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Title: A comparative analysis reveals weak relationships between ecological factors and beta diversity of stream insect metacommunities at two spatial levels
Authors: Heino, Jani
Melo, Adriano Sanches
Bini, Luis Mauricio
Altermatt, Florian
Al-Shami, Salman Abdo
Angeler, David G.
Bonada, Núria
Brand, Cecilia
Callisto, Marcos
Cottenie, Karl
Dangles, Olivier J.
Dudgeon, David
Encalada, Andrea C.
Göthe, Emma
Grönroos, Mira
Hamada, Neusa
Jacobsen, Dean
Landeiro, Victor Lemes
Ligeiro, Raphael
Martins, Renato Tavares
Miserendino, María Laura
Md Rawi, Che Salmah
Rodrigues, Marciel Elio
Roque, Fabio O.
Sandin, Leonard
Schmera, Dénes
Sgarbi, Luciano F.
Simaika, John P.
Siqueira, Tadeu
Thompson, Ross M.
Townsend, Colin R.
Keywords: Hexapoda
Issue Date: 2015
metadata.dc.publisher.journal: Ecology and Evolution
metadata.dc.relation.ispartof: Volume 5, Número 6, Pags. 1235-1248
Abstract: 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 dissimilarity-based 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. Beta diversity should vary along major ecological gradients. We used data for 95 stream insect metacommunities to examine if beta diversity showed general patterns over the world. We did not find clear patterns along latitudinal, altitudinal or environmental gradients, suggesting that stochasticity typical of frequently-disturbed stream ecosystems may hinder finding clear patterns in stream insect beta diversity. © 2015 Published by John Wiley & Sons Ltd.
metadata.dc.identifier.doi: 10.1002/ece3.1439
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