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8 results for “community reassembly”
Data from: The effects of native seed mix composition and sowing density on plant community reassembly in wetlands
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Data to replicate: Forecasting community reassembly using climate-linked spatio-temporal ecosystem models
Ecosystems are increasingly impacted by human activities, altering linkages among physical and biological components. Spatial community reassembly occurs when these human impacts modify the spatial overlap between system components, and there is need for practical tools to forecast spatial community reassembly at landscape scales using monitoring data. To illustrate a new approach, we extend a generalization of empirical orthogonal function (EOF) analysis, which involves a spatio-temporal ecosystem model that approximates coupled physical, biological, and human dynamics. We then demonstrate its application to five trophic levels for the eastern Bering Sea by fitting to multiple, spatially unbalanced datasets measuring physical characteristics (temperature measurements and climate-linked forecasts), primary producers (spring and fall size-fractionated chlorophyll-a), secondary producers (copepods), juveniles (age-0 walleye pollock), adult consumers (five commercially important fishes), human activities (seasonal fishing effort), and mobile predators (seabirds). We identify the spatial niche for each ecosystem component, as well as dominant modes of variability that are highly correlated with a known bottom-up driver of dynamics. We then measure spatial overlap between interacting variables (using Schoener's-D) and identify that age-0 pollock have decreased spatial overlap with copepods and increased overlap with adult pollock during warm years, and also that adult pollock have increased overlap with arrowtooth flounder and decreased overlap with catcher-processor fishing effort during these warm years. Given the warming conditions that are projected for the coming decade, the model forecasts increased prey and competitor overlap involving adult pollock (between age-0 pollock, adult pollock and arrowtooth flounder) and decreased overlap with the copepod forage base and with the catcher-processor fishery during future warming. We recommend that joint species distribution models be extended to incorporate "ecological teleconnections" (correlations between distant locations arising from known mechanisms) arising from behavioral adaptation by mobile animals as well as passive advection of nutrients and planktonic juvenile stages.
Timing of invasive species removal influences nonnative biotic resistance and trajectories of community reassembly
<p><span>As biological invasions increasingly threaten biodiversity, the removal of invasive nonnative species emerges as a possibility to recover the structure and function of native communities. Yet, we have limited knowledge of how communities assemble after nonnative removals. Since most ecosystems are invaded by multiple nonnative species, the impact of their removal likely depends on the interactions among nonnative species which, in turn, are contingent on the environmental context in which they occur. </span></p> <p><span>We evaluated the community assembly after the targeted removal of two highly invasive shrubs, Sweetbriar rose (<em>Rosa</em> <em>rubiginosa</em>) and Scotch broom (<em>Cytisus</em> <em>scoparius</em>). The removal was performed at two different times in the growing season (early or late removal) in field and mesocosm communities. In search of general patterns across species, we modeled species responses as a function of their origin (i.e., native / nonnative) and functional traits. </span></p> <p><span>We found evidence for negative and asymmetric interactions between dominant invasive species that translated into changes in the abundances of the rest of the species in the community. Depending on the identity of the removed species, the removal of invasive species affected community assembly by promoting other nonnative species or hindering the performance of native species. These effects were modulated by the timing of removal and did not depend on leaf or seed traits.</span></p> <p><span><em>Synthesis</em>: Accounting for nonnative interactions and their temporal dependency should </span><span>improve our inferences about assembly processes and the effectiveness of nonnative </span><span>removal </span><span>aimed at reduci</span><span>ng the accumulation of nonnatives.</span><span> <br></span></p>
Inverse priority effects: The order and timing of removal of invasive species influence community reassembly
<p>1. An ongoing restoration challenge is to recover native communities after the removal of invasive species. Because priority effects (i.e., the order and timing of species arrival) can strongly determine the trajectory of community assembly, their intentional manipulation is gaining attention to manage invasive plants and achieve restoration goals. Yet, ecologists and conservationists rarely consider how the order and timing of species removal inverse priority effect may impact future plant communities. 2. Here, we evaluated the dependence of community reassembly on inverse priority effects by experimentally removing the target invasives Sweetbriar rose (<em>Rosa rubiginosa</em>) and Scotch broom (<em>Cytisus scoparius</em>) in field and mesocosm communities. We manipulated removal order (rose-before-broom vs. broom-before-rose) and timing (simultaneously early vs. simultaneously late in the season). We performed a Hierarchical Modeling of Species Community to assess differences in community structure in response to order and timing of removal, and to evaluate whether species origin and leaf and seed traits were associated with species responses. 3. We found that the order of removal was as important as timing driving community reassembly. Simultaneous removal favoured nonnatives, more so when performed early. Sequential removals led to contrasting communities. Rose-before-broom removal also favoured nonnative grasses at expense of native species, whereas the inverse order produced small changes in communities. In general, species with high specific leaf area were boosted, regardless of their seed size. 4. Synthesis and applications. Inverse priority effects are neglected mechanisms that can drive variability in the reassembly of plant communities and can potentially upgrade invasive species management. These historical contingencies suggest the existence of an optimal order of removal that facilitates the recovery of the native community. We found that simultaneous removal promoted secondary invasions to a greater extent than sequential removals. Furthermore, removal order affected post-removal community structure. In our system, we suggest removing the rose before the broom to hinder nonnatives and pave the way for restoration of native communities. Our results show that manipulation of the order and timing of removal can help to achieve restoration goals.</p>
Inverse priority effects: The order and timing of removal of invasive species influence community reassembly
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Data to replicate: Forecasting community reassembly using climate-linked spatio-temporal ecosystem models
Open the record for dataset details and reuse information.
Timing of invasive species removal influences nonnative biotic resistance and trajectories of community reassembly
Open the record for dataset details and reuse information.
Data from: Past tree influence and prescribed fire mediate biotic interactions and community reassembly in a grassland-restoration experiment
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Allen Brain Atlas
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DANDI Archive for NWB datasets
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International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.