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13 results for “visitation rate”
Individual and community flowering phenology, seed counts and pollinator visitation rates in shrub and open plots across Niwot Ridge, 2019 - 2021.
Climate-change induced alterations in environmental conditions in the alpine tundra has led to the expansion of woody shrubs, known as “shrubification.” Shrubification is thought to change microclimatic conditions, potentially leading to changes in plant community composition. Shrubification has been taking place at Niwot Ridge, a Long Term Ecological Research site nestled in the mountains of Colorado, for the past 40 years. Thus far, Niwot Ridge has seen some change in alpine plant communities due to shrubification, and changes in plant reproductive capacity and success could lead to future alterations of community composition. One important aspect in plant reproductive success is the timing of flowering, known as flowering phenology. Flowering phenology is controlled partially by environmental conditions, and thus is somewhat plastic for many species. In the first part of my thesis, I explore how shrubification may be causing changes in flowering phenology for 21 different plant species in the alpine tundra community at Niwot Ridge. I conducted an observational study over three years, monitoring the number of flowers present in 54 pairs of shrub-influenced and open plots, totaling 108 plots. I found that there is no difference in the flowering phenology between open and shrub-influenced plots. There is a measurable difference in the number of flowers produced between shrub and open plots, with open plots having more flowers on average, This difference is likely due to there being fewer plants in shrub-influenced plots. A second aspect explores shrub effects on the reproductive success of five different alpine species. In the field season of 2021, I took seeds from these five species from 12 pairs of shrub and open plots, totaling 24 plots. I counted and weighed the seeds to determine reproductive success; there was no difference in reproductive success between shrub and open plots.
Visitation rate of four bee groups within the Calanques National park, Marseille, France
<p>This dataset presents the number of visits and visitation rates realized by four wild bee groups (small bees - < 10-12 mm, large bees > 12 mm, bumblebees and honey bees) on Mediterranean plant species. Data were collected during field surveys taking place from March to June in 2017 and 2018 in the Calanques National Park, Marseille, France on 17 sites.</p> <p>In each site (i.e. 100 m² plots), to maximize the record of bee visitation rates, we first determined the most flowered patches through a visual observation and then we chose the 3 one-square meters most flowered patches to observe plant-bee interactions. An observation consisted in the recording of the visitation rate of each bee group on each plant species in one meter square for 5 minutes per patch in 2017 and 10 minutes per patch in 2018. A session consisted of the sum of observations of all plant-bee interactions on the three one-square-meter patches (i.e. 15 min per plot in 2017 and 30 min per plot in 2018). Nine sessions were performed in 2017 per plot and 5 sessions in 2018 per plot for a total of 135 minutes of observations per plot in 2017 and 150 minutes of observations per plot in 2018. Observations were made between 8h00 and 18h00 and when weather conditions were favorable (no windy or rainy days). </p> <p>Data contains the plant species, the plant family, the site's name, coordinates in WGS84, the date, the week calendar number, the year, the number of visits realized by small bees, large bees, honeybees, bumblebees, period of observation, then visitation rates of each bee group, visited plant richness on each plot each week and cover of each plant species in each site. Each line corresponds to a plant species observed during one observation. Each visit was counted when a bee plunged its head into the flower.</p>
Reduced parental brood visit rate in wild zebra finches (Taeniopygia castanotis) is correlated with high maximum daily ambient temperature
<p>As a result of a warming global climate, understanding how organisms adjust their behaviour to environmental thermal conditions has become an increasingly important question in animal biology. Temperature-driven adjustments in parental care are potentially important given the repercussions on offspring size, quality and survival. In 2015 and 2016, we monitored 83 zebra finch (<em>Taeniopygia</em> <em>castanotis</em>) breeding attempts in the wild. We recorded the frequency of parental visits to the nest together with mean maximum ambient temperature experienced between day 7 and 14 of the nestling period. We found that for each increase of 1 °C in the daytime temperature there was a 0.91% reduction in the hourly rate of parental visits, whilst also accounting for other variables such as nestling age, time of season, and wind speed. Our data suggest that nestlings may receive less food under thermally challenging conditions, which is consistent with recent studies that demonstrate offspring are smaller when reared during periods of high temperature. Understanding the behavioural drivers that may contribute to the production of smaller offspring in extreme heat conditions could prove useful to forecast long-term consequences for fitness triggered by climate change.</p>
Reduced parental brood visit rate in wild zebra finches (Taeniopygia castanotis) is correlated with high maximum daily ambient temperature
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Data from: Pollinator visitation rate and effectiveness vary with flowering phenology
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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: Flower colour and visitation rates of Costus arabicus support the "bee avoidance" hypothesis for red-reflecting hummingbird-pollinated flowers
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Large floral displays increase self-pollination but do not affect visitation rates in Clarkia concinna
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Data from: Frequency dependence of pollinator visitation rates suggests that pollination niches can allow plant species coexistence
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Data from: Relative density and dispersion pattern of two southern African Asteraceae affect fecundity through heterospecific interference and mate availability, not pollinator visitation rate
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Success Rate of Single Versus Two Visit Regenerative Treatment Protocol in Non Vital Mature Anterior Teeth
ClinicalTrials.gov study NCT03717337. IPD Sharing: Not stated. Countries: 0. Publications: 1.
Acute Pain Rate of Single Versus Two-visit Root Canal Treatment of Teeth With Necrotic Pulps
ClinicalTrials.gov study NCT04115904. IPD Sharing: YES. Countries: 1. Publications: 0.
Pre-Anesthesia Visit: Analysis of Coverage Rate of Visit Content and Surgical Patients' Understanding of Information
ClinicalTrials.gov study NCT06735183. IPD Sharing: UNDECIDED. Countries: 1. Publications: 0.
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