1 Lancaster Environment Centre, Lancaster University, Lancaster, UK. 2 Department of Surveying and Geoinformatics, Nnamdi Azikiwe University, Awka, Nigeria. 3 Wildlife Conservation Society, Calabar, Nigeria. 4 Centre for Landscape and Climate Research, University of Leicester, Leicester, UK.
This paper investigates the impacts of forest cover and spatial structure changes on the forest landscape across Afi-Mbe-Okwangwo protected area of Cross River State, Nigeria and its corresponding implication on two endangered primates (Cross River Gorilla and Nigeria-Cameroon Chimpanzee) habitat using satellite remote sensing and modeling techniques. Using remote sensing change detection analysis, the spatial extent and annual rate of deforestation for the study area was determined as 34,620 hectares and 1.5% respectively (from 2000 to 2014). The protected areas with highest annual deforestation rates were Afi Mountain Wildlife Sanctuary (2.6%) and Mbe Mountains (2.2%), both prominent for gorilla and chimpanzee sightings and nests. Further investigations on changes to the forest landscape structure revealed high levels of forest fragmentation across the study area for the 14-year period investigated. As a means of further understanding effects of forest landscapes changes across the study area, a 14-year forward simulation was performed using the Markov model as to determine the spatial extent of futuristic forest cover changes. The results showed that if this current trend of forest cover change continued, 28,121 hectares of forests would be lost to deforestation in 2028 (approximately 16% of the total landmass of the entire study area). Using Maxent modeling, suitable primate habitats were predicted and the total coverage determined as 30,940 hectares (54.4% situated in CRNP—Okwangwo division, 29.4% in AMWS, 14.3% in Mbe Mountains and 1.9% in ARFR). Further analysis revealed 6468 hectares of predicted primate habitat were affected by deforestation in 2014 (21% of the predicted primate habitats). These results indicate that suitable primate habitats (particularly for gorillas and chimpanzees) are under immense pressure from deforestation and forest fragmentation. This paper presents a cost effective and time saving approach for determining suitable primate habitats and understanding the effects of forest transition on primate habitat suitability.
Onojeghuo, A. , Blackburn, A. , Okeke, F. and Onojeghuo, A. (2015) Habitat Suitability Modeling of Endangered Primates in Nigeria: Integrating Satellite Remote Sensing and Spatial Modeling Techniques. Journal of Geoscience and Environment Protection, 3, 23-38. doi: 10.4236/gep.2015.38003.
[1] Al-Quraishi, A.M.F., Guang, D.H. and Jian, G.C. (2004) Land Degradation Detection, Mapping, and Monitoring in the Northwestern Part of Hebei Province, China, Using RS and GIS Technologies. Map Asia Conference 2004, Beijing, 26-29 August 2004.
[2] Angelsen, A. and Kaimowitz, D. (1999) Rethinking the Causes of Deforestation: Lessons from Economic Models. The World Bank Research Observer, 14, 73-98.
http://dx.doi.org/10.1093/wbro/14.1.73
[3] Baldwin, R.A. (2009) Use of Maximum Entropy Modeling in Wildlife Research. Entropy, 11, 854-66.
http://dx.doi.org/10.3390/e11040854
[4] Bergl, R.A., Brenda, J.B, Nsubuga, A. and Vigilant, L. (2008) Effects of Habitat Fragmentation, Population Size and Demographic History on Genetic Diversity: The Cross River Gorilla in a Comparative Context. American Journal of Primatology, 70, 848-59.
http://dx.doi.org/10.1002/ajp.20559
[5] Bergl, R.A., Ymke, W., Aaron, N., Dunn, A., Inaoyom, I., Jacqueline, L. Sunderland-Groves and Oates, J.F. (2012) Remote Sensing Analysis Reveals Habitat, Dispersal Corridors and Expanded Distribution for the Critically Endangered Cross River Gorilla Gorilla gorilla diehli. Oryx, 46, 278-89.
http://dx.doi.org/10.1017/S0030605310001857
[6] Boyd, D.S., Foody, G.M. and Ripple, W.J. (2002) Evaluation of Approaches for Forest Cover Estimation in the Pacific Northwest, USA, Using Remote Sensing. Applied Geography, 22, 375-92.
http://dx.doi.org/10.1016/S0143-6228(02)00048-6
[7] Chander, G., Markham, B.L. and Helder, D.L (2009) Summary of Current Radiometric Calibration Coefficients for Landsat MSS, TM, ETM+, and EO-1 ALI Sensors. Remote sensing of Environment, 113, 893-903.
http://dx.doi.org/10.1016/j.rse.2009.01.007
[8] Cowlishaw, G. and Dunbar, R.I.M (2000) Primate Conservation Biology. University of Chicago Press, Chicago.
[9] Elith, J., Graham, C.H., Anderson, R.P., Dudík, M., Ferrier, S., Guisan, A., Hijmans, R.J., Huettmann, F., Leathwick, J.R., Lehmann, A., Li, J., Lohmann, L.G., Loiselle, B.A., Manion, G., Moritz, C., Nakamura, M., Nakazawa, Y., Mc Overton, J., Peterson, A.T. and Phillips, S.J. (2006) Novel Methods Improve Prediction of Species’ Distributions from Occurrence Data. Ecography, 29, 129-51.
http://dx.doi.org/10.1111/j.2006.0906-7590.04596.x
[10] ESRI (2014) ArcGIS Desktop: Release 10.2. Environmental Systems Research Institute.
http://www.esri.com/
[11] FAO (2010) Global Forest Resources Assessment 2010. Food and Agriculture Organization of the United Nations, Rome.
[12] Geist, H.J. and Lambin, E.F. (2001) What Drives Tropical Deforestation. LUCC Report Series No. 4, 116 p.
[13] Harcourt, A.H., Stewart, K.J. and Inahoro, I.M. (1989) Gorilla Quest in Nigeria. Oryx, 23, 7-13.
http://dx.doi.org/10.1017/S0030605300022535
[14] Harcourt, A.H. (1996) Is the Gorilla a Threatened Species? How Should We Judge? Biological Conservation, 75, 165-176.
http://dx.doi.org/10.1016/0006-3207(95)00059-3
[15] Harcourt, A.H. and Doherty, D.A. (2005) Species-Area Relationships of Primates in Tropical Forest Fragments: A Global Analysis. Journal of Applied Ecology, 42, 630-637.
http://dx.doi.org/10.1111/j.1365-2664.2005.01037.x
[16] Huang, C., Wylie, B., Yang, L., Homer, C. and Zylstra, G. (2002) Derivation of a Tasselled Cap Transformation Based on Landsat 7 At-Satellite Reflectance. International Journal of Remote Sensing, 23, 1741-1748.
http://dx.doi.org/10.1080/01431160110106113
[17] Imong, I., Eban, J. and Mengnjo, C. (2014) Using Technology to Save Gorillas in the Mbe Mountains. Gorilla Journal, 48, 15-17.
[18] Iqbal, M. (2012) An Introduction to Solar Radiation. Elsevier, Amsterdam.
[19] Irish, R.R. (2000) Landsat 7 Science Data User’s Handbook. National Aeronautics and Space Administration, Report 430-15-01-003-0.
[20] Ite, U.E. and Adams, W.M. (1998) Forest Conversion, Conservation and Forestry in Cross River State, Nigeria. Applied Geography, 18, 301-314.
http://dx.doi.org/10.1016/S0143-6228(98)00023-X
[21] Kehinde, A.L., Akande, J.A. and Ntabe, E. (2009) Forest Stakeholder’s Awareness of Reduced Impact Logging (RIL) in Nigeria and Cameroon. Journal of Horticulture and Forestry, 1, 176-181.
[22] Lu, D., Mausel, P., Brondizio, E. and Moran, E. (2002) Assessment of Atmospheric Correction Methods for Landsat TM Data Applicable to Amazon Basin LBA Research. International Journal of Remote Sensing, 23, 2651-2671.
http://dx.doi.org/10.1080/01431160110109642
[23] Mambo, J. and Archer, E. (2007) An Assessment of Land Degradation in the Save Catchment of Zimbabwe. Area, 39, 380-391.
http://dx.doi.org/10.1111/j.1475-4762.2007.00728.x
[24] McGarigal, K., Cushman, S.A., Neel, M.C. and Ene, E. (2002) FRAGSTATS: Spatial Pattern Analysis Program for Categorical Maps.
[25] Mengnjo, C. (2015) Wildlife Conservation Society Annual Report 2014—Cross River National Park (Okwangwo Divison). Wildlife Conservation Society.
www.wcsnigeria.org
[26] Midha, N. and Mathur, P.K. (2010) Assessment of Forest Fragmentation in the Conservation Priority Dudhwa Landscape, India Using FRAGSTATS Computed Class Level Metrics. Journal of the Indian Society of Remote Sensing, 38, 487-500.
http://dx.doi.org/10.1007/s12524-010-0034-6
[27] Mondal, P. and Southworth, J. (2010) Evaluation of Conservation Interventions Using a Cellular Automata-Markov Model. Forest Ecology and Management, 260, 1716-1725.
http://dx.doi.org/10.1016/j.foreco.2010.08.017
[28] Morgan, B.J., Adeleke, A., Bassey, T., Bergl, R., Dunn, A., Fotso, R., Gadsby, E., Gonder, K., Greengrass, E., Koulagna, D.K., Mbah, G., Nicholas, A., Oates, J., Omeni, F., Saidu, Y., Sommer, V., Sunderland-Groves, J., Tiebou, J. and Williamson, E. (2011) Regional Action Plan for the Conservation of the Nigeria-Cameroon Chimpanzee (Pan troglodytes ellioti). IUCN/SSC Primate Specialist Group and Zoological Society of San Diego.
[29] Myers, N., Mittermeier, R.A., Mittermeier, C.G., Da Fonseca, G.A.B. and Kent, J. (2000) Biodiversity Hotspots for Conservation Priorities. Nature, 403, 853-858.
http://dx.doi.org/10.1038/35002501
[30] Oates, J.F., Bergl, R.A. and Linder, J.M. (2004) Africa’s Gulf of Guinea Forests: Biodiversity Patterns and Conservation Priorities. Advances in Applied Biodiversity Science, Vol. 6, Conservation International, Washington DC.
[31] Oates, J.F., White, D., Gadsby, E.L. and Bisong, P.O. (1990) Conservation of Gorillas and Other Species. In: Caldecott, J.O., Oates, J.F. and Ruitenbeek, H.J., Eds., Cross River National Park (Okwangwo Division): Plan for Developing the Park and Its Support Zone, Appendix 1, WWF-UK, Goldalming.
[32] Oates, J.F., Sunderland-Groves, J., Bergl, R., Dunn, A., Nicholas, A., Takang, E., Omeni, F., Imong, I., Fotso, R. and Nkembi, L. (2007) Regional Action Plan for the Conservation of the Cross River Gorilla (Gorilla gorilla diehli). IUCN/SSC Primate Specialist Group and Conservation International, Washington DC.
[33] Oyebo, M., Bisong, F. and Morakinyo, T. (2015) A Preliminary Assessment of the Context for REDD in Nigeria.
http://www.gcftaskforce.org/meeting/documents/Nigeria_National_Update_GCF_2011.pdf
[34] Phillips, S.J., Anderson, R.P. and Schapire, R.E. (2006) Maximum Entropy Modeling of Species Geographic Distributions. Ecological Modelling, 190, 231-259.
http://dx.doi.org/10.1016/j.ecolmodel.2005.03.026
[35] Phillips, S.J., Dudík, M. and Schapire, R.E. (2004) A Maximum Entropy Approach to Species Distribution Modeling. Proceedings of the 21st International Conference on Machine Learning, Banff, 4-8 July 2004, 83.
http://dx.doi.org/10.1145/1015330.1015412
[36] Plumptre, A.J., McNeilage, A., Hall, J.S. and Williamson, E.A. (2002) The Current Status of Gorillas and Threats to Their Existence at the Beginning of a New Millennium. In: Taylor, A.B. and Goldsmith, M.L., Eds., Gorilla Biology: A Multidisciplinary Perspective, Cambridge University Press, Cambridge, 414-431.
http://dx.doi.org/10.1017/cbo9780511542558.019
[37] Radespiel, U. and Bruford, M.W. (2014) Fragmentation Genetics of Rainforest Animals: Insights from Recent Studies. Conservation Genetics, 15, 245-260.
http://dx.doi.org/10.1007/s10592-013-0550-3
[38] Ravilious, C., Kapos, V., Osti, M., Bertzky, M., Bayliss, J.L., Dahiru, S. and Dickson, B. (2010) Carbon, Biodiversity and Ecosystem Services: Exploring Co-Benefits. Nigeria: Preliminary Results. UNEP-WCMC, Cambridge, UK.
[39] Saatchi, S., Buermann, W., ter Steege, H., Mori, S. and Smith, T.B. (2008) Modeling Distribution of Amazonian Tree Species and Diversity Using Remote Sensing Measurements. Remote Sensing of Environment, 112, 2000-2017.
http://dx.doi.org/10.1016/j.rse.2008.01.008
[40] Schoneveld, G.C. (2014) The Politics of the Forest Frontier: Negotiating between Conservation, Development, and Indigenous Rights in Cross River State, Nigeria. Land Use Policy, 38, 147-162.
http://dx.doi.org/10.1016/j.landusepol.2013.11.003
[41] Shoch, D., Eaton, J. and Settelmyer, S. (2011) Project Developer’s Guidebook to VCS REDD Methodologies. Conservation International, Arlington.
[42] Smith, P., Bustamante, M., Ahammad, H., Clark, H., Dong, H., Elsiddig, E.A., Haberl, H., Harper, R., House, J., Jafari, M., Masera, O., Mbow, C., Ravindranath, N.H., Rice, C.W., Robledo Abad, C., Romanovskaya, A., Sperling, F. and Tubiello, F. (2014) Agriculture, Forestry and Other Land Use (AFOLU). In: Edenhofer, O., Pichs-Madruga, R., Sokona, Y., Farahani, E., Kadner, S., Seyboth, K., Adler, A., et al., Eds., Climate Change 2014: Mitigation of Climate Change. Contribution of Working Group III to the Fifth Assessment Report of the Intergovernmental Panel on Climate Change, Cambridge University Press, Cambridge, United Kingdom and New York, 811-922.
[43] Fielding, A.H. and Bell, J.F. (1997) A Review of Methods for the Assessment of Prediction Errors in Conservation Presence/Absence Models. Environmental Conservation, 24, 38-49.
http://dx.doi.org/10.1017/S0376892997000088
[44] Souza, C., Firestone, L., Silva, L.M. and Roberts, D. (2003) Mapping Forest Degradation in the Eastern Amazon from SPOT 4 through Spectral Mixture Models. Remote Sensing of Environment, 87, 494-506.
http://dx.doi.org/10.1016/j.rse.2002.08.002
[45] CRS (2014) Cross River State of Nigeria Gazette. C.R.M. Court, Ed., No. 1, Ministry of Information, Calabar.
[46] Suter, J. and Oates, J. (2000) Sanctuary in Nigeria for Possible Fourth Subspecies of Gorilla. Oryx, 34, 71-71.
http://dx.doi.org/10.1017/S0030605300030921
[47] Takada, T., Miyamoto, A. and Hasegawa, S.F. (2010) Derivation of a Yearly Transition Probability Matrix for Land-Use Dynamics and Its Applications. Landscape Ecology, 25, 561-572.
http://dx.doi.org/10.1007/s10980-009-9433-x
[48] Ezebilo, E.E. and Mattsson, L. (2010) Socio-Economic Benefits of Protected Areas as Perceived by Local People around Cross River National Park, Nigeria. Forest Policy and Economics, 12, 189-193.
http://dx.doi.org/10.1016/j.forpol.2009.09.019