out in 2016, we did not find observed, estimated, projected and inferred data on the number of mature individuals and respective population decline.

    Criterion D – in the assessment carried out in 2016, we did not find population data on mature individuals and their AOO is greater than 20 km2

    Criterion E – in the evaluation carried out in 2016, we did not find PVA data.

    JUSTIFICATION: Conopophaga cearae is endemic to northeastern Brazil, distributed in Ceará, Paraíba, Pernambuco, Alagoas and Bahia. Its occupation area was calculated at 456 km2 including confirmed, inferred and suspected records. It inhabits humid forests in the lower strata of the forest. There are local extinctions in Ceará, Paraíba, Pernambuco and Alagoas in fragments where the species is no longer registered. The population is severely fragmented with more than 50% of its population separated by a great distance, with no gene flow. In addition, there is a continued decline in population due to the loss of occupied area and habitat quality due to human activities, especially agriculture, urban expansion and forest fires. Therefore, C. cearae was categorized as Endangered (EN) by the B2ab(ii,iii) criterion.

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