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36 results for “Resilience and Resistance”
Predicting resistance to amyloid-beta deposition and cognitive resilience in the oldest-old
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Vegetation resistance and resilience to a decade-long dry period in the temperate grasslands in China
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Data from: The role of transcriptome resilience in resistance of corals to bleaching
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Monitoring resistance and resilience using carbon trajectories: analysis of forest management-disturbance interactions
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Measuring resilience and resistance in aging and Alzheimer disease using residual methods: A systematic review and meta-analysis
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Data from: Symbiotic soil fungi enhance resistance and resilience of an experimental grassland to drought and nitrogen deposition
<ol> <li><span><a name="_Hlk39447697"> Ecosystem stability is threatened by multiple global change factors</a> such as drought and elevated nitrogen deposition. Yet, it is still poorly understood whether soil organisms can buffer against such perturbations. Here we focus on arbuscular mycorrhizal fungi (AMF), a common and widespread group of soil fungi. AMF form symbiotic associations with the majority of terrestrial land plants and promote a range of ecosystem services including plant production, diversity and nutrient cycling. </span></li> <li><span>We tested whether AMF have the ability to enhance the resistance and resilience of plant communities under soil moisture deficit (hereby drought) and nitrogen deposition. Grassland microcosms with 11 different plant species were established with and without AMF and exposed to elevated nitrogen levels and to an intermittent period of drought.</span></li> <li><span>Drought strongly reduced plant productivity and nitrogen cycling, but had limited effects on plant diversity. Nitrogen enrichment reduced plant diversity and increased nitrogen leaching and N<sub>2</sub>O emissions. The presence of AMF enhanced plant productivity, plant diversity, and reduced nitrogen losses. AMF facilitated the resistance of plant productivity and nitrogen cycling to drought and the recovery of the plant community structure back to its pre drought state. Furthermore, AMF also mitigated the adverse effects of nitrogen enrichment on the resistance of multiple ecosystem functions to drought.</span></li> <li><span><i>Synthesis.</i> Our work highlights the integral role of AMF for the stability of ecosystem functioning; AMF are not only able to promote resistance to harsh conditions of global change, but also improve resilience by enabling <span>plant communities to recover. These findings underline</span> AMF's insurance capacity to buffer ecosystems against global change.</span></li> </ol>
Local and regional drivers influence how aquatic community diversity, resistance and resilience vary in response to drying
<p>Disturbance events govern how the biodiversity of ecological communities varies in both space and time. In freshwater ecosystems, there is evidence that local and regional-scale drivers interact to influence ecological responses to drying disturbances. However, most research provides temporal snapshots at the local scale, whereas few studies encompass a gradient of drying severity spanning multiple years. Using a dataset of rare spatiotemporal extent and detail, we demonstrate how independent and interacting local and regional-scale factors drive shifts in the α and β diversities of communities in dynamic river ecosystems. We examined aquatic invertebrate assemblage responses to hydrological variability (as characterized by monthly observations of instream conditions) at 30 sites over a 12-year period encompassing typical years and two severe drought disturbances. Sites varied in their disturbance regimes and hydrological connectivity at both local (i.e. site-specific) and regional (i.e. river catchment) scales. Whereas α diversity was mainly influenced by local factors including flow permanence and the temporal extent of ponded and dry conditions, both temporal and spatial β diversities also responded to regional-scale metrics such as the spatial extent of flow and hydrological connectivity. We observed stronger local negative responses by taxa with lower capacities to tolerate drying (i.e. resistance) and/or to recover after flow resumes (i.e. resilience), whereas taxa with functional traits promoting resilience made an increasing contribution to spatial β diversity as hydrological connectivity declined. As droughts increase in extent and severity across global regions, our findings highlight the functional basis of taxonomic responses to disturbance and connectivity, and thus advance understanding of how drying disturbances shape biodiversity in river networks. Our identification of the role of regional hydrological factors could inform catchment-scale management strategies that support ecosystem resilience in a context of global change.</p>
Data from: Implications of non-native species for mutualistic network resistance and resilience
Resilience theory aims to understand and predict ecosystem state changes resulting from disturbances. Non-native species are ubiquitous in ecological communities and integrated into many described ecological interaction networks, including mutualisms. By altering the fitness landscape and rewiring species interactions, such network invasion may carry important implications for ecosystem resistance and resilience under continued environmental change. Here, I hypothesize that the tendency of established non-native species to be generalists may make them more likely than natives to occupy central network roles and may link them to the resistance and resilience of the overall network. I use a quantitative research synthesis of 58 empirical pollination and seed dispersal networks, along with extinction simulations, to examine the roles of known non-natives in networks. I show that non-native species in networks enhance network redundancy and may thereby bolster the ecological resistance or functional persistence of ecosystems in the face of disturbance. At the same time, non-natives are unlikely to partner with specialist natives, thus failing to support the resilience of native species assemblages. Non-natives significantly exceed natives in network centrality, normalized degree, and Pollination Service Index. Networks containing non-natives exhibit lower connectance, more links on average, and higher generality and vulnerability than networks lacking non-natives. As environmental change progresses, specialists are particularly likely to be impacted, reducing species diversity in many communities and network types. This work implies that functional diversity may be retained but taxonomic diversity decline as non-native species become established in networks worldwide.
Ecosystem resilience and pest resistance in Eucalyptus plantations is driven by understorey complexity due to forest management
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Local and regional drivers influence how aquatic community diversity, resistance and resilience vary in response to drying
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Data from: Implications of non-native species for mutualistic network resistance and resilience
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Data from: Symbiotic soil fungi enhance resistance and resilience of an experimental grassland to drought and nitrogen deposition
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In situ resistance, not immigration, supports invertebrate community resilience to drought intensification in a Neotropical ecosystem
<p class="MsoNoSpacing">While future climate scenarios predict declines in precipitations in many regions of the world, little is known of the mechanisms underlying community resilience to prolonged dry seasons, especially in "naïve" Neotropical rainforests. Predictions of community resilience to intensifying drought are complicated by the fact that the underlying mechanisms are mediated by species' tolerance and resistance traits<b>, </b>as well as rescue through dispersal from source patches.</p> <p class="MsoNoSpacing">We examined the contribution of <i>in situ</i> tolerance-resistance and immigration to community resilience, following drought events that ranged from the ambient norm to IPCC scenarios and extreme events.</p> <p class="MsoNoSpacing">We used rainshelters above rainwater-filled bromeliads of French Guiana to emulate a gradient of drought intensity (from 1 to 6 times the current number of consecutive days without rainfall), and we analyzed the post-drought dynamics of the taxonomic and functional community structure of aquatic invertebrates to these treatments when immigration is excluded (by netting bromeliads) or permitted (no nets).</p> <p class="MsoNoSpacing">Drought intensity negatively affected invertebrate community resistance, but had a positive influence on community recovery during the post-drought phase. After droughts of 1 to 1.4 times the current intensities, the overall invertebrate abundance recovered within invertebrate life cycle durations (up to 2 months). Shifts in taxonomic composition were more important after longer droughts, but overall, community composition showed recovery towards baseline states. The non-random patterns of changes in functional community structure indicated that deterministic processes like environmental filtering of traits drive community re-assembly patterns after a drought event. Community resilience mostly relied on <i>in situ </i>tolerance-resistance traits. A rescue effect of immigration after a drought event was weak and mostly apparent under extreme droughts.</p> <p class="MsoNoSpacing">Under climate change scenarios of drought intensification in Neotropical regions, community and ecosystem resilience could primarily depend on the persistence of suitable habitats and on the resistance traits of species, while metacommunity dynamics could make a minor contribution to ecosystem recovery. Climate change adaptation should thus aim at identifying and preserving local conditions that foster <i>in situ</i> resistance and the buffering effects of habitat features.</p>
Resistance and resilience of the soil microbiome to mechanical compaction under different agricultural management systems
<p>The growing demand for food production over the past decades has led to an increase in agricultural land intensity that requires intensive management and use of highly mechanized equipment. The increasing weight of such equipment and the continuation of mechanized operations for tillage, seeding, fertilizing, spraying, and harvesting even at low frequency can lead to soil compaction. In Europe for example, soil compaction is estimated to affect about 32-36% of the agricultural areas and this percentage is constantly rising.</p> <p>Soil compaction affects soil physical properties by increasing soil bulk density, changing aggregate size distribution and altering pore connectivity. As a result, macropore functions such as facilitating water infiltration, hydraulic conductivity, air permeability and diffusion are reduced. The decreased pore size and connectivity lead to a decrease in oxygen availability that further increases the number of anaerobic niches within soil. The impact of all these changes in soil physics and chemistry does ultimately affect the soil microbial community and shifts bacterial, archaeal and fungal diversity and function.</p> <p>Although researchers, farmers and stakeholders have a relatively good understanding of the impact of soil compaction on physical and chemical soil properties, much less is known about what soil compaction does to microbes. However, microbes are the ultimate operators of all enzymatic transformations in every soil’s biogeochemical cycle, making their understanding crucial under soil compaction. Moreover, there is a lack of standard measurements to investigate compaction effects on soil microorganisms and their associated ecosystem functions. This often leads to inaccurate assessments of soil compaction effects on the entire ecosystem and, as a consequence, poor regulations and managerial decisions.</p> <p>This thesis aims to improve the scientific understanding of the effects of soil compaction on microbial community diversity and function, as well as their resistance (impact) and resilience (recovery) under different agricultural management systems. The objectives of this study were (i) to assess the resistance and the resilience of the soil microbial community structure to compaction under different agricultural management systems, (ii) to assess if the previously observed shifts in microbial diversity under compaction translated into shifts in function potential and (iii) to provide more mechanistic insights into the nitrogen cycle in agricultural systems under different levels of soil compaction.</p> <p>In the first chapter of this thesis, we assessed for the first time the resistance and the resilience of the soil microbial diversity to compaction under different agricultural management systems. For the purpose of this chapter, permanent ley and two crop rotations with and without tillage were used after a single compaction event in a long-term field experiment with a microbial DNA metabarcoding approach. The DNA metabarcoding approach highlighted a shift in microbial diversity under compaction, specific for each agricultural management system. A relative increase in potential anaerobically metabolizing prokaryotes and saprotrophic fungi and bacteria under soil compaction was found. Additionally, microorganisms with aerobic or plant-host-associated lifestyles were generally negatively affected. Those observations appear to be a unifying concept that agrees with previous studies carried out in forest soils. Whereas crop yield recovered after two growing seasons, for the microbial community four growing seasons were not sufficient to recover although soil properties were similar between compaction treatments and control at the end of the experiment.</p> <p>Building on the first chapter, we assessed in the second chapter, if shifts in microbial diversity under compaction translated as well into shifts in its function potential because of functional redundancy among microbial species. For the purpose, shotgun metagenomics approach was used. For instance, shotgun metagenomics results confirmed the increase in metabolic potential of anaerobic functions and the decrease in the aerobic ones. This observation supported our previous findings on the microbial diversity and our inference on their potential lifestyle. However, in contrary to the microbial diversity, the shift in microbial metabolic potential under compaction was independent of agricultural management systems.</p> <p>In the third and last chapter of this thesis, we tested the effect of different moisture contents on compaction severity and used a more closed system to better understand nitrogen partitioning in soil. For this purpose, we have set up pea and wheat cropping systems in microcosms and used the qPCR method to target key nitrogen function groups and further measured concentrations of different nitrogen forms (ammonium, nitrate and nitrous oxide). Our findings confirmed that the severity and effects of soil compaction are linked to the initial soil water content. This chapter highlighted that soil compaction favored denitrifying bacteria. As a result, soil nitrate concentration decreased and soil nitrous oxide concentration increased. Less clear observations were made regarding the nitrification process; whereas there was an accumulation of soil ammonium concentration, the abundance of nitrifying bacteria and archaea showed no notable change. Additionally, like for the previous chapters, those changes in functions involved in the nitrogen cycle were independent of the cropping system and not necessarily aligned with plant growth.</p> <p>Overall, the results based on the hypotheses tested and methods used within this PhD thesis, either taken individually or combined, help to better understand the resistance and resilience of soil microbial community under different agricultural management systems affected by compaction. The combined use of molecular tools, such as metabarcoding and metagenomic approaches, was considered as a suitable approach to have an overview of the microbial diversity and metabolic potential. Those first observations can be the basis to formulate more precise hypothesis to be tested with qPCR as it has been done for this PhD thesis. Nevertheless, in order to make tangible inference on the potential lifestyle of each microbe and their potential metabolic function, these molecular tools -metabarcoding, metagenomics and qPCR - need to be upheld by physico-chemical soil analysis and metabolic process measurements. Only by using this combined approach, studies can finally interpret the increase or decrease in relative abundance of taxa or function under compaction. Finally, the interdisciplinary, long-term and mechanistic approaches involved in this thesis demonstrated that the studied biological actors (e.g., plant and microbes) as well as the soil physical properties were not necessarily aligned in their resistance and recovery. All those findings bring new and unique knowledges on the compaction impact on microbial diversity and function and highlight the need of assessing many components of the agricultural system in order to make policy recommendations towards a more sustainable agriculture.</p>
BRAND'S® Essence of Chicken in the Promotion of Resilience and Resistance to Stress-associated Cognitive Inhibition
ClinicalTrials.gov study NCT02166931. IPD Sharing: Not stated. Countries: 1. Publications: 0.
In situ resistance, not immigration, supports invertebrate community resilience to drought intensification in a Neotropical ecosystem
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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.