Compositional uniqueness of diatoms and insects in subtropical streams is weakly correlated with riffle position and environmental uniqueness
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2019
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Resumo
Some local communities contribute more
to beta diversity than others, which has been known as
compositional uniqueness or local contribution to beta
diversity. Compositional uniqueness should correlate
positively with environmental uniqueness and site
isolation. We evaluated compositional uniqueness
(total and in terms of species replacement and
nestedness) of periphytic diatoms and insects in
subtropical streams and tested for correlates of these
metrics. We sampled 90 riffles in a near-pristine catchment in the southeast Atlantic Forest of Brazil.
The total compositional uniqueness for diatoms and
insects were not associated to riffle position. However,
the total compositional uniqueness of diatoms (presence–absence data), was correlated with the uniqueness of streambed substrate composition, while the
total compositional uniqueness of insects did not
correlate with any explanatory variable. The compositional uniqueness in terms of nestedness (presence–
absence data) for diatoms and for insects (abundance
data) was correlated positively with the uniqueness of
substrate composition. Compositional uniqueness in
terms of species replacement (abundance data) for
insects was correlated negatively with the uniqueness
of substrate composition. Our results indicate that
subtle differences in environmental uniqueness, play a
role in determining beta diversity in near-pristine
streams. However, finding strong correlates of compositional uniqueness proved to be a difficult task.
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Compositional variation, LCBD, Nestedness, Replacement
Citação
CASTRO, Emanuela; SIQUEIRA, Tadeu; MELO, Adriano Sanches; BINI, Luis Mauricio; LANDEIRO, Victor Lemes; SCHNECK, Fabiana. Compositional uniqueness of diatoms and insects in subtropical streams is weakly correlated with riffle position and environmental uniqueness. Hydrobiologia, Berlim, v. 842, p. 219-232, 2019. DOI: 10.1007/s10750-019-04037-8 Disponível em: https://link.springer.com/article/10.1007/s10750-019-04037-8. Acesso em: 2 jun. 2023.