Diversidade e estruturação de assembleias de girinos no Cerrado em diferentes escalas espaciais
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2015-03-30
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Universidade Federal de Goiás
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To simplify and measure all the great diversity of life on Earth we use models to summarize the
processes driving community patterns. The community models structured by deterministic processes
are based on species niche. Those models structured by stochastic processes are based on disperson and
ecological drift. The spatial scale (i.e. extent) is a very important factor to evaluate the relative
importance of deterministic and stochastic processes, because it determines the spatial and
environmental heterogeneity. Traditionally, we consider that local species interactions with the
environment and other species are important in explaining the diversity at the local level, while in
larger geographic scales the differences in species niche could be not so important and these follow a
probabilistic distribution of extinction and colonization processes. However, a opposite idea has arisen,
that niche could have a greater influence on large scales and stochastic events may predominate at
small scales. The organism type is also important for assemblies studies due to differences in dispersal
ability. Tadpoles depend on the adult form to disperse and frogs generally have low movement ability.
Thus, the spatial scale and the organism type will determine the relative importance of deterministic
and stochastic factors in assemblies studies.
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FAVA, F. G. Diversidade e estruturação de assembleias de girinos no Cerrado em diferentes escalas espaciais. 2015. 72 f. Dissertação (Mestrado em Ecologia e Evolução) - Universidade Federal de Goiás, Goiânia, 2015.