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139 results for “intraspecific trait”
Code from: A theoretical framework for trait-based eco-evolutionary dynamics: population structure, intraspecific variation, and community assembly
<p>How is trait diversity in a community apportioned between and within co-evolving species? Disruptive selection may result in either a few species with large intraspecific trait variation (ITV) or many species with different mean traits but little ITV. Similar questions arise in spatially structured communities: heterogeneous environments could result in either a few species that exhibit local adaptation or many species with different mean traits but little local adaptation. To date, theory has been well-equipped to either include ITV or to dynamically determine the number of coexisting species, but not both. Here, we devise a theoretical framework that combines these facets, and apply it to the above questions of how trait variation is apportioned within and between species in unstructured and structured populations, using two simple models of Lotka-Volterra competition. For unstructured communities, we find that as the breadth of the resource spectrum increases, ITV goes from being unimportant to crucial for characterizing the community. For spatially structured communities on two patches, we find no local adaptation, symmetric local adaptation, or asymmetric local adaptation depending on how much the patches differ. Our framework provides a general approach to incorporate ITV in models of eco-evolutionary community assembly.</p>
Data from: Nitrogen addition and warming modulate the pathogen impact on plant biomass by shifting intraspecific functional traits and reducing species richness
<p><span>1. </span><span>Foliar fungal pathogens can substantially reduce plant biomass. This effect can be modulated by environment conditions, such as soil nitrogen availability and air temperature. The ongoing global changes are altering these variables and thus interact with pathogens to influence plant biomass, but experimental test of their interactions is scarce. </span></p> <p><span>2. </span><span>We conducted a 4-year field experiment in a Tibetan alpine meadow to examine the interactive effects of nitrogen addition, warming and foliar pathogens (via fungicide application) on plant biomass. We also measured plant functional traits, species richness and abundance to test the possible mechanisms underlying these interactions. </span></p> <p><span>3. </span><span>Our results showed that foliar fungal pathogens reduced plant community biomass under nitrogen addition, which in turn weakened the positive nitrogen effect on community biomass. Mechanistically, nitrogen addition shifted the plant communities towards fast-growing traits; this happened predominantly because of changes in within-species trait values, including an increase in specific leaf area and height. These trait changes resulted in greater suppression of plant biomass by pathogens, likely because of the trade-offs associated with the allocation of resources to plant growth and defense. Moreover, the reduction in species richness amplified the pathogen effect under nitrogen addition due to the increased density and susceptibility of the most dominant species (i.e. Kobresia capillifolia). Furthermore, warming did not interact with pathogens and nitrogen addition to influence plant community biomass, but their three-way interaction modified the biomass of K. capillifolia. Specifically, warming enhanced the positive effect of nitrogen addition on the biomass of K. capillifolia in the fungicide, low infection plots, while it weakened the nitrogen effect in the no fungicide, high infection plots.</span></p> <p><span>4. </span><span>Synthesis:</span> <span>Our results demonstrate how pathogens interact with nitrogen addition and warming to influence the biomass of dominant species and the whole plant community. Our study highlights the importance of considering foliar fungal pathogens when assessing ecosystem responses to multiple global change factors.</span></p>
Predicting global intraspecific trait variation of grasses
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Data from: Variation in selective regimes drives intraspecific variation in life-history traits and migratory behaviour along an elevational gradient
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Data from: Intraspecific variation in seed dispersal of a Neotropical tree and its relationship to fruit and tree traits
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Disentangling biotic and abiotic drivers of intraspecific trait variation in woody plant seedlings at forest edges
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Predicting intraspecific trait variation among California’s grasses
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Data from: Geographic scale and disturbance influence intraspecific trait variability in leaves and roots of North American understory plants
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Data from: Inter- and intraspecific variation in leaf economics traits in wheat and maize
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Data from: Intraspecific trait variation across multiple scales: the leaf economics spectrum in coffee
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Data from: Incorporating intraspecific trait variation into functional diversity: impacts of selective logging on birds in Borneo
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Data from: Sampling intraspecific variability in leaf functional traits: practical suggestions to maximize collected information
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Data from: Intraspecific trait variation and trade-offs within and across populations of a toxic dinoflagellate
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Intraspecific variation of Phragmites australis: Clinal adaption of functional traits and phenotypic plasticity vary with latitude of origin
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Data from: Environmental resource deficit may drive the evolution of intraspecific trait variation in invasive plant populations
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Data from: Intraspecific trait changes have large impacts on community functional composition but do not affect ecosystem function
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Data from: Intraspecific variability and reaction norms of forest understory plant species traits
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Intraspecific mating system evolution and its effect on complex male secondary sexual traits: does male-male competition increase selection on size or shape?
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Global gradients in intraspecific variation in vegetative and floral traits are partially associated with climate and species richness
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Long-term warming affects ecosystem functioning through species turnover and intraspecific trait variation
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