White-breasted Antbird (Rhegmatorhina hoffmannsi): Revise global status?

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1 Response to White-breasted Antbird (Rhegmatorhina hoffmannsi): Revise global status?

  1. Diego Mendes Lima says:

    In the assessment of the risk of extinction of the Brazilian fauna carried out in 2018, the species was categorized as Vulnerable (VU), according to the A4c criterion.

    Evaluators: Alexander Charles Lees, Alexandre Luis Padovan Aleixo, Diego Mendes Lima, Edson Varga Lopes, Luís Fábio Silveira, Mario Eric Cohn Haft, Pablo Vieira Cerqueira e Vítor de Queiroz Piacentini.

    Criterion A – Species considered locally common (Stotz et al., 1996). It is considered highly sensitive to human disturbance (Zimmer & Isler, 2003). The states of Rondônia and Mato Grosso have suffered extensive deforestation since 1980, due to agriculture (Zimmer & Isler, 2003).
    The population is suspected to be declining as a consequence of habitat destruction (Zimmer & Isler, 2003). The loss of deforested area (clear cut), calculated using MapBioma, was 6.7% in 14 years (three generations) in the past. The species is sensitive to disturbance, and even with falling deforestation rates (clear cutting), the disturbance rate (loss of habitat quality) inside the forest due to selective logging and fires leads to the species’ population decline. The loss of habitat quality within forests has been estimated at 25% for the future (Barlow et al., 2016) and assuming that deforestation rates (6.7%) will continue in the future, a population decline of at least 30% over the next 14 years (three generations). Meets Vulnerable (VU) categorization by A4c criteria.

    Generation time of 4.8 years (BirdLife International, 2009).

    Criterion B – The calculations of AOO (2,212 km2) and EOO (634,528 km2) do not meet the thresholds for categorizing as threatened.

    Criterion C – in the assessment carried out in 2018, 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 2018, we did not find population data on mature individuals and their AOO is greater than 20 km2.

    Criterion E – in the 2018 assessment, we did not find PVA data.

    Justification: Rhegmatorhina hoffmannsi is endemic to the Madeira-Tapajós interfluve. From the loss of deforested area due to the construction of hydroelectric plants and agricultural expansion, mainly in the state of Rondônia, in the south of the state of Amazonas and in the north of Mato Grosso, as well as the loss of habitat quality due to selective deforestation and fires, a population decline of at least 30% is suspected over the next 14 years (three generations), based on the decline in habitat quality. Therefore, R. hoffmannsi was categorized as Vulnerable (VU) by the A4c criterion.

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