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Congo Grey Parrot Psittacus erithacus densities in oil palm plantation, agroforestry mosaic and protected forest in Southwest Cameroon

  • SASCHA DUEKER (a1), DENIS KUPSCH (a1), SERGE KADIRI BOBO (a2), ECKHARD W. HEYMANN (a3) and MATTHIAS WALTERT (a1)...
  • Please note a correction has been issued for this article.

Summary

The Congo Grey Parrot Psittacus erithacus has experienced a severe population breakdown in recent decades. The rainforests of the Korup region in Southwest Cameroon may harbour a large population of this species, but density and population estimates from this area remain controversial. Before the 2016 breeding season, we surveyed Grey Parrots along transects (621.1 km survey effort) in three adjacent landscape types: primary forest in Korup National Park (KNP), smallholder agroforestry matrix (AFM), and industrial oil palm plantation (OPP). We also collected information on the trees used for nesting, feeding and roosting. Using Distance analysis, we estimated relatively low densities of stationary flocks, ranging from 0.30 ind./km2 in KNP, over 0.82 ind./km2 in OPP to 2.70 ind./km2 in the AFM. Parrots were observed feeding or roosting in 17 tree species, of which 15 were located in AFM alone. Feeding was most often observed on cultivated Elaeis guineensis and Dacryodes edulis, but never in maize. The detected parrot densities probably reflect declines within the period 2008–2016, suggesting that the species’ recent IUCN uplisting to ‘Endangered’ and transfer to CITES Appendix I was indeed justified. Our results also suggest that traditional smallholder agroforestry may play a role in habitat conservation strategies, since these forms of cultivation may maintain important breeding and feeding opportunities for Congo Grey Parrots.

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Copyright

This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited.

Corresponding author

*Author for correspondence; e-mail: dkupsch@gwdg.de

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The online version of this article has been updated since original publication. A notice detailing the changes has also been published at https://doi.org/10.1017/S0959270919000297.

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References

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Amuno, J. B., Massa, R. and Dranzoa, C. (2007) Abundance, movements and habitat use by African Grey Parrots (Psittacus erithacus) in Budongo and Mabira forest reserves, Uganda. Ostrich 78: 225231.
Annorbah, N. N. D., Collar, N. J. and Marsden, S. J. (2016) Trade and habitat change virtually eliminate the Grey Parrot Psittacus erithacus from Ghana. Ibis 158: 8291.
Astaras, C., Linder, J. M., Wrege, P., Orume, R. D. and Macdonald, D. W. (2017) Passive acoustic monitoring as a law enforcement tool for afro-tropical rainforests. Front. Ecol. Environ. 15: 233234.
BirdLife International (2017a) Species factsheet: Psittacus erithacus. http://www.birdlife.org. on 04 September 2017.
BirdLife International (2017b) Species factsheet: Psittacus timneh. http://www.birdlife.org. Assessed on 04 September 2017.
Bobo, K. S., Waltert, M., Fichtler, M. and Mühlenberg, M. (2005) New bird records for the Korup project area, Southwest Cameroon. Malimbus 27: 1318.
Buckland, S. T., Anderson, D. R., Burnham, K. P., Laake, J. L., Borchers, D. L. and Thomas, L. (2001) Introduction to distance sampling: estimating abundance of biological populations. Oxford, UK: Oxford University Press.
Chupezi, T. J., Ndoye, O. and Mpele, T. O. (2006) Commodity-Chain Analysis for the capture and trade in the African grey parrots (Psittacus erithacus erithacus) in Cameroon. Yaoundé, Cameoron: Center for International Forestry Research (CIFOR).
Chuyong, G. B., Condit, R., Kenfack, D., Losos, E. C., Moses, S. N., Songwe, N. C. and Thomas, D. W. (2004) Korup forest dynamics plot, Cameroon. Pp. 506516 in Losos, E. C., and Leigh, E. G. Jr, eds. Tropical forest diversity and dynamism. Chicago, Illinois: University of Chicago Press.
CITES (2016) Section 6.2. Consideration Proposals for Amendment of Appendices I and II. Transfer from Appendix II to Appendix I of Psittacus erithacus in accordance with Resolution Conf. 9.24. https://cites.org/. Accessed on 4 September 2017.
Clemmons, J. R. (2003) Status survey of the African Grey Parrot (Psittacus erithacus timneh) and development of a management program in Guinea and Guinea-Bissau. Geneva, Switzerland: Unpublished report to the CITES Secretariat.
Collar, N. J. (2013) Timneh parrot and Grey Parrot represent two species. http://stuartmarsden.blogspot.co.uk/2013/12/timneh-parrot-and-grey-parrot-represent.html. Accessed on 4 September 2017.
Dranzoa, C. (1995) Bird populations of primary and logged forests in Kibale Forest National Park, Uganda. Ph.D. dissertation, Makerere University, Uganda.
Eniang, E. E., Akpan, C. E. and Eniang, M. E. (2008) A survey of African Grey parrots (Psittacus erithacus) trade and trafficking in Ekonganaku area of Ikpan forest block, Nigeria. Ethiopian J. Environ. Stud. Manage. 1: 6873.
Fa, J. E., Seymour, S., Dupain, J., Amin, R., Albrechtsen, L. and Macdonald, D. (2006) Getting to grips with the magnitude of exploitation: bushmeat in the Cross-Sanaga rivers region, Nigeria and Cameroon. Biol. Conserv. 129: 497510.
Fotso, R. (1998a) Survey status of the distribution and utilization of the Grey Parrot (Psittacus erithacus) in Cameroon. Geneva, Switzerland: CITES.
Fotso, R. (1998b) Etude sur l’état, la répartition géographique et l’utilisation du perroquet gris (Psittacus erithacus) dans la République démocratique du Congo. Geneva, Switzerland: CITES.
Gartlan, J. S., Newbery, D. M., Thomas, D. W. and Waterman, P. G. (1986) The influence of topography and soil phosphorus on the vegetation of Korup Forest Reserve, Cameroun. Vegetatio 65: 131148.
Gnam, R. S. (1991) Nesting behaviour of the Bahama Parrot (Amazona leucocephala bahamensis) on Abaco Island, Bahamas. Proc. Internatn. Ornithol. Congress 20: 673680.
Green, A. A., Hall, P. and Leventis, A. P. (2007) Avifauna of Omo Forest Reserve, SW Nigeria. Malimbus 29: 1630.
Kupsch, D., Vendras, E., Ocampo-Ariza, C., Batáry, P., Motombi, F. N., Bobo, K. S. and Waltert, M. (2019) High critical forest habitat thresholds of native bird communities in Afrotropical agroforestry landscapes. Biol. Conserv. 230: 2028.
Lee, A. T. and Marsden, S. J. (2012) The influence of habitat, season, and detectability on abundance estimates across an Amazonian parrot assemblage. Biotropica 44: 537544.
Legault, A., Theuerkauf, J., Baby, E., Moutin, L., Rouys, S., Saoumoé, M., Verfaille, L., Barré, N., Chartendrault, V. and Gula, R. (2013) Standardising distance sampling surveys of parrots in New Caledonia. J. Ornithol. 154: 1933.
Linder, J. M. and Oates, J. F. (2011) Differential impact of bushmeat hunting on monkey species and implications for primate conservation in Korup National Park, Cameroon. Biol. Conserv. 144: 738745.
Linder, J. M. and Palkovitz, R. E. (2016) The threat of industrial oil palm expansion to primates and their habitats. Pp. 2145 in Waller, M. T., ed. Ethnoprimatology: Primate Conservation in the 21st Century. Berlin, Germany: Springer.
Marsden, S. J., Pilgrim, J. D. and Wilkinson, R. (2001) Status, abundance and habitat use of blue-eyed cockatoo Cacatua ophthalmica on New Britain, Papua New Guinea. Bird Conserv. Internatn. 11: 151160.
Marsden, S. J., Loqueh, E., Takuo, J. M., Hart, J. A., Abani, R., Ahon, D. B., Annorbah, N. N. D., Johnson, R. and Valle, S. (2015) Using encounter rates as surrogates for density estimates makes monitoring of heavily-traded grey parrots achievable across Africa. Oryx 50: 617625.
Martin, R. O., Perrin, M. R., Boyes, R. S., Abebe, Y. D., Annorbah, N. N. D. et al. (2014a) Research and conservation of the larger parrots of Africa and Madagascar: a review of knowledge gaps and opportunities. Ostrich 85: 205233.
Martin, R. O., Gilardi, J., Johnson, R., Ndang’ang’a, P. K., Fotso, R., Drori, O. and Perrin, M. (2014b) Grey parrot Psittacus harvesting for conservation must have a robust scientific basis: Commentary on Tamungang et al . (2013). Internatn. J. Biodivers. Conserv. 6: 750753.
Martin, R. O. (2018a) The wild bird trade and African parrots: past, present and future challenges. Ostrich 89: 139143.
Martin, R. O. (2018b) Grey areas: temporal and geographical dynamics of international trade of Grey and Timneh Parrots (Psittacus erithacus and P. timneh) under CITES. Emu 118: 113125.
McGowan, P. (2001) Status, management and conservation of the African Grey Parrot Psittacus erithacus in Nigeria. Geneva, Switzerland: Unpublished report to CITES.
MINFOF (2017) The Management Plan for Korup National Park and its peripheral zone 2017-2021. Buea, Cameroon: Regional Delegation of the Ministry of Forestry and Wildlife.
Mittermeier, R. A., Robles-Gil, P., Hoffmann, M., Pilgrim, J. D., Brooks, T. B., Mittermeier, C. G., Lamoreux, J. L. and Fonseca, G. A. B. (2004) Hotspots revisited: Earth’s biologically richest and most endangered ecoregions. Mexico City, Mexico: CEMEX.
Naurois, R. de (1981) La distribution géographique du perroquet gris Psittacus erythacus timneh. Malimbus 3: 5961.
Perrin, M. (2012) Parrots of Africa, Madagascar and the Mascarene Islands: biology, ecology and conservation. Johannesburg, South Africa: Wits University Press.
Pinho, J. B. and Nogueira, F. M. B. (2003) Hyacinth Macaw (Anodorhynchus hyacinthinus) reproduction in the Northern Pantanal, Mato Grosso, Brazil. Ornitol. Neotrop. 14: 2938.
Reuleaux, A., Richards, H., Payet, T., Villard, P., Waltert, M. and Bunbury, N. (2014a) Breeding ecology of the Seychelles black parrot Coracopsis barklyi. Ostrich 85: 255265.
Reuleaux, A., Richards, H., Payet, T., Villard, P., Waltert, M. and Bunbury, N. (2014b) Insights into the feeding ecology of the Seychelles Black Parrot Coracopsis barklyi using two monitoring approaches. Ostrich 85: 245253.
Sedgwick, J. A. (1997) Sequential cavity use in a cottonwood bottomland. Condor 99: 880887.
Tamungang, S. A. and Cheke, R. A. (2012) Population status and management plan of the African Grey Parrot (SC62 Inf. 14). Report prepared by the Ministry of Forestry and Wildlife, Cameroon. Geneva, Switzerland: CITES Secretariat.
Tamungang, S. A., Cheke, R. A., Kougoum, G. P. and Ntiri, E. S. (2013) Linking population size to conservation needs of the Grey Parrot in Cameroon. Internatn. J. Biodivers. Conserv. 5: 478485.
Tamungang, S. A., Onabid, M. A., Awa, T. and Balinga, V. S. (2016) Habitat preferences of the Grey Parrot in heterogeneous vegetation landscapes and their conservation implications. Internatn. J. Biodiversity 2016: Article ID: 7287563.
Thomas, D. W. (1996) Botanical survey of the Rumpi Hills and Nta Ali. Report to the GTZ, Germany, and to the Korup Project, Mundemba, Cameroon.
Thomas, L., Buckland, S. T., Rexstad, E. A., Laake, J. L., Strindberg, S., Hedley, S. L., Bishop, J. R. B., Marques, T. A. and Burnham, K. P. (2010) Distance software: design and analysis of distance sampling surveys for estimating population size. J. Appl. Ecol. 47: 514.
Valle, S., Collar, N. J., Harris, W. E. and Marsden, S. J. (2017) Spatial and seasonal variation in abundance within an insular grey parrot population. Afr. J. Ecol. 55: 433442.
Walsh, P. D. and White, L. J. (1999) What it will take to monitor forest elephant populations. Conserv. Biol. 13: 11941202.
Waltert, M., Lien, , Faber, K. and Mühlenberg, M. (2002) Further declines of threatened primates in the Korup Project Area, south-west Cameroon. Oryx 36: 257265.
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