Ecological relationships between phytoplankton communities and different spatial scales in European reservoirs: implications at catchment level monitoring programmes.
Data
2009
Autores
Cabral, João Alexandre
Cortes, Rui
Lourenço, Martinho
Título da revista
ISSN da revista
Título do Volume
Editora
J. Padisak
Resumo
Phytoplankton communities are structured
by factors acting over temporal and spatial scales.
Identifying which factors are driving spatial patterns in
aquatic communities is the central aim of ecology. In
this study, data sets of phytoplankton communities and
environmental data of two Portuguese reservoirs types
(lowland ‘‘riverine reservoirs’’ and higher altitude
‘‘artificial lake reservoirs’’) were used to determine the
importance of environmental variables at different
spatial (geographical, regional and local) and time
scales (seasons, years) on the community structure. In
all the data sets, the multivariate ordination technique
Canonical Correspondence Analysis (CCA) showed
that regional and local scales explained the majority
(9–18% and 13–19%, respectively) of the taxa variance.
However, for ‘‘riverine reservoirs’’, time
variables were more important, explaining 27% of
the variability in phytoplankton assemblages. Variance
partitioning was used to assess the individual importance
of the three spatial scales and time for the
community structure of the two reservoir types. The
majority of among-site variability (5.9–21.4%) was
accounted for by time variables, with local, regional,
and geographical scale variables accounting for 3.3–
5.6%, 3.7–4.5% and 2.6–2.9%, respectively. The
effects of different spatial scales on phytoplankton
communities were clearly interrelated; thus, implying
that phytoplankton assemblages are capable of detecting
stress from catchment to site scales.
Descrição
Palavras-chave
Phytoplankton , Ecological status , Reservoirs , Spatial scales , Multivariate analysis , Partial constrained ordination
Citação
Cabecinha E. et al, 2009