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80 results for “nutrient limitations”
Nutrient Limitation of Algal Biomass in Boreal Streams located near the Bonanza Creek LTER in Fairbanks, Alaska - Summer 2022
This dataset contains estimates of chlorophyll-a accumulated on nutrient-diffusing substrata during ~21 d incubation in each of nine streams located in the interior of Alaska near Fairbanks.
Algal Nutrient Limitation Bioassays in Sycamore Creek, Arizona, USA (2010-2020)
The primary objective of this project is to understand how long-term climate variability and change influence the structure and function of desert streams via effects on hydrologic disturbance regimes. Climate and hydrology are intimately linked in arid landscapes; for this reason, desert streams are particularly well suited for both observing and understanding the consequences of climate variability and directional change. Researchers try to (1) determine how climate variability and change over multiple years influence stream biogeomorphic structure (i.e., prevalence and persistence of wetland and gravel-bed ecosystem states) via their influence on factors that control vegetation biomass, and (2) compare interannual variability in within-year successional patterns in ecosystem processes and community structure of primary producers and consumers of two contrasting reach types (wetland and gravel-bed stream reaches). This dataset addresses patterns of nutrient limitation by primary producers as indicated by *in situ* growth on artificial substrates.
Multiple Element Limitation in Northern Hardwood Ecosystems (MELNHE): Sugar Maple Sap Sweetness and Nutrients, and Foliar Gas Exchange and Nutrients, 2013
Sugar maple (Acer saccharum Marsh.) sap sweetness and elemental concentrations, foliar gas exchange, and foliar elemental concentrations were measured in 2013 in Bartlett Experimental Forest stands C6, C8, and C9 and Jeffers Brook stands JBM and JBO. In February and March 2013, sugar maples were sampled for sap sweetness and elemental concentrations of potassium (K), aluminum (Al), calcium (Ca), magnesium (Mg), manganese (Mn), phosphorus (P), and strontium (Sr). In July 2013, leaves from four sugar maple trees per plot, representing the two highest and lowest sap sugar concentrations, were sampled for foliar gas exchange and foliar elemental analyses of Ca, K, Mn, P, nitrogen (N), and silicon (Si). Additional detail on the MELNHE project, including a datatable of site descriptions and a pdf file with the project description and diagram of plot configuration can be found in this data package: https://portal.edirepository.org/nis/mapbrowse?scope=knb-lter-hbr&identifier=344 These data were gathered as part of the Hubbard Brook Ecosystem Study (HBES). The HBES is a collaborative effort at the Hubbard Brook Experimental Forest, which is operated and maintained by the USDA Forest Service, Northern Research Station.
Lake browning generates a spatiotemporal mismatch between DOC and limiting nutrients, 2018 spatial survey, modeled light limitation and whole-lake productivity changes in long-term Adirondack lake survey 1994-2012
This data set contains information on a spatial survey of dissolved organic matter (DOM) across lakes and wetlands in the Northeast and Midwest, USA and modeled long-term changes in light limitation and whole-lake productivity in a suite of lakes in the Adirondack State Park, New York, USA. Widespread long-term increases in DOM have been observed in many lakes in a process known as browning. This data set enables the assessment of potential changes in dissolved absorbance and dissolved organic nutrients associated with browning. This data set accompanies a manuscript in review at Limnology and Oceanography: Letters.
Measurements, from CCE LTER process cruises in the California Current region, of dissolved inorganic concentrations of nutrient iron and of iron limitation at selected stations and depths, 2006 - 2021 (ongoing).
Measurements are made of dissolved iron, total iron and the potential for phytoplankton iron limitation on CCE LTER Process cruises (since 2006, ongoing) in coastal transition zones of the southern California Current System. This is a weak upwelling regime that is relatively low in nutrients and chlorophyll. Changes in phytoplankton (Chla response to Fe+) and nutrient parameters upon iron addition are also investigated.
How nitrogen and phosphorus supply to nutrient-limited autotroph communities affects herbivore growth: testing stoichiometric and co-limitation theory across trophic levels
<p><span>Primary producer communities are often growth-limited by essential nutrients such as nitrogen (N) and phosphorus (P). The magnitude of </span><span>limitation and whether N, P, or both elements are limiting autotroph </span><span>growth depends on the supply and ratios of these essential nutrients. </span><span>Previous studies identified single, serial or co-limitation as predominant </span><span>limitation outcomes in autotroph communities by factorial nutrient </span><span>additions. Little is known about potential consequences of such scenarios </span><span>for herbivores and whether their growth is primarily affected by changes </span><span>in autotroph quantity or nutritional quality. We grew a community of </span><span>phytoplankton species differing in various food quality aspects in </span><span>experimental microcosms at varying N and P concentrations resulting in </span><span>three different N:P ratios. At carrying capacity, N, P, both nutrients or </span><span>none were added to reveal which nutrients were limiting. The nutrient supplied </span><span>communities were fed to the generalist herbivorous rotifer </span><span>Brachionus calyciflorus to investigate how changing phytoplankton </span><span>biomass and community composition affect herbivore abundance. We </span><span>found phytoplankton being growth-limited either by N alone (single </span><span>limitation) or serially, i.e. primarily by N and secondarily by P, altering </span><span>available food quantity for rotifers. Rotifer growth showed a different </span><span>response pattern compared to phytoplankton, suggesting that apart from </span><span>food quantity food quality aspects played a substantial role in the </span><span>transfer from primary to secondary production. The combined addition of </span><span>N and P to phytoplankton had generally a positive effect on herbivore </span><span>growth, whereas adding non-limiting nutrients had a rather detrimental </span><span>effect probably due to stoichiometrically imbalanced food in terms of </span><span>nutrient excess. Our experiment shows that adding various nutrients to </span><span>primary producer communities will not always lead to increased </span><span>autotroph and herbivore growth, and that differences between autotroph </span><span>and herbivore responses under co-limiting conditions can be partly well </span><span>explained by concepts of ecological stoichiometry theory.</span></p>
Elemental and biochemical nutrient limitation of zooplankton: A meta-analysis
<p>Primary consumers in aquatic ecosystems are frequently limited by the quality of their food, often expressed as phytoplankton elemental and biochemical composition. However, effects of these food quality indicators vary across studies, and we lack an integrated understanding of how elemental (e.g., nitrogen, phosphorus) and biochemical (e.g., fatty acid, sterol) limitations interactively influence aquatic food webs. Here we present results of a meta-analysis using >100 experimental studies, confirming that limitation by N, P, fatty acids, and sterols all have significant negative effects on zooplankton performance. However, effects varied by grazer response (growth versus reproduction), specific manipulation, and across taxa. While P limitation had greater effects on zooplankton growth than fatty acids overall, P and fatty acid limitation had equal effects on reproduction. Furthermore, we show that: nutrient co-limitation in zooplankton is strong; effects of essential fatty acid limitation depend on P availability; indirect effects induced by P limitation exceed direct effects of mineral P limitation; and effects of nutrient amendments using laboratory phytoplankton isolates exceed those using natural field communities. Our meta-analysis reconciles contrasting views about the role of various food quality indicators, and their interactions, for zooplankton performance, and provides a mechanistic understanding of trophic transfer in aquatic environments.</p>
Data from: Mast fruiting in a large tropical African legume tree provides evidence for the nutrient resource limitation hypothesis
<p>The large grove-forming tropical tree <em>Microberlinia bisulcata</em> (Fabaceae subfamily Detarioideae) at Korup, Cameroon, shows strong mast fruiting. Reproductive allocation is considerable. The site has very nutrient-poor soil. To test the nutrient resource limitation hypothesis, phenological recordings between 1989 and 2017 were matched with climate variables and analyzed using logistic time-series regression. Masting happened mostly on 2- or 3-year cycles. A strong predictor was mean daily rainfall in the dry season: low in the current year of masting and high in the year prior. Less strongly predictive was the increase in dry season radiation between prior and mast years. Masting events showed no relationship to annual stem increment, nor with local plantation yields. Later, the normally heavy mastings became moderate after two attacks by caterpillars. Collated studies of fallen leaf nutrient concentrations showed that P increased markedly, K rose and fell, but N and Mg changed little, in the inter-mast interval. P and K were likely being accumulated and stored and then triggered masting events when internal thresholds were crossed. The drier season prior to masting enabled a rise in C, and the wetter season the year before, with higher soil moisture, enabled better acquisition and uptake of nutrients by roots and mycorrhizas. The main storage of P may be in bark and branches, that for K on soil organic-colloids. A rooting-fruiting trade-off in C allocated over a minimal 2-year cycle is implied. The hypothesis is that synchrony among masting trees may be achieved, in part, by equilibration of P across the mycorrhizal network. The long-term driver appears to be the inherent year-to-year stochasticity of dry-season rainfall, the realization of which leads to an important refinement of the hypothesis. Life history strategy linked to nutrient resource dynamics provides a plausible explanation and more advanced hypothesis for the masting events observed.</p>
Dataset - Production of polyhydroxybutyrates and carbohydrates in a mixed cyanobacterial culture: effect of nutrients limitation and photoperiods
<p>The data set attached is two excel files where the data from the article <strong>“</strong><strong>Production of polyhydroxybutyrates and carbohydrates in a mixed cyanobacterial culture: effect of nutrients limitation and photoperiods</strong>”, published in New Biotechnology (Vol. 42, 25<sup>th</sup> May 2018, 1-11), can be found, as well as the different equations and formulae that were used to obtain the published results.</p>
Experimental dataset for Browning et al. "Nutrient co-limitation in the subtropical Northwest Pacific"
<p>Experimental dataset for Browning et al. "Nutrient co-limitation in the subtropical Northwest Pacific". Limnology and Oceanography Letters (2021).</p>
How nitrogen and phosphorus supply to nutrient-limited autotroph communities affects herbivore growth: testing stoichiometric and co-limitation theory across trophic levels
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Data from: Mast fruiting in a large tropical African legume tree provides evidence for the nutrient resource limitation hypothesis
Open the record for dataset details and reuse information.
Elemental and biochemical nutrient limitation of zooplankton: A meta-analysis
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Effects of episodic nutrients enrichments on P-limited planktonic communities: Lake Redon ENEX 2013 experiment
<p>Planktonic communities are naturally subjected to episodic nutrient enrichments that may stress or redress the imbalances in limiting nutrients. Human-enhanced atmospheric nitrogen deposition has caused profound N:P imbalance in many remote oligotrophic lakes in which phosphorus has largely become limiting. These lakes offer an opportunity to investigate the planktonic community response to nutrient fluctuations in P-limited conditions. The ENEX experiment in Lake Redon (Pyrenees), performed during August 2013, aimed to investigate the structural and stoichiometric effects of pulse nutrient additions on P-limited planktonic communities. We performed P (PO<sub>4</sub><sup>3-</sup>), and N (NH<sub>4</sub><sup>+</sup> or NO<sub>3</sub><sup>-</sup>) additions to the summer epilimnetic community of the ultraoligotrophic lake using self-filling ~100 L enclosures and analysed the response to varying P availability, N:P imbalance, and N source. The nutrient additions were gradients within the range of values seasonally found in the lake and other oligotrophic lakes of the Pyrenees, with a further P level typical of mesotrophic lakes to provided non-limiting conditions.</p>
Effects of nutrient limitation on the synthesis of N-Rich phytoplankton toxins: a meta-analysis
<p class="MDPI17abstract">Eutrophication has played a major role in the worldwide increase of harmful algal blooms (HABs). Higher input of key nutrients, such as nitrogen (N) and phosphorus (P), can stimulate the growth of harmful algal species in freshwater, estuarine, and coastal marine ecosystems. Some HAB-forming taxa, particularly several cyanobacteria and dinoflagellate species, are harmful through the production of N-rich toxins that have detrimental effects on the environment and human health. Here, we test how changes in nutrient availability affect N-rich toxin synthesis in cyanobacteria and dinoflagellates using a meta-analysis approach. Overall, N-rich toxin content showed an increase with P limitation, while it tended to decrease with N limitation, but we also observed substantial variation in responses both within and across genera and toxin groups. For instance, in response to N limitation, microcystin content varied from a 297% decrease up to a 273% increase, and paralytic shellfish poisoning (PSP) toxin content varied from a 204% decrease to an 82% increase. Cylindrospermopsin, produced by N<sub>2</sub>-fixing cyanobacteria, showed no clear direction in response to nutrient limitation, and cellular contents of this compound may thus vary independently of nutrient fluctuations. Our results confirm earlier reported stoichiometric regulation of N-rich phytoplankton toxins, showing increased toxin content with an increase in cellular N:P ratios, and vice versa. Thus, changes in N-rich toxin content largely follow the changes in relative cellular N content. Consequently, although nutrient limitation may limit bloom biomass and thereby bloom toxicity, our results warn that P limitation can cause accumulation of cellular toxins and thus lead to unexpected increases in bloom toxicity.</p>
Data from: Phytoplankton functional composition determines limitation by nutrients and grazers across a lake productivity gradient
<p>Functional tradeoffs among ecologically important traits govern the diversity of communities and changes in species composition along environmental gradients. A tradeoff between predator defense and resource competitive ability has been invoked as a mechanism that may maintain diversity in lake phytoplankton. Tradeoffs may promote diversity in communities where grazing- and resource-limited taxa coexist, which determines the extent to which communities are resource- or consumer-controlled. In addition, changes in temperature may alter nutrient demands and grazing pressure, changing the balance between the two regulating factors. Our study aims to understand whether a tradeoff between grazer vulnerability and nutrient limitation promotes coexistence of phytoplankton functional groups in communities that differ in trophic status, and how this tradeoff may shift with warming. We conducted multifactorial experiments manipulating grazing, nutrients, and temperature in phytoplankton communities from three Dutch lakes varying in trophic status, and used a trait-based approach to classify functional groups based on grazing susceptibility. <span>We found no associations between susceptibility to grazing and response to nutrient additions in any of the communities or temperature regimes, indicating that</span> a competition-defense tradeoff is unlikely to <span>explain diversity within the tested communities. Instead, w</span>e observed a tendency towards both a higher grazing-resistance and weaker nutrient limitation <span>along with a shift in the functional composition of phytoplankton in communities across a gradient from low to high productivity.</span></p>
Differential nutrient limitation and tree height control leaf physiology, supporting niche partitioning in tropical dipterocarp forests
<p><span>Revealing the mechanisms of environmental niche partitioning within lowland tropical forests is important for understanding the drivers of current species distributions and potential vulnerability to environmental change. Tropical forest structure and species composition change across edaphic gradients in Borneo over short distances. However, our understanding of how edaphic conditions affect tree physiology and whether these relationships drive niche partitioning within Bornean forests remains incomplete. </span></p> <p><span>This study evaluated how leaf physiological function changes with nutrient availability across a fine-scale edaphic gradient and whether these relationships vary according to tree height. Furthermore, we tested whether intraspecific leaf trait variation allows generalist species to populate a wider range of environments.</span></p> <p><span>We measured leaf traits of 218 trees ranging in height from 4 to 66 m from 13 dipterocarp species within four tropical forest types (alluvial, mudstone, sandstone, kerangas) occurring along an < 5km edaphic gradient in North Borneo. The traits measured included saturating photosynthesis (<em>A</em><sub>sat</sub>), maximum photosynthetic capacity (<em>V</em><sub>cmax</sub>), leaf dark respiration (<em>R</em><sub>leaf</sub>), leaf mass per area (LMA), leaf thickness, minimum stomatal conductance (<em>g</em><sub>dark</sub>) and leaf nutrient concentrations (N, P, Ca, K, Mg). </span></p> <p><span>Across all species, leaf traits varied consistently in response to soil nutrient availability across forest types except <em>R</em><sub>leaf_mass</sub>, [<em>Mg</em>]<sub>leaf</sub> and [<em>Ca</em>]<sub>leaf</sub>. Changes in photosynthesis and respiration rates were related to different leaf nutrients across forest types, with greater nutrient-use efficiency in more nutrient-poor environments. Generalist species partially or fully compensated reductions in mass-based photosynthesis through increasing LMA in more nutrient-poor environments. </span></p> <p><span>Leaf traits also varied with tree height, except <em>V</em><sub>cmax_mass</sub>, but only in response to height-related modifications of leaf morphology (LMA and leaf thickness). These height-trait relationships did not vary across the edaphic gradient, except for <em>A</em><sub>sat</sub>, [<em>N</em>]leaf, [<em>P</em>]<sub>leaf</sub> and [<em>K</em>]<sub>leaf</sub>. </span></p> <p><span>Our results highlight that modification of leaf physiological function and morphology act as important adaptations for Bornean dipterocarps in response to edaphic and vertical environmental gradients. Meanwhile, multiple nutrients appear to contribute to niche partitioning and could drive species distributions and high biodiversity within Bornean forest landscapes.</span></p>
Estimates of soil nutrient limitation on the CO2 fertilization effect for tropical vegetation
<p>Data for CO2 fertilization experiments and CMIP6 model simulations used in publication: "Estimates of soil nutrient limitation on the CO2 fertilization effect for tropical vegetation"</p>
Quantitative modelling of nutrient-limited growth of bacterial colonies in microfluidic cultivation
<p>Data for "Quantitative modelling of nutrient-limited growth of bacterial colonies in microfluidic cultivation"</p> <p> </p> <p>GrowthChannelExperiments contains the data-folders of the following growth channel experiments:<br> ***********************************************************************************************</p> <p>Name Feeding Concentration [in units of 0.195mM PCA]<br> nd004_series1 0.5<br> nd004_series2 0.5<br> nd004_series3 0.5<br> nd004_series4 2.0<br> nd004_series5 2.0<br> nd004_series6 2.0<br> nd004_series7 3.0<br> nd004_series8 3.0<br> nd112_series2 0.25<br> nd112_series3 0.25<br> nd112_series7 3.0<br> nd112_series8 3.0</p> <p>Every folder contains:<br> - a tif-file with captured image series<br> - a PIV*-folder with four PIV-files for every frame pair. The four files belong to intermediate results of the multistep PIV. The final PIV-result is given in the file step2*.dat.nmt.<br> The PIV result will be stored in a plain text file. Each line in this file correspond to each PIV vector and comprised of 16 columns:<br> x y ux1 uy1 mag1 ang1 p1 ux2 uy2 mag2 ang2 p2 ux0 uy0 mag0 flag<br> -- (x,y) is the position of the vector (center of the interrogation window).<br> -- ux1, uy1 are the x and y component of the vector (displacement) obtained from the 1st correlation peak.<br> -- mag1 is the magnitude (norm) of the vector.<br> -- ang1, is the angle between the current vector and the vector interpolated from previous PIV iteration.<br> -- p1 is the correlation value of the 1st peak.<br> -- ux2,uy2,mag2,ang2,p2 are the values for the vector obtained from the 2nd correlation peak.<br> -- ux0, uy0, mag0 are the vector value at (x,y) interpolated from previous PIV iteration.<br> -- flag is a column used for mark whether this vector value is interpolated (marked as 999) or switched between 1st and 2nd peak (marked as 21), or invalid (-1). <br> According to the PIV-Fiji-plugin as provided by Qingzong Tseng, used also in : <br> Tseng, Q. et al. Spatial organization of the extracellular matrix regulates cell-cell junction positioning. Proc. Natl. Acad. Sci. 109, 1506–1511 (2012)<br> - two traj*.dat files, belonging to particle positions of the corresponding simulation with monod/teissier uptake. <br> Columns correspond to <br> 1 : time | 2 : cellID | 3 : rx | 4 : ry | 5 : rz | 6: species | 7 : vx | 8 : vy | 9 : vz | 10 : fx | 11 : fy | 12 : fz | 13 : B(g) |<br> -- rx,ry,rz 3D coordinates of particle<br> -- species is either 0 (living cell) or 1 (wall-particle)<br> -- vx,vy,vz 3D velocity of particle<br> -- fx,fy,fz 3D force of particle<br> -- B(g) growth force constant dependent on local g-concentration<br> Note that due to the simulation being 2D, rx=constant and vx=0=fx.<br> - two g*.dat files, belonging to nutrient concentrations of the corresponding simulation with monod/teissier uptake. <br> Columns correspond to <br> 1 : time | 2 : gridx | 3 : gridy | 4 : gridz | 5 : g-conc | 6: kcons | 7 : kprod | 8: Dlocal |<br> -- gridx,gridy,gridz coordinates of lattice side<br> -- kcons local nutrient consumption rate<br> -- kprod local nutrient production rate (always zero)<br> -- Dlocal local diffusion constant</p> <p> </p> <p>GrowthChamberExperiments contains the the data-folders of the following growth chamber experiments:<br> ***************************************************************************************************</p> <p>Name Feeding Concentration [in units of 0.195mM PCA]<br> nd143_xy009 1.0<br> nd143_xy013 1.0<br> nd143_xy025 1.0<br> nd143_xy032 1.0<br> nd143_xy059 1.0<br> nd143_xy060 1.0<br> nd143_xy061 1.0<br> nd143_xy165 0.1<br> nd143_xy184 0.1<br> nd143_xy214 0.1</p> <p>Every folder contains:<br> - a tif-file with captured image series<br> - five traj*.dat files, belonging to particle positions of the corresponding simulation with monod-uptake and five different ratios of the diffusion constants in- and outside the colony.<br> - five g*.dat files, belonging to nutrient concentrations of the corresponding simulation with monod-uptake and five different ratios of the diffusion constants in- and outside the colony.</p>
Knowing your limits: patterns and drivers of nutrient limitation and nutrient-chlorophyll relationships in US lakes (dataset)
<p>Patterns and drivers of nutrient limitation and nutrient-chlorophyll relationships in US lakes</p>
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