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Lower Guinean forests

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The Lower Guinean forests also known as the Lower Guinean-Congolian forests, are a region of coastal tropical moist broadleaf forest in West Africa, extending along the eastern coast of the Gulf of Guinea from eastern Benin through Nigeria and Cameroon.[1] The Guinean forests encompass a diverse array of vegetation zones that range from humid coastal forests, freshwater swamp forests (such as those found around the Niger Delta), to arid, semi-deciduous forests further inland, characterized by extended periods of dry weather.[2]

The Guinean Forests Hotspot boasts a plethora of ecological characteristics that make it globally exceptional.[3] Notably, the Niger Delta swamp forests rank as the second-largest swamp forest on the African continent, while the Central African Mangroves represent the largest mangrove expanse in Africa. [3] Moreover, the offshore volcanic islands within the hotspot are remarkable for their substantial levels of unique species, particularly considering their size.[3] Additionally, the hotspot contains the Volta River, one of West Africa's largest rivers, and the delta of the Niger River, the longest and most massive river in the region. Furthermore, the Western Equatorial Crater Lakes ecoregion is among those recognized as globally remarkable.[3]

The Dahomey Gap, a region of savanna and dry forest in Togo and Benin, divides the Lower Guinean forests from the Upper Guinean forests to the west, which extend along the western coast of the Gulf of Guinea from Togo to Liberia and north to Guinea. To the north and northeast, the Lower Guinean forests transition to the drier inland Guinean forest–savanna mosaic and Northern Congolian forest–savanna mosaic and to the southeast are bounded by the Congolian Coastal forests, whose boundary is the Sanaga River in Cameroon.[4] The Lower Guinean forests share many biotic affinities with the Upper Guinean forests. They are collectively known as the Guinean Forests of West Africa, location is Sierra Leone.[5]

The Lower Guinean forests, represent a vital ecological region in West and Central Africa. Stretching along the Gulf of Guinea coastline, these forests encompass parts of Nigeria, Cameroon, Equatorial Guinea, Gabon, Congo, the Democratic Republic of Congo (DRC), and smaller portions of neighboring countries.[6] The Lower Guinean forests are globally recognized as a biodiversity hotspot, characterized by their exceptional ecological significance and remarkable species diversity.[7]

Ecoregions

The World Wide Fund for Nature (WWF) divides the Lower Guinean forests into a number of distinct ecoregions:

The WWF has designated two regions of the Lower Guinean forests as Global 200 priority regions for conservation. The WWF's "Coastal Congolian forests" region includes the Cross-Sanaga Bioko coastal forests, São Tomé and Príncipe moist lowland forests, and Atlantic Equatorial coastal forests ecoregions. The "Cameroon Highlands forests" Global 200 region includes the Cameroonian Highlands forests and the Mount Cameroon and Bioko montane forests ecoregions.

Geographical Features

Tropical Rainforests

These forests primarily consist of tropical rainforests, characterized by high rainfall, lush vegetation, and a wide variety of plant life. The region's rainfall is relatively evenly distributed throughout the year.[1]

Flora and Fauna

The Guinean Forests Hotspot is renowned for its abundant and distinctive collection of wildlife. A noteworthy characteristic of the fauna within this region is that numerous endemic species have particularly limited distributions within the hotspot, rendering them highly susceptible to the consequences of deforestation.[2] To illustrate, the Upper Guinea Highlands harbor an exceptionally high concentration of endemic bats and amphibians with constrained habitats, all of which are classified as either Critically Endangered or Endangered.[2]

The Lower Guinean forests are recognized as one of the world's biodiversity hotspots. They are home to a vast array of plant and animal species, many of which are endemic.[8]

Lower Guinean forests are known for their rich botanical diversity, including numerous tree species, epiphytes, orchids, and medicinal plants. The forests support diverse wildlife, including various primates (such as chimpanzees and gorillas), big cats (like leopards and forest elephants), numerous bird species, reptiles, amphibians, and insects.[9][1]

Around 63 out of the approximately 320 mammal species are unique to this area, and there are also seven exclusive genera, among them is the single-species genus like the Liberian mongoose (Libtnezctis kuhn~, EN).[2] Another example of a one-species genus is the pygmy hippo (Hexaprotodon liberiensis, VU), a charming miniature version of its larger relative, which is found solely in the Guinean forests, with one subspecies residing in Upper Guinea and another in the Niger Delta.[2]

Ecological Significance

Carbon Storage

These forests play a critical role in sequestering carbon dioxide, helping to mitigate climate change. Their extensive vegetation stores significant amounts of carbon.[10][11] One of the most pressing global environmental concerns is climate change, primarily driven by the accumulation of greenhouse gases, including carbon dioxide, in the atmosphere.[12] The Lower Guinean Forests emerged as a key player in mitigating this phenomenon. These forests boast a remarkable capacity for carbon storage. The extensive and diverse vegetation that thrives within this biome serves as a substantial carbon sink, effectively sequestering carbon dioxide from the atmosphere.[13]

In fact, numerous studies and scientific reports have emphasized the importance of these forests in the fight against climate change.[14] Research findings underscore that the Lower Guinean Forests store significant amounts of carbon, serving as a vital buffer against the rising levels of atmospheric CO2.[15] This sequestration function underscores the invaluable role played by these forests in supporting global efforts to reduce the impacts of climate change.

Water Regulation

The forests regulate water flow, helping to prevent flooding during heavy rains and ensuring a steady supply of freshwater to rivers and streams.[16][17]

Habitat for Endangered Species

Several critically endangered species, including the Cross River gorilla and various species of monkeys and birds, inhabit the Lower Guinean forests.[18][19]

Cultural and Indigenous Importance

These forests are often home to indigenous communities with rich cultural traditions. The forests provide resources and are central to the way of life of many local peoples.[20]

Threats and Conservation

The Guinean Forests Hotspot faces severe threats, being among the world's most endangered forest systems, marked by extensive habitat fragmentation and degradation across the majority of the area.[2]

Deforestation

The Lower Guinean forests are under threat from deforestation due to logging, agriculture, mining, and infrastructure development. This threatens both biodiversity and carbon storage.[1][21]

Habitat Fragmentation

The expansion of human activities has led to the fragmentation of forest habitats, making it more challenging for wildlife to thrive and migrate.[22]

Illegal Wildlife Trade

Poaching and the illegal trade in wildlife, especially for bushmeat and exotic pets, put pressure on many species within the forests.[21][23]

Climate Change

Changing rainfall patterns and temperature variations associated with climate change can impact the health and distribution of forest ecosystems.[24]

Conservation Efforts

Efforts are being made by conservation organizations, governments, and local communities to protect and conserve the Lower Guinean forests. Strategies include creating protected areas, promoting sustainable forestry practices, and raising awareness about the ecological and cultural value of these unique forests. Conservation initiatives aim to balance the need for economic development with the imperative to preserve this vital ecological region.[25]

See also

References

  1. ^ a b c d Darwall, W., Polidoro, B., Smith, K., & Somda, J. (2015). Ecosystem profile guinean forests of West Africa biodiversity hotspot. Critical Ecosystem Partnership Fund Report.
  2. ^ a b c d e f Bakarr, M; Oates, J.F; Fahr, J; Parren, M; Röde, M.O; Demey, R (2004). Guinean forests of West Africa. Washington, D.C: CEMEX & Conservation International. pp. 123–130.
  3. ^ a b c d Carr, Jamie; Adewale Adeleke; Angu, Kenneth Angu; Belle, Elise; Burgess, Neil; Savrina Carrizo; Choimes, Argyris; Nonie Coulthard; Darwall, William; Foden, Wendy; Jean-Marc Garreau; Wenceslas Gatarabirwa; Hicks, Charlotte; Kapijimpanga, Daniel Ramlose; King, Emily (2015). "Ecosystem Profile Guinean Forests of West Africa Biodiversity Hotspot". Critical Ecosystem partnership. doi:10.13140/RG.2.1.1724.8889.
  4. ^ Linder, H. Peter, Helen M. de Klerk Julia Born et al. (2012). "The partitioning of Africa: statistically defined biogeographical regions in sub‐Saharan Africa". Journal of Biogeography Volume 39, Issue 7 May 2012. [1]
  5. ^ "Guinean Forests of West Africa", Wikipedia, 2023-03-29, retrieved 2023-07-01
  6. ^ "Guinean Forests of West Africa - Biodiversity Hotspots LCS ESS". sites.google.com. Retrieved 2023-10-09.
  7. ^ Streck, Charlotte; Scholz, Sebastian M. (2006). "The Role of Forests in Global Climate Change: Whence We Come and Where We Go". International Affairs (Royal Institute of International Affairs 1944-). 82 (5): 861–879. ISSN 0020-5850.
  8. ^ Carr, Jamie; Adewale Adeleke; Angu, Kenneth Angu; Belle, Elise; Burgess, Neil; Savrina Carrizo; Choimes, Argyris; Nonie Coulthard; Darwall, William; Foden, Wendy; Jean-Marc Garreau; Wenceslas Gatarabirwa; Hicks, Charlotte; Kapijimpanga, Daniel Ramlose; King, Emily (2015). "Ecosystem Profile Guinean Forests of West Africa Biodiversity Hotspot". doi:10.13140/RG.2.1.1724.8889. {{cite journal}}: Cite journal requires |journal= (help)
  9. ^ "Guinean Forests of West Africa - Species | CEPF". www.cepf.net. Retrieved 2023-10-09.
  10. ^ Nunes, Leonel J. R.; Meireles, Catarina I. R.; Pinto Gomes, Carlos J.; Almeida Ribeiro, Nuno M. C. (February 2020). "Forest Contribution to Climate Change Mitigation: Management Oriented to Carbon Capture and Storage". Climate. 8 (2): 21. doi:10.3390/cli8020021. ISSN 2225-1154.{{cite journal}}: CS1 maint: unflagged free DOI (link)
  11. ^ Dixon, R. K., Winjum, J. K., & Schroeder, P. E. (1993). Conservation and sequestration of carbon: the potential of forest and agroforest management practices. Global Environmental Change, 3(2), 159-173.
  12. ^ Hanaki, Keisuke; Portugal-Pereira, Joana (2018), Takeuchi, Kazuhiko; Shiroyama, Hideaki; Saito, Osamu; Matsuura, Masahiro (eds.), "The Effect of Biofuel Production on Greenhouse Gas Emission Reductions", Biofuels and Sustainability: Holistic Perspectives for Policy-making, Science for Sustainable Societies, Tokyo: Springer Japan, pp. 53–71, doi:10.1007/978-4-431-54895-9_6, ISBN 978-4-431-54895-9, retrieved 2023-10-20
  13. ^ Jain, P. C. (1993-06-01). "Greenhouse effect and climate change: scientific basis and overview". Renewable Energy. Solar radiation, environment and climate change. 3 (4): 403–420. doi:10.1016/0960-1481(93)90108-S. ISSN 0960-1481.
  14. ^ Bettinger, Pete (2011-03-25). "Carbon Sinks and Climate Change, Forests In The Fight Against Global Warming, by Colin A. G. Hunt: Cheltenham, UK: Edward Elgar Publishing Ltd., 2009, 236 pages, ISBN-13 978-1-84720-977-1". Journal of Sustainable Forestry. 30 (3): 261–262. doi:10.1080/10549811.2011.530937. ISSN 1054-9811.
  15. ^ Lindsell, Jeremy A.; Klop, Erik (2013-02-01). "Spatial and temporal variation of carbon stocks in a lowland tropical forest in West Africa". Forest Ecology and Management. 289: 10–17. doi:10.1016/j.foreco.2012.09.045. ISSN 0378-1127.
  16. ^ Blumenfeld, S., Lu, C., Christophersen, T., & Coates, D. (2009). Water, wetlands and forests. a review of ecological, economic and policy linkages. In Secretariat of the Convention on Biological Diversity and Secretariat of the Ramsar Convention on Wetlands, Montreal and Gland. CBD Technical Series (Vol. 47, pp. 1-38).
  17. ^ Nilsson, Christer; Renöfält, Birgitta Malm (2008). "Linking Flow Regime and Water Quality in Rivers: a Challenge to Adaptive Catchment Management". Ecology and Society. 13 (2). ISSN 1708-3087.
  18. ^ Oates, J. F., Bergl, R. A., & Linder, J. M. (2004). Africa's Gulf of Guinea forests: Biodiversity patterns and conservation priorities (p. 90). Washington, DC: Conservation International.
  19. ^ Mittermeier, R. A., Valladares-Pádua, C., Rylands, A. B., Eudey, A. A., Butynski, T. M., Ganzhorn, J. U., ... & Walker, S. (2006). Primates in peril: the world's 25 most endangered primates, 2004–2006. Primate Conservation, 2006(20), 1-28.
  20. ^ Fairhead, J., & Leach, M. (1996). Misreading the African landscape: society and ecology in a forest-savanna mosaic (No. 90). Cambridge University Press.
  21. ^ a b Babon, Andrea; Gowae, Gae Yansom (2013). Drivers of deforestation and forest degradation (Report). Center for International Forestry Research. pp. 1–11.
  22. ^ Voigt, Maria; Supriatna, Jatna; Deere, Nicolas J; Kastanya, Agustinus; Mitchell, Simon L; Rosa, Isabel M D; Santika, Truly; Siregar, Rondang; Tasirin, Johny S; Widyanto, Adi; Winarni, Nurul L; Zakaria, Zuliyanto; Mumbunan, Sonny; Davies, Zoe G; Struebig, Matthew J (2021-09-01). "Emerging threats from deforestation and forest fragmentation in the Wallacea centre of endemism". Environmental Research Letters. 16 (9): 094048. doi:10.1088/1748-9326/ac15cd. ISSN 1748-9326.
  23. ^ Mozer, Annika; Prost, Stefan (2023-12-01). "An introduction to illegal wildlife trade and its effects on biodiversity and society". Forensic Science International: Animals and Environments. 3: 100064. doi:10.1016/j.fsiae.2023.100064. ISSN 2666-9374.
  24. ^ Norris, K., Asase, A., Collen, B., Gockowksi, J., Mason, J., Phalan, B., & Wade, A. (2010). Biodiversity in a forest-agriculture mosaic–The changing face of West African rainforests. Biological conservation, 143(10), 2341-2350.
  25. ^ Nasi, R., Brown, D., Wilkie, D., Bennett, E., Tutin, C., Van Tol, G., & Christophersen, T. (2008). Conservation and use of wildlife-based resources: the bushmeat crisis. Secretariat of the Convention on Biological Diversity, Montreal. and Center for International Forestry Research (CIFOR), Bogor. Technical Series, 50.
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