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85 results for “Sargassum”
Algae, and Seagrass Coverage Relative to Presence of Sargassum in a Seagrass Meadow within Crandon Park, Florida, USA, March 2024 – March 2025
This package contains data on percent coverage of sargassum, seagrass, and algae recorded along 3 transects extending from the shoreline of Crandon Park, Florida from 2024-03-07 to 2025-03-26 as part of the Coastal Ecosystem-Research Experience for Teachers (CE-BIORETS) program. The data also include epiphyte-cover scores and water visibility, temperature, and salinity values. We placed a m^2 quadrat on the seafloor at 5-meter intervals along three 50-meter transects extending from the shoreline. We then recorded percent coverage of seagrass, algae, and sargassum taxa (to genus or species) and the epiphyte load within the quadrat. We also recorded water visibility, temperature, and salinity at the water surface along the transect. We collected these data to investigate the impact sargassum has on native seagrass meadows. Data collection for this project is complete
Data to support "Marks et al 2016. Assessment of control methods for the invasive seaweed Sargassum horneri in California, USA"
Determining the feasibility of controlling marine invasive algae through removal is critical to developing a strategy to manage their spread and impact. To inform control strategies, we investigated the efficacy and efficiency of removing an invasive seaweed, Sargassum horneri, from rocky reefs on Santa Catalina Island, southern California, USA. We tested the efficacy of removal as a means of reducing colonization and survivorship by clearing S. horneri from 60 m2 circular plots. We also examined whether S. horneri is able to regenerate from remnant holdfasts with severed stipes to determine whether efforts to control S. horneri require the complete removal of entire individuals. In addition, we developed efficiency metrics for manual removal with and without the aid of an underwater suction device. These data have been presented in: Marks, L.M., D.C. Reed and A.K. Obaza. 2016. Assessment of control methods for the invasive seaweed Sargassum horneri in California, USA. Management of Biological Invasions, DOI: 10.3391/mbi.2017.8.2.08, <ulink url="https://doi.org/10.3391/mbi.2017.8.2.08">https://doi.org/10.3391/mbi.2017.8.2.08</ulink>
Records of Sargassum horneri occurrence in the eastern Pacific
Presented here are records of the occurrence of Sargassum horneri in California, USA, and Baja California, Mexico, since 2003, the year it was first discovered in the eastern Pacific. These data and their sources were published as supplementary tables in: Marks LM, Salinas-Ruiz P, Reed DC, Holbrook SJ, Culver CS, Engle JM, Kushner DJ, Caselle JE, Freiwald J, Williams JP, Smith JR, Aguilar-Rosas LE, Kaplanis NJ (2015) Range expansion of a non-native, invasive, macroalga Sargassum horneri (Turner) C. Agardh, 1820 in the eastern Pacific. BioInvasions Records 4, DOI: 10.3391/bir.2015.4.4.02
Trajectories of Stokes drifter deployed during the RV Pelagia Sargassum Cruise PE-455
<p>Trajectories of the 20 Stokes drifters deployed in the Tropical Atlantic Ocean during the RV Pelagia Sargassum Cruise PE-455. The code to analyse these drifters is available at https://github.com/OceanParcels/Sargassum_Drifters</p>
Tracking sargassum pathways across the Tropical Atlantic
<p>This dataset includes the date, time, address, latitude, longitude, speed, and altitude data collected by GPS trackers deployed in sargassum mats. For more information on the methods and data see Fidai et al. (2023) 'Tracking and detecting sargassum pathways across the Tropical Atlantic'. </p>
Figure 8 in Population and reproductive biology of two caprellid species (Crustacea: Amphipoda) associated to Sargassum cymosum (Phaeophyta: Fucales) on the southeast coast of Brazil
Figure 8. Frequency of females (F), males (M), ovigerous females (OF), mature females (MF) and juveniles (J) in size classes (total length in mm) of Pseudaeginella montoucheti over the studied period.
Figure 6 in Population and reproductive biology of two caprellid species (Crustacea: Amphipoda) associated to Sargassum cymosum (Phaeophyta: Fucales) on the southeast coast of Brazil
Figure 6. Monthly values of ovigerous female density (ind./g of algae) (mean ± standard error) of Paracaprella tenuis and Pseudaeginella montoucheti from October 2010 to September 2011.
Figure 7 in Population and reproductive biology of two caprellid species (Crustacea: Amphipoda) associated to Sargassum cymosum (Phaeophyta: Fucales) on the southeast coast of Brazil
Figure 7. Frequency of females (F), males (M), ovigerous females (OF), mature females (MF) and juveniles (J) in size classes (total length in mm) of Paracaprella tenuis over the studied period.
Fig. 2 in Invertebrate Fauna Associated with Floating Sargassum horneri (Fucales: Sargassaceae) in the East China Sea
Fig. 2. Density of total taxa of epibionts on floating algae (A), abundance of total taxa (B), and Simpson's diversity index (C) presented as box plots. The number above each box indicates the number of examined algal rafts per station. The black line in each box shows the median and the whiskers show the range except for the outlier (black dot).
Fig. 3 in Invertebrate Fauna Associated with Floating Sargassum horneri (Fucales: Sargassaceae) in the East China Sea
Fig. 3. Correlations between number of total taxa and examined algal wet weight (A) (n=53, R2=0.21); abundance of total taxa and examined algal wet weight (B) (n=53, R2=0.41); and Simpson's diversity index and examined algal wet weight (C) (n=53, R2 = 0.10).
Fig. 2. Selected photographs showing the sargassum habitat and Scyllaea fulva. A in Positive association between PTN polymorphisms and schizophrenia in Northeast Chinese Han population.
Fig. 2. Selected photographs showing the sargassum habitat and Scyllaea fulva. A, Sargassum bed at Tai She Wan; B, In situ swimming Scyllaea fulva; C, Dorsal view of Scyllaea fulva in a beaker; D, Lateral view of Scyllaea fulva in a beaker. Scale bar = 0.5 cm.
A review of epibiont hydrozoans on Sargassum
<p>The database collects information on hydroid epibionts of Sargassum records worldwide from 1802 to 2020.</p>
Holopelagic Sargassum aggregations provide warmer microhabitats for associated fauna
<p><span>Drifting aggregations of <em>Sargassum</em> algae provide critical habitat for endemic, endangered, and commercially important species. They may also provide favorable microclimates for associated fauna. To quantify thermal characteristics of holopelagic <em>Sargassum</em> aggregations, we evaluated thermal profiles of 50 aggregations in situ in the Sargasso Sea. </span><span>Sea surface temperature (SST) in the center of </span><span>aggregations</span><span> was significantly higher than in nearby open water, and SST differential was independent of </span><span>aggregation</span><span> volume, area, and thickness. SST differential between </span><span>aggregation</span><span> edge and open water was smaller than those between </span><span>aggregation</span><span> center and </span><span>aggregation</span><span> edge and between </span><span>aggregation</span><span> center and open water. Water temperature was significantly higher inside and below </span><span>aggregations</span><span> compared to open water but did not vary inside </span><span>aggregations</span><span> with depth. </span><span>Holopelagic </span><em><span>Sargassum</span></em><span> aggregations provide warmer microhabitats for associated fauna, which may benefit marine ectotherms, though temperature differentials were narrow (up to 0.7 °C) over the range of </span><span>aggregation</span><span> sizes we encountered (area 0.01–15 m<sup>2</sup>). </span><span>We propose a hypothetical curve describing variation in SST differential with <em>Sargassum</em> aggregation size as a prediction for future studies to evaluate across temporal and geographic ranges. Our study provides a foundation for investigating the importance of thermal microhabitats in holopelagic <em>Sargassum</em> ecosystems</span><span>.</span></p>
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.
FIG. 1 in Molecular-assisted taxonomic study on the Sargassum C.Agardh (Fucales, Phaeophyceae) in northwestern Luzon, Philippines
FIG. 1. — Map of the Philippines showing collection localities and distribution of specimens of Sargassum C.Agardh used in this study.
FIG. 2 in Molecular-assisted taxonomic study on the Sargassum C.Agardh (Fucales, Phaeophyceae) in northwestern Luzon, Philippines
FIG. 2. — Maximum likelihood tree of Sargassum C.Agardh from northwestern Philippines based on cox3 sequence data. Support values in the form of nonparametric bootstrap (NPBS), approximate likelihood ratio test percentages (aLRT), ultrafast bootstrap (UFBS) and Bayesian posterior probabilities (BPP) are shown at each branch. Thickened lines indicate highly supported nodes (NPBS: ≥ 90%; aLRT: ≥ 90%; UFBS: ≥ 95%; and BPP: ≥ 0.90). Values <80% (NPBS), <80% (aLRT), <80% (UFBS), and <0.80 (BPP) are removed. Specimen codes correspond to those listed in Appendix 1. Abbreviations: AU, Australia; FP, French Polynesia; KR, Korea; NC, New Caledonia; PH, Philippines; SG, Singapore; VU, Vanuatu.
FIG. 5. — Sargassum polycystum C in Molecular-assisted taxonomic study on the Sargassum C.Agardh (Fucales, Phaeophyceae) in northwestern Luzon, Philippines
FIG. 5. — Sargassum polycystum C.Agardh from northwestern Philippines: A, habit of a typical muricate S. polycystum showing stoloniferous holdfast (s) arising from the main axes, these having several cauline blades (ca); B, habit of a female specimen of S. polycystum; C, habit of a male S. polycystum with few secondary axes, some areas showing filiform receptacles; D, portion of an axis showing short protuberances typical to S. polycystum; E, portion of a female S. polycystum specimen showing a smooth surface and numerous, often densely aggregated mucronate vesicles; F, terminal portion of an axis showing young, flattened receptacles (arrowheads) closely associated with ovoid vesicles with short mucro, each vesicle also having long stalks; G, terminal portion of an axis of a male specimen showing branching filiform receptacles (arrowhead) that are closely associated with spherical vesicles with short stalks. Scale bars: A-C, 5 cm; D, E, 1 cm; F, G, 0.25 cm.
FIG. 4 in Molecular-assisted taxonomic study on the Sargassum C.Agardh (Fucales, Phaeophyceae) in northwestern Luzon, Philippines
FIG. 4. — Sargassum ilicifolium (Turner) C.Agardh from northwestern Philippines: A, top view of some S. ilicifolium thalli growing in the shallow subtidal of Arosan, Bolinao, Pangasinan; B, in situ photograph of a young S. ilicifolium thalli showing the wavy and toothed and occasionally "duplicated" blades (arrowhead); C, pressed herbarium specimen of S. ilicifolium from Ilocos Sur, Philippines. Portion of an axis showing several turbinariod blades (C': arrowheads); D, portion of an axis showing small, ribbed vesicles (arrowheads) growing together with blades of various shapes; E, fertile portion of a female plant showing the compressed to flattened and toothed female receptacles (arrowheads) that are closely associated with blades; F, portion of a male plant showing terete receptacles (arrowheads) that are closely associated with vesicles (arrows) and blades; G, variability of shape and form of S. ilicifolium blades, those with double rows of teeth, duplicated apical margins, and with cup-shaped/turbinarioid apices are indicated with double arrowheads, arrow, and arrowhead, respectively. Scale bars: C, 5 cm; C', E-G, 1 cm; D, 2 cm.
Holopelagic Sargassum aggregations provide warmer microhabitats for associated fauna
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SBC LTER: Sargassum horneri life history in southern California
These data describe the results of surveys and experiments performed to characterize the life history of the invasive seaweed Sargassum horneri and quantify traits that promote its spread and persistence, including seasonality in abundance and reproduction, habitat affinity, and capacity for local dispersal. This data package includes five data tables and they are used to support a manuscript: Marks LM, Reed DC, Holbrook SJ (2018) Life history traits of the invasive seaweed Sargassum horneri at Santa Catalina Island, California. Aquatic Invasions 13 (3): 339–350. doi: https://doi.org/10.3391/ai.2018.13.3.03
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