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301 results for “bloom”
Data from: Shifts in growth light optima among diatom species support their succession during the spring bloom in the Arctic
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Supporting data for: Physical controls and ecological implications of the timing of the spring phytoplankton bloom on the Newfoundland and Labrador shelf
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Bee diversity and abundance during peach bloom in South Carolina, United States
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Disease management during bloom affects the floral microbiome but not pollination in a mass-flowering crop
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Dataset on how mesopredator-mediated trophic cascade can break persistent phytoplankton blooms in coastal waters
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A model investigation of the influences of the South-East Madagascar Current on the South-East Madagascar Bloom
<p>These data can be used to reproduce the figures of the scientific article entitled 'A model investigation of the influences of the South-East Madagascar Current on the South-East Madagascar Bloom.'</p>
Dataset for: Sensitivity of a satellite algorithm for harmful algal blooms discrimination to the use of laboratory bio-optical data for training
<p>Two files relating to the publication by Martinez-Vicente et al. (2020).</p> <p>meris_data_karenia_alt_chla.xlsx : file containing the chlorophyll concentrations for the different areas in the MODIS images selected for training and evaluation of the algorithm.</p> <p>coefficients_for_LDA_Karenia_mikimotoi.zip: file containing the coefficients for the Linear Discriminant Analysis (LDA) resulting from the training datasets 1,2 and 3. </p> <p> </p>
Replication Package for Bloom, Draca and Van Reenen (2021) "A Reply to Campbell and Mau"
<p>Replication File for Review of Economic Studies manuscript 28949-2 "A Reply to Campbell and Mau"</p>
Data from: Ecological drivers of jellyfish blooms – the complex life history of a 'well-known' medusa (Aurelia aurita)
<ol> <li>Jellyfish blooms are conspicuous demographic events with significant ecological and socio-economic impact. Despite worldwide concern about an increased frequency and intensity of such mass occurrences, predicting their booms and busts remains challenging.</li> <li>Forecasting how jellyfish populations may respond to environmental change requires considering their complex life histories. Metagenic life cycles, which include a benthic polyp stage, can boost jellyfish mass occurrences via asexual recruitment of pelagic medusae.</li> <li>Here we present stage-structured matrix population models with monthly, individual-based demographic rates of all life stages of the moon jellyfish <i>Aurelia aurita</i> L. (<em>sensu stricto</em>). We investigate the life stage-dynamics of these complex populations under low and high food conditions to illustrate how changes in medusa density depend on non-medusa stage dynamics.</li> <li>We show that increased food availability can be an important ecological driver of jellyfish mass occurrences, as it can temporarily shift the population structure from polyp- to medusa- dominated. Projecting populations for a winter warming scenario enhanced the booms and busts of jellyfish blooms.</li> <li>We identify demographic key variables that control the intensity and frequency of jellyfish blooms in response to environmental drivers such as habitat eutrophication and climate change. By contributing to an improved understanding of mass occurrence phenomena, our findings provide perspective for future management of ecosystem health.</li> </ol>
Macroalgal blooms caused by marine nutrient changes resulting from human activities
<p>1. Macroalgal blooms (green tides) are occurring more frequently in many regions of the world, leading to significant impacts on marine ecology and economies. Although many studies and hypotheses have been proposed, the exact mechanism of green tide formation remains unclear. 2. The world's largest green tides recur in the Yellow Sea and this area is representative for studying the origin and mechanism of green tide formation. We conducted a meta-analysis of studies related to green tides and associated hypotheses for their formation. 3. Rapid industrialization/urbanization and environmental protection actions in coastal zones have led to an increase in nitrate (nitrite) and decline in ammonium (ammonia), and this has resulted in increasing levels of dissolved inorganic nitrogen in seawater. 4. We found that presence of appropriate attachment substrates for Ulva including laver culture rafts and certain hydrological conditions are supplementary factors to green tide formation in the Yellow Sea. 5. Changes in marine nutrient levels promote the production of nitric oxide, which is essential for Ulva sporulation. Consequently, numerous spores are created and attach to substrates including laver culture rafts and parent Ulva thalli. These spores then develop into new thalli that are capable of producing further spores. As a result, Ulva thalli rapidly occupy vast areas of the sea and develop into green tides. 6. Synthesis and applications. Our synthesis identifies that escalating marine nitric oxide generation caused by various factors and its essential role in Ulva sporulation are underlying and significant components in the mechanism of green tide formation. We provide solutions such as the improvement of comprehensive management of aquaculture and strict restriction of marine nitrate pollution, to prevent green tides. Furthermore, we propose an innovative wastewater treatment programme combined with Ulva application to fulfil the standard of sustainable development and circular economy.</p>
Data from: A hypervariable mitochondrial protein coding sequence associated with geographical origin in a cosmopolitan bloom-forming alga, Heterosigma akashiwo
Geographic distributions of phytoplankton species can be defined by events on both evolutionary time and shorter scales, e.g., recent climate changes. Additionally, modern industrial activity, including the transport of live fish and spat for aquaculture and aquatic microorganisms in ship ballast water, may aid the spread of phytoplankton. Obtaining a reliable marker is key to gaining insight into the phylogeographic history of a species. Here, we report a hypervariable mitochondrial gene in the cosmopolitan bloom-forming alga, Heterosigma akashiwo. We compared the entire mitochondrial genome sequences of seven H. akashiwo strains from Japanese and North American coastal waters and identified a hypervariable segment. The region codes for a hypothetical protein with no defined function, and its variations between Japanese and North American isolates, were prominent, while the sequences were more conserved among Japanese strains and North American isolates. Comparison of the sequence in isolates obtained from different geographical points in the Northern Hemisphere revealed that the sequence variations largely correlated with latitude and longitude (i.e. Pacific/Atlantic oceans). Our results demonstrate the usefulness of the sequence in determining the phylogeographic history of H. akashiwo.
Data from: Rehabilitating the cyanobacteria – niche partitioning, resource use efficiency, and phytoplankton community structure during diazotrophic cyanobacterial blooms
1. Blooms of nitrogen-fixing cyanobacteria are recurrent phenomena in marine and freshwater habitats, and their supplying role in aquatic biogeochemical cycles is generally considered vital. The objective of this study is to analyze if an increasing proportion of nitrogen-fixing cyanobacteria affects (i) the composition of the non-diazotrophic component of ambient phytoplankton communities, and (ii) resource use efficiency (RUE; ratio of chl a to total nutrients) – an important ecosystem function. We hypothesize that diazotrophs increase community P use, and decrease N use efficiencies, as new N is brought into the system, relaxing N, and concomitantly aggravating P limitation. We test this by analyzing an extensive dataset from the Baltic Sea (> 3700 quantitative phytoplankton samples), known to harbor conspicuous and recurrent blooms of Nodularia spumigena and Aphanizomenon sp. 2. System-level phosphorus use efficiency (RUEP) was positively related with high proportion of diazotrophic cyanobacteria, suggesting aggravation of phosphorus limitation. However, concomitant decrease of nitrogen use efficiency (RUEN) was not observed. Nodularia spumigena, a dominant diazotroph and a notorious toxin producer, had a significantly stronger relationship with RUEP, compared to the competing non-toxic Aphanizomenon sp., confirming niche differentiation in P acquisition strategies between the major bloom-forming cyanobacterial species in the Baltic Sea. Nodularia occurrences were associated with stronger temperature stratification in more offshore environments, indicating higher reliance on in situ P regeneration. 3. By using constrained and unconstrained ordination, permutational multivariate analysis of variance, and local similarity analysis, we show that diazotrophic cyanobacteria explained no more than a few percent of the ambient phytoplankton community variation. The analyses furthermore yielded rather evenly distributed negative and positive effects on individual co-occurring phytoplankton taxa, with no obvious phylogenetic or functional trait-based patterns. 4. Synthesis. Our study reveals that despite the widely acknowledged noxious impacts of cyanobacterial blooms, the overall effect on phytoplankton community structure is minor. There are no predominantly positive or negative associations with ambient phytoplankton species. Species-specific niche differences in cyanobacterial resource acquisition affect important ecosystem functions, like biomass production per unit limiting resource.
Figure 7 in A bloom of the green worm Phyllodoce tuberculosa Kudenov, 1975 in a beach of the Southern Gulf of California, Mexico (Annelida, Errantia, Phyllodocidae)
Figure 7. Preserved specimens of Phyllodoce tuberculosa. (a) Anterior end, oblique dorsal view; (b) prostomium and nuchal papillae; (c) tubercles in mid-body segments (indicated by arrows); (d) parapodium from anterior segment; (e) parapodium from mid-body segment; (f) parapodium from a posterior segment. (a) Live specimen; (b–f) fixed specimen; (b) stained with Shirlastain-A; (c–e) unstained. Scale bars: a = 1 mm; b–c = 0.5 mm; d–f = 0.4 mm.
Figure 3 in A bloom of the green worm Phyllodoce tuberculosa Kudenov, 1975 in a beach of the Southern Gulf of California, Mexico (Annelida, Errantia, Phyllodocidae)
Figure 3. Micrographs of live, relaxed specimens of Phyllodoce tuberculosa in dorsal view. (a) Worm with pharynx not everted; (b) worm with partially exposed pharynx; (c) mid-body segments. Scale bars: 1 mm.
Figure 6 in A bloom of the green worm Phyllodoce tuberculosa Kudenov, 1975 in a beach of the Southern Gulf of California, Mexico (Annelida, Errantia, Phyllodocidae)
Figure 6. Preserved specimens of Phyllodoce tuberculosa stained with Shirlastain-A. (a) Anterior end, pharynx fully exposed, dorsal view; (b) same, ventral view; (c) transversal section of basal half of proboscis; (d) pharynx tip, frontal view, showing distal papillae. Scale bars: a, b, d = 1 mm; c = 0.5 mm.
Figure 2 in A bloom of the green worm Phyllodoce tuberculosa Kudenov, 1975 in a beach of the Southern Gulf of California, Mexico (Annelida, Errantia, Phyllodocidae)
Figure 2. Specimens of Phyllodoce tuberculosa during low tide in Playa Norte, Mazatlán, Southern Gulf of California. (a) Panoramic view and use of quadrant; (b) mucus trails; (c) green single worm, detail of (b). Scale bars: a = 5 cm; b = 10 cm; c = 3 cm.
Figure 4 in A bloom of the green worm Phyllodoce tuberculosa Kudenov, 1975 in a beach of the Southern Gulf of California, Mexico (Annelida, Errantia, Phyllodocidae)
Figure 4. Micrographs of live, relaxed specimens of Phyllodoce tuberculosa. (a) Prostomium and anterior segments, ventral view; (b) mid-body segments, ventral view; (c) male, parapodia from mid-body segments, lateral view; (d) spermatozoa. Scale bars: a–c = 0.8 mm; d = not scaled, magnification 1000X.
Figure 5 in A bloom of the green worm Phyllodoce tuberculosa Kudenov, 1975 in a beach of the Southern Gulf of California, Mexico (Annelida, Errantia, Phyllodocidae)
Figure 5. Micrographs of parapodia and dorsal cirri of Phyllodoce tuberculosa. (a) Female, parapodia of mid-body segments full of oocytes (indicated with arrows); (b) dorsal cirri of anterior segments; (c) dorsal cirri of mid-body segments; (d) dorsal cirri of posterior segments, and pygidial cirri. (a–c) Live, relaxed specimens; (d) fixed specimen stained with Shirlastain-A, dorsal view. Scale bars: a = 1.5 mm; b, d = 0.5 mm; c = 1 mm.
Data and code for Causality analysis and prediction of riverine algal blooms by combining empirical dynamic modeling and machine learning techniques
<p>Hydrological data (including daily water levels, flow velocities, and streamflow discharges) from two hydrological stations, the Hankou Station in the Yangtze River (YR) and the Hanchuan Station in the Han River (HR), were obtained from Hubei Province Hydrology and Water Resources Center.</p> <p>Water quality data (i.e., total nitrogen (TOTN), total phosphorus (TOTP), and water temperature in the Han River) and algae densities at three sections (Baihezui, Qinduankou and Zongguan) were acquired from the Yangtze River Basin Ecological and Environmental Supervision Authority. </p> <p><span>The R script(s) for machine learning models can also be found at <a href="../api/records/10901736/draft/files/Code%20for%20machine%20learning%20classification%20model.R/content" target="_blank" rel="noopener noreferrer">Code for machine learning classification model.R</a>.</span></p> <p> </p>
Figure 4 in Limited response of a spring bloom community inoculated with filamentous cyanobacteria to elevated temperature and pCO
Figure 4: Biovolume (mm3 l−1) of phytoplankton in different temperature and pCO2 treatments (a: 1°C 390 µatm, b: 1°C 970 µatm, c: 4°C 390 µatm, and d: 4°C 970 µatm). (A) Biovolume of filamentous cyanobacteria. (B) Biovolume of ciliates, dinoflagellates, pennate diatoms and centric diatoms. Error bars indicate standard deviation, n = 3.
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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)
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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.