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91 results for “Phaeophyceae”
Seasonal ecophysiology of Fucus vesiculosus (Phaeophyceae) in the Northern Baltic Sea
<p>This dataset contains ecophysiological measurements of brown algae <em>Fucus vesiculosus</em> and environmental variables, measured in different seasons in 2017 in the Northern Baltic Sea, SW Finland. More specifically, the measured parameters include in situ chlorophyll <em>a</em> fluorescence: F<sub>v</sub>/F<sub>m</sub>, maximum relative electron transport rate, and quantum yield of photochemistry. Carbon and nitrogen content, carbon:nitrogen ratio and chlorophyll <em>a</em> and <em>c</em> content were determined in the laboratory. Environmental parameters monitored include in situ irradiance, temperature, salinity, alkalinity, DIC, pCO<sub>2</sub>, HCO<sub>3</sub><sup>-</sup>, CO<sub>3</sub><sup>2-</sup>, CO<sub>2</sub>, seawater nitrogen (NO<sub>2</sub><sup>-</sup> and NO<sub>3</sub><sup>-</sup>) and phosphorus (PO<sub>4</sub><sup>3-</sup>). Measurements were conducted in February, May, July, September and November in two sites, with additional three sites sampled in July. Irradiance was measured with 1 meter depth intervals from the surface. Irradiance values in the data are irradiances at <em>F. vesiculosus</em> sampling depths in each site, estimated with linear regression from the irradiance and depth data. F<sub>v</sub>/F<sub>m</sub> values for sites Spikarna, Ekö and Björnholmen in July were imputed from other variables using R package "Amelia". </p>
Genetic diversity of a marine foundation species, Laminaria hyperborea (Phaeophyceae Laminariales), along the coast of Ireland
<p><span><span><span><span><span><span><span><span><span><span><span>Worldwide, kelp populations are stressed by warming, increased storms and other man-driven disturbances<i>. </i>Marine population distributions are projected to retreat poleward with climate change if they cannot adapt to changing conditions, which would potentially lead to a regime shift in subtidal habitats. In Northern Europe, <i>Laminaria hyperborea</i>is a subtidal ecosystem engineer whose distribution has shifted over millennia, leaving predicted areas of high genetic diversity from the last glacial maximum (LGM) near its southern distribution limit in the Iberian Peninsula. In Ireland, <i>L. hyperborea </i>structures communities by supporting diverse faunal assemblages and producing large quantities of organic carbon throughout the year. We investigated the genetic diversity of eight populations ranging from the southern coast to the northwest of Ireland using nine microsatellite loci. Diversity was found to be highest in Lough Hyne, a Special Area of Conservation (SAC), near the predicted climate refugium. We found evidence of isolation by distance, with high connectivity between populations that were geographically close, likely driven by short range dispersal of <i>L. hyperborea</i>propagules. Genetic diversity (measured as expected heterozygosity and allelic richness) was highest at Lough Hyne, and decreased northwards, as predicted from past range shifts. Expected heterozygosity was highest at Lough Hyne (0.706) and decreased northward, with the lowest value at Bridges of Ross (0.283). Based on these patterns, further fine-scale investigation into population diversity, dispersal and potential resilience in Irish kelp forests are necessary as warming and non-native species are observed more and more frequently.</span></span></span></span></span></span></span></span></span></span></span></p>
FIG. 3 in Intraindividual variation in nuclear DNA content in Durvillaea antarctica (Chamisso) Hariot, Macrocystis pyrifera (Linnaeus) C. Agardh and Lessonia spicata (Suhr) Santelices (Phaeophyceae)
FIG. 3. — Developmental stages of sporangia in Macrocystis pyrifera (Linnaeus) C. Agardh stained with DAPI: A-C, four-nucleate sporangium (4-ns) and sporangial mother cells (smc); D, mature sporangia. Scale bars: A-D, 5 μm.
FIG. 1 in Intraindividual variation in nuclear DNA content in Durvillaea antarctica (Chamisso) Hariot, Macrocystis pyrifera (Linnaeus) C. Agardh and Lessonia spicata (Suhr) Santelices (Phaeophyceae)
FIG. 1. — Cells of Durvillaea antarctica (Chamisso) Hariot stained with DAPI: A, mitotic figure (mf) of dividing cortical cells (cc); B, uninucleate cortical cells; C, D, mature antheridia (ma), antheridia germinative cells (agc), antheridium (a) and four-nucleate antheridium (4-na); E, five-nucleate antheridium (5-na); F, antheridia germinative cells. Scale bars: A-D, 5 μm.
FIG. 3 in The canopy-forming alga Ericaria brachycarpa (J.Agardh) Molinari-Novoa & Guiry (Fucales, Phaeophyceae) shows seasonal and depth adaptation to the incoming light levels
FIG. 3. — Lineal fitting of the photosynthesis/PFD data at the lineal part of the P/PFD curve for the algal specimens collected at different depths.
FIG. 4 in The canopy-forming alga Ericaria brachycarpa (J.Agardh) Molinari-Novoa & Guiry (Fucales, Phaeophyceae) shows seasonal and depth adaptation to the incoming light levels
FIG. 4. — Photosynthesis at saturation (Psat), photosynthesis at low light levels (Pb) and dark respiration (Rd) for specimens thriving at 3 and 20 m (not transplanted: nt3 and nt20) and for those transplanted at the same depth (3to3 and 20to20) and at different depths (3to20 and 20to3) after 11 and 90 days after transplantation.
FIG. 1 in The canopy-forming alga Ericaria brachycarpa (J.Agardh) Molinari-Novoa & Guiry (Fucales, Phaeophyceae) shows seasonal and depth adaptation to the incoming light levels
FIG. 1. — Percentage abundance of Ericaria brachycarpa (J. Agardh) MolinariNovoa & Guiry at the sampling station estimated from 50 reticulated quadrats of 625 cm2 per depth.
FIG. 1 in Sighting of Saccorhiza polyschides (Lightfoot) Batters (Phaeophyceae, Stramenopiles) in Algeria (Mediterranean Sea): an insight into range expansion routes
FIG. 1. — Mediterranean records of Saccorhiza polyschides (Lightfoot) Batters. The date is that of the sighting and, if unknown, that of the publication. TABLE 1. — Mediterranean records of Saccorhiza polyschides (Lightfoot) Batters. Records from the Alboran Sea, close to the Straits of Gibraltar, are not reported.
FIG. 4. — A, B in New data on the morphology, reproduction and distribution of a freshwater brown alga Porterinema fluviatile (Porter) Waern (Phaeophyceae)
FIG. 4. — A, B, Protoplast division into several parts in apical filament cells resulting in the formation of aplanospores; C, nonmotile aplanospores; D, new thalli developing from aplanospores. Scale bars: 10 µm.
FIG. 2. — A in New data on the morphology, reproduction and distribution of a freshwater brown alga Porterinema fluviatile (Porter) Waern (Phaeophyceae)
FIG. 2. — A, Young filaments composed from elongated vegetative cells with an anastomosis (+) between their filaments. Filament with elongated vegetative cells in the transformation process (+); B, young filaments composed from elongated vegetative cells with plastids; C, D, first phase of the transformation of elongated vegetative cells to inflated vegetative cells. Scale bars: 10 µm.
FIG. 1 in New data on the morphology, reproduction and distribution of a freshwater brown alga Porterinema fluviatile (Porter) Waern (Phaeophyceae)
FIG. 1. — Study area map. Location of the karst limnocrene Mlava Spring and cross section through the siphonal channel.
FIG. 3. — A, B in New data on the morphology, reproduction and distribution of a freshwater brown alga Porterinema fluviatile (Porter) Waern (Phaeophyceae)
FIG. 3. — A, B, Newly formed inflated vegetative cells (ic) with thick walls and a large number of lipid droplets (ld), formation of the approximately oval dark cells (dc) with thick walls, elongated axial cells (eac) of filaments, gradually narrowing to the top; C, D, developing intercalary plurilocular sporangia; E, intercalary plurilocular sporangia on the pedicels. Scale bars: 10 µm.
Linked collectors and determiners for: Algas pardas (Ochrophyta: Phaeophyceae) de la colección ficológica "Germán Bula Meyer", de la Universidad del Magdalena.
Natural history specimen data linked to collectors and determiners held within, "Algas pardas (Ochrophyta: Phaeophyceae) de la colección ficológica "Germán Bula Meyer", de la Universidad del Magdalena". Claims or attributions were made on Bionomia by volunteer Scribes, <a href="https://bionomia.net/dataset/c0b4d6ab-21e7-4e07-bb50-d49e899c46dc">https://bionomia.net/dataset/c0b4d6ab-21e7-4e07-bb50-d49e899c46dc</a> using specimen data from the dataset aggregated by the Global Biodiversity Information Facility, <a href="https://gbif.org/dataset/c0b4d6ab-21e7-4e07-bb50-d49e899c46dc">https://gbif.org/dataset/c0b4d6ab-21e7-4e07-bb50-d49e899c46dc</a>. Formatted as a Frictionless Data package.
FIG. 5 in Genetic affinities and biogeography of putative Levantine-endemic seaweed Treptacantha rayssiae (Ramon) M.Mulas, J.Neiva & Á.Israel, comb. nov. (Phaeophyceae)
FIG. 5. — Cross sections of the thallus of Treptacantha rayssiae (Ramon) M.Mulas, J.Neiva & Á.Israel, comb. nov.: A, primary branch; B, detail of the three vegetative tissues at Tel Shikmona; C, primary branch; D, detail of the three vegetative tissues from Achziv. Scale bars: A, 50 µm; B, 200 µm; C, 100 µm; D, 20 µm. Abbreviations: mt, meristoderm; c, cortex; m, medulla.
FIG. 4 in Genetic affinities and biogeography of putative Levantine-endemic seaweed Treptacantha rayssiae (Ramon) M.Mulas, J.Neiva & Á.Israel, comb. nov. (Phaeophyceae)
FIG. 4. — Morphology of Treptacantha rayssiae (Ramon) M.Mulas, J.Neiva & Á.Israel, comb. nov., at Tel Shikmona, Israel (May 2018, voucher IOLR-MM00641): A, habitus of specimen; B, holdfast; C, detail of apical part of branches with receptacles, packed, cylindrical and spiny. Scale bars: A, 4 cm; B, C, 2 cm.
FIG. 3 in Genetic affinities and biogeography of putative Levantine-endemic seaweed Treptacantha rayssiae (Ramon) M.Mulas, J.Neiva & Á.Israel, comb. nov. (Phaeophyceae)
FIG. 3. — Typical morphology of Treptacantha rayssiae (Ramon) M.Mulas, J.Neiva & Á.Israel, comb. nov., at Achziv, Israel (May 2019, voucher IOLR - AmR1652019): A, habitus of specimens; B, apex with smooth tophules; C, detail of apical part of slightly spiny branches with receptacles; D, holdfast. Scale bars: A, C, 2 cm; B, D, 1 cm.
FIG. 2 in Genetic affinities and biogeography of putative Levantine-endemic seaweed Treptacantha rayssiae (Ramon) M.Mulas, J.Neiva & Á.Israel, comb. nov. (Phaeophyceae)
FIG. 2. — Phylogenetic affinities of Treptacantha rayssiae (Ramon) M.Mulas, J.Neiva & Á.Israel, comb. nov. (synonym of C. rayssiae): A, bayesian 50% majority-rule consensus COI tree of selected species of Cystoseira sensu lato (including Cystoseira sensu stricto, Carpodesmia Greville and Treptacantha Kützing) and related genera, showing the phylogenetic position of Treptacantha rayssiae (Ramon) M.Mulas, J.Neiva & Á.Israel, comb. nov. Numbers above the branches are Bayesian posterior probabilities (>0.50) and maximum likelihood bootstrap support values, respectively. The outgroup used was represented by Stephanocystis Trevisan, C. compressa (Esper) Gerloff & Nizamuddin and Sargassum C.Agardh; B, neighbour-joining network of COI sequences of T. rayssiae (Ramon) M.Mulas, J.Neiva & Á.Israel, comb. nov., and related taxa. Terminal black circles correspond to unique sequences/taxa and are sized to their frequency. Small white circles represent internal nodes and perpendicular dashes along branches represent unique base-pair mutations between sequences/taxa. Branch lengths not to scale. Scale bar: A, 0.02 BIPP (Bayesian Inference Posterior Probability).
APPENDIX 1. — Bayesian 50 in Genetic affinities and biogeography of putative Levantine-endemic seaweed Treptacantha rayssiae (Ramon) M.Mulas, J.Neiva & Á.Israel, comb. nov. (Phaeophyceae)
APPENDIX 1. — Bayesian 50% majority-rule consensus COI tree of Treptacantha Kützing (sensu Orellana et al. (2019) synonym of Cystoseira C.Agardh clade VI of Draisma et al. (2010), unique sequences only), showing the phylogenetic position of T. rayssiae (Ramon) M.Mulas, J.Neiva & Á.Israel, comb. nov. Bayesian posterior probabilities (>0.50) and maximum likelihood bootstrap support values, respectively. The outgroup used is T. abies-marina (S.G.Gmelin) C.Agardh, the most divergent of the genus (Bruno de Sousa et al. 2019). Scale bar: 0.006 BIPP (Bayesian Inference Posterior Probability).
FIG. 1 in Genetic affinities and biogeography of putative Levantine-endemic seaweed Treptacantha rayssiae (Ramon) M.Mulas, J.Neiva & Á.Israel, comb. nov. (Phaeophyceae)
FIG. 1. —Reported distribution of Treptacantha rayssiae (Ramon) M.Mulas, J.Neiva & Á.Israel, comb. nov. (synonym of Cystoseira rayssiae): A, occurrence records based on literature records; B, distribution (black dots) in Israeli Mediterranean Sea shores as reported in Ramon (2000) based on herbaria collections. The squares indicate the origin of samples analyzed in this study: Achziv (Gesher Haziv), Tel Shikmona and HaBonim.
FIG. 3 in Molecular-assisted taxonomic study on the Sargassum C.Agardh (Fucales, Phaeophyceae) in northwestern Luzon, Philippines
FIG. 3. — Sargassum aquifolium (Turner) C.Agardh from northwestern Philippines: A, in situ photograph of S. aquifolium growing in the shallow subtidal of Bolinao, Pangasinan; B, habit of S. aquifolium showing holdfast, short main axis, the several compressed secondary axes, and linear-lanceolate to linear-oblanceolate blades with sharply serrate-dentate margins; C, closer view of the basal portion of the thallus showing holdfast (asterisk) and the compressed axes (arrowheads) arising from the short stem; D, portion of an axis showing a ribbed vesicle with foliaceous mucro and compressed stalk (arrowhead) and blades marked with toothed margins. Scale bars: B, 5 cm; C, D, 1 cm.
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Allen Brain Atlas
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OpenNeuro
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