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• W799467770 abstract "Human impact on tropical ecosystems has a pervasive effect on large bodied vertebrate populations. The absence of large mammals causes a lack of fundamental processes performed by them within the plant communities, such as herbivory, trampling, seed predation and seed dispersal. Species loss results in loss of ecological functions altering the proper functioning of the ecosystem. This dissertation is organized into two chapters. Firstly (Chapter I: Selective mammal defaunation changes functional diversity in continuous Atlantic rainforests) we analyzed how changes in species richness and abundance of mid and large forest-dwelling mammals affect functional diversity in a tropical forest, the Brazilian Atlantic Forest. We found that, despite the fact that the four studied sites compose the same Atlantic Forest continuum, species richness and abundance were not similar between sites and in one of four sites we found an alteration in functional diversity, which reveals the existence of distinct large mammal communities in these areas. Secondly (Chapter II: Consequences of herbivores extinction on plant diversity in a gradient of defaunation) we investigated whether the absence of large mammals alters seedling species richness, density and beta diversity in the same areas. We found that at peccary-present sites, the presence of large herbivorous mammals (open plots) causes a tendency of decrease in seedling density and a tendency of increase in beta diversity, but we found no pattern of their effect over seedling richness. At peccary-absent sites, the presence of large herbivorous mammals (open plots) causes no changes in seedling richness and in beta diversity, but we found no pattern of their effect over seedling density. The extinction of large mammals may result in worrying consequences over plant communities, being the white-lipped peccary, Tayassu pecari, the major driver of plant community changes, which makes white-lipped peccaries conservation fundamental for a healthy functioning of the ecosystem. Knowing the consequences of extinctions of particular mammal species will allow us to better understand the importance of each piece of tropical mammalian food webs and better delineate further conservation strategies. Key-words: Atlantic forest, beta diversity, functional diversity, trophic cascades." @default.
• W799467770 created "2016-06-24" @default.
• W799467770 creator A5075415017 @default.
• W799467770 date "2013-06-13" @default.
• W799467770 modified "2023-09-23" @default.
• W799467770 title "Extinção ecológica de grandes herbívoros e diversidade de plantas em um gradiente de defaunação na Mata Atlântica" @default.
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