The roles of dispersal limitation and environmental conditions in controlling caddisfly (Trichoptera) assemblages
Carregando...
Data
2012-06-14
Título da Revista
ISSN da Revista
Título de Volume
Editor
Resumo
1. Many recent studies have quantified the relative importance of environmental variables and
dispersal limitations in shaping the structure of stream communities. However, the relative
importance of these factors at different spatial extents has been seldom evaluated.
2. We analysed the distribution of caddisfly species in 89 Amazonian streams in relation to stream
characteristics and spatial variables representing overland dispersal routes. The streams occur in
three regions that differ in spatial extent and environmental characteristics. We analysed the data
using partial redundancy analysis with two predictor data sets, one environmental and one
spatial, to evaluate the variation in assemblage composition. We also separated caddisflies into
‘good’ and ‘poor’ dispersers to evaluate possible differences in the responses of these two groups.
3. The environmental component explained a higher proportion of variance in assemblage
composition than did the spatial component. Spatial effects were evident only when data from all
three regions were analysed together, although the exclusive spatial fraction was quite low. Good
dispersers responded similarly to the community as a whole, while poor dispersers were related to
environmental variables only in one region and also were not related to spatial variables.
4. Caddisflies were most affected by environmental factors. The large environmental effect and
small spatial effect are in accord with the use of these stream insects as good indicators of site
properties and disturbances in monitoring programmes.
Descrição
v. 57, p. 1554-1564, 2012.
Palavras-chave
Amazonia, Metacommunities, Neotropical streams, Redundancy analysis, Spatial analysis
Citação
LANDEIRO, Victor Lemes; BINI, Luis Mauricio.; MELO, Adriano S.; PES, Ana Maria Oliveira; MAGNUSSON, William Ernest. The roles of dispersal limitation and environmental conditions in controlling caddisfly (Trichoptera) assemblages. Freshwater Biology, v. 57, p. 1554-1564, 2012. Disponível em: <http://onlinelibrary.wiley.com/doi/10.1111/j.1365-2427.2012.02816.x/epdf>.