A comparative analysis reveals weak relationships between ecological factors and beta diversity of stream insect metacommunities at two spatial levels
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2015-03
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Resumo
The hypotheses that beta diversity should increase with decreasing latitude and
increase with spatial extent of a region have rarely been tested based on a comparative
analysis of multiple datasets, and no such study has focused on stream
insects. We first assessed how well variability in beta diversity of stream insect
metacommunities is predicted by insect group, latitude, spatial extent, altitudinal
range, and dataset properties across multiple drainage basins throughout the
world. Second, we assessed the relative roles of environmental and spatial factors
in driving variation in assemblage composition within each drainage basin.
Our analyses were based on a dataset of 95 stream insect metacommunities
from 31 drainage basins distributed around the world. We used dissimilaritybased
indices to quantify beta diversity for each metacommunity and,
subsequently, regressed beta diversity on insect group, latitude, spatial extent,
altitudinal range, and dataset properties (e.g., number of sites and percentage of presences). Within each metacommunity, we used a combination of spatial eigenfunction
analyses and partial redundancy analysis to partition variation in
assemblage structure into environmental, shared, spatial, and unexplained fractions.
We found that dataset properties were more important predictors of beta
diversity than ecological and geographical factors across multiple drainage
basins. In the within-basin analyses, environmental and spatial variables were
generally poor predictors of variation in assemblage composition. Our results
revealed deviation from general biodiversity patterns because beta diversity did
not show the expected decreasing trend with latitude. Our results also call for
reconsideration of just how predictable stream assemblages are along ecological
gradients, with implications for environmental assessment and conservation
decisions. Our findings may also be applicable to other dynamic systems where
predictability is low.
Descrição
v. 5, p. 1235-1248, mar. 2015.
Palavras-chave
Altitude range, Comparative analysis, Environmental filtering, Insects, Latitude, Spatial extent, Variance partitioning
Citação
HEINO, Jani; MELO, Adriano S.; BINI, Luis Mauricio; ALTERMATT, Florian; AL-SHAMI, Salman A.; ANGELER, David G.; BONADA, Núria; BRAND, Cecilia; CALLISTO, Marcos; COTTENIE, Karl; DANGLES, Olivier; DUDGEON, David; ENCALADA, Andrea; GÖTHE, Emma; GRÖNROOS, Mira; HAMADA, Neusa; JACOBSEN, Dean; LANDEIRO, Victor L.; LIGEIRO, Raphael; MARTINS, Renato T.; MISERENDINO, María Laura; MD RAWI, Che Salmah; RODRIGUES, Marciel E.; ROQUE, Fabio de Oliveira; SANDIN, Leonard; SCHMERA, Denes; SGARBI, Luciano F.; SIMAIKA, John P.; SIQUEIRA, Tadeu; THOMPSON, Ross M.; TOWNSEND, Colin R. A comparative analysis reveals weak relationships between ecological factors and beta diversity of stream insect metacommunities at two spatial levels. Ecology and Evolution, v. 5, p. 1235-1248, Mar. 2015. Disponível em: <http://onlinelibrary.wiley.com/doi/10.1002/ece3.1439/epdf>.