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325 results for “community response”
Data and code from: Traits and phylogenies modulate the environmental responses of wood-inhabiting fungal communities across spatial scales
<p>Identifying the spatial scales at which community assembly processes operate is fundamental for gaining a mechanistic understanding of the drivers shaping ecological communities. In this study, we examined whether and how traits and phylogenetic relationships structure fungal community assembly across spatial scales.</p> <p>We applied joint species distribution modelling to a European-scale dataset on 215 wood-inhabiting fungal species, which includes data on traits, phylogeny and environmental variables measured at the local (log-level) and regional (site-level) scales.</p> <p>At the local scale, wood-inhabiting fungal communities were mostly structured by deadwood decay stage, and the trait and phylogenetic patterns along this environmental gradient suggested the lack of diversifying selection.</p> <p>At regional scales, fungal communities and their trait distributions were influenced by climatic and connectivity-related variables. The fungal climatic niches were not phylogenetically structured, suggesting that diversifying selection or stabilizing selection for climatic niches has played a strong role in wood-inhabiting communities. In contrast, we found a strong phylogenetic signal in the responses to connectivity-related variables, revealing phylogenetic homogenization in small and isolated forests.</p> <p>Altogether, our results show that species-level traits and phylogenies modulate the responses of wood-inhabiting fungi to environmental processes acting at different scales. This result suggests that the evolutionary histories of fungal traits diverge along different environmental axes.</p>
Data from: Price equations for understanding the response of ecosystem function to community change
<p>Biodiversity-ecosystem function research in natural ecosystems would benefit from new theoretical and analytical tools that match common characteristics of observational community data. To this end, we developed a novel, abundance-based version of the ecological Price equation in both discrete and continuous forms. As part of the presentation of this new method, we conducted two demonstration analyses.</p> <p>The first analysis focuses on pollination of watermelon by wild bees. We net-collected wild pollinator specimens from standard areas of flowering watermelon crop at 16 replicated farms in 2012. We also measured how many pollen grains each bee species deposited per visit. These per-visit pollen deposition rates were estimated as a genus-level property, as is common for landscape pollination studies. To determine total pollination for each bee species at each site, we multiplied pollinator visitation rates and per-visit pollen deposition. The attached data includes site by species matrices for the abundance (watermelon_com.csv) and per-capita pollen deposition (watermelon_fun.csv) of bee species.</p> <p>The second analysis focuses on changes in total community biomass of stream invertebrates collected from 25 sites along a strong, continuous pollution gradient. These data were previously published by Pomeranz et al. (2019), accessible at the Dryad link given below. Specimens were individually measured and assigned to one of six functional groups. Finer taxonomic resolution is available in the original study, but we use functional groups here to get enough data to effectively model. The attached data includes site by functional group matrices for the abundance (stream_inverts.csv) and per-capita biomass (stream_invert_size.csv) of stream invertebrate functional groups, and a third .csv which describes the level of pollution at each site (steam_data.csv).</p> <p>The code is a single R code file which produces the results and figures found in the manuscript. We have also included a README and several .csv files (those described above) that need to be read in.</p> <p>These data may be useful for other analyses of variation in ecosystem function across sites. We stress that the stream invertebrate data were collected by Pomeranz et al. (2019) and they should be cited for any use those data. The relevant link to access their data is: https://datadryad.org/stash/dataset/doi:10.5061/dryad.v6g985s</p>
Predicted alteration of vertebrate communities in response to climate-induced elevational shifts
<p><strong>Aim</strong></p> <p>Climate change is driving species to migrate to novel areas as current environments become unsuitable. As a result, species distributions have shifted uphill in montane ecosystems globally, leading to projections of severe impacts on upland specialist species. Heterogenous dispersal rate among shifting species could result in complex changes to community assemblages. For example, interspecific differences in dispersal ability could lead to the disruption, or creation, of species interactions and processes within communities, likely amplifying the impact of climate change on ecosystems. Here, we provide a comprehensive assessment of the impacts of climate change on communities and ecosystems by developing a novel spatially explicit approach focussing on changes in local populations.</p> <p><strong>Location</strong></p> <p>The Australian Wet Tropics.</p> <p><strong>Method</strong></p> <p>We used a spatially explicit approach to simulate the elevational shift of 7,613 community assemblages (defined at the patch level) along the elevational gradient, using empirical information about the distribution of 202 vertebrate species. We analysed changes in community structures and species co-occurrence derived from the elevational shift as a proxy for potential changes in species interactions.</p> <p><strong>Results</strong></p> <p>Our results showed a consistent pattern of increasing temporal β-dissimilarity between community assemblages along the elevational gradient resulting from local species extinctions. The local extinction rate was especially remarkable at high elevations, suggesting potential mass local extinctions of upland species unable to shift to the isolated mountaintops. Furthermore, the increasing local extinction rate with elevation resulted in a marked decline in species co-occurrence towards mountaintops.</p> <p><strong>Main conclusions</strong></p> <p>Our study highlights the escalating impact of climate change on community assemblages in response to climate-induced elevational shifts in species' ranges, providing a classic example of the "escalator to extinction". Future predictions of the impacts of climate change on ecosystems will benefit from improvements in understanding species interactions and species potential to adapt to a changing environment.</p>
Intra- and interspecific variability of specific leaf area mitigate the reduction of community stability in response to warming and nitrogen addition
<p><span>Global environmental changes are reducing the diversity and affecting the functioning of natural ecosystems as well as their ability to reliably provide ecosystem functions and services to mankind. Many studies have shown that a greater plant diversity can stabilize community productivity against environmental fluctuations. However, most of these studies focused on plant species richness, thus overlooking the potential role of functional traits in stabilizing community productivity against environmental fluctuations.</span> <span>Whether and how functional trait mean and variability influence community stability in response to environmental changes and their relative contributions to community stability are largely unknown. Here, we used a 10-year experiment to investigate the role of species richness, as well as functional mean and intra- and interspecific variability of specific leaf area (SLA) of plants within- and among communities in driving community stability in response to nitrogen (N) addition and warming.</span> <span>We found that both N addition and warming reduced the temporal stability of community productivity by reducing species richness and its contribution to species asynchrony and species stability. In contrast, changes in the mean and variability of SLA in response to N addition and warming mitigated the reduction of community stability. Specifically, N addition reduced variation in SLA both by reducing interspecific differences in SLA within communities and differences in mean values of SLA among communities. Warming increased intraspecific differences in SLA among communities, leading to higher species stability that partly buffered the reduction of community stability.</span><span> Our study demonstrates the role of trait mean and variability in mitigating the reduction of community stability in response to two pervasive global environmental changes. Gaining a deeper understanding of the processes linking global changes and the stability of our ecosystems requires integrating both trait mean values and trait variability.</span></p>
Environmentally responsible behavior of community-based tourists in Santo Amaro, Brazil
<p>Data were collected in 2019, with tourists who consumed an alternative tourism experience in Santo Amaro (Maranhao state), Brazil. There were 227 participants. This database has not been processed and its language is Portuguese. </p>
Data from: Evidence for divergence in phenology over morphology in response to limiting similarity in montane communities of Rhododendron
<p>1. The coexistence of closely related species is key to understanding the nature of biodiversity hotspots where in situ diversification has yielded rich communities of close relatives. Limiting similarity predicts that co-occurring species are differentiated in their niches; identifying the axes of differentiation in sympatric close relatives can thus help reveal the eco-evolutionary dynamics of community assembly. For flowering plants, these axes may be temporal (related to reproductive phenology) or morphological (related to functional traits).</p> <p>2. We collected fine-scale data on abundance, morphology, and phenology over a flowering season for 34 species of <em>Rhododendron</em> (Ericaceae) spanning a 2700 m elevation gradient in a nature reserve in the eastern Hengduan Mountains, China. We used null models to test for patterns of clustering versus overdispersion in species' abundances, phylogenetic relatedness, and functional traits across sites, and applied joint distribution models to examine the correlates of pairwise associations.</p> <p>3. We found that species tended to be spatially aggregated, indicating that communities are not strongly structured by competitive exclusion. At higher elevation sites, species tended to be vegetatively more similar (clustered) and closely related. Environmental variables, including climate and topography, were strong predictors of species' ranges. No evidence of niche differentiation was detected along spatial or morphological (functional) axes, but along the temporal axis, the phenology of co-occurring species showed significant divergence, and was less phylogenetically conserved compared to morphological traits.</p> <p>4. <em>Synthesis</em>. Local communities of <em>Rhododendron</em> in its center of diversity are structured by environmental filtering and the effects of limiting similarity. Evidence for the latter is apparent in the pervasive phenological divergence of co-occurring species, likely driven by reproductive interference from shared pollinators. The evolutionary lability of flowering time appears to render it the quickest path to coexistence for recently diverged species that experience secondary contact in this biodiversity hotspot.</p>
Biological and biogeochemical responses of benthic communities to marine heatwaves - BioHeat
<p>The dataset presents data from a laboratory experiment exploring the effect of heatwaves of different intensities on benhic bioturbation, community excretion and biogeochemical cycling of solutes. <span>We tested the effects of short-term, moderate and strong marine heatwaves on macrofauna bioturbation and associated solute fluxes as examples of ecosystem functioning. We also measured macrofaunal excretion rates to assess effects of temperature on macrofauna metabolism. For this experiment, we used unmanipulated sediment cores with natural animal communities collected from a muddy location at 32 m depth in the northern Baltic Sea. Despite the mechanistic effect of bioturbation remaining unchanged between the treatments, there were significant differences in oxygen consumption, solute fluxes and excretion. Biogeochemical and biological processes were boosted by the moderate heatwave, whereas biogeochemical cycling seemed to decrease under a strong heatwave.</span></p>
Heatwave responses of Arctic phytoplankton communities are driven by combined impacts of warming and cooling
<p>Marine heatwaves are increasing in frequency and intensity as climate change progresses, especially in the highly productive Arctic regions. Although their effects on primary producers will largely determine the impacts on ecosystem services, mechanistic understanding on phytoplankton responses to such extreme events is still very limited. We experimentally exposed Arctic phytoplankton assemblages to stable warming, as well as to repeated heatwaves, and measured temporally resolved productivity, physiology and composition. Our results show that even extreme stable warming increases productivity, while the response to heatwaves depends on the specific scenario applied, and are not predictable from stable warming responses. This appears to be largely due to the underestimated impact of the cool phase following a heatwave, which can be at least as important as the warm phase for the overall response. We show that physiological and compositional adjustments to both, warm and cool phases drive overall phytoplankton productivity, and need to be considered mechanistically to predict overall ecosystem impacts.</p>
Response of soil fungal communities and their co-occurrence patterns to grazing exclusion in different grassland types
<p>Overgrazing and climate change are the main causes of grassland degradation, and grazing exclusion is one of the most common measures for restoring degraded grasslands worldwide. Soil fungi can respond rapidly to environmental stresses, but the response of different grassland types to grazing control has not been uniformly determined. Three grassland types (temperate desert, temperate steppe grassland, and mountain meadow) that were closed for grazing exclusion for nine years were used to study the effects of grazing exclusion on soil nutrients as well as fungal community structure in the three grassland types. The results showed that (1) in the 0–5 cm soil layer, grazing exclusion significantly affected the soil water content of the three grassland types (<em>P</em><0.05), and the pH, total phosphorous (TP) and nitrogen-to-phosphorous ratio (N/P) changed significantly in all three grassland types (<em>P</em><0.05). Significant changes in soil nutrients in the 5–10 cm soil layer after grazing exclusion occurred in the mountain meadow grasslands (<em>P</em><0.05), but not in the temperate desert and temperate steppe grasslands. (2) For the different grassland types, Archaeorhizomycetes was most abundant in the montane meadows, and Dothideomycetes was most abundant in the temperate desert grasslands and was significantly more abundant than in the remaining two grassland types (<em>P</em><0.05). Grazing exclusion let to insignificant changes in the dominant soil fungal phyla and in α diversity but significant changes in the β diversity of soil fungi (<em>P</em><0.05). (3) Grazing exclusion areas have higher mean clustering coefficients and modularity classes than grazing areas. In particular, the highest modularity class is found in temperate steppe grassland grazing exclusion areas. (4) We also found that pH is the main driving factor affecting soil fungal community structure, that plant coverage is a key environmental factor affecting soil community composition, and that grazing exclusion indirectly affects soil fungal communities by affecting soil nutrients. The above results suggest that grazing exclusion may regulate microbial ecological processes by changing the soil fungal β diversity in the three grassland types. Grazing exclusion is not conducive to the recovery of soil nutrients in areas with mountain meadow but improves the stability of soil fungi in temperate steppe grassland. Therefore, the type of degraded grassland should be considered when formulating suitable restoration programmes when grazing exclusion measures are implemented. The results of this study provide new insights into the response of soil fungal communities to grazing exclusion, providing a theoretical basis for the management of degraded grassland restoration.</p>
Harmful algae niche response(s) to environmental and community variation along the French coast. Dataset
<p>The data-set is composed of three tables, Environmental variables, Phytoplankton ( in log+1 abundance) and the coordinates of the station used in the study. They were made after the pre-processing*. See articles for more information.</p>
Data from: Plant community responses to long-term fertilization: changes in functional group abundance drive changes in species richness
Declines in species richness due to fertilization are typically rapid and associated with increases in aboveground production. However, in a long-term experiment examining the impacts of fertilization in an early successional community, we found it took 14 years for plant species richness to significantly decline in fertilized plots, despite fertilization causing a rapid increase in aboveground production. To determine what accounted for this lag in the species richness response, we examined several potential mechanisms. We found evidence suggesting the abundance of one functional group—tall species with long-distance (runner) clonality—drove changes in species richness, and we found little support for other mechanisms. Tall runner species initially increased in abundance due to fertilization, then declined dramatically and were not abundant again until later in the experiment, when species richness and the combined biomass of all other functional groups (non-tall runner) declined. Over 86 % of the species found throughout the course of our study are non-tall runner, and there is a strong negative relationship between non-tall runner and tall runner biomass. We therefore suggest that declines in species richness in the fertilized treatment are due to high tall runner abundance that decreases the abundance and richness of non-tall runner species. By identifying the functional group that drives declines in richness due to fertilization, our results help to elucidate how fertilization decreases plant richness and also suggest that declines in richness due to fertilization can be lessened by controlling the abundance of species with a tall runner growth form.
Data from: Non-linear responses of soil nematode community composition to increasing aridity
Aim: Increasing aridity under global change is predicted to have a profound impact on the structure and functioning of terrestrial ecosystems, yet we have poor understanding of how belowground communities respond. In order to understand the longer-term responses of different trophic levels in the soil food web to increasing aridity, we investigated the abundance, richness and community similarity of the soil nematode community along a 3200-km aridity gradient. Location: A transect across semi-arid and arid grasslands in Northern China, where the aridity ranges from 0.43 to 0.97. Time period: July and August 2012. Major taxa studied: Soil-borne Nematoda. Methods: We used Generalized Additive (Mixed) Models to analyze the abundance, richness and community similarity patterns of soil nematodes. We used Structural Equation Modelling (SEM) to disentangle the direct and indirect environmental drivers (aridity, soil and plant variables) of the nematode community. Results: The abundance, richness and similarity of nematode communities declined non-linearly with increasing aridity. The most pronounced decline in nematode richness and community similarity occurred under arid conditions (aridity > 0.80). However, the shape of response to aridity differed among nematode feeding groups. Under arid conditions, the abundance and richness of bacterial feeders were less sensitive to changes in aridity than fungal feeders. The SEM analysis revealed that nematode community responses to aridity were not mediated via changes in plant and soil variables, but rather were directly affected by aridity. Main conclusions: Our results show that in mesic grasslands increasing aridity primarily caused decline in nematode abundance, whereas increasing aridity in xeric grasslands led to loss of nematode diversity. The non-linear responses of nematodes to aridity could result in non-linear shifts in ecosystem functioning as well, because soil nematodes operate at various trophic levels in the soil food web, thereby influencing the performance of plants, soil biodiversity and biogeochemical cycling.
Data from: Spatial heterogeneity in species composition constrains plant community responses to herbivory and fertilization
Environmental change can result in substantial shifts in community composition. The associated immigration and extinction events are likely constrained by the spatial distribution of species. Still, studies on environmental change typically quantify biotic responses at single spatial (time series within a single plot) or temporal (spatial beta-diversity at single time points) scales, ignoring their potential interdependence. Here, we use data from a global network of grassland experiments to determine how turnover responses to two major forms of environmental change – fertilization and herbivore loss – are affected by species pool size and spatial compositional heterogeneity. Fertilization led to higher rates of local extinction whereas turnover in herbivore exclusion plots was driven by species replacement. Overall, sites with more spatially heterogeneous composition showed significantly higher rates of annual turnover, independent of species pool size and treatment. Taking into account spatial biodiversity aspects will therefore improve our understanding of consequences of global and anthropogenic change on community dynamics.
Resources do not limit compensatory response of a tallgrass prairie plant community to the loss of a dominant species
<p>The effect of species loss on ecosystem productivity is determined by both the functional contribution of the species lost, and the response of the remaining species in the community. According to the mass-ratio hypothesis, the loss of a dominant plant species, which has a larger proportionate contribution to productivity, is expected to exert an overwhelming effect on this important ecosystem function. However, via competitive release, loss of a dominant species can provide the opportunity for other plant species to establish, thrive and become abundant in the community, potentially compensating for the function lost. Furthermore, if resource limitation is removed, then compensatory response of function to the loss of a dominant species should be greater and more rapid than if resources are more limiting.</p> <p>To evaluate how resources may limit compensation of aboveground productivity to the loss of a dominant plant species, we experimentally removed the C<sub>4</sub> perennial tallgrass, <em>Andropogon gerardii</em>, from intact plant communities. We added water for four years, as well as nitrogen in the fourth year, to test the effect of resource limitation on the compensatory response.</p> <p>Overall, aboveground biomass production increased in the remaining community with both water and nitrogen addition. However, this increase in biomass production was not sufficient to fully compensate for the loss of A. gerardii, indicating water and nitrogen were not limiting short-term compensation in this community.</p> <p>Following the removal of the dominant species, there was a reordering of species abundances in the community, rather than changes in species richness. The C<sub>4</sub> grass <em>Bouteloua curtipendula</em> was the most responsive species, increasing by 57.9% in abundance with water addition and 91.0% with both water and nitrogen addition. Despite this dramatic increase in abundance, its short stature and lower per capita biomass production prevented this species from compensating for the loss of <em>A. gerardii</em>.</p> <p>Our results suggest that short-term compensation after the loss of a dominant plant species can be hastened by increased resource availability, but ultimately full compensation appears to be limited by the presence and abundance of species in the remaining community that possess traits that allow them compensate for the species lost.</p>
Data for: Latent functional diversity may accelerate microbial community responses to temperature fluctuations
<p>How complex microbial communities respond to climatic fluctuations remains an open question. Due to their relatively short generation times and high functional diversity, microbial populations harbor great potential to respond as a community through a combination of strain-level phenotypic plasticity, adaptation, and species sorting. However, the relative importance of these mechanisms remains unclear. We conducted a laboratory experiment to investigate the degree to which bacterial communities can respond to changes in environmental temperature through a combination of phenotypic plasticity and species sorting alone. We grew replicate soil communities from a single location at six temperatures between 4°C and 50°C. We found that phylogenetically- and functionally-distinct communities emerge at each of these temperatures, with <em>K</em>-strategist taxa favoured under cooler conditions, and <em>r</em>-strategist taxa under warmer conditions. We show that this dynamic emergence of distinct communities across a wide range of temperatures (in essence, community-level adaptation), is driven by the resuscitation of latent functional diversity: the parent community harbors multiple strains pre-adapted to different temperatures that are able to "switch on" at their preferred temperature without immigration or adaptation. Our findings suggest that microbial community function in nature is likely to respond rapidly to climatic temperature fluctuations through shifts in species composition by resuscitation of latent functional diversity.</p>
Tundra soil viruses mediate the responses of microbial communities to climate warming
<p>The dataset of this study contains the information of metagenomic data, environmental factors, GeoChip data, vOTUs table, mOTUs tables, and the viral and microbial sequences.</p> <p>If this study dataset is useful, please cite: Ji M, et al. Tundra Soil Viruses Mediate Responses of Microbial Communities to Climate Warming[J]. Mbio, 2023: e03009-22.</p> <p>For any other dataset/analysis inquiries, please contact me: jimengzhi@mail.sdu.edu.cn.</p>
Long-term responses to large-scale disturbances: Spatiotemporal variation in gastropod populations and communities
<p>The Anthropocene is characterized by complex, primarily human-generated, disturbance regimes that include combinations of long-term press (e.g. climate change, pollution) and episodic pulse (e.g. cyclonic storms, floods, wildfires, land use change) disturbances. Within any regime, disturbances occur at multiple spatial and temporal scales, creating complex and varied interactions that influence spatiotemporal dynamics in the abundance, distribution, and biodiversity of organisms. Moreover, responses to disturbance are context-dependent, with the legacies of previous disturbances affecting responses to ensuing perturbations. We use three decades of annual data to evaluate the effects of repeated pulse disturbances and global warming on gastropod populations and communities in Puerto Rico at multiple spatial scales. More specifically, we quantify (1) the relative importance of large-scale and small-scale aspects of disturbance on variation in abundance, biodiversity, and species composition; and (2) the spatial scales at which populations and communities integrate information in the spatially heterogenous environments created by disturbances. Gastropods do not exhibit consistent decreases in abundance or biodiversity in association with global warming: abundance for many species has increased over time and species richness does not evince a temporal trend. Nonetheless, gastropods are sensitive to hurricane severity, spatial environmental variation, and successional trajectories of the flora. In addition, they exhibit context-dependent (i.e. legacy effects) responses that are scale-dependent. The Puerto Rican biota has evolved in a disturbance-mediated system. This historical exposure to repeated, severe hurricane-induced disturbances has imbued the biota with high resistance and resilience to the current disturbance regime, resulting in an ability to persist or thrive under current environmental conditions. Nonetheless, these ecosystems may yet be threatened by worsening direct and indirect effects of climate change. In particular, more frequent and severe hurricanes may prevent the establishment of closed-canopy forests, negatively impacting populations and communities that rely on these habitats.</p>
Data for: Antibiotic-degrading resistance changes bacterial community structure via species-specific responses
<p>Some bacterial resistance mechanisms degrade antibiotics, potentially protecting neighbouring susceptible cells from antibiotic exposure. We do not yet understand how such effects influence bacterial communities of more than two species, which are typical in nature. Here, we used experimental multispecies communities to test the effects of clinically important pOXA-48-plasmid-encoded resistance on community-level responses to antibiotics. We found that resistance in one community member reduced antibiotic inhibition of other species, but some benefitted more than others. Further experiments with supernatants and pure-culture growth assays showed the susceptible species profiting most from detoxification were those that grew best at degraded antibiotic concentrations (greater than zero, but lower than the starting concentration). This pattern was also observed on agar surfaces, and the same species also showed relatively high survival compared to most other species during the initial high-antibiotic phase. By contrast, we found no evidence of a role for higher-order interactions or horizontal plasmid transfer in community-level responses to detoxification in our experimental communities. Our findings suggest carriage of an antibiotic-degrading resistance mechanism by one species can drastically alter community-level responses to antibiotics, and the identities of the species that profit most from antibiotic detoxification are predicted by their intrinsic ability to survive and grow at changing antibiotic concentrations.</p>
Response and resilience of karst subterranean estuary communities to precipitation impacts
<p>Data and code used in the analyses for the article "Response and resilience of karst subterranean estuary communities to precipitation impacts" published in the journal "Ecology and Evolution" in 2023. See Metadata file for the description on each file.</p>
Opioid Rapid Response System: Naloxone Training in Communities
ClinicalTrials.gov study NCT06238128. IPD Sharing: YES. Countries: 1. Publications: 1.
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Allen Brain Atlas
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Annotated Behaviour and Observability Dataset (ABODe)
ABODe is a University of Edinburgh DataShare dataset for behavior classification in group-housed mice using home-cage video, identities, bounding boxes, ground-plate positions, and annotator labels.
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