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86 results for “seed size”
UCSB SONGS Mitigation Monitoring: Wetland Process Study - Irrigation, Decompaction, Amendment, Planting and Seeding Experiment Plant Size
These data describe estimates of the condition and size of three species of salt marsh plants (Arthrocnemum subterminale, Frankenia salina, and Salicornia virginica) planted in experimental plots designed to evaluate the effectiveness of various soil treatments on increasing vegetation cover at the San Dieguito Wetlands (Del Mar, California). Plots established between 1.61 – 2.1 m MLLW were manipulated to test the effects of irrigation, decompaction, soil amendments, and planting versus seeding, whereas plots between 1.6 – 1.7 m MLLW tested the effects of planting versus seeding alone. Data collection was conducted from 2020 to 2022. During each survey, the length of the longest axis and maximum perpendicular width of each planted individual was measured.
Text-fig. 3. Examples of plant macrofossil assemblages from post-evaporitic sections. a: bedding plane from Ciabòt Cagna covered by impressions of plant parts, with dominance of leaves of cf. Oleinites liguricus M.SACHSE, MCEA-P05038. b: waterloggedcompressed seeds of Toddalia latisiliquata (R.LUDW.) H.-J.GREGOR sieved out of a bulk sediment sample from Pollenzo, MGPTPU141033. c: millimeter-sized, waterlogged-compressed seeds of Sambucus pulchella C.REID et E.REID with abundant cracks, probably formed during both diagenesis and extraction of the fossils (bulk sediment sample from Ciabòt Cagna), MGPT- in Late Messinian Flora From The Post-Evaporitic Deposits Of The Piedmont Basin (Northwest Italy)
Text-fig. 3. Examples of plant macrofossil assemblages from post-evaporitic sections. a: bedding plane from Ciabòt Cagna covered by impressions of plant parts, with dominance of leaves of cf. Oleinites liguricus M.SACHSE, MCEA-P05038. b: waterloggedcompressed seeds of Toddalia latisiliquata (R.LUDW.) H.-J.GREGOR sieved out of a bulk sediment sample from Pollenzo, MGPTPU141033. c: millimeter-sized, waterlogged-compressed seeds of Sambucus pulchella C.REID et E.REID with abundant cracks, probably formed during both diagenesis and extraction of the fossils (bulk sediment sample from Ciabòt Cagna), MGPT-
DataSet from H. Merienne et al., "Walking kinematics in the polymorphic seed harvester ant Messor barbarus: influence of ant size and load carriage"
<p>DataSet from H. Merienne et al., “Walking kinematics in the polymorphic seed harvester ant Messor barbarus: influence of ant size and load carriage”</p>
Seedball technology counterbalances the effect of small seed-size and low soil nutrients on early pearl millet seedling performance
<p>In the African Sahel region, pearl millet (<em>Pennisetum glaucum</em> (L). R. Brown) is often produced in low-nutrient soils. Seed weight could vary between 4 and 44 mg per seed. Evidence shows chemically infertile soil and small seed size significantly reduce seedling establishment and, in turn, cause low grain yield. Seedball technology can potentially counterbalance this effect. Therefore, the objective of this study was to investigate the influence of seedball on pearl millet seedling establishment. Conventionally sown and seedball-derived pearl millet seedlings of a local and an improved varieties were grown for 29 days from small and large seed sizes, in low- and medium-nutrient soils at a greenhouse of University of Hohenheim, Germany. Results showed that under low-nutrient conditions and with small seed sizes produced biomass was generally inferior to the other factor combinations. Seedball technology significantly enhanced seedling vigour, leaf number, plant height, dry matter, root length as well as fine root development, and nutrient uptake irrespective of soil nutrient level and seed size. These enhancement effects were more obvious in the local variety. A previous study revealed “early nutrient release in the seedling root zone” as seedball pearl millet seedling enhancement mechanism. The released nutrients presumably compensated for nutrient deficiency in low-nutrient soil and small seed seedlings. In the Sahelian pearl millet production system where (i) low soil nutrients, (ii) small seed sizes and (iii) local seed varieties are rampant, the application of the seedball technology under these conditions is proven effective for increased seedling vigour and is therefore recommended.</p>
Data used in: Heritability and variance components of seed size in wild species: influences of breeding design and the number of genotypes tested
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Data from: Diverging evolutionary trajectories for palm seed sizes in mainland Africa and Madagascar
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Sexual selection in wild populations of seed bugs: the role of size in pre-copulatory mate choice by females and males
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Trade-offs between seed size and biotic interactions contribute to coexistence of co-occurring species that vary in fecundity
<p>Despite theoretical advances, the ecological factors and functional traits that enable species varying in seed size and fecundity to coexist remain unclear. Given inherent fecundity advantages, why don't small-seeded species dominate communities?</p> <p>In perennial grasslands, we evaluated whether small-seeded species are less tolerant of competition from the community dominant bunchgrass than large-seeded species but also less vulnerable to seed predation by mice. We also explored whether trade-offs involving competitive tolerance include two other functional traits, height and leaf mass per area (LMA). We added seeds of 17 forb species to plots where bunchgrass competition and rodent seed predation were manipulated across sites varying in bunchgrass productivity and thus competitive intensity. Seeds were added at densities mimicking interspecific variation in fecundity among target species.</p> <p>Standardizing for differences in fecundity (i.e. seed input; which enabled us to evaluate inherent interspecific differences in susceptibility to biotic interactions), bunchgrass competition more greatly reduced recruitment and establishment of small vs. large-seeded species, whereas rodent seed predation more greatly reduced the recruitment of large- versus small-seeded species. Plant height and LMA were unrelated to the competition effect size.</p> <p>Small-seeded species abundance decreased across sites increasing in bunchgrass productivity, whereas this was not the case for large-seeded species. For adult plants but not seedlings, community weighted functional trait means (CWM) for seed size, height, and LMA increased in plots with versus without bunchgrass competition and the CWM for seed size and height also increased at sites with greater bunchgrass productivity (for adults only). In contrast, rodent seed predation had no significant effects on CWM seed size.</p> <p>At the end of the experiment, adult abundance positively correlated with plant fecundity in plots lacking bunchgrass, indicating the inherent advantages accrued to high fecundity small-seeded species. However, with bunchgrass competition, abundances were equalized across species due to reduced competitive tolerance of high fecundity small-seeded species.</p> <p>Synthesis: Our results suggest that coexistence among subordinate forb species varying in seed size and fecundity is in-part due to a trade-off involving competitive tolerance and fecundity, mediated by seed size and associated functional traits.</p>
Data from: Seed size predicts global effects of small mammal seed predation on plant recruitment
<p>We conducted a global literature review and meta-analysis to evaluate whether seed size could predict post-dispersal seed predator effects on seed removal and plant recruitment, respectively. Datasets were built using data extracted from published studies focusing on seed predation by small mammals (see Methods for criteria and data extraction protocol). We found that seed size predicted small mammal seed removal rates and their impacts on plant recruitment consistent with optimal foraging theory, with intermediate seed sizes most strongly impacted globally - for both native and exotic plants. However, differences in seed size distributions among ecosystems conditioned seed predation patterns, with relatively larger-seeded species most strongly affected in grasslands (smallest seeds), and relatively smaller-seeded species most strongly affected in tropical forests (largest seeds). Such size-dependent seed predation has profound implications for coexistence among plants because it may enhance or weaken opposing life-history tradeoffs in an ecosystem-specific manner. Our results suggest that seed size may serve as a key life-history trait that can integrate consumer effects to improve understandings of plant coexistence. </p>
Data from: Seedling recruitment correlates with seed input across seed sizes: implications for coexistence
Understanding controls on recruitment is critical to predicting community assembly, diversity and coexistence. Theory posits that at mean fecundity, recruitment of highly fecund small-seeded plants should be primarily microsite limited, which is indicated by a saturating recruitment function. In contrast, species that produce fewer large seeds are more likely to be seed-limited, which is characterized by a linear recruitment function. If these patterns hold in nature, seed predation that disproportionately affects larger-seeded species can limit their establishment. We tested these predictions by comparing recruitment functions among 16 co-occurring perennial forb species that vary by over two orders of magnitude in seed size. We also assessed how post-dispersal seed predation by mice influenced recruitment. We added seeds at densities from zero to three times natural fecundity of each species to undisturbed plots and examined spatial variation in recruitment by conducting experiments across ten grassland sites that varied in productivity and resource availability. Consistent across two replicated years, most species had linear recruitment functions across the range of added seed densities, indicative of seed-limited recruitment. Depending on year, the recruitment functions of only 19-37% of target species saturated near their average fecundity, and this was not associated with seed size. Recruitment was strongly inhibited by rodent seed predation for large-seeded species but not for smaller-seeded species. Proportional recruitment was more sensitive to spatial variation in recruitment conditions across sites for some small-seeded species than for large-seeded species. These results contradict the common belief that highly fecund small-seeded species suffer from microsite-limited recruitment. Rather, they imply that, at least episodically, recruitment can be strongly correlated to plant fecundity. However, proportional recruitment of small-seeded species was inhibited at productive sites to a greater extent than large-seeded species. Results also show that in a system where the dominant granivore prefers larger seeds, low-fecundity large-seeded species can suffer from even greater seed-limited recruitment than would occur in the absence of predators.
Data from: Selection for seed size: the unexpected effects of water availability and density
1. Seed size is a functional trait with important fitness consequences that potentially extend throughout the life cycle of plants. Dithyrea californica experiences selection for larger seeds in post‐germination stages but it is still uncertain how environmental factors mediate the strength and the direction of natural selection on seed size. 2. D. californica represents a unique opportunity to investigate selection on seed size in natural conditions due to a persistent seed ring that stays attached to the root throughout the plant's life. This makes it possible to unearth plants at any stage and measure the size of the seed from which they originated. 3. We conducted a factorial experiment manipulating water availability and intraspecific competition using plants that naturally germinated in the wild. 4. Selection on seed size via survivorship was nil because all individuals survived to reproduce. The strength and the direction of selection on seed size via fecundity depended on water availability and conspecific density. 5. Contrary to our predictions, increasing conspecific density relaxed directional selection favoring larger seeds, but only in the wettest conditions and an increase in water availability strengthened it, but only at low density. A possible explanation of these counter‐intuitive results relies on the observed absence of survival selection and increased plant growth rates under high water and low density. 6. Larger seeds require more resources to construct and when this cost is taken into account; there is no overall fitness increase with seed size. This nicely follows the life history theory predictions for optimal seed size. At the evolutionary equilibrium, if seeds could be larger, per seed fitness would still increase, which is what we observed. But cost corrected fitness should be flat. Maternal fitness equals per seed fitness times seed number, so any increase to per seed fitness of making a bigger seed is balanced by the resulting cost to seed number. Our results indicate flat cost corrected fitness of seed size as theory predicts.
Data set associated to simulations performed within the manuscript "Endosperm turgor pressure both promotes and restricts seed growth and size".
<p>This dataset contains the following files</p> <ul> <li>2F4-Col0-iku2-Fig.3f and Supp. Fig.9 <ul> <li>Slices of seeds from 3 to 9 Days post-anthesis (DPA) stained with calcofluor (channel 1) and whose unesterified pectins are labelled with the 2F4 antibody (channel 2)</li> <li>2 genotypes: Col0 and iku2</li> <li>3 independent experiments</li> </ul> </li> <li>JIM5-Col0-ap2-Fig. 4d and Supp Fig. 12b <ul> <li>Slices of seeds from 3 to 9 Days post-anthesis (DPA) stained with calcofluor (channel 1) and whose demethylesterified pectins are labelled with the JIM5 antibody (channel 2)</li> <li>2 genotypes: Col0 and ap2-6</li> <li>2 independent experiments</li> </ul> </li> <li>JIM5-Col0-iku2-Fig. 3h and Supp Fig. 10 <ul> <li>Slices of seeds from 3 to 9 Days post-anthesis (DPA) stained with calcofluor (channel 1) and whose demethylesterified pectins are labelled with the JIM5 antibody (channel 2)</li> <li>2 genotypes: Col0 and iku2</li> <li>3 independent experiments</li> </ul> </li> <li>LM19-Col0-ap2-Fig. 4b and Supp Fig. 12a <ul> <li>Slices of seeds from 3 to 9 Days post-anthesis (DPA) stained with calcofluor (channel 1) and whose demethylesterified pectins are labelled with the LM19 antibody (channel 2)</li> <li>2 genotypes: Col0 and ap2-6</li> <li>2 independent experiments</li> </ul> </li> <li>LM19-Col0-iku2-Fig. 3d and Supp Fig. 8 <ul> <li>Slices of seeds from 3 to 9 Days post-anthesis (DPA) stained with calcofluor (channel 1) and whose demethylesterified pectins are labelled with the LM19 antibody (channel 2)</li> <li>2 genotypes: Col0 and iku2</li> <li>3 independent experiments</li> </ul> </li> <li>pELA1-VENUS-Col0-iku2-Fig3c <ul> <li>Confocal stack of developing seeds expressing <em>pELA1::3X-VENUS-N7</em></li> <li>2 genotypes: Col0 and iku2</li> <li>1 independent experiments</li> </ul> </li> <li>pELA1-VENUS-Col0-iku2-Supp Fig. 6 <ul> <li>Confocal stack of developing seeds expressing <em>pELA1::3X-VENUS-N7</em></li> <li>2 genotypes: Col0 and iku2</li> <li>1 independent experiments</li> </ul> </li> <li>Seed-size-ap26-iku2-Fig.5e-Supp-Fig. 12c <ul> <li>Pictures of dry seeds</li> <li>4 genotypes: Col0, iku2, ap2-6 and iku2 ap2-6</li> <li>2 independent experiments</li> </ul> </li> <li>Wall-rupture-Col0-iku2-Fig3k <ul> <li>Confocal stack of developing seeds expressing <em>LTi6b-GFP </em>(First channel) and dyed with FM4-64 (second channel) imaged after a 40 µm indentation to break testa wall</li> <li>2 genotypes: Col0 and iku2</li> <li>2 replicates</li> </ul> </li> <li>Wall-rupture-Col0-iku2-Supp Fig. 11 <ul> <li>Confocal stack of developing seeds expressing <em>LTi6b-GFP </em>(First channel) and dyed with FM4-64 (second channel) imaged after a 30 µm or a 50µm indentation to break testa wall</li> <li>2 genotypes: Col0 and iku2</li> <li>2 replicates</li> </ul> </li> <li>181211-Col0-iku2-Timelapse-Seed-Size <ul> <li>Pictures of developing seeds from 0 (ovules) days post-anthesis (DPA) to 10 DPA</li> <li>2 genotypes: Col0 and iku2</li> </ul> </li> <li>190125-Col0-iku2-Timelapse-Seed-Size <ul> <li>Pictures of developing seeds from 0 (ovules) days post-anthesis (DPA) to 10 DPA (no 9DPA)</li> <li>2 genotypes: Col0 and iku2</li> </ul> </li> <li>190523-Col0-ede13-Timelapse-Seed-Size <ul> <li>Pictures of developing seeds from 0 (ovules) days post-anthesis (DPA) to 9DPA</li> <li>2 genotypes: Col0 and <em>ede1-3</em></li> </ul> </li> <li>200724-Col0-iku2-Timelapse-Seed-Size <ul> <li>Pictures of developing seeds from 0 (ovules) days post-anthesis (DPA) to 10DPA</li> <li>2 genotypes: Col0 and <em>iku2</em></li> </ul> </li> <li>200921-Col0-iku2-Timelapse-Seed-Size <ul> <li>Pictures of developing seeds from 0 (ovules) days post-anthesis (DPA) to 10DPA</li> <li>2 genotypes: Col0 and <em>iku2</em></li> </ul> </li> <li>201023-Col0-ede13-Timelapse-Seed-Size <ul> <li>Pictures of developing seeds from 0 (ovules) days post-anthesis (DPA) to 10DPA</li> <li>2 genotypes: Col0 and <em>ede1-3</em></li> </ul> </li> <li>210519-Col0-Timelapse-invitro-Sorbitol <ul> <li>Picture of developing WT seeds (Col-0) at 3, 6, 9 and 12DPA</li> <li>Fruits were grown <em>in planta </em>(uncut) or <em>in vitro</em> from 3DPA onwards</li> <li>Fruits growing <em>in vitro</em> were cultivated in ½ MS + 1% Sucrose + 0.1X PPM (Plant Preservative Medium) + 1X Gamborg Vitamins + 0 to 200mM Sorbitol</li> <li>Note that the file containing the pictures from this experiment was too large for Zenodo, the pictures were thus transformed into 8 bit black/white pictures, a 2x2 binning was applied, before a saving into tiff. The original pictures are available at: <a href="http://flower.ens-lyon.fr/">http://flower.ens-lyon.fr/</a></li> </ul> </li> <li>210709-Col0-Timelapse-invitro-Sorbitol <ul> <li>Picture of developing WT seeds (Col-0) at 3, 6, 9 and 12DPA</li> <li>Fruits were grown <em>in planta </em>(uncut) or <em>in vitro</em> from 3DPA onwards</li> <li>Fruits growing <em>in vitro</em> were cultivated in ½ MS + 1% Sucrose + 0.1X PPM (Plant Preservative Medium) + 1X Gamborg Vitamins + 0 to 200mM Sorbitol</li> <li>Note that the file containing the pictures from this experiment was too large for Zenodo, the pictures were thus transformed into 8 bit black/white pictures, a 2x2 binning was applied, before a saving into tiff. The original pictures are available at: <a href="http://flower.ens-lyon.fr/">http://flower.ens-lyon.fr/</a></li> </ul> </li> <li>data.zip file: <ul> <li>Measurements of seed growth tracking experiments performed on WT plants as well as iku2 and ede1-3 mutants.</li> <li>Measurements of endosperm pressure performed on WT plants and iku2 mutants.</li> <li>Simulation results from a parameter space exploration of the system of ODEs we studied within the scope of the work described in the manuscript.</li> </ul> </li> </ul>
Relationship between Channel Island Melospiza melodia (Song Sparrow) bill size and vegetation, seed extraction time, bite force, and climate (2014-2016)
<p>Inferring the environmental selection pressures responsible for phenotypic variation is a challenge in adaptation studies as traits often have multiple functions and are shaped by complex selection regimes. We provide indirect evidence that morphology of the multifunctional avian bill is primarily shaped by climate and thermoregulatory ability in <em>Melospiza melodia</em> (Song Sparrows) on the California Channel Islands. Our research builds on a study in Song Sparrow museum specimens that demonstrated a positive correlation between bill surface area and maximum temperature, suggesting a greater demand for dry heat dissipation in hotter, xeric environments. We sampled contemporary sparrow populations across three climatically distinct islands to test the hypotheses that bill morphology is influenced by habitat differences with functional consequences for foraging efficiency and is related to maximum temperature and, consequently, important for thermoregulation. Measurements of >500 live individuals indicated a significant, positive relationship between maximum temperature and bill surface area when correcting for body size. In contrast, maximum bite force, seed extraction time, and vegetation on breeding territories (a proxy for food resources) were not significantly associated with bill dimensions. While we cannot exclude the influence of foraging ability and diet on bill morphology, our results are consistent with the hypothesis that variation in Song Sparrows' need for thermoregulatory capacity across the northern Channel Islands selects for divergence in bill surface area.</p>
Dataset: Seed fate, seedling establishment and the role of propagule size in forest regeneration under climate change conditions
<p>This repository contains the files associated with the following article:</p> <p>Badano EI and EJ Sánchez-Montes de Oca. Seed fate, seedling establishment and the role of propagule size in forest regeneration under climate change conditions. <em>Forest ecology and Management</em> 503, Article 119776. <a href="https://doi.org/10.1016/j.foreco.2021.119776">https://doi.org/10.1016/j.foreco.2021.119776</a></p> <p>The first Microsoft Excel file contains a single sheet with the data used to assess whether seed biomass relates with the fresh weight of acorns in the two studied oak species (<em>Quercus viminea</em> and <em>Quercus eduardii</em>). The second Microsoft Excel file contains five sheets with the microclimatic data (photosynthetic photon flux density, air and soil temperature, rainfall and volumetric soil water content) measured at controls under the current climate and climate change simulation plots located in the forest and the abandoned field of each experimental site. The third Microsoft Excel file contains a single sheet with the results of the seed fate experiments. For each oak species, these databases indicate the fresh weight of each acorn and the respective fate of its seed (parasitized by insects, infested by fungi, desiccated or germinated) in controls under the current climate and climate change simulation plots located in forests and abandoned fields. Finally, the fourth Microsoft Excel file contains a single sheet with the results of the seedling development experiments. For each oak species, these databases indicate the fresh weight of each acorn with the respective shoot emergence date of the seedling, the date of seedling dead and the aboveground net growth rate of the seedling in controls under the current climate and climate change simulation plots located in forests and abandoned fields.</p>
Data from: Within-species trait variation can lead to size limitations in seed dispersal of small-fruited plants
<p>The inability of small-gaped animals to consume very large fruits may limit seed dispersal of the respective plants. This has often been shown for large-fruited plant species that remain poorly dispersed when large-gaped animal species are lost due to anthropogenic pressure. Little is known about whether gape-size limitations similarly influence seed dispersal of small-fruited plant species that can show a large variation in fruit size within species.</p> <p>In this study, fruit sizes of 15 plant species were compared with the gape sizes of their 41 animal dispersers in the temperate, old-growth Białowieża Forest, Poland. The effect of gape-size limitations on fruit consumption was assessed at the plant species level, and for a subset of nine plant species, also at the individual level, and subindividual level (i.e., fruits of the same plant individual). In addition, for the species subset, fruit-seed trait relationships were investigated to determine whether a restricted access of small-gaped animals to large fruits results in the dispersal of fewer or smaller seeds per fruit.</p> <p>Fruit sizes widely varied among plant species (74.2%), considerably at the subindividual level (17.1%), and to the smallest extent among plant individuals (8.7%). Key disperser species should be able to consume fruits of all plant species and all individuals (except those of the largest-fruited plant species), even if they are able to consume only 28-55% of available fruits. Fruit and seed traits were positively correlated in eight out of nine plant species, indicating that gape size limitations will result in 49% fewer (in one plant species) or 16-21% smaller seeds (in three plant species) dispersed per fruit by small-gaped than by large-gaped main dispersers, respectively.</p> <p>Our results show that a large subindividual variation in fruit size is characteristic for small-fruited plant species, and increases their connectedness with frugivores at the level of plants species and individuals. Simultaneously, however, the large variation in fruit size leads to gape-size limitations that may induce selective pressures on fruit size if large-gaped dispersers become extinct. This study emphasizes the mechanisms by which gape-size limitation at the species, individual and subindividual level shape plant-frugivore interactions and the co-evolution of small-fruited plants.</p>
Seed size, seed dispersal traits, and plant dispersion patterns for native and introduced grassland plants
<p>Most terrestrial plants disperse by seeds, yet the relationship between seed mass, seed dispersal traits, and plant dispersion is poorly understood. We quantified seed traits for 48 species of native and introduced plants from grasslands of western Montana, USA, to investigate the relationships between seed traits and plant dispersion patterns. Additionally, because the linkage between dispersal traits and dispersion patterns might be stronger for actively dispersing species, we compared these patterns between native and introduced plants. Finally, we evaluated the efficacy of a global trait database, the TRY plant traits database, versus locally collected data for examining these questions.</p> <p>This archive contains species-level data used in analyses, including species metadata (origin, growth form), mean values of measured seed traits (size metrics and type of dispersal structures), two metrics of dispersion (local and broad scales, respectively) derived from grassland surveys in the study region, and information on the seed mass accessed from the TRY traits database. Note that the latter seed mass data could not be included in the archive, but can be acquired directly from the TRY plant traits database (<a href="https://www.try-db.org/TryWeb/Home.php">https://www.try-db.org/TryWeb/Home.php</a>).</p>
Data used in: The causes and consequences of seed size variation in the California-native annual species, Nemophila menziesii
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Data from: Seedling recruitment correlates with seed input across seed sizes: implications for coexistence
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Data from: Within-species trait variation can lead to size limitations in seed dispersal of small-fruited plants
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Data from: Fruit size determines the role of three scatter-hoarding rodents as dispersers or seed predators of a fleshy-fruited Atacama Desert shrub
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Allen Brain Atlas
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Annotated Behaviour and Observability Dataset (ABODe)
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