Atlantic Woodcreeper (Xiphorhynchus atlanticus): Revise global status?

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1 Response to Atlantic Woodcreeper (Xiphorhynchus atlanticus): Revise global status?

  1. Diego Mendes Lima says:

    In the assessment of the risk of extinction of the Brazilian fauna carried out in 2019, the species was categorized as Vulnerable (VU) by criterion C2a(i).

    Evaluators: Caio Graco Machado Santos, Diego Mendes Lima, Ciro Ginez Albano, Glayson Ariel Bencke, José Fernando Pacheco, Luís Fábio Silveira, Vítor de Queiroz Piacentini and Wagner Nogueira Alves.

    Criterion A – in the 2019 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 calculations of AOO (2,144 km2) with inferred and suspected records and EOO (167,142 km2) do not meet the thresholds for categorizing as threatened.

    Criterion C – Considered common in Serra de Baturité, Ceará, where 43.7 and 62.5 individuals/100 hours of observation were recorded in two different locations (Albano & Girão, 2008). Of 15 fragments studied in Alagoas, it was found in only two (Aleixo, 2008). CEMAVE/ICMBio has developed systematic studies aimed at obtaining data to estimate population density in several forest remnants in the State of Paraíba. In the Guaribas Biological Reserve, between 2018 and 2019, the population density of X. atlanticus was 0.14 individuals/ha. Considering only the area of ​​rainforest existing in the Rebio Guaribas of 3,200 ha, 448 individuals can be estimated for the area (Diego Mendes, pers. comm., 2019). Habitat fragmentation can isolate populations, as the species has little mobility outside the forest matrix, resulting in continued population decline due to habitat loss. Based on the population estimate data presented in the Rebio Guaribas, we can infer that within the species’ area of ​​occurrence the population is 6,500-9,999 mature individuals, and that its subpopulations have less than 1,000 mature individuals.

    Criterion D – the population size was estimated at 6,500-9,999 mature individuals and does not meet the thresholds for categorizing as threatened and its AOO is greater than 20 km2.

    Criterion E – in the assessment carried out in 2019, we did not find PVA data.

    JUSTIFICATION: Xiphorhynchus atlanticus is endemic to Brazil, with occurrence restricted to the northeast of the country (Ceará, Paraíba, Pernambuco and Alagoas). Considering that its distribution area is very well sampled and using population estimates data obtained from the Guaribas Biological Reserve, it is safe to infer that there are less than 10,000 mature individuals and that each subpopulation contains less than 1,000 individuals. Habitat fragmentation isolates populations, as the species has little mobility outside the forest matrix, resulting in continued population decline due to the loss of occupied area and habitat quality. Therefore, X. atlanticus was categorized as Vulnerable (VU) by the C2a(i) criterion.

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