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Land-use and land-cover affect inland fish catch in two rivers of Central Africa

Water Biology and Security 2022年第4期1卷 51-60页

作者： Leandro Castello Gifty Anane-Taabeah Attu anthony aliebe Nelly Ornelle Onana Ateba Sandrine Jueya Felipe Carvalho Amy Ickowitz Emmanuel A.Frimpong Department of Fish&Wildlife Conservation Virginia Polytechnic Institute and State UniversityBlacksburgVAUnited States Department of Fisheries and Watershed Management Kwame Nkrumah University of Science and TechnologyKumasiGhana Farmerline Limited KumasiGhana Department of Parasitology and Ecology University of Yaounde 1YaoundeCameroon Faculty of Sciences University of NgaoundereNgaoundereCameroon Center for International Forestry Research BogorIndonesia

Land-cover change can affect inland fisheries,which underpin food security of millions of people *** of forests from very large floodplains has been found to decrease fish catch via loss of feeding and nursery habitat for ***,it is unknown if similar effects occur in smaller rivers with limited floodplain *** is also known about the mechanisms by which land-cover changes affect inland fish ***,we assessed land-use and land-cover(LULC)effects on fish catch,diet,and condition at sites in two medium-sized rivers of Cameroon,in Central *** found that LULC explained 30%of the variation in fish catch,with the catch of five species being positively,and of two species being negatively,related to floodplain *** niche breadth of fish diets was higher in the river surrounded by forests than in the river surrounded by agricultural ***,contrary to expectations,condition of the fish,as indicated by occurrence of diseases or deformities,eroded fins,lesions or tumors,was not related to *** results support the notions that floodplain forests support fish populations in rivers with limited floodplain areas in ways similar to that of rivers with large floodplains,and that LULC affects fish populations via changes in fish diets and instream habitat features(i.e.,riparian canopy closure,water clarity,substrate heterogeneity,and habitat volume).These effects imply that prevailing changes in LULC threaten the food and livelihood security services provided by inland fisheries,highlighting the importance of policies that maintain native vegetation along riverbanks and in floodplain areas.

关键词： Agriculture Diet Fish traits Food security LULC

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