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101 results for “seed production”
Temporal stabilizing effects of species richness and seed arrangement on grassland biomass production
<p><span>1. The extent to which individuals experience inter- and intraspecific interactions through their spatial arrangements within diverse plant communities, whether because of confounding effects of species richness, evenness, or direct changes in species patch sizes on their neighborhood relationships, could affect grassland biomass production and its stability at community scales. Elucidating the ways in which neighborhood effects and species richness contribute to such community responses has important implications for how practitioners establish grasslands to meet forage production and conservation goals. </span></p> <p><span>2. We assessed the effects of altering plant species richness (3 levels: 2, 4, or 8 forage species per plot) and seed arrangements (4 levels: species mixed and seeded or seeded in 0.0625 m<sup>2</sup>, 0.25 m<sup>2</sup>, or 1.0 m<sup>2</sup> single-species patches while maintaining plot-scale species evenness) on aboveground biomass production and its temporal stability in developing grasslands seeded with a suite of globally common forage species (three legumes, three cool-season grasses, two warm-season grasses). </span></p> <p><span>3. Communities seeded with more species and those with their seeds arranged into smaller conspecific patches produced more biomass</span><span> and were more temporally </span><span>stable than those seeded with fewer species and larger conspecific patches. The effect of manipulating species arrangements is attributable to greater neighborhood scale interspecific interactions and stronger complementary effects. Furthermore, seeding species into conspecific patches resulted in communities that were 34% more productive, that were just as temporally stable, and that had similar diversity effects as those seeded with a species mixture, as is common in grassland reconstruction efforts. </span></p> <p><span>4</span><span>. <em>Synthesis: </em></span><span>In comparison with conventional mixed-seeding methods, seeding grasslands with high species richness and small, single-species patches may promote grassland reconstruction through increased biomass production, temporal stability, and complementarity effects</span><span>.</span><span> Our study highlights the importance of </span><span>regulating intraspecific interactions within diverse communities for improving grassland biomass production</span><span> and suggests that efforts to reevaluate methods used to establish forage and conservation grasslands could result in greater biomass production and stability in these systems</span><span>.</span></p>
Plant responses to ramet density and herbivory under natural field conditions: Impacts on volatile organic compound emissions and seed production
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Data from: Exclusion of introduced deer increases size and seed production success in an island-endemic plant species
The presence of extra-local invaders, such as the southern California mule deer (Odocoileus hemionus) on Santa Catalina Island, may contribute to more selective and insidious effects within the unique ecosystems that have evolved in their absence. Studies at the species level may detect effects not noticed in broader, community level vegetation monitoring or help tease apart differences in the level of effect among the various ecological components of an invaded system. In this initial study, we measured the impacts of herbivory by mule deer, a species native to analogous habitats on the adjacent mainland, on size and seed production success for Crocanthemum greenei (island rush-rose), a federally listed sub-shrub that is not present on mainland California. We found deer exclusion resulted in an overall increase in stem measurement of 18.8 cm. Exclosure populations exhibited complete seed production success, whereas control populations showed significantly reduced success and exhibited complete failure within 58% of populations. These results show that the introduced mule deer on Santa Catalina Island are negatively affecting a federally threatened plant species. This strongly implies that the current deer management strategy is insufficient, if one of its goals is biodiversity and endemic species conservation.
Determinants of Smallholder Farmers Technical Efficiency of Bread Wheat Production and Implications of Seed Recycling in Ethiopia: The Stochastic Frontier Approach
<p>This is a survey data gathered from two districts of East Gojam Zone, Ethiopia for a study entitled with "Determinants of Smallholder Farmers Technical Efficiency of Bread Wheat Production and Implications of Seed Recycling in Ethiopia: The Stochastic Frontier Approach"</p>
Data from: Rye planting date impacts biomass production more than seeding rate and nitrogen fertilizer
<p>This zipped folder contains the code and datasets used for an experiment conducted over six years (2015–2020) at the Wiregrass Research and Extension Center in Headland, AL to examine rye biomass production. Treatments included four planting dates (late October, early November, late November, and early December), two seeding rates ( 67 and 101 kg ha<sup>-1</sup>), and four nitrogen rates (0, 34, 67, and 101 kg ha<sup>-1</sup>) replicated four times for a total of 128 observations each year. Measured and/or calculated variables from the data set included biomass, total C and N concentrations for the plant material, C:N ratio, N uptake values, as well as cost info for the biomass. In addition, there are three years of peanut yield data (2015, 2017, 2019) and only two years of cotton yield data (2016, 2020). No cotton data was collected for 2018 due to hurricane damage. Initial and final soil total C values were also measured across the 0 and 101 kg N ha<sup>-1 </sup>rates for the 67 kg ha<sup>-1</sup> seeding rate. </p>
Data from: Rye planting date impacts biomass production more than seeding rate and nitrogen fertilizer
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Data from: Effects of nitrogen deposition on reproduction in a masting tree: benefits of higher seed production are trumped by negative biotic interactions
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Temporal stabilizing effects of species richness and seed arrangement on grassland biomass production
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Data from: High genotypic diversity and strong spatial structure in populations of Trifolium alpestre with low seed production
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Data from: ENSO and frost co-determine decade-long temporal variation in flower and seed production in a subtropical rain forest
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Disentangling direct and indirect effects of habitat fragmentation on wild plants' pollinator visits and seed production
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Data from: Evidence for enemy release and increased seed production and size for two invasive Australian acacias
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Data from: Exclusion of introduced deer increases size and seed production success in an island-endemic plant species
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Data from: Parasitoid wasps indirectly suppress seed production by stimulating consumption rates of their seed-feeding hosts
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Data from: Species patch size at seeding affects diversity and productivity responses in establishing grasslands
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Data from: The triangular seed mass-leaf area relationship holds for annual plants and is determined by habitat productivity
Plant allometries help us to understand resource allocation in plants and provide insight into how communities are structured. For woody species, a triangular allometric relationship between seed size and leaf size occurs in which all combinations are all possible, except for species with big seeds and small leaves (Cornelissen 1999). This relationship is thought to be a consequence of between habitat variation in abiotic conditions. In this study, we tested if the triangular relationship between seed mass and leaf area holds for annual species, and if variation in soil productivity and light (measured as Ellenberg indicator values: EIVs) are driving this relationship. We show that the triangular relationship also holds for annuals, which suggests that the allometric combinations between leaf area and seed mass are conserved across life-forms. The triangular relationship was driven by between-habitat variation in soil productivity. This means that as soil productivity increases, plants with bigger leaves could have either big or small seeds. However, in low soil productivity habitats, plants are constrained in their options, and plants with small leaves can only have small seeds.
Fig. 3 in Neolignans from Myristica fragrans seeds, revision of their absolute configurations, reduction products and biological activities
Fig. 3. Experimental and calculated ECD spectra of 1a-4a and 1b–4b.
Fig. 2 in Neolignans from Myristica fragrans seeds, revision of their absolute configurations, reduction products and biological activities
Fig. 2. Experimental and calculated ECD spectra of 1–4.
Fig. 1 in Neolignans from Myristica fragrans seeds, revision of their absolute configurations, reduction products and biological activities
Fig. 1. Structures of neolignans 1–4 and reduction products (1a-4a and 1b–4b).
Data from: Is increased male flower production a strategy for avoidance of predispersal seed predation in andromonoecious plants?
<p>Floral gender in angiosperms often varies within and among populations. We conducted a field survey to test how predispersal seed predation affects sex allocation in an andromonoecious alpine herb <i>Peucedanum multivittatum</i>. We compared plant size, male and perfect flower production, fruit set, and seed predation rate over three years among nine populations inhabiting diverse snowmelt conditions in alpine meadows. Flowering period of individual populations varied from mid-July to late August reflecting the snowmelt time. Although perfect flower and fruit productions increased with plant size, size-dependency of male flower production was less clear. The number of male flowers was larger in the early-flowering populations, while the number of perfect flowers increased in the late-flowering populations. Thus, male-biased sex allocation was common in the early-flowering populations. Fruit-set rates varied among populations and between years, irrespective of flowering period. Fruit-set success of individual plants increased with perfect flower number, but independent of male flower number. Seed predation by lepidopteran larvae was intense in the early-flowering populations, whereas predation damage was absent in the late-flowering populations, reflecting the extent of phenological matching between flowering time of host plants and oviposition period of predator moths. Seed predation rate was independent of male and perfect flower numbers of individual plants. Thus, seed predation is a stochastic event in each population. There was a clear correlation between the proportion of male flowers and the intensity of seed predation among populations. These results suggest that male-biased sex allocation could be a strategy to reduce seed predation damage but maintain the effort as a pollen donor under intensive seed predation.</p>
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Allen Brain Atlas
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DANDI Archive for NWB datasets
DANDI is a BRAIN Initiative archive for publishing and sharing neurophysiology data, including electrophysiology, optophysiology, and behavioral data packaged as NWB and related standards.
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.