7 documents found, page 1 of 1
Pervasive gaps in Amazonian ecological research
Carvalho, Raquel L.; Resende, Angelica F.; Barlow, Jos; França, Filipe M.; Moura, Mario R.; Maciel, Rafaella; Alves-Martins, Fernanda; Shutt, JackBiodiversity loss is one of the main challenges of our time,1,2 and attempts to address it require a clear un derstanding of how ecological communities respond to environmental change across time and space.3,4 While the increasing availability of global databases on ecological communities has advanced our knowledge of biodiversity sensitivity to environmental changes,5–7 vast areas of the tropics remain underst...
Protected areas: A focus on Brazilian freshwater biodiversity
Azevedo-Santos, Valter Monteiro de; Frederico, Renata Guimarães; Fagundes, Camila Kurzmann; dos Santos Pompeu, Paulo; Pelicice, Fernando MayerBrazil has a variety of aquatic ecosystems and rich freshwater biodiversity, but these components have been constantly damaged by the expansion of unsustainable activities. An array of different conservation strategies is needed, especially the creation of protected areas (PAs, hereafter). However, Brazil's PAs are biased towards terrestrial ecosystems and we argue that current PAs have limited efficacy in the ...
Mecanismos que afetam os estados estáveis alternativos e o efeito das mudanças ...
Mormul, Roger PauloThe alternative stable states and climate changes are the main themes discussed throughout the three chapters in this dissertation. In the first chapter I used a long term dataset of the Long Term Ecological Research program (LTER), in the Paraná River floodplain, to describe by the first time in this LTER site an alteration in the alternative state in one floodplain lake. The analyses showed that reduction in ...
Efeito da complexidade estrutural e da distância da fonte de dispersão sobre a ...
Mormul, Roger PauloThe structural complexity of habitats and distance from dispersion source has been considered important determinants of species diversity. Measures of fractal geometry are a strong alternative to quantify the first variable. In this paper we tested the hypothesis that structural complexity and distance from a dispersion source affect the density and diversity of macro-invertebrates on submerged macrophytes. To ...
Richness and composition of macrophyte assemblages in four Amazonian lakes - do...
Mormul, Roger Paulo; Thomaz, Sidinei Magela; Vieira, Lisandro Juno SoaresAquatic macrophytes are an important component in the structure of lakes in Neotropical floodplains, for example, because they support a high diversity of invertebrates and vertebrates. In this paper, we tested whether or not the variability of macrophyte assemblages is lower in spatially close quadrats than among quadrats of different lakes. The study was carried in four lakes in a large Amazonian floodplain (...
The study of fractals among ecologists - doi: 10.4025/actascibiolsci.v34i1.7701
Mormul, Roger Paulo; Padial, André AndrianFractals seemed to have permeated most of scientific fields, including ecology. In fact, biodiversity and ecological processes are affected by spatial complexity, and fractals can help understand patterns at multiple scales. In this paper we evaluated the main quantitative trends and the profile of ecological publications using fractals. Publication about fractals in Ecology experienced a high increase in the l...
Succession of invertebrates during the decomposition process of two aquatic pla...
Mormul, Roger Paulo; Vieira, Luiz Alberto; Pressinatti Júnior, Sidnei; Monkolski, Alexandre; Santos, Anderson Medeiros dosThe invertebrate colonization was investigated during 56-day decomposition of two macrophytes species (Eichhornia azurea and Polygonum ferrugineum). The aim was to determine the role of macroinvertebrates in the process of leaf fragmentation. During material analysis, 2096 invertebrates were associated with E.azurea and 6154 were associated with P. ferrugineum, identified in 18 taxons, with predominance of Dipt...