Spatial scale modulates the inference of metacommunity assembly processes

The abundance and distribution of species across the landscape depend on the interaction between local, spatial, and stochastic processes. However, empirical syntheses relating these processes to spatiotemporal patterns of structure in metacommunities remain elusive. One important reason for this la...

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Vydáno v:Ecology (Durham) Ročník 100; číslo 2; s. 1 - 9
Hlavní autoři: Viana, Duarte S., Chase, Jonathan M.
Médium: Journal Article
Jazyk:angličtina
Vydáno: United States John Wiley and Sons, Inc 01.02.2019
Ecological Society of America
Témata:
Assembly
biodiversity
Communities
community assembly
CONCEPTS & SYNTHESIS: EMPHASIZING NEW IDEAS TO STIMULATE RESEARCH IN ECOLOGY
Dispersal
Dispersion
Drift
ecological drift
ecosystems
empirical research
Grain
Heterogeneity
landscapes
Mapping
metacommunity
Microprocessors
neutral theory
Niche breadth
niche selection
sampling grain
Scaling
Spatial distribution
spatial extent
spatial scale
Stochastic processes
Variation
spatial extent
niche selection
sampling grain
dispersal
spatial scale
ecological drift
neutral theory
community assembly
metacommunity
ISSN:0012-9658, 1939-9170
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Shrnutí:The abundance and distribution of species across the landscape depend on the interaction between local, spatial, and stochastic processes. However, empirical syntheses relating these processes to spatiotemporal patterns of structure in metacommunities remain elusive. One important reason for this lack of synthesis is that the relative importance of the core assembly processes (dispersal, selection, and drift) critically depends on the spatial grain and extent over which communities are studied. To illustrate this, we simulated different aspects of community assembly on heterogeneous landscapes, including the strength of response to environmental heterogeneity (inherent to niche theory) vs. dispersal and stochastic drift (inherent to neutral theory). We show that increasing spatial extent leads to increasing importance of niche selection, whereas increasing spatial grain leads to decreasing importance of niche selection. The strength of these scaling effects depended on environment configuration, dispersal capacity, and niche breadth. By mapping the variation observed from the scaling effects in simulations, we could recreate the entire range of variation observed within and among empirical studies. This means that variation in the relative importance of assembly processes among empirical studies is largely scale dependent and cannot be directly compared. The scaling coefficient of the relative contribution of assembly processes, however, can be interpreted as a scale-integrative estimate to compare assembly processes across different regions and ecosystems. This emphasizes the necessity to consider spatial scaling as an explicit component of studies intended to infer the importance of community assembly processes.
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ISSN:0012-9658
1939-9170
DOI:10.1002/ecy.2576