Archived 2010-2011 topics: Mantled Hawk (Leucopternis polionotus): request for information

Link to BirdLife species factsheet for Mantled Hawk

Mantled Hawk Leucopternis polionotus is listed as Near Threatened under criteria A2c; A3c; A4c; C1; C2a(i); D1 because it is thought to have a moderately small population which is suspected to be declining at a rate of 20-29% over 10 years owing to habitat loss and fragmentation.

The species appears to exist at very low densities, prompting Ferguson-Lees and Christie (2001) to infer that the total population is unlikely to exceed the uppermost hundreds. However, this seems unlikely given the estimated Extent of Occurrence of 640,000 km2. Such uncertainty has meant that the species is not listed as threatened on the basis of population size. In addition, no inferences have so far been made about the likely sub-population structure.

Information is requested on this species’s likely population size and sub-population structure, in particular the maximum number of individuals in any one sub-population or the percentage of all mature individuals that form a single sub-population. Further information is also requested on the likely population trend and the estimated rate of habitat loss and degradation. The species’s population trend should be estimated for a period of 23 years (estimate of three generations).

Ferguson-Lees, J. and Christie, D. A. (2001) Raptors of the world. London, UK: Christopher Helm.

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7 Responses to Archived 2010-2011 topics: Mantled Hawk (Leucopternis polionotus): request for information

  1. Rob Clay says:

    Leucopternis polionota was last recorded in Paraguay in 1989 (one along the río Carapá, Canindeyú department, sight record by Floyd Hayes and Tarsicio Granizo), itself the first record since Bertoni’s records in the early 1900s. Extensive fieldwork in the largest remaining blocks of forest (e.g. Mbaracayú Forest Nature Reserve, San Rafael, Itaipú reserves) has failed to record the species, and it is considered CR and possibly extinct at a national level.

  2. Adrian Eisen Rupp says:

    In the recent evaluation of conservation status of bird species in the state of Santa Catarina in southern Brazil, we classify Leucopternis polionotus as Near Threathened. The species is still found in good numbers in the montane forests and plateaus of the state. It is widespread in the 57,000 ha national park of Serra do Itajaí, and also have recent records in the Araucárias National Park, Sâo Joaquin National Park, Sassafrás Biological Reserve, and several places outside protected areas. The species seems to be adapted in systems with plantation forest (Pinus spp.) and native forest, as can seen in the PRNP Emilio Einsfeld Son, a private area that belongs to the company Forestal Gateados. In this area the Mantled Hawk is common in the cultivation of Pinus taeda, in wich some pairs are present.
    It is suspected that the territory of one pair is small but it is desirable to collect more information with specific methods, like GPS collar.

  3. I studied the Mantled Hawk in a 36000ha reserve of continuous semideciduous atlantic forest type, from 2004 to 2009. It was a part of my master thesis.
    Using spot mapping and distance estimates (compass, digital maps for accuracy, landscape and GPS coordinates from references), trough direct observation from the canopy (climbing techiniques), i mapped a MPC of the routes of the birds at three sample plots distantiated from 3-8 km. Besides that two of those plots were “defended” (records on pairs presenting territorial behavior).
    Therefore it was estimate 1-2 pairs of the Mantled Hawk in a 4649 ha MPC due to movements between two plots, or, considering the area of the three plots (2,5 km radius), it would be 1-2 pairs in 7000 ha of semideciduous forest.

  4. Despite of 126 counts from canopy trees and hills adjacent to the reserve edge, only 9 routes were mapped for the MPC of the Mantled hawk, within 11 records .

  5. In the state of Bahia, municipialitie of Barro Preto, a pair together of the species was recorded at a given day. On the following day, another pair was also recorded together in an area approximateli 6 km away from the first. The forested hills on the area are quite conected, there are several Km’s of conected forested hills and their surroundings but are not contiguous forest, but quite highly conected on several areas and locations troughout the municipialitie. At both encounters photos of bad quality were taken, but they will be evaluated to even differ the individuals trough probable differences on moults. Regardless its quite conservative to infer that its regard two different pairs apart from at least 6 km.

  6. The master thesis early comented was supported by The Peregrine Fund and Federal University of Ouro Preto, Minas Gerais, Brasil.

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