Archived 2018 topic: Northern Ground-hornbill (Bucorvus abyssinicus): request for information.

This discussion was first published as part of the 2017 Red List update. At the time a decision regarding the status of several was pended, but to enable potential reassessment of these species as part of the 2018 Red List update this post remains open and the date of posting has been updated.

BirdLife Species factsheet for Northern Ground-hornbill: http://datazone.birdlife.org/species/factsheet/northern-ground-hornbill-bucorvus-abyssinicus

 

Northern Ground-hornbill, Bucorvus abyssinicus, is currently listed as Least Concern because it has not been thought to approach the threshold for Vulnerable under any criterion. The species is found in the Afrotropics in a band across from Senegal through to the Horn of Africa, and most commonly inhabits savannah and sub-desert as well as possibly being found in riparian habitats and woodland (Borrow and Demey 2014, Dowsett-Lemaire and Dowsett 2014, Kemp and Boesman 2017). The population size has not been quantified, but despite being sparsely distributed across its large range it is not thought to approach the threshold for Vulnerable based on population size, and would not approach the threshold under range size.

At the moment Northern Ground-hornbill is listed as having a stable population trend. There are, however, suggestions that the population may actually be in decline; Borrow and Demey (2014) state that the species is ‘probably declining’, and in Ghana the species has disappeared from areas where it had previously been found (Dowsett-Lemaire and Dowsett 2014). In fact, in Ghana it may be confined only to large wildlife reserves (F. Dowsett-Lemaire in litt. 2016). In Togo it may have disappeared from most faunal reserves as a result of illegal habitat clearance, and may only persist in Fazao-Malfakassa National Park although this site is now also under threat (F. Dowsett-Lemaire in litt. 2016). Forest reserves in Benin are also being invaded by farmers, and this could threaten populations of the species in this country too (F. Dowsett-Lemaire in litt. 2016). It is not only threatened by habitat conversion as in certain areas hunters may kill individuals and use their stuffed heads as disguises while stalking game, although it is treated as a totem species in some areas and so may be relatively protected in such places as a result of this (Kemp 1995, Kemp and Boesman 2017).

To qualify as Vulnerable a species must undergo, or be thought to undergo in the future, a decline of 30-49% over 3 generations. The generation length for this species is c.30 years so the period of time to look at is 90 years, which would encompass the suspected declines in places such as Ghana (see Dowsett-Lemaire and Dowsett 2014). As with its close relative the Southern Ground-hornbill, Bucorvus leadbeateri, (see BirdLife International 2017) it is difficult to accurately assess rates of population change – particularly projecting into the future – because the species is so long lived. To try to more accurately assess whether this species may warrant uplisting to a threatened category we request any further information particularly regarding rates of decline, and the status of this species elsewhere within its range.

 

References

BirdLife International (2017) Species factsheet: Bucorvus leadbeateri. Downloaded from http://www.birdlife.org on 06/01/2017.

Borrow, N.; Demey, R. 2014. Birds of Western Africa: Second Edition. Christopher Helm, London.

Dowsett-Lemaire, F.; Dowsett, R. J. 2014. The Birds of Ghana: An atlas and handbook. Tauraco Press, Liège, Belgium.

Kemp, A. (1995) The hornbills. Oxford: Oxford University Press (Bird Families of the World).

Kemp, A.C. & Boesman, P. (2017). Northern Ground-hornbill (Bucorvus abyssinicus). 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. (retrieved from http://www.hbw.com/node/55880 on 6 January 2017).

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6 Responses to Archived 2018 topic: Northern Ground-hornbill (Bucorvus abyssinicus): request for information.

  1. Roger Q Skeen says:

    In Uganda, a country I have lived for five years and travelled wildly I would agree that B abyssinicus is almost always recorded only from National Parks and reserves. I cannot actually recall seeing a juvenile. It is most commonly seen in MFNP and KVNP primarily because it is a big terrestrial bird but I would not consider it common.

  2. In southern Chad in January 2017, a joint survey with African Parks and Under DCFAP of the Bahr Aouk & Salamat area showed that Bucorvus abyssinicus seems still widespread over a very large area of bush between Am Timan and Sarh.
    Densities of family parties seemed perhaps low (to what extent?) but did not appear significantly lower outside than inside Zakouma NP.

  3. Philip Hall says:

    B.abyssinicus is now only found in a few protected areas in Nigeria and only in very small numbers. There has been a significant overall decline in the population as formally it was to be found all over the north of the country. In Nigeria, it would definitely have to be classified as threatened.

  4. Andy Symes (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.

    There is now a period for further comments until the final deadline of 4 August, after which the recommended categorisations will be put forward to IUCN.

    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.

  5. James Westrip (BirdLife) says:

    Preliminary proposals

    Based on available information, our preliminary proposal for the 2018 Red List would be to list Northern Ground-hornbill as Vulnerable under criteria A2bcd+3bcd+4bcd.

    There is now a period for further comments until the final deadline in mid-July, after which the recommended categorisations will be put forward to IUCN.

    Please note that we will then only post final recommended categorisations on forum discussions where these differ from the initial proposal.
    The final 2018 Red List categories will be published on the BirdLife and IUCN websites in November, following further checking of information relevant to the assessments by both BirdLife and IUCN.

  6. Clive R Barlow says:

    Gambia – now a very rare event in coastal districts – there is now a vast Chinese conference centre on what was one of its breeding locos & haunts … the gen public people here seem to think they just go elsewhere – considerable folk lore assoc with it with the mega start Youssou N’dour making famous le Mansa Dibbon – its local name … there are some inland but no big groups reported for many years …

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