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- Andersson Djurfeldt, Agnes, et al.
(författare)
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Drills and Diets, Consumption and Conservation– the Role of Primate Meat in Local Diets in and Around Cross River National Park, Nigeria
- 2017
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Ingår i: Journal of Poverty Alleviation and International Development. - 2233-6192. ; 8:2
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Tidskriftsartikel (refereegranskat)abstract
- The study uses household level data from four villages inand around Cross River National Park (CRNP), Nigeria to assess therole of primate meat in local livelihoods and diets. Okwangwo is anenclave community within the national park, Butatong houses theCRNP headquarters. Kanyang1 and Abo Ebam are located fartheraway from the park. 149 respondents were surveyed. Sale ofbushmeat contributed 4 percent of total cash income on average, butis important as a source of protein in the context of poorly developedlivestock systems. 98 percent of the households ate bushmeat duringthe past year and 74 percent hunted for consumption. 77 percent atemeat from primates, although this varied from 53 percent in Butatongto 97 percent in Okwangwo. Differences emerge among the villageswith less reliance on bushmeat, less hunting and a dietary shifttowards poultry in Butatong. There is no correlation between incomelevels and consumption of primate meat. The overwhelming motivefor eating primate meat was taste preferences. Solutions tounsustainable extraction of primate meat must be sourced in relationto local consumption. Improving access to animal source foods,through widening the livestock basis of local agrarian
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| 2. |
- Effiom, Edu, et al.
(författare)
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Changes of community composition at multiple trophic levels due to hunting in Nigerian tropical forest
- 2014
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Ingår i: Ecography. - : Wiley. - 1600-0587 .- 0906-7590. ; 37, s. 367-377
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Tidskriftsartikel (refereegranskat)abstract
- Hunting in tropical forests decimates large mammals, and this may have direct and indirect effects on other trophic levels and lead to trophic cascades. We compared replicated sites of hunted and protected forests in southeastern Nigeria, with respect to community composition of primates, other mammals, birds, plant seedlings, and mature trees. We make predictions regarding the community composition at the different trophic levels. In forests where large primates are rare, we hypothesize that their ecological role will not be fully compensated for by small frugivores. We apply multivariate methods to assess changes in community composition of mammals, birds, and seedlings, controlling for any differences between sites in the other groups, including mature trees. Medium and large (4–180 kg) primates were much rarer in hunted sites, while porcupine and rock hyrax increased in abundance with hunting. In contrast, the community composition of birds was similar in both types of forests. Seedling communities were significantly related to the community composition of mammals, and thus strongly affected by hunting. In protected forests primate dispersed plant seedling species dominated, whereas in hunted forests the seedling community was shifted towards one dominated by abiotically dispersed species. This was probably both a consequence of reduced seed dispersal by primates, and increased seed predation by rodents and hyrax. Hence we found no evidence for buffering effects on tree regeneration through functional compensation by non-hunted animals (such as birds). Our results highlight how seedling communities are changed by the complex plant–animal intera ctions, triggered by the loss of seed dispersers. The results predict a rarity of primate-dispersed trees in future tropical forest canopies; a forest less diverse in timber and non-timber resources.
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| 4. |
- Olsson, Ola, et al.
(författare)
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Competition, seed dispersal and hunting : What drives germination and seedling survival in an Afrotropical forest?
- 2019
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Ingår i: AoB Plants. - : Oxford University Press (OUP). - 2041-2851. ; 11:2
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Tidskriftsartikel (refereegranskat)abstract
- Disentangling the contributions of different processes that influence plant recruitment, such as competition and seed dispersal, is important given the increased human-mediated changes in tropical forest ecosystems. Previous studies have shown that seedling communities in an Afrotropical rainforest in southeastern Nigeria are strongly affected by the loss of important seed-dispersing primates, including Cross River gorillas (Gorilla gorilla diehli), chimpanzee (Pan troglodytes elioti) and drill (Mandrillus leucophaeus). Here we study how germination and survival of tree seedlings are affected by competition and reduced seed dispersal in three contiguous forest reserves, in southeastern Nigeria, with similar mature tree species composition and structure. We use an experimental design aimed at manipulating the effect of competition among seedlings in three protected and three hunted sites within the reserves. We use a total of sixty 5 × 5 m plots of three types: plots cleared of all seedlings, plots selectively cleared of all primate-dispersed seedlings and control plots. All seedlings were identified, measured, assigned to dispersal mode and tagged, and after 1 year we evaluated survival, mortality and new recruits. We found that in hunted sites germination of abiotically dispersed species was over four times higher in cleared plots compared to control plots, whereas germination of primate-dispersed species was the same, which indicated that dispersal limitation was the dominant force in seedling recruitment in hunted sites. This was supported by the fact that the germination of all dispersal modes in the selectively cleared plots in protected sites was similar to the control plots in the same sites, but germination of abiotically dispersed species was significantly lower than in cleared plots in hunted sites. Competition among seedlings was mostly evident from the fact that 75 % more seedlings of primate-dispersed species germinated in cleared compared to control plots in protected sites. We conclude that inter-seedling competition may be irrelevant to seedling recruitment in hunted sites, where dispersal limitation appears to be a much stronger force shaping the seedling plant community, and thus hunting indirectly reverses the importance of competition and dispersal limitation in structuring seedling communities.
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