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56 results for “pollinator reproduction”
Heterospecific pollen deposition is positively associated with reproductive success in a diverse hummingbird-pollinated plant community
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Data from: Equivocal evidence for a change in balance between selfing and pollinator-mediated reproduction in annual Brassicaceae growing along a rainfall gradient
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Data from: Pollinator-mediated mechanisms for increased reproductive success in early flowering plants
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Agri-environment schemes enhance pollinator richness and abundance but bumblebee reproduction depends on field size
<p>Insect-pollinated plant<strong> </strong>and pollinator data supporting the results reported in the article Geppert et al. (2020).</p>
Data from: Geographic variation of reproductive traits and competition for pollinators in a bird-pollinated plant
Geographic variation in the reproductive traits of animal-pollinated plants can be shaped by spatially variable selection imposed by differences in the local pollination environment. We investigated this in Babiana ringens (Iridaceae), an enigmatic species from the Western Cape region of South Africa. B. ringens has evolved a specialized perch facilitating cross-pollination by sunbirds and displays striking geographic variation in perch size and floral traits. Here, we investigate whether this variation can be explained by geographic differences in the pollinator communities. We measured floral and inflorescence traits, abiotic variables (N, P, C and rainfall) and made observations of sunbirds in populations spanning the range of B. ringens. In each population, we recorded sunbird species identity and measured visitation rates, inter-floral pollen transfer and whether the seed set of flowers was pollen limited. To evaluate whether competition from co-occurring sunbird-pollinated species might reduce visitation, we quantified nectar rewards in B. ringens and of other co-flowering bird-pollinated species in local communities in which populations occurred. Variation in abiotic variables was not associated with geographical variation of traits in B. ringens. Malachite sunbirds were the dominant visitor (97% of visits) and populations with larger-sized traits exhibited higher visitation rates, more between-flower pollen transfer and set more seed. No sunbirds were observed in four populations, all with smaller-sized traits. Sunbird visitation to B. ringens was not associated with local sunbird activity in communities, but sunbird visitation was negatively associated with the amount of B. ringens sugar relative to the availability of alternative nectar sources. Our study provides evidence that B. ringens populations with larger floral traits are visited more frequently by sunbirds and we propose that visitation rates to B. ringens may be influenced, in part, by competition with other sunbird pollinated species.
Data from: When spring ephemerals fail to meet pollinators: mechanism of phenological mismatch and its impact on plant reproduction
The flowering phenology of early-blooming plants is largely determined by snowmelt timing in high-latitude and high-altitude ecosystems. When the synchrony of flowering and pollinator emergence is disturbed by climate change, seed production may be restricted due to insufficient pollination success. We revealed the mechanism of phenological mismatch between a spring ephemeral (Corydalis ambigua) and its pollinator (overwintered bumble bees), and its impact on plant reproduction, based on 19 years of monitoring and a snow removal experiment in a cool-temperate forest in northern Japan. Early snowmelt increased the risk of phenological mismatch under natural conditions. Seed production was limited by pollination success over the three years of pollination experiment and decreased when flowering occurred prior to bee emergence. Similar trends were detected on modification of flowering phenology through snow removal. Following snowmelt, the length of the pre-flowering period strongly depended on the ambient surface temperature, ranging from 4 days (at >7ºC) to 26 days (at 2.5ºC). Flowering onset was explained with an accumulated surface degree-day model. Bumble bees emerged when soil temperature reached 6ºC, which was predictable by an accumulated soil degree-day model, although foraging activity after emergence might depend on air temperature. These results indicate that phenological mismatch tends to occur when snow melts early but subsequent soil warming progresses slowly. Thus, modification of the snowmelt regime could be a major driver disturbing spring phenology in northern ecosystems.
Data from: Nectar robbing impacts pollinator behavior but not plant reproduction
Trait-mediated indirect effects (TMIEs) refer to interactions in which the effect of one species on another is mediated by the behavior of a third species. A mechanistic approach that identifies the direction and impact of TMIEs can shed light on why different net outcomes are observed in the same general phenomena across systems. Nectar robbing has variable net effects through TMIEs on animal-pollinated plants across systems, but the mechanistic steps underlying this range of outcomes are often unclear. To address this knowledge gap, we assessed linkages between nectar robbing, pollinator behavior and plant reproductive success in the Andean tree, Oreocallis grandiflora. We found that robbing in this system led to lower nectar volumes, higher nectar sucrose concentration, and higher nectar viscosity, which together negatively impact nectar quality. This drop in nectar quality was associated with decreased visitation rates by hummingbirds, which might be expected to impact plant reproduction negatively by pollen limitation. However, it was also associated with increased diversity (Shannon's) and evenness in the pollinator community due to reduced visitation by a territorial hummingbird, which might be expected to impact reproduction positively via enhanced genetic diversity of pollen as non-territorial pollinators forage over greater areas. We measured seed set and mass to distinguish the relative intensity of these two possible outcomes, but found no detectable effect. We tentatively conclude that these two consequences of TMIEs may have balanced each other out to yield a neutral net effect of nectar robbing on plant reproduction, though other explanations are also possible. This study highlights ways in which ecologically important TMIEs may act in opposing directions to mask important ecological forces, and underscores the continued need for detailed study of the mechanisms through which TMIEs operate.
Data from: Nectar robbing rather than pollinator availability constrains reproduction of a bee-flowered plant at high elevations
<p>The files contain data on the floral ecology of <em>Clinopodium alpinum</em> collected along an elevational gradient in the Berchtesgaden National Park in Germany in 2017. The data are presented in the work entitled "Nectar robbing rather than pollinator availability constrains reproduction of a bee-flowered plant at high elevations" by Patrick L. Kohl and Ingolf Steffan-Dewenter. Files include data on flower visitor observations (including raw data on the number of visits by individual specifmens), data on seed/ovule ratios (both open pollinated and bagged flowers), data on the incidence of nectar robbing by bumble bees (the frequency of corolla perforations) and of flower herbivory by Eulophidae, and data on basic flowering traits of <em>C. alpinum</em> (number of flowers per inflorescence, corolla tube length, display size).</p>
Pollination and plant reproductive success of two ploidy levels in red clover (Trifolium pratense L.)
<p>This dataset includes hand pollination, honey bee pollination and pollen germination experiments described in the article "Pollination and plant reproductive success of two ploidy levels in red clover (<em>Trifolium pratense</em> L.)", published in Frontiers in Plant Science (DOI: 10.3389/fpls.2021.720069). </p> <p>In a series of hand pollination experiments, the influence of visitation rate (10, 20, 40, 80 pollinated florets per flower head) on the seed number per pollinated floret and seed number per flower head were investigated, respectively. The influence of flowering stage (early, middle, and full flowering) on the seed number per pollinated floret was also investigated. Self-incompatibility was studied by comparing the seed number per flower head under self-pollination and interploidy pollination treatments. In order to study the autonomous pollination, we compared the seed number per flower head between self-pollination and control treatment.</p> <p>In the honey bee pollination experiments, we investigated the overall seed number per floret and compare the number of one-seeded and two-seeded florets in the studied red clover cultivars. Further, we investigated the pollen germination rate of each red clover cultivar. </p> <p>The main findings of this article include: </p> <p>(1) In hand pollination, increasing the visitation rates increased the seed number per flower head, but reduced the seed number per pollinated floret;</p> <p>(2) In hand pollination, different flowering stages did not influence the seed number per pollinated floret significantly;</p> <p>(3) In honey bee pollination, diploid red clover cultivars had more two-seeded florets compared to tetraploids.</p>
Flowering synchrony drives reproductive success in a wind-pollinated tree
Synchronized and quasi-periodic production of seeds by plant populations, known as masting, is implicated in many ecological processes, but how it arises remains poorly understood. Flowering and pollination dynamics are hypothesized to provide the mechanistic link for the observed relationship between weather and population‐level seed production. We report the first experimental test of the phenological synchrony hypotheses as a driver of pollen limitation in mast seeding oaks (Quercus ilex). Higher flowering synchrony yielded greater pollination efficiency, which resulted in 2-fold greater seed set in highly synchronized oaks compared to asynchronous individuals. Pollen addition removed the negative effect of asynchronous flowering on seed set. Because phenological synchrony operates through environmental variation, this result suggests that oak masting is synchronized by exogenous rather than endogenous factors. It also points to a mechanism by which changes in flowering phenology can affect plant reproduction of mast-seeding plants, with subsequent implications for community dynamics.
Data from: Density-dependent dispersal strategy of pollinator moderates the adverse effect of habitat loss on plant reproduction
<p><span>1. </span><span>Major challenges for plant conservation are predicting the effect of habitat loss on pollination success and plant reproduction </span><span>potential</span><span>. Most studies report that pollinator movement is affected by quantitative and spatial characteristics of landscapes. However, little is known about the role of pollinator movement, impacted by floral volatiles and intraspecies interaction, on plant reproduction in fragmented landscapes.</span></p> <p><span>2. </span><span>To clarify the effect of pollinator movement on plant reproduction </span><span>relative to </span><span>habitat loss, we developed an integrated model incorporating pollinator's foraging response with its </span><span>dispersal</span> <span>process mediated by a density-dependent dispersal (DDD) strategy</span><span>.</span> <span>This model</span> <span>performed better in capturing behaviorals response of pollinators than do current methods. The integrated model was verified with field results of pollinator visitation and plant reproduction of saltcedar (<em>Tamarix</em> <em>chinensis</em>) inhabiting the Yellow River Delta, and then was compared against a dispersal strategy called density-independent dispersal (DID). The model was applied to landscapes with various non-habitat percentage (<em>NHP</em>) to explore the effect of habitat loss on plant reproduction.</span></p> <p><span>3. </span><span>Results suggested that saltcedar populations differ in their responses to habitat loss, which depended on the spatial scales considered. At landscape scale, increasing <em>NHP</em> significantly inhibited the dispersion extent of floral volatiles and therefore reduced pollinator visitation and subsequent seed production, especially when <em>NHP</em> exceeded the critical threshold of 0.6.</span> <span>However, at patch scale, comparing with DID strategy, the DDD strategy enabled pollinators to increase their utilization of flowers by 43.42% and 6.79% in low-density and distant plant patches, whereas their utilization was reduced by 7.75% and 2.24% in high-density and central patches, respectively. </span><span>Plant reproduction was improved correspondingly</span> <span>in low-density and distant patches under different <em>NHP</em>s.</span></p> <p><span>4. </span><span>Consequently, habitat loss inhibits the volatiles dispersion and interferes with the foraging success of pollinators, a major factor influencing plant reproduction at landscape scale. At patch scale, adaptive utilization of pollinators exhibiting DDD strategy alleviates the negative effect of habitat loss on plant production and maintains plant population persistence. Since pollinator behavioral response is critical to plant reproduction, we recommend the use of the here-presented integrated model to assess the impact of habitat loss on plant reproduction.</span></p>
Individual flowering phenology shapes plant-pollinator interactions across ecological scales affecting plant reproduction
<p>1. The balance of pollination competition and facilitation amongst co-flowering plants and abiotic resource availability can modify plant species and individual reproduction. Floral resource succession and spatial heterogeneity modulate plant-pollinator interactions across ecological scales (individual plant, local assemblage, interaction network of agroecological infrastructure across the farm). Intraspecific variation in flowering phenology can modulate the precise level of spatio-temporal heterogeneity in floral resources, pollen donor density and pollinator interactions that a plant individual is exposed to, thereby affecting reproduction.</p> <p>2. We tested how abiotic resources and multi-scale plant-pollinator interactions affected individual plant seed set, modulated by intraspecific variation in flowering phenology and spatio-temporal floral heterogeneity arising from agroecological infrastructure. We transplanted two focal insect-pollinated plant species (<em>Cyanus</em> <em>segetum</em> and <em>Centaurea</em> <em>jacea</em>, n = 288) into agroecological infrastructure (10 sown wildflower, 6 legume-grass strips) across a farm-scale experiment (125 ha).</p> <p>3. We applied an individual-based phenologically explicit approach to match precisely the flowering period of plant individuals to the concomitant level of spatio-temporal heterogeneity in plant-pollinator interactions, potential pollen donors, floral resources and abiotic conditions (temperature, water, nitrogen).</p> <p>4. Individual plant attractiveness, assemblage floral density and conspecific pollen donor density (<em>C</em>. <em>jacea</em>) improved seed set. Network linkage density increased focal species' seed set and modified the effect of local assemblage richness and abundance on <em>C</em>. <em>segetum</em>. Mutual dependence on pollinators in networks increased <em>C</em>. <em>segetum</em> seed set, while <em>C</em>. <em>jacea</em> seed set was greatest where both specialization on pollinators and mutual dependence was high. Abiotic conditions were of little or no importance to seed set.</p> <p>5. Intra- and interspecific plant-pollinator interactions respond to spatio-temporal heterogeneity arising from agroecological management affecting wild plant species reproduction. The interplay of pollinator interactions within and between ecological scales affecting seed set implies a co-occurrence of pollinator-mediated facilitative and competitive interactions among plant species and individuals. </p>
Pollinator asynchrony drives the temporal stability of flower visitation rates, but not of plant reproductive success
<p>Data and code of the article titled " Pollinator asynchrony drives the temporal stability of flower visitation rates, but not of plant reproductive success" by Estefanía Tobajas, Virginia Domínguez-García, Francisco P. Molina and Ignasi Bartomeus</p>
Data from: Pollinator specificity drives strong prepollination reproductive isolation in sympatric sexually deceptive orchids
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Pollination and plant reproductive success of two ploidy levels in red clover (Trifolium pratense L.)
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Data from: Pollination biology and reproductive phenology of the federally endangered endemic Physaria globosa (Brassicaceae) in Tennessee
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Data from: Nectar robbing rather than pollinator availability constrains reproduction of a bee-flowered plant at high elevations
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Data from: Nectar robbing impacts pollinator behavior but not plant reproduction
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Data from: Geographic variation of reproductive traits and competition for pollinators in a bird-pollinated plant
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Data from: Influence of plant reproductive systems on the evolution of hummingbird pollination
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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.