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139 results for “intraspecific trait”
Data from: Intraspecific trait variation and colonization sequence alter community assembly and disease epidemics
When individuals from multiple populations colonize a new habitat patch, intraspecific trait variation can make the arrival order of colonists an important factor for subsequent population and community dynamics. In particular, intraspecific priority effects (IPEs) allow early arrivers to limit the growth or establishment of later arrivers, even when competitively inferior on a per-capita basis. Through their effects on genes and traits, IPEs can alter short-term growth and long-term evolutionary change in single species metapopulations. Given their importance for intraspecific interactions, IPEs in a dominant species have the potential to affect the composition of entire communities. We conducted an experiment to determine whether and how arrival order and IPEs in the zooplankter Daphnia pulex affected its interactions with both competitors (the cladoceran Simocephalus vetulus) and parasites (the virulent fungus Metschnikowia bicuspidata). We found strong evidence for IPEs in Daphnia, as early arrivers inhibited late arrivers even when competitively inferior. These IPEs in Daphnia altered both the establishment success of interspecific competitors and the size of disease epidemics: early colonization by fast-growing D. pulex led to large Daphnia populations and low competitor establishment, but large disease epidemics. Early colonization by slow-growing D. pulex, on the other hand, resulted in small Daphnia populations with high competitor establishment, but smaller disease epidemics. Overall, our results demonstrate the importance of intraspecific variation and arrival order for community dynamics, and highlight IPEs as a general mechanism driving variation in natural communities.
Data from: Nitrogen enrichment and warming shift community functional composition via distinct mechanisms: the role of intraspecific trait variability and species turnover
<p>1. Global change factors may shift community functional composition by driving species turnover (species occurrence and species relative abundance) and intraspecific trait variability. However, their relative contribution in determining the functional response of community to global change, especially nitrogen enrichment and warming, remains unclear.</p> <p>2. We conducted a fully factorial field experiment in a Tibetan alpine meadow to examine responses of plant community functional composition to nitrogen enrichment and warming by quantifying seven plant functional traits in each plot. Using the sum of squares decomposition, we further disentangled the relative contribution of intraspecific trait variability and species turnover to changes in community functional composition.</p> <p>3. We found that nitrogen enrichment caused a shift of plant community toward a more resource-acquisitive strategy, while warming resulted in a shift toward a more resource-conservative strategy. Plant intraspecific trait variability controls shifts in community functional composition in response to nitrogen enrichment, whereas species turnover (especially change in species relative abundance) mainly explains warming-induced shifts. Nitrogen enrichment and warming did not show significant interactive effects on plant functional composition.</p> <p>4. These findings suggest that nitrogen enrichment and warming can alter community functional composition of alpine meadow through distinct mechanisms. Plant intraspecific trait variability confers functional resilience of Tibetan alpine meadows under nitrogen enrichment, but warming could induce significant turnover of species that pronouncedly impacts community functioning in this highland ecosystem.</p>
Tree and mycorrhizal fungal diversity drive intraspecific and intraindividual trait variation in temperate forests: evidence from a tree diversity experiment
<p>Scripts and dataset for Castro Sánchez-Bermejo et al., 2024 "Tree and mycorrhizal fungal diversity drive intraspecific and intraindividual trait variation in temperate forests: evidence from a tree diversity experiment"</p>
Intraspecific trait variation and species turnover mediate grazing impacts on above- and below-ground functional trait composition of plant communities
<ol> <li>Although grazing has significant impacts on plant functional traits and community composition in grasslands, few studies have simultaneously explored how plant above- and below-ground traits and community functional composition respond to grazing.</li> <li>Using a grazing manipulation experiment with seven levels of grazing intensity (0, 1.5, 3.0, 4.5, 6.0, 7.5, and 9 sheep ha<sup>-1</sup>) in the Inner Mongolia grassland, we partitioned the roles of intraspecific trait variation (ITV) and species turnover underlying the grazing induced changes in above- and below-ground functional trait composition of plant communities. Six aboveground traits (i.e. plant height, plant aboveground biomass, plant density, leaf area, specific leaf area (SLA) and leaf density) and three root traits (average root diameter, ARD; specific root length, SRL; and root tissue density, RTD) of the first-, second- and third-order roots (1<sup>st</sup>-, 2<sup>nd</sup>-, and 3<sup>rd</sup>-) were measured at the plant individual level. </li> <li>At the community level, plant above-ground traits shifted towards grazing avoidance strategy (e.g. plant height and leaf area decreased), and below-ground traits shifted towards conservative strategy (i.e. 1<sup>st</sup>-SRL and 2<sup>nd</sup>-SRL decreased, 1<sup>st</sup>-RTD and 2<sup>nd</sup>-ARD increased) with increasing grazing intensity. Functional tradeoffs were found between plant individual biomass and plant density, and between leaf area and leaf density under grazing. However, community-weighted mean SRL (SRL<sub>CWM</sub>) and ARD (ARD<sub>CWM</sub>) of different root orders exhibited functional coordination under grazing pressure. SLA<sub>CWM</sub> and SRL<sub>CWM</sub> also showed synergistic responses to grazing.</li> <li> The ITV plays a predominant for the changes in above- and below-ground functional trait composition at the community level. However, changes in mean trait values among plant species with different resource use strategies were mainly triggered by species turnover. For species with different resource use strategies, grazing exhibited a coordinated effects on ITV but an offset effect on species turnover.</li> <li> <i>Synthesis.</i> Our results demonstrate that both the above- and below-ground trait composition of plant communities shifted toward conservative strategy under long-term grazing. This study highlights the effects of ITV and species turnover that govern the grazing-induced changes in functional trait composition of plant communities, and has important implications for grazing management in semiarid grasslands.</li> </ol>
Data from: Intraspecific trait variation and colonization sequence alter community assembly and disease epidemics
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Data from: Intraspecific trait variation increases species diversity in a trait-based grassland model
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Data from: Spatially structured intraspecific trait variation can foster biodiversity in disturbed, heterogeneous environments
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Data from: Temporal intraspecific trait variability drives responses of functional diversity to inter-annual aridity variation in grasslands
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Data from: Spatial scale and intraspecific trait variability mediate assembly rules in alpine grasslands
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Intraspecific trait variation and species turnover mediate grazing impacts on above- and below-ground functional trait composition of plant communities
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Species responses to changing precipitation depends on trait plasticity rather than trait means and intraspecific variation
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Data from: Bridging inter- and intraspecific trait evolution with a hierarchical Bayesian approach
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Data from: Nitrogen enrichment and warming shift community functional composition via distinct mechanisms: the role of intraspecific trait variability and species turnover
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Data from: Intraspecific trait variation is correlated with establishment success of alien mammals
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Data from: Bony traits and genetics drive intraspecific variation in vertebrate elemental composition
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Data from: Intraspecific variations in leaf traits, productivity, and resource use efficiencies in the dominant species of subalpine evergreen coniferous and deciduous broad-leaved forests along the altitudinal gradient
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Data from: Intraspecific variations in life history traits of two pecky rice bug species from Japan: mapping emergence dates and number of annual generations
<p>The mirid bugs Stenotus rubrovittatus and Trigonotylus caelestialium, which cause pecky rice, have become a threat to rice cultivation in Asia. Damage caused by these pests has rapidly become frequent since around 2000 in Japan. Their expansion pattern is not simple, and predicting their future spread remains challenging. Some insects with wide ranges have locally adapted variations in life-history traits. We performed laboratory rearing experiments to assess the geographical scale of intraspecific variations in life-history traits of S. rubrovittatus and T. caelestialium. The experiments were aimed at increasing the accuracy of occurrence estimates and the number of generations per year. These results were compared with previous research, and differences in development rates were observed between populations of different latitudes, but not of the same latitude. Finally, plotting the timing of adult emergence and the potential number of generations per year on maps with a 5-km grid revealed that they differed greatly locally at the same latitude. These maps can be used for developing more efficient methods of managing mirid bugs in integrated pest management.</p>
Data from: Intraspecific variation in climate-relevant traits in a tropical rainforest lizard
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Data from: Intraspecific variations in life history traits of two pecky rice bug species from Japan: mapping emergence dates and number of annual generations
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Allen Brain Atlas
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