Community size can affect the signals of ecological drift and niche selection on biodiversity

Siqueira, Tadeu; Saito, Victor S.; Bini, Luis Maurício; Melo, Adriano S.; Petsch, Danielle Katharine; Landeiro, Victor Lemes; Tolonen, Kimmo; Jyrkänkallio‐Mikkola, Jenny; Soininen, Janne; Heino, Jani

doi:10.1002/ecy.3014

Cited by 71 publications

(83 citation statements)

References 56 publications

(103 reference statements)

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“…In the past decade, dispersal has become a pivotal process to consider in community ecology, particularly in fragmented ecosystems (Altermatt & Fronhofer, 2018; Datry, Bonada, et al, 2016; Heino et al., 2017; Siqueira et al, 2020). However, dispersal is also one of the most difficult processes to study in nature even for a single individual or a single species, which is clearly exacerbated when considering dozens to hundreds of species in a metacommunity (Heino et al., 2017).…”

Section: Discussionmentioning

confidence: 99%

“…Alp, Keller, Westram, & Robinson, 2012; Cañedo‐Argüelles et al., 2015; Keleher & Rader, 2008). Dispersal limitation can also originate from the intrinsic dispersal abilities and modes of organisms (Sarremejane, Stubbington, Dunbar, Westwood, & England, 2019; Siqueira et al, 2020; Tonkin, Altermatt, et al, 2018). For example, two species with contrasted dispersal abilities can exhibit very different patterns within the same ecosystem, reflecting their relative ability to reach all localities within a given landscape (Rader, Unmack, Christensen, & Jiang, 2019).…”

Section: Introductionmentioning

confidence: 99%

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Fragmentation promotes the role of dispersal in determining 10 intermittent headwater stream metacommunities

et al. 2020

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Dispersal, defined as the movement of individuals among local communities in a landscape, is a central regional determinant of metacommunity dynamics in ecosystems. Whereas both natural and anthropogenic ecosystem fragmentations can limit dispersal, previous attempts to measure such limitations have faced considerable context dependency, due to a combination of spatial extent and associated environmental variability, the wide range of dispersal modes, and abilities of organisms or variation in network topologies. Therefore, the role dispersal plays compared to local environmental filtering in explaining metacommunity dynamics remains unclear in fragmented dendritic ecosystems. We quantified α‐ and β‐diversity components of invertebrate metacommunities across 10 fragmented headwater stream networks and tested the hypothesis that dispersal is the primary determinant of biodiversity organisation in these dynamic and spatially constrained ecosystems. Alpha‐diversity was much lower in intermittent than perennial reaches, even long after rewetting, indicating an overwhelming effect of drying including a legacy effect on local communities. Beta‐diversity was never correlated with environmental distances but predominantly explained by spatial distances accounting for river network fragmentation. The nestedness proportion of β‐diversity was considerable and reflected compositional differences where communities from intermittent reaches were subsets of perennial reaches. Altogether, these results indicate dispersal as the primary process shaping metacommunity dynamics in these 10 headwater stream networks, where local communities recurrently undergo extinction and recolonisation events. This challenges previous conceptual views that local environment filtering is the main driver of headwater stream metacommunities. As river networks become increasingly fragmented due to global change, our results suggest that some freshwater ecosystems currently driven by local environment filtering could gradually become dispersal‐limited. In this perspective, shifts from perennial to intermittent flow regimes represent ecological thresholds that should not be crossed to avoid jeopardising river biodiversity, functional integrity, and the ecosystem services they provide to society.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Fragmentation promotes the role of dispersal in determining 10 intermittent headwater stream metacommunities

et al. 2020

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“…Moreover, the relative abundance of archaea was much lower than bacteria here. The random birth and death may more strongly influence the communities with the smaller population size, thus leading to increased relative importance of drift (Siqueira et al., 2020; Wu et al., 2018). The stronger relative importance of undominated processes (primarily drift) in shaping archaeal communities than bacterial communities suggests that the lower relative abundance may also contribute to the stochastic assembly of archaea.…”

Section: Discussionmentioning

confidence: 99%

Community assembly of bacteria and archaea in coastal waters governed by contrasting mechanisms: A seasonal perspective

et al. 2020

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Marine planktonic bacteria and archaea commonly exhibit pronounced seasonal succession in community composition. But the existence of seasonality in their assembly processes and between-domain differences in underlying mechanism are largely unassessed. Using a high-coverage sampling strategy (including single sample for each station during four cruises in different seasons), 16S rRNA gene sequencing, and null models, we investigated seasonal patterns in the processes governing spatial turnover of bacteria and archaea in surface coastal waters across a sampling grid over ~300 km in the East China Sea. We found that archaea only bloomed in prokaryotic communities during autumn and winter cruises. Seasonality mostly overwhelmed spatial variability in the compositions of both domains. Bacterial and archaeal communities were dominantly governed by deterministic and stochastic assembly processes, respectively, in autumn cruise, probably due to the differences in niche breadths (bacteria < archaea) and relative abundance (bacteria > archaea). Stochasticity dominated assembly mechanisms of both domains but was driven by distinct processes in winter cruise. Determinism-dominated assembly mechanisms of bacteria rebounded in spring and summer cruises, reflecting seasonal variability in bacterial community assembly. This could be attributed to seasonal changes in bacterial niche breadths and habitat heterogeneity across the study area. There were seasonal changes in environmental factors mediating the determinism-stochasticity balance of bacterial community assembly, holding a probability of the existence of unmeasured mediators. Our results suggest contrasting assembly mechanisms of bacteria and archaea in terms of determinism-vs.-stochasticity pattern and its seasonality, highlighting the importance of seasonal perspective on microbial community assembly in marine ecosystems.

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“…Furthermore, in less predictable systems, species are expected to have life strategies that are not related to seasonality, being mostly generalists adapted to highly dynamic systems (McMullen & Lytle, 2012; Tonkin et al., 2017). In this sense, we expected that the temporal β diversity of Atlantic Forest coastal streams would be weakly influenced by deterministic environmental filtering related to climatic variation, which in turn could enhance the relative importance of stochastic and spatial processes, such as random variation in demography and dispersal events (Siqueira et al., 2020).…”

Section: Introductionmentioning

confidence: 99%

Stochastic colonisation dynamics can be a major driver of temporal β diversity in Atlantic Forest coastal stream communities

et al. 2021

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1. Biodiversity is structured in space and time, yet our understanding about the temporal variation of biological communities is still limited. Recent work suggests that temporal β diversity should be lowest in unpredictable systems with low seasonality, as expected for tropical ecosystems. However, this hypothesis remains largely unexplored.2. Here, we analysed the temporal dynamics of Atlantic Forest coastal stream caddisfly assemblages sampled simultaneously along four years, resulting in 99 unique site-time combinations. Given that the region we studied is expected to have low climatic seasonality and low environmental harshness, we expected to find: (1) unseasonal variation in community composition; (2) equal contribution of nestedness and turnover to β diversity; (3) weak correlation between variation in community composition and in environmental variables; and (4) temporal β diversity similar to that expected by neutral dynamics.3. Using wavelet analysis we found that, in spite of general temperature stability, precipitation was highly seasonal but unpredictable at the monthly scale. We found high temporal β diversity, with a larger contribution of nestedness due to an overall decrease in abundance and diversity during months characterised by heavy rain events. We also found that community composition was moderately structured in space, suggesting that both local in-stream characteristics and dispersal limitation drive community reassembly after heavy rain events. 4. Null model analysis indicated that observed short-term β diversity was not distinct from that expected by chance (i.e. produced by null simulations). This suggests an important role of stochastic colonisation and dispersal limitation in the temporal organisation of Atlantic Forest stream assemblages. 5. Since heavy rain events strongly disassemble communities that are then randomly recolonised, and considering the current scenario of climate change, increased extreme events of precipitation could lead to unpredictable changes in biodiversity in tropical regions.

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Community size can affect the signals of ecological drift and niche selection on biodiversity

Abstract: 2020. Community size can affect the signals of ecological drift and niche selection on biodiversity. Ecology 101(6):

Cited by 71 publications

References 56 publications

Fragmentation promotes the role of dispersal in determining 10 intermittent headwater stream metacommunities

Fragmentation promotes the role of dispersal in determining 10 intermittent headwater stream metacommunities

Community assembly of bacteria and archaea in coastal waters governed by contrasting mechanisms: A seasonal perspective

Stochastic colonisation dynamics can be a major driver of temporal β diversity in Atlantic Forest coastal stream communities

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