Due to unabated anthropogenic exploitations, mangrove forests globally are constantly under pressure and degradation, which may result in the reduction of ecosystem functioning and biodiversity. Molluscan fauna, which is one of the main macroinvertebrates that play a major ecological role in nutrient dynamics in mangroves, are sensitive to the changes in their habitat. This survey aims to assess the impact of anthropogenic activities on the diversity of molluscs’ communities in the mangrove forest. Anthropogenic disturbances within 20 sampling sites were valued at six mangrove stands and patched scoring the degree of influence according to vegetation, structure, waste and trampling. Molluscs were caught by hand and counted within 1 × 1 m2 plots placed at three points distant of 50 m established using a straight line transect of 100 m. Upon the 20 sites investigated, five were slightly disturbed, eight moderately disturbed and seven sites were highly disturbed. The mean abundance of molluscs decreased from slightly disturbed areas (172.25 ± 73.09 Ind·m−2) to highly disturbed areas (100.57 ± 62.84 Ind·m−2). Highly disturbed areas have shown lower species richness (R = 1.09 ± 0.15) and diversity (H’ = 2.30 ± 0.31). Human activities in the mangrove forest could particularly have effects on the diversity of molluscs, however, feature potential conservation measures have to be in harmony with the needs of the local population.
References
[1]
Din, N., Ngo-Massou, V.M., Essomè-Koum, G.L., Ndema-nsombo, E., Kottè-Mapoko, E.F. and Nyamsi-Moussian, L. (2017) Impact of Urbanization on the Evolution of Mangrove Ecosystems in the Wouri River Estuary (Douala Cameroon). In: Finkl, C.W. and Makowski, C., Eds., Coastal Wetlands: Alteration and Remediation, Vol. 21, Springer, Cham, 81-131. https://doi.org/10.1007/978-3-319-56179-0_3
[2]
Kauffman, J.B., Bernardino, A.F., Ferreira, T.O., Bolton, N.W., Gomes, L.E.O. and Nobrega, G.N. (2018) Shrimp Ponds Lead to Massive Loss of Soil Carbon and Greenhouse Gas Emissions in Northeastern Brazilian Man-Groves. Ecology and Evolution, 8, 5530-5540. https://doi.org/10.1002/ece3.4079
[3]
UNEP (United Nations Environment Programme) (2014) The Importance of Mangroves to People: A Call to Action. World Conservation Monitoring Center, Cambridge, 128 p.
[4]
Carugati, L., Gatto, B., Rastelli, E., Lo Martire, M., Coral, C., Greco, S. and Danovaro, R. (2018) Impact of Mangrove Forests Degradation on Biodiversity and Ecosystem Functioning. Scientific Reports, 8, Article No. 13298 https://doi.org/10.1038/s41598-018-31683-0
[5]
Alongi, D.M. (2018) Impact of Global Change on Nutrient Dynamics in Mangrove Forests. Forests, 9, Article No. 596. https://doi.org/10.3390/f9100596
[6]
Nagelkerken, I., Blaber, S.J.M., Bouillon, S., Green, P., Haywood, M., Kirton, L.G. and Somerfield, P.J. (2008) The Habitat Function of Mangroves for Terrestrial and Marine Fauna: A Review. Aquatic Botany, 89, 155-185. https://doi.org/10.1016/j.aquabot.2007.12.007
[7]
Cannicci, S., Burrows, D., Fratini, S., Lee, S.Y., Smith III, T.J., Offenberg, J. and Dahdouh-Guebas, F. (2008) Faunistic Impact on Vegetation Structure and Ecosystem Function in Mangrove Forests: A Review. Aquatic Botany, 89, 186-200. https://doi.org/10.1016/j.aquabot.2008.01.009
[8]
Kottè-Mapoko, E.F., Ngo-Massou, V.M., Essomè-Koum, L.G., Emane, J.M., Nyamsi-Moussian, L., Tchoffo, R. and Din, N. (2017) Molluscs’ Composition and Distribution in Mangroves of the Cameroon Central Coast. International Journal of Research Studies in Biosciences, 5, 4-13.
[9]
Zvonareva, S.S., Mekhova, E.S., Hà, V.T. and Kantor, Y.I. (2019) Checklist of Bivalve Molluscs in Mangroves of Khánh Hòa Province, Vietnam. Molluscan Research, 39, 296-312. https://doi.org/10.1080/13235818.2019.1638567
[10]
Kabir, M., Abolfathi, M., Hajimoradloo, A., Zahedi, S., Kathiresan, K. and Goli, S. (2014) Effect of Mangroves on Distribution, Diversity and Abundance of Molluscs in Mangrove Ecosystem: A Review. AACL Bioflux, 7, 286-300.
[11]
Al-Khayat, J.A., Vethamony, P. and Nanajkar, M. (2021) Molluscan Diversity Influenced by Mangrove Habitat in the Khors of Qatar. Wetlands, 41, Article No. 45. https://doi.org/10.1007/s13157-021-01441-6
[12]
Susan, V.D., Pillai, N.G.K. and Satheeshkumar, P. (2012) A Checklist and Spatial Distribution of Molluscan Fauna in Minicoy Island, Lakshadweep, India. World Journal of Fish and Marine Sciences, 4, 449-453.
[13]
Saad, L.O., Cunha, C.M. and Colpo, K.D. (2019) How Mollusk Assemblages Respond to Different Urbanization Levels: Characterization of the Malacofauna in Subtropical Brazilian Mangroves. Marine Biodiversity, 49, 989-999. https://doi.org/10.1007/s12526-018-0883-8
[14]
Plaziat, J.C. (1974) Répartition des mollusques amphibies de quelques littoraux et estuaires à mangroves (Nouvelle Calédonie et Cameroun). Haliotis, 4, 167-177.
[15]
Bandel, K. and Kowalke, T. (1999) Gastropod fauna of the Cameroonian coasts. Helgoland Marine Research, 53, 129-140. https://doi.org/10.1007/s101520050016
[16]
Ngo-Massou, V.M., Essomè-Koum, G.L., Ngollo-Dina, E. and Din, N. (2012) Composition of Macrobenthos in the Wouri River Estuary Mangrove, Douala, Cameroon. African Journal of Marine Science, 34, 349-360. https://doi.org/10.2989/1814232X.2012.725288
[17]
Din, N., Saenger, P., Dibong, D.S., Priso, R.J. and Blasco, F. (2008) Logging Activities in Mangrove Forests: A Case Study of Douala Cameroon. African Journal of Environmental Science and Technology, 2, 22-30.
[18]
Nfotabong-Atheull, A., Din, N. and Dahdouh-Guebas, F. (2013) Qualitative and Quantitative Characterization of Mangrove Vegetation Structure and Dynamics in a Peri-Urban Setting of Douala (Cameroon): An Approach Using Air-Borne Imagery. Estuaries and Coasts, 36, 1181-1192. https://doi.org/10.1007/s12237-013-9638-8
[19]
Fusi, M., Beone, G.M., Suciu, N.A., Sacchi, A., Trevisan, M., Capri, E., Daffonchio, D., Din, N., Dahdouh-Guebas, F. and Cannicci, S. (2016) Ecological Status and Sources of Anthropogenic Contaminants in Mangroves of the Wouri River Estuary (Cameroon). Marine Pollution Bulletin, 109, 723-733. https://doi.org/10.1016/j.marpolbul.2016.06.104
[20]
Giresse, P., Megope-Foonde, J.P., Ngueutchoua, G., Aloisi, J.C., Kuete, M. and Monteillet, J. (1996) Carte sédimentologique du plateau continental du Camerounà à 1/200000. ORSTOM, Paris.
[21]
Nfotabong-Atheull, A. (2011) Impact of Anthropogenic Activities on the Vegetation Structure of Mangrove Forests in Kribi, the Nyong River Mouth and Cameroon Estuary. PhD Thesis, Université Libre de Bruxelles-ULB, Brussels, Belgium/The University of Douala, Cameroon.
[22]
Ngo-Massou, V.M., Din, N., Kenne, M. and Dongmo, A.B. (2018) Brachyuran Crab Diversity and Abundance Patterns in the Mangroves of Cameroon. Regional Studies in Marine Science, 24, 324-335. https://doi.org/10.1016/j.rsma.2018.09.010
[23]
Din, N., Ngo-Massou, V.M., Kottè-Mapoko, E.F., Essoh-Mongo, M.C. and Essomè-koum, G.L. (2014) Evolution of Mangrove Crabs Distribution in the Atlantic Coast of Cameroon. In: Ardovini, C., Ed., Crabs Global Diversity, Behavior and Environmental Threats, Nova Science Publishers Inc., New York, 161-180.
[24]
Blanco-Libreros, J.F. and Estrada-Urrea, E.A. (2015) Mangroves on the Edge: Anthrome-Dependent Fragmentation Influences Ecological Condition (Turbo, Colombia, Southern Caribbean). Diversity, 7, 206-228. https://doi.org/10.3390/d7030206
[25]
Rodrigues, C.A.L., Ribeiro, R.P., Santos, N.B. and Almeida, Z.S. (2016) Patterns of Mollusc Distribution in Mangroves from the São Marcos Bay, Coast of Maranhão State, Brazil. Acta Amazonica, 46, 391-400. https://doi.org/10.1590/1809-4392201600493
[26]
Imakulata, M.M. and Tokan, M.K. (2018) Species Composition, Density and Dominance of Arboreal Mangrove Molluscs on the Paradiso Beach of Kupang City, Indonesia. AACL Bioflux, 11, 1001-1008.
[27]
Dajoz, R. (1985) Precis d’écologie. Dunod, Paris, 489 p.
[28]
Tessier, E., (2005) Dynamique des peuplements ichtyologiques associés aux récifs artificiels à l'île de la Réunion (ouest de l'océan Indien)—Implication dans la gestion des pêcheries côtières. Thèse de doctorat, Université de la Réunion, Réunion, 236 p.
[29]
Hutchison, J., Manica, A., Swetnam, R., Balmford, A. and Spalding, M. (2013) Predicting Global Patterns in Mangrove Forest Biomass. Conservation Letter, 7, 233-240. https://doi.org/10.1111/conl.12060
[30]
Butchart, S.H., Walpole, M., Collen, B., Van Strien, A., Scharlemann, J.P., Almond, R.E. and Watson, R. (2010) Global Biodiversity: Indicators of Recent Declines. Science, 328, 1164-1168. https://doi.org/10.1126/science.1187512
[31]
Walters, B.B., Ronnback, P.P., Kovacs, J.M., Crona, B., Hussain, S.A., Badola, R., Primavera, J.H., Barbier, E. and Dahdouh-Guebas, F. (2008) Ethnobiology, Socio-Economics and Management of Mangrove Forests: A Review. Aquatic Botany, 89, 220-236. https://doi.org/10.1016/j.aquabot.2008.02.009
[32]
Walsh, C.J., Roy, A.H., Feminella, J.W., Cottingham, P.D., Groffman, P.M. and Morgan, R.P. (2005) The Urban Stream Syndrome: Current Knowledge and the Search for a Cure. Journal of the North American Benthological Society, 24, 706-723. https://doi.org/10.1899/04-028.1
[33]
Beasley, C.R., Fernandes, C.M., Gomes, C.P., Brito, B.A., Dos Santos, S.M.L. and Tagliaro, C.H. (2005) Molluscan Diversity and Abundance among Coastal Habitats of Northern Brazil. Ecotropica, 11, 9-20.
[34]
Jenouvrier, S., Barbraud, C. and Weimerskirch, H. (2003) Effects of Climate Variability on the Temporal Population Dynamics of Southern Fulmars. Journal of Animal Ecology, 72, 576-587. https://doi.org/10.1046/j.1365-2656.2003.00727.x
[35]
Lee, S.Y., Primavera, J.H., Dahdouh-Guebas, F., Mckee, K., Bosire, J.O., Cannicci, S. and Record, S. (2014) Ecological Role and Services of Tropical Mangrove Ecosystems: A Reassessment. Global Ecology and Biogeography, 23, 726-743. https://doi.org/10.1111/geb.12155
[36]
Aviz, D., Rodrigues, I.L. and Rosa-Filho, J.S. (2012) Spatial and Temporal Changes in Macrobenthic Communities in the Amazon Coastal Zone (Guajará Estuary, Brazil) Caused by Discharge of Urban Effluents. Scientia Marina, 76, 381-390. https://doi.org/10.3989/scimar.03312.16C
[37]
Primavera, J.H., Friess, D.A., Van Lavieren, H. and Lee, S.Y. (2019) The Mangrove Ecosystem. In: Sheppard, C., Ed., World Seas: An Environmental Evaluation: Ecological Issues and Environmental Impacts, Vol. 3, Academic Press, Waltham, 1-34. https://doi.org/10.1016/B978-0-12-805052-1.00001-2
[38]
Skilleter, G.A. and Warren, S. (2000) Effects of Habitat Modification in Mangroves on the Structure of Mollusc and Crab Assemblages. Journal of Experimental Marine Biology and Ecology, 244, 107-129. https://doi.org/10.1016/S0022-0981(99)00133-1
[39]
Chapman, M.G., Michie, K. and Lasiak, T. (2005) Responses of Gastropods to Change in Amounts of Leaf Litter and Algae in Mangrove Forests. Journal of the Marine Biological Association of the United Kingdom, 85, 1481-1488. https://doi.org/10.1017/S0025315405012671
