Preponderância da dinâmica hidrológica sobre a sincronia e padrões de diversidade beta de comunidades zooplanctônicas
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2015-03-27
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Universidade Federal de Goiás
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Several studies have shown that spatial synchrony is a ubiquitous pattern, occurring in
different regions, types of ecosystems and in different groups of organisms. Spatial
synchrony has important implications for the persistence of populations. Another
implication is the possibility of using local "sentinels" sites, assuming regionalized or
synchronous dynamics over the whole area of interest. In this context, our work uses a
long-term (8 years) data set to quantify the level of synchrony between local
zooplankton populations in a tropical reservoir. We expect high synchrony due to high
connectivity as well as due to the Moran effect. Population synchrony was negatively
correlated with geographic distance. However, population synchrony declined more
consistently with environmental distance and environmental synchrony than with
geographic distance. Besides, our results suggested that main variables driving
synchrony were those correlated with hydrological conditions. Geographic distance was
more important for protozoans, while the population synchrony of the other
zooplankton groups was strongly driven by environmental synchrony. Furthermore, we
found a decrease of environmental synchrony with the increase of geographical distance
between points. Our results suggest that the strength of the Moran’s effect may be
underestimated when simple environmental distances are used. We suggest that further
studies should allow for environmental synchrony instead of allowing only for
environmental similarity. Finally, despite significant, population synchrony was not so
high to justify a reduction in the number of sampling sites.
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LOPES, V. G. Preponderância da dinâmica hidrológica sobre a sincronia e padrões de diversidade beta de comunidades zooplanctônicas. 2015. 95 f. Tese (Doutorado em Ecologia e Evolução) - Universidade Federal de Goiás, Goiânia, 2015.