Bare-throated Bellbird (Procnias nudicollis): downlist from Vulnerable to Near Threatened?

This discussion was first published as part of the 2016 Red List update. At the time a decision regarding its status was pended, but to enable potential reassessment of this species as part of the 2017 Red List update this post remains open and the date of posting has been updated.

BirdLife species factsheet for Bare-throated Bellbird

Bare-throated Bellbird is endemic to the Atlantic forest (Snow and Sharpe 2016). It is found in eastern Brazil, north-eastern Argentina and eastern Paraguay. The species is listed as Vulnerable under A2cd+3cd+4cd. The population is provisionally estimated at 2,500-9,999 mature individuals and a rapid and on-going population decline is suspected owing to habitat loss and trapping for the cage-bird trade.

The population has unquestionably declined owing to deforestation and heavy trapping pressure for the cage-bird trade, particularly in Brazil (Brooks et al. 1993, Tobias et al. 1993, Ridgely and Tudor 1994, M. Guimarães Diniz in litt. 2003). Trapping pressure may be particularly heavy in southern Bahia, São Paulo and Santa Catarina and the population size is therefore difficult to assess in these areas (F. Olmos in litt. 2003). Numerous individuals were seen in cages between Serra das Lontras and Una Biological Reserve, southern Bahia (A. C. De Luca in litt. 2007). In north-east Paraguay deforestation was 20% between 1997 and 2001, and appears to be continuing at a similar rate. The Paraguayan population is also coming under increasing pressure from trapping (historically a localised threat), with both males and females readily available in Asunción every year. Agricultural conversion and deforestation for mining and plantation production historically threatened its habitat (Fearnside 1996). Key threats are urbanisation, industrialisation, agricultural expansion, colonisation and associated road-building (Dinerstein et al. 1995).

In the Brazilian Red List assessment for birds (MMA 2014) this species is listed as Near Threatened.

Information on the species’s population size and trends in Paraguay and Argentina is sought. Is the population size reduction likely to be <30% over 14 years (three generations)?

The species was previously considered Near Threatened but was uplisted to Vulnerable in 2004 owing to increased awareness of rapid rates of habitat destruction and trapping pressure (Snow and Sharpe 2016). Based on the Brazilian Red List assessment of this species, should the species now be considered Near Threatened globally? Confirmation that the rate of population reduction is likely to be <30% over 14 years could qualify the species for downlisting to Near Threatened under criterion A2cd+3cd+4cd.

 

Comments on the proposed downlisting are welcome.
References:

Brooks, T. M.; Barnes, R.; Bartrina, L.; Butchart, S. H. M.; Clay, R. P.; Esquivel, E. Z.; Etcheverry, N. I.; Lowen, J. C.; Vincent, J. 1993. Bird surveys and conservation in the Paraguayan Atlantic forest: Project CANOPY ’92 final report. BirdLife International, Cambridge, U.K.

Dinerstein, E.; Olson, D. M.; Graham, D. J.; Webster, A. L.; Primm, S. A.; Bookbinder, M. P.; Ledec, G. 1995. A conservation assesssment of the terrestrial ecoregions of Latin America and the Caribbean. World Bank, Washington, D.C.

Fearnside, P. 1996. Brazil. In: Harcourt, C.S.; Sayer, J.A. (ed.) The conservation atlas of tropical forests: the Americas, pp. 229-248. Simon & Schuster, New York and London.

MMA (2014) Lista Nacional Oficial de Espécies da Fauna Ameaçadas de Extinção. Portaria No 444, de 17 de dezembro de 2014. Diário Oficial da União – Seção 1. Nº 245, quinta-feira, 18 de dezembro de 2014.

Snow, D. & Sharpe, C.J. (2016). Bare-throated Bellbird (Procnias nudicollis). In: del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.). Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona.

Tobias, J. A.; Catsis, M. C.; Williams, R. S. R. 1993. Notes on scarce birds observed in southern and eastern Brazil: 24 July – 7 September 1993.

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5 Responses to Bare-throated Bellbird (Procnias nudicollis): downlist from Vulnerable to Near Threatened?

  1. Rob Clay says:

    In Paraguay the species is primarily found in the northern part of Eastern Paraguay, in Atlantic Forest in Canindeyú and San Pedro departments, with a few birds also recorded in gallery forest in the Cerrado of Concepcion department. The only population which seems likely to be healthy is that found within the 64,000 ha Reserva Natural del Bosque Mbaracayú in Canindeyú department (which has about 57,000 ha of forest). All other forest areas within its range in NE Paraguay are small, degraded and increasily fragmented/isolated. Although there is a Zero Deforestation law in effect in Eastern Paraguay, illegal forest clearance and timber extraction still occurs (perhaps especially within the range of the species). At least in recent decades, the species appears to have always been uncommon to rare in the forests of SE and easternmost Paraguay – and there have been few, if any, records of the species in this area in recent years. The species still occurs in trade. For instance, I recently saw a photo of an immature male at a private zoo, which can only have come from the wild in recent years.

  2. I’m not familiar with the situation on the Brazilian coast, but in the interior Atlantic forest (Argentina, Paraguay) everything indicates that the population is declining (especially because of deforestation in Paraguay and lack of reserves, destruction of sites like Yaguareté Forest where there were good populations 15 years ago). It is very rare in Argentina, only appears at certain times of year, apparently passing through. So the parks and reserves in the province of Misiones (Argentina) are only contributing to movements (of a few individuals) and not to stable populations. I don’t think it should be downlisted; in this part of the world, it should be “endangered”.

  3. James Westrip (BirdLife) says:

    Based on available information, our proposal for the 2016 Red List would be to pend the decision on this species and keep this discussion open until 2017, while leaving the current Red List category unchanged in the 2016 update.

    Final 2016 Red List categories will be published on the BirdLife and IUCN websites in early December, following further checking of information relevant to the assessments by both BirdLife and IUCN.

  4. Kevin M. Flesher says:

    This species is abundant in parts of our reserve, especially in the Pacange forest (part of 13,000 ha forest that extends beyond the 3400 ha Reserva Ecologica Michelin). On days when the birds are actively calling, one can hear them throughout the forest, using all forest habitats from lightly logged primary forest to young (14-18 year old) secondary forest. The reserve consists of three principal forest fragments and suffered intensive hunting and bird capturing pressure as recently as 2005, but we have since been able to eliminate most of this pressure, reducing the impact to the forest edge. Prior to the creation of the reserve I did not hear bell birds calling in the Pancada Grande, Vila 5 or Luis Inacio forests and it has taken a decade for them to re-colonize these forests, even though the fragmentation distances between the reserve forests is no more than 400 m and the matrix one of rubber plantations (now abandoned). Recently (staring in 2016) I have noticed that bell birds are calling throughout the Luis Inacio and Vila 5 forests, but I have yet to hear them in the Pancada Grande forest (which is closer to the highway, towns, and has a dense rural population along its boundary). My conclusions in our reserve are: 1. that the species appears to adapt well to secondary forest in all stages of development; 2. can apparently reach high population abundances in the mosaic of secondary and heavily logged forests; 3. can recover well with protection, but that this takes some time – a decade in this case and still ongoing; 4. that the species appears to be able to cross a matrix of rubber groves, although I have never seen or heard it in this habitat; 5. is not, as of yet, inhabiting the abandoned rubber groves, even with an effective guard patrol system.

    People continue to trap the species in the region and periodically I hear caged birds calling in the town of Itubera (although it has been a few years now that I have not heard any in town). However, it seems that the birds do not last long in captivity as the calling stops from particular houses after several months. Whether the bird dies or people sell them I do not know. No state or federal environmental law enforcement in the region. I have no information on bell birds from other forests in the region as I have mostly worked in the reserve forests over this past decade.

  5. Hannah Wheatley (BirdLife) says:

    Preliminary proposals

    Based on available information, our proposal for the 2017 Red List would be to pend the decision on this species and keep this discussion open until 2018, while leaving the current Red List category unchanged in the 2017 update.

    Final 2017 Red List categories will be published on the BirdLife and IUCN websites in early December, following further checking of information relevant to the assessments by both BirdLife and IUCN.

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