Find research datasets worth reusing
Search datasets from major research repositories and use ShareScore to quickly assess how well each record supports discovery, access, and reuse.
67
datasets available to search
ShareScore release 0.9.0
Dataset results
67 results for “Pollen analysis”
Text-fig. 10. Scanning electron microscope (SEM) images of conifer seeds (a, b) and pollen (c) and monoporate pollen of unknown affinity (d–j); Torres Vedras locality, Portugal. a, b) Unnamed conifer seeds (conifer seed sp. 1); c) Clump of bisaccate pollen grains; d) Fragment with microsporangia that yielded the pollen in (e–j); e, f, h) Monoporate pollen grains folded in various ways, exposing the tiny pore (e, h, arrowheads) or resembling a monocolpate grain (f); g) Detail of pollen grain showing pore (arrowhead) and finely rugulate exine surface that reflects the reticulate infratectal layer beneath the thin tectum; i) Detail of pore showing very slightly thickened margin; j) Spherical orbicules on the surface of two grains. Specimens, TV44-S174594 (a), TV44-S174595 (b), TV44-S174573 (c), TV44-S137904 (d–j). Scale bars 1 mm (a, b), 300 Μm (d), 100 Μm (c), 6 Μm (e, f, h), 3 Μm (g, j), 1.5 Μm (i). in The Early Cretaceous Mesofossil Flora Of Torres Vedras (Ne Of Forte Da Forca), Portugal: A Palaeofloristic Analysis Of An Early Angiosperm Community
Text-fig. 10. Scanning electron microscope (SEM) images of conifer seeds (a, b) and pollen (c) and monoporate pollen of unknown affinity (d–j); Torres Vedras locality, Portugal. a, b) Unnamed conifer seeds (conifer seed sp. 1); c) Clump of bisaccate pollen grains; d) Fragment with microsporangia that yielded the pollen in (e–j); e, f, h) Monoporate pollen grains folded in various ways, exposing the tiny pore (e, h, arrowheads) or resembling a monocolpate grain (f); g) Detail of pollen grain showing pore (arrowhead) and finely rugulate exine surface that reflects the reticulate infratectal layer beneath the thin tectum; i) Detail of pore showing very slightly thickened margin; j) Spherical orbicules on the surface of two grains. Specimens, TV44-S174594 (a), TV44-S174595 (b), TV44-S174573 (c), TV44-S137904 (d–j). Scale bars 1 mm (a, b), 300 Μm (d), 100 Μm (c), 6 Μm (e, f, h), 3 Μm (g, j), 1.5 Μm (i).
Analysis of anthropogenic influence on pollen based climate research
<p>In paleoclimatology the relationships between vegetation and climate are used to infer past climate from plant fossils. However, if a transfer function is tested on modern pollen and climate observations, there is a mismatch between observed and inferred climate. Several causes for such a mismatch have been identified by literature, but this research focusses on humans. Humans influence community assembly of vegetation, but the effect of this influence on climatic studies is not well investigated. The aim of this research was to assess anthropogenic influence on climatic mismatch.</p> <p>Data was collected from previous research on 29 Amazonian sites. This was run through a transfer function and mismatch was calculated for the mean annual temperature, mean diurnal range and annual precipitation. Linear regression tests were used to test the data on a correlation between human influence (land use and distances to features) and mismatch.</p> <p>Mismatch decreased at first and then increased in the opposite direction. There is evidence that precipitation is affected by humans. Of all considered measures the distance to the nearest hardened road had the strongest relationship with induced mismatch.</p> <p> </p> <p>This file contains all used data and R scripts. With the contents the results can be recreated. Instructions on use are enclosed</p>
Results of CNN-based pollen analysis
Open the record for dataset details and reuse information.
Data from: Paternity analysis reveals wide pollen dispersal and high multiple paternity in a small isolated population of the bird-pollinated Eucalyptus caesia (Myrtaceae)
Optimal foraging behaviour by nectavores is expected to result in a leptokurtic pollen dispersal distribution and predominantly near-neighbour mating. However, complex social interactions among nectarivorous birds may result in different mating patterns to those typically observed in insect-pollinated plants. Mating system, realised pollen dispersal and spatial genetic structure were examined in the bird-pollinated Eucalyptus caesia, a species characterised by small, geographically disjunct populations. Nine microsatellite markers were used to genotype an entire adult stand and 181 seeds from 28 capsules collected from 6 trees. Mating system analysis using MLTR revealed moderate to high outcrossing (tm=0.479–0.806) and low estimates of correlated paternity (rp=0.136±s.e. 0.048). Paternity analysis revealed high outcrossing rates (mean=0.72) and high multiple paternity, with 64 different sires identified for 181 seeds. There was a significant negative relationship between the frequency of outcross mating and distance between mating pairs. Realised mating events were more frequent than expected with random mating for plants <40 m apart. The overall distribution of pollen dispersal distances was platykurtic. Despite extensive pollen dispersal within the stand, three genetic clusters were detected by STRUCTURE analysis. These genetic clusters were strongly differentiated yet geographically interspersed, hypothesised to be a consequence of rare recruitment events coupled with extreme longevity. We suggest that extensive polyandry and pollen dispersal is a consequence of pollination by highly mobile honeyeaters and may buffer E. caesia against the loss of genetic diversity predicted for small and genetically isolated populations.
Fig. 3 in The oligolecty status of a specialist bee of South American Prosopis (Fabaceae) supported by pollen analysis and floral visitation methods
Fig. 3 An inflorescence of Prosopis alba among a great quantity of well developed leaves, photographed in late November. The light green-yellowish flowers are densely distributed in the spike-like inflorescence. An unripe fruit is shown
Fig. 1 in The oligolecty status of a specialist bee of South American Prosopis (Fabaceae) supported by pollen analysis and floral visitation methods
Fig. 1 South American Chaco region indicating the Chaco province of Argentina and localities where nests and pollen samples were obtained. 1 Villa Río Bermejito (25° 37′ S, 60° 15′ W); 2 Juan José Castelli (25° 56′ S, 60° 37′ W)
Combined transcriptomics and metabolomics analysis reveals the mechanism behind the pollen abortion in early stage among male sterile lines of alfalfa
<p><span>This study investigates early-stage anther development in cytoplasmic male sterile (CMS) alfalfa lines (MSJN1A) compared to their isotypic maintainer line (MSJN1B). Histological analyses revealed abnormal degradation of tapetal cells post-meiosis in the CMS line. Notably, during the early mononuclear stage, the central vacuole in the microspores was absent, leading to evident pollen abortion. These findings suggest that pollen abortion in the CMS line is associated with the delayed disintegration of the tapetum and structural anomalies in microspore vacuoles.</span><span> </span><span>Non-targeted metabolomic sequencing was employed to analyze the early anther metabolites of alfalfa, identifying four hundred and one and four hundred and five metabolites in the late tetrad and early mononuclear stages, respectively. Among these, thirty-nine metabolites were consistently up-regulated, while eighty-eight were down-regulated. Differential analysis revealed forty-five and thirty-seven unique metabolites in each respective stage. These metabolites primarily featured in pathways related to energy, phenylpropane, sucrose and starch, and fatty acid metabolism. Integrated analysis demonstrated that differentially expressed genes (DEGs) and differential metabolites (DMs) were co-enriched in these pathways. Additionally, quantitative real-time PCR and physiological index analysis confirmed the down-regulation of key genes during anther development, illustrating that changes in gene regulation upstream could significantly impact downstream metabolite levels, ultimately influencing pollen fertility.</span></p>
FIGURES 7–12 in Character analysis of adaptations for tarsal pollen collection in the Bombyliidae (Insecta: Diptera): the benefits of putting your foot in your mouth
FIGURES 7–12. Female tarsal setae of Bombyliidae. 7. Poecilognathus sulphureus, spatulate setae, 2000 x. 8. P. sulphureus, lateral view tarsomeres 3, 4, and 5 with microtrichia, normal setae and apicoventral spatulate setae, 300 x. 9. Hemipenthes jaennickeana, apex foretarsal spatulate setae, 2660 x. 10. Exoprosopa eremita, distal tarsomeres and pretarsus with weakly spatulate setae, 270 x. 11. H. jaennickeana, foretarsal spatulate setae plus microtrichia, 990 x. 12. P. lucifer, lateral view of foretarsomere 2 with elongate, weakly clavate setae, 160 x.
FIGURES 2–6 in Character analysis of adaptations for tarsal pollen collection in the Bombyliidae (Insecta: Diptera): the benefits of putting your foot in your mouth
FIGURES 2–6. Female tarsal setae of Bombyliidae. 2. Neodiplocampta paradoxa, foretarsus with capitate setae, 231 x. 3. Dipalta serpentina, apex of foretarsal capitate seta, 800 x. 4. Dipalta serpentina, foretarsal capitate setae plus microtrichia, 800 x. 5. Neodiplocampta paradoxa, foretarsus plus apex of tibia, 63 x. 6. Bombylius major, tarsomere 5 and pretarsus of foreleg with lanceolate setae, 370 x.
FIGURE 1 in Character analysis of adaptations for tarsal pollen collection in the Bombyliidae (Insecta: Diptera): the benefits of putting your foot in your mouth
FIGURE 1. Female of Hemipenthes jaennickeana on staminatephase flower of Sabatia campestris. A. Right foretarsi stroking dehiscing anther. B. Right foreleg transferring pollen to labellum.
Data from: Paternity analysis reveals wide pollen dispersal and high multiple paternity in a small isolated population of the bird-pollinated Eucalyptus caesia (Myrtaceae)
Open the record for dataset details and reuse information.
Data from: The gravity of pollination: integrating at-site features into spatial analysis of contemporary pollen movement.
Open the record for dataset details and reuse information.
Data from: Molecular and pollen-based vegetation analysis in lake sediments from central Scandinavia
Open the record for dataset details and reuse information.
Larger pollinators deposit more pollen on stigmas across multiple plant species – a meta-analysis
<p>Abstract</p> <p><b>1.</b> Many insect species provide essential pollination services. However, the amount of pollen deposited onto a stigma when visiting a flower ("single visit pollen deposition", SVD) can vary greatly among taxa depending on morphological traits of pollinators. Further, SVD is commonly measured using one of two methods ('static': waiting for an insect to visit a flower present on plant, and 'active': removing the flower and presenting it to a flower visitor) that may also differ in their effectiveness.</p> <p><b>2.</b> To gain a more comprehensive understanding of how SVD compares among pollinators, we conducted a hierarchical meta-analysis using data from 28 studies identified by a systematic review. These contained SVD data for 94 bee and 33 fly taxa (hereafter "wild pollinators"), across 30 plant species from which we included 127 observations. In the analysis of each study, we used the western honey bee (<i>Apis mellifera</i>) as a comparator species.</p> <p><b>3.</b> Wild pollinators deposited more pollen onto stigmas per single visit than honeybees, and those with larger body deposited significantly more pollen than smaller ones. Of the two methodological approaches to assess SVD, 'static' versus 'active', we found no significant difference regarding the amount of deposited pollen.</p> <p><b>4.</b> <i>Synthesis and applications. </i>Our meta-analysis highlights the breadth of wild pollinators that contribute to pollination effectiveness via their delivery of pollen to many crop and non-crop plant species. However, just 25% of the observations assessed the amount of pollen deposited by fly species. Our findings point to the need to further quantify the pollination effectiveness of non-bee pollinators as studies have largely focused on managed and wild bee species.</p>
Larger pollinators deposit more pollen on stigmas across multiple plant species – a meta-analysis
Open the record for dataset details and reuse information.
Transcriptome analysis of heat stressed Nicotiana tabacum pollen tubes
GEO Series GSE153474. Nicotiana tabacum. 9 samples. Type: Expression profiling by high throughput sequencing.
Gene expression analysis of nasal mucosa in birch pollen allergic and non-allergic individuals upon nasal provocation with birch pollen
GEO Series GSE261239. Homo sapiens. 46 samples. Type: Expression profiling by high throughput sequencing.
Analysis of small RNAs revealed differential expressions during the development of pollen and embryo sac and their targets may associate with fertility in autotetraploid rice
GEO Series GSE90479. Oryza sativa Japonica Group. 16 samples. Type: Non-coding RNA profiling by high throughput sequencing.
Whole genome analysis of pollen-pistil interactions in Arabidopsis thaliana: time course
GEO Series GSE27281. Arabidopsis thaliana. 10 samples. Type: Expression profiling by array.
Comparative small RNA analysis of pollen development in autotetraploid and diploid rice
GEO Series GSE79344. Oryza sativa Japonica Group. 6 samples. Type: Non-coding RNA profiling by high throughput sequencing.
ScienceDex guides
Understand access before you commit
These curated guides explain access requirements, typical timelines, costs, and reuse considerations for widely used research datasets.
Allen Brain Atlas
Allen Brain Atlas is an Allen Institute collection of brain map atlases, datasets, APIs, and analysis tools covering mouse, human, and non-human primate brain resources.
Annotated Behaviour and Observability Dataset (ABODe)
ABODe is a University of Edinburgh DataShare dataset for behavior classification in group-housed mice using home-cage video, identities, bounding boxes, ground-plate positions, and annotator labels.
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.