Archived 2011-2012 topics: White-mantled Barbet (Capito hypoleucus): downlist to Vulnerable?

Initial deadline for comments: 31 January 2012 [note that this has been moved back by about two months].

BirdLife species factsheet for White-mantled Barbet

White-mantled Barbet Capito hypoleucus is restricted to the northern Central Andes and western slope of the East Andes, Colombia, where it prefers lower montane forest, but also inhabits adjacent human-altered landscapes (Laverde-R et al. 2005). It is listed as Endangered under criterion B1a+b(i,ii,iii,v) on the basis that it has a very small and declining range, with an Extent of Occurrence (EOO) estimated at 3,700 km2, in which its habitat is severely fragmented and declining in area, extent and/or quality.

Given this species’s tolerance of habitat degradation and disturbance and its ability to occupy mosaics of forest and agricultural land, its habitat may not be considered severely fragmented according to the IUCN definition, i.e. over 50% in patches too small to support viable populations.

On this basis, it is proposed that the species be downlisted to Vulnerable under criterion C2a(i) because it has a small population, placed in the band 2,500-9,999 individuals, with all sub-populations numbering no more than 1,000 individuals, which is suspected to be in decline owing to continued habitat loss.

The rate of population decline is currently suspected to be 10-19% over 10 years, based on the rate of habitat loss, although the rate of habitat loss has recently been put at c.25% over 10-15 years (Fundación ProAves in press). BirdLife now estimates this species’s generation length at c.8.6 years, giving a three-generation trend period of c.26 years. This suggests that an appropriate estimate for the rate of decline would be 30-49% over three generations (Vulnerable under criterion A).  

Comments are invited on the proposal to downlist this species to Vulnerable and further information is requested on its status.

References:

Fundación ProAves (in press) The status of various threatened birds in Colombia. Conservación Colombiana.

Laverde-R., O., Múnera-R., C. and Renjifo, L. M (2005) Preferencia de hábitat por Capito hypoleucus, ave colombiana endémica y amenazada. Ornitol. Colomb. 3: 62-73.

Related posts:

  1. Archived 2010-2011 topics: Mantled Hawk (Leucopternis polionotus): request for information
  2. Chestnut-capped Piha (Lipaugus weberi): does it qualify as Critically Endangered?
  3. Archived 2011-2012 topics: Yellow-naped Amazon (Amazona auropalliata): is it eligible for uplisting?
  4. Archived 2010-2011 topics: Black Tinamou (Tinamus osgoodi): at least Vulnerable, or downlist to Near Threatened?
  5. Archived 2011-2012 topics: Grey-striped Francolin (Francolinus griseostriatus): downlist to Least Concern?
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5 Responses to Archived 2011-2012 topics: White-mantled Barbet (Capito hypoleucus): downlist to Vulnerable?

  1. esta especie hábitat principalmente áreas entre los 1200 a 1500, donde halla un habitar optimo para vivir (Laverde-R et al. 2005), del piedemonte de la cordillera oriental en sector del valle del magdalena. Pero este gradiente altitudinal, presenta altas tasas de deforestacion, por tanto el habitat de la especie se esta reduciendo. En exploraciones adelantadas por Procat a la serranía de las quinchas no registro a esta especie, dado que la minería había destruido gran cobertura forestal entre los 1000 a 14000 msnm. Por tanto no seria aconsejable descender de estatus de amenaza a esta especie dependiente de un gradiente tan estrecho de habitat y que continuamente esta siendo acabado.

  2. The in press ProAves paper mentioned above has now been published (Conservacion Colombiana 15: 22-28).

    “White–mantled Barbet Capito hypoleucus
    Capito hypoleucus is fairly common at many sites along the
    foothills and subtropics of the west slope of the Eastern
    Cordillera (e.g. Serranía de las Quinchas, Reserva El Paujíl,
    Serranía de los Yariguíes), Central Cordillera (eastern and
    northern slope) and Serranía de San Lucas (e.g. Stiles et al.
    1999, Salaman et al. 2002, Donegan et al. 2007, Cuervo et
    al. 2010). It occurs in small forest fragments (some evidence
    of tolerating fragmentation) although its habitat continues to
    decline (≈25% over 10–15 years). It may warrant
    considering for down–listing to Vulnerable (VU) using
    criteria A4c, C1.”

  3. I agree with Thomas on this one. The species is not rare wherever at least some forest remains, and I have seen it cross pastures (100m or more) to get to fruiting trees away from the nearest forest edge; it freely uses fruits of second-growth trees like Cecropia, Casearea and Cupania as well as those of primary forest. Oswaldo underestimates its altitudinal range as well: I have seen it as low as ca. 350-400m and as high as 1700m. I think that Vulnerable would be an appropriate category.

  4. En exploraciones llevadas a cabo en el 2010 (Losada et al., 2010) en Mariquita y Falan en el departamento del Tolima entre los 771 – 1051 m, la especie tuvó una baja abundancia, fue observada principalmente en pequeños parches de bosque y desplazandose principalmente a través de lineas de árboles que interconectan parches, en bordes de bosque o a través bosques de galeria; se observo cierta tendencia a evitar el paso a través de áreas de pastizal y de cultivos. El área relacionada se encuentra fuertemente fragmentada, además existe una alta tendencia a la explotación y sustracción de madera de los bosque relictuales que en su gran mayoria se encuentran en riveras de afluentes de agua y en zonas de alta pendiente; igualmente en general en el Tolima la fragmentación tiende aumentar hacia zonas bajas. Esta situación indudablemente puede estar afectando los procesos de dispersión de la especie a nivel local y en su areal de distribución; además, tal y como lo plantea Laverde et al,. (2005) la especie presenta preferencias a bosques primarios o poco intervenidos, lo que sugiere una dependencia marcada al bosque; además en la mayoria de reportes su ocurrencia en áreas antropogénicas esta sujeta a la presencia de bosques cercanos. Considero que faltan estudios más detallados de la historia de vida, principalmente los relacionados con el uso de microhabitats a través del paisaje, su presencia en áreas intervenidas puede ser una respuesta forzosa a la perdida del hábitat con un declive poblacional enmascarado. Estoy de acuerdo con Oswaldo Cortes en que no es aconsejable desender el estatus de amenaza de la especie.

    LOSADA – PRADO S., MOLINA – MARTÍNEZ Y. G., MORENO PALACIOS M. 2010. Aves. Pp. 291 – 439. Pp. En: REINOSO-FLOREZ, G., VILLA-NAVARRO, F.A., LOSADA-PRADO, S., GARCIA-MELO J.E., VEJARANO-DELGADO M.A. Y MOLINA – MARTÍNEZ Y. G. 2010 Biodiversidad Faunística Y Florística De La Cuenca Mayor Del Río Gualí, Biodiversidad Regional Fase VI. Grupo de Investigación en Zoología-Universidad del Tolima, Cortolima. Ibagué, Colombia.

  5. A. M. Cuervo says:

    I understand that much of this categorization is based on guesswork and opinion even in the complete absence of hard data but it will be desirable if the data analysis, model assumptions, and caveats around the estimates of “no more than 1,000 individuals” total population size, and the “≈25% over 10–15 years” are presented and discussed.

    This Capito is fairly common to uncommon and occurs at a relatively broad elevational range in heavily fragmented landscapes. Based on the same opinion-based categorization, one could conclude this is not a threatened species. It’s now known from way more localities than ever before (including modern records of its three described subspecies). The elevational range is locally up to 1,850 in the northern Central Andes (see below).

    “New distributional bird data from the Cordillera Central of the Colombian Andes, with implications for the biogeography of northwestern South America. Condor (2008) 110: 526-537 – 200”:

    “White-mantled Barbet (Capito hypoleucus). This Colombian endemic was fairly common in the canopy and forest edges between 1300 and 1600 m in Pradera (6), Bodega Vieja (14), and Finca Macondo (17) and was occasionally found up to 1850 m in the cloud forest of La Secreta (9). Two specimens taken (ICN 34414, 35171) in Bodega Vieja and La Secreta are referable to the nominate subspecies, whereas the Pradera population corresponds to the enigmatic subspecies carrikeri. In fact, Pradera is just 1.8 km southwest of the type locality for carrikeri, Botero (Fig. 1). Previously, the subspecies carrikeri was known only from the type specimen (Graves 1988), and the species was not known to occur above 1500 m (Múnera and Laverde 2002). Both Pradera (carrikeri) and the La Secreta-Bodega Vieja area in Amalfi (hypoleucus) lie along the Porce River valley, are separated by less than 36 km, and the habitat types used by the species in these two areas are, in general, the same. Densely spaced geographic sampling along the Porce River valley is needed to assess distributional limits and potential levels of intergradation between subspecies”

    Table 1 in that paper provides details of the localities and elevational range.

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