Artículos de revistas
A comparative analysis reveals weak relationships between ecological factors and beta diversity of stream insect metacommunities at two spatial levels
Fecha
2015-03-01Registro en:
Ecology And Evolution. Hoboken: Wiley-blackwell, v. 5, n. 6, p. 1235-1248, 2015.
2045-7758
10.1002/ece3.1439
WOS:000351458500010
WOS000351458500010.pdf
Autor
Finnish Environm Inst
Universidade Federal de Goiás (UFG)
Eawag Swiss Fed Inst Aquat Sci &Technol
Univ Zurich
Sch Biol Sci
Univ Tabuk
Swedish Univ Agr Sci
Univ Barcelona
LIESA CONICET Univ Nacl Patagonia SJB
Universidade Federal de Minas Gerais (UFMG)
Univ Guelph
Pontif Cathol Univ Ecuador
Inst Rech Developpement
Univ Hong Kong
Laboratorio Ecologia Acuat Colegio Ciencias Biolo
Aarhus Univ
Inst Nacl de Pesquisas da Amazonia
Univ Copenhagen
Universidade Federal de Mato Grosso do Sul (UFMS)
Univ Basel
Hungarian Acad Sci
Univ Stellenbosch
Universidade Estadual Paulista (Unesp)
Univ Canberra
Univ Otago
Institución
Resumen
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.