Maria Fernanda Brito de Almeida, Renata Bernardes Faria Campos, Fernanda Vieira da Costa, Ricardo Idelfonso de Campos, Giselle Martins Lourenço, Cinthia Borges da Costa Milanez, Sérvio Pontes Ribeiro
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引用次数: 0
Abstract
Natural ecotones between forest and lake-swamp succession impose severe environmental filters for ant fauna, compared to adjacent forest habitats. This filter effect may be more severe for soil than canopy fauna. We tested this hypothesis by investigating the patterns of species occurrence, richness and composition of soil and canopy ants in forest and lake-swamp ecotones in a tropical river basin. We established two transects (250 m) at each site, one placed in the ecotone (i.e., flood zone) and the other inside the adjacent forest. Although upper and lower river basin had totally different ant species composition, the species occurrence, richness and composition distribution between habitats followed a similar pattern for both altitudes. Occurrence of soil ants and species richness was similar between interior and ecotone. The occurrence and species richness of canopy ants were both higher in the ecotones than in the forest interior. Ant species composition was similar between the ecotone and adjacent forest, for both soil and canopy fauna, and the ant species composition was different between seasons (dry and rainy) and between canopy and soil fauna. Most importantly, the environmental filter imposed by the ecotone and its unpredictable habitat conditions favoured fewer but opportunistic species, which drove the higher occurrence in these habitats. The years we studied were particularly dry and had a substantial decrease in lake depth. Hence, the abilities of species to best use unpredictable resources from the natural succession on the new dry grounds might have been defined by omnivorous, opportunistic and numerically dominant ants. The abiotic particularities of forest-water ecotones are important in the temporal dynamics of ant species assemblages. Fluctuations in water dynamics can restrict soil assemblages, but subtle changes in soil flooding also affect canopy fauna and can have unpredictable effects due to intensified variations in seasonal dynamics.
期刊介绍：
Austral Ecology is the premier journal for basic and applied ecology in the Southern Hemisphere. As the official Journal of The Ecological Society of Australia (ESA), Austral Ecology addresses the commonality between ecosystems in Australia and many parts of southern Africa, South America, New Zealand and Oceania. For example many species in the unique biotas of these regions share common Gondwana ancestors. ESA''s aim is to publish innovative research to encourage the sharing of information and experiences that enrich the understanding of the ecology of the Southern Hemisphere.
Austral Ecology involves an editorial board with representatives from Australia, South Africa, New Zealand, Brazil and Argentina. These representatives provide expert opinions, access to qualified reviewers and act as a focus for attracting a wide range of contributions from countries across the region.
Austral Ecology publishes original papers describing experimental, observational or theoretical studies on terrestrial, marine or freshwater systems, which are considered without taxonomic bias. Special thematic issues are published regularly, including symposia on the ecology of estuaries and soft sediment habitats, freshwater systems and coral reef fish.
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