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78 results for “tidal flats”
Topobathymetric DEMs of Short Prong marsh and tidal flat in Hog Island Bay, VA 2022-2023
Seamless DEMs of the marsh edge and tidal flat at Short Prong in 2022 and 2023 were created using a combination of aerial photogrammetry and boat-mounted single-beam echosounding. Aerial photogrammetry surveys of the subaerial intertidal flat and marsh edge were completed during low tide using a DJI Phantom 4 RTK drone. Positioning was determined using six surveyed ground control points and drone on-board RTK. During high tide, a single beam echosounder was used to survey six cross-shore transects of the subtidal and one alongshore transect near the marsh edge. The same flight plan and echosounding survey path was used both years, with surveys taking place on 7/19/22 and 7/11/23. Photogrammetric data was processed in Agisoft Metashape to produce a DEM and a photomosaic. Echosounding data was processed in Hydromagic and interpolated using the natural neighbor method in GIS. Overlap of survey extent between photogrammetric and echosounding DEMs were stitched together in GIS to create seamless DEMs with a cellsize of 3 cm from the lower elevations of the marsh platform into the subtidal flat for 2022 and 2023.
Moita-Montijo Bay saltmarsh and tidal flat change rates (1958-2018)
<p>Saltmarsh and tidal flat change rates were determined for the period of 1958 to 2018, for the Moita-Montijo Bay (Tagus Estuary, Portugal). Rates were determined only for the exposed saltmarsh. No rates were calculated for sheltered saltmarsh (saltmarsh inside abandoned saltpans and similar structures). Saltmarsh margins were delineated in ArcMap, using, as the carthographic basis, orthorectified aerial photgraphs from 1958 and orthophotomaps from 1995 and 2018 (from Direção Geral do Território (DGT)).</p> <p>Tidal flat change rates were determined for the period of 1977 to 2018, in the north and south banks of the Montijo Channel (Moita-Montijo Bay, Tagus Estuary, Portugal). Rates were determined only for the Montijo Channel margins. The tidal flat margins were delineated in ArcMap, using, as the carthographic basis, orthorectified aerial photgraphs from 1977 and orthophotomaps from 1995 and 2018 (from DGT).</p> <p>The Digital Shoreline Analysis System (DSAS) in ArcMap was used to calculate the End Point Rates (EPR) between the margins (See Himmelstoss et al. (2018) for details on how to the EPR is calculated using DSAS).</p> <p>This dataset was produced in the scope of the Project Planta II*. Further details can be consulted in Martins et al. (2023).</p> <p> </p> <p>Dataset:</p> <ul> <li>Saltmarsh change rates in the Moita-Montijo Bay (1958 to 1995) (Tagus Estuary, Portugal) = rates_smarsh_moitamontijobay_1958_1995.shp</li> <li>Saltmarsh change rates in the Moita-Montijo Bay (1995 to 2018) (Tagus Estuary, Portugal) = rates_smarsh_moitamontijobay_1995_2018.shp</li> <li>Tidal flat change rates in the north bank of the Montijo Channel (1977 to 1995) (Moita-Montijo Bay, Tagus Estuary, Portugal) = rates_tf_nb_moitamontijobay_1977_1995.shp</li> <li>Tidal flat change rates in the north bank of the Montijo Channel (1995 to 2018) (Moita-Montijo Bay, Tagus Estuary, Portugal) = rates_tf_nb_moitamontijobay_1995_2018.shp</li> <li>Tidal flat change rates in the south bank of the Montijo Channel (1977 to 1995) (Moita-Montijo Bay, Tagus Estuary, Portugal) = rates_tf_sb_moitamontijobay_1977_1995.shp</li> <li>Tidal flat change rates in the south bank of the Montijo Channel (1995 to 2018) (Moita-Montijo Bay, Tagus Estuary, Portugal) = rates_tf_sb_moitamontijobay_1995_2018.shp</li> </ul> <p>Please cite the paper where this dataset is discussed as Martins, D., Alves da Silva, A., Duarte, J., Canário, J., & Vieira, G. (2023). Changes in vessel traffic disrupt tidal flats and saltmarshes in the Tagus Estuary, Portugal. <em>Estuaries and Coasts</em>. DOI: <a href="https://doi.org/10.1007/s12237-023-01198-7">https://doi.org/10.1007/s12237-023-01198-7</a></p> <p>*Project Planta II - PTDC/CTA-GQU/31208/2017, co-funded by the European Regional Development Fund (ERDF), through the financing Regional Operational Program of Lisbon, and by the Portuguese Science and Technology Foundation (FCT), through the national funds (PIDDAC).</p>
Oxygen Fluxes on Virginia Tidal Flats, 2015-2018
Bare tidal flats along the eastern USA coast are increasingly undergoing state changes to one of two systems: human-restored Crassostrea virginica oyster reefs or invasive Agarophyton (Gracilaria) macroalgal mats, with little known about how these changes impact ecosystem metabolism. This dataset details aquatic eddy covariance (AEC) benthic oxygen fluxes, along with physical drivers such as flow speed and light, of 3 oyster reefs, 2 macroalgal beds, and 1 bare mudflat located at the Virginia Coast Reserve (VCR). The oyster reef data spans 4 years (2015 - 2018) and all seasons, while the mudflat and Agaraphyton data are from summers 2015 and 2017, respectively. These flux data are used to calculate the metabolism (R, GPP, NEM) of these systems, in order to better understand how state changes have impacted carbon cycling on the Virginia coast.
Data set for the article "Tides, topography, and seagrass cover controls on the spatial distribution of Pinna nobilis on a coastal lagoon tidal flat"
<p>Data set includes: coordinates of the GNSS points (reference system WGS84 UTM33N); density of P. nobilis and cover of C.nodosa detected in the orthophoto in the 25m<sup>2</sup> cells; tidal levels measured (and, for comparison, simulated with the hydrodynamic model) corrected with respect to the IGM datum; number of emersions and flood duration for different levels of the tidal flat; statistics. The first Excel sheet includes a detailed description of the data.</p>
Fig. 8 in Optimal fishing samplers to reveal the morphological structure of a fish assemblage in a subtropical tidal flat
Fig. 8. Redundancy analysis (RDA): individual species-gear relationships explained by morphological shape variability, using incidence data. In blue, fishing gear acronyms: beach seine (BS), cast net (CN), fish trap (FT), hook and line (HL), inner encircling gillnet (EG1), large gillnet (LG), marginal encircling gillnet (EG2), otter trawl (OT), small gillnet (SG).
Fig. 4 in Optimal fishing samplers to reveal the morphological structure of a fish assemblage in a subtropical tidal flat
Fig. 4. Morphospace represented by shape variation of all species in the nine fishing gears grouped, using the relative warps: a. 1 and 2; b. 1 and 3. Acronyms: Anc tri, Anchoa tricolor; Bat sop, Bathygobius soporator; Bot oce, Bothus ocellatus; Cen par, Centropomus parallelus; Chi spi, Chilomycterus spinosus; Dia rho, Diapterus rhombeus; Elo sau, Elops saurus; Epi mar, Epinephelus marginatus; Hip rei, Hippocampus reidi; Lut ana, Lutjanus analis; Lut cya, Lutjanus cyanopterus; Mal del, Malacoctenus delalandii; Myr pun, Myrophis punctatus; Oph gom, Ophichthus gomesii; Pol vir, Polydactylus virginicus; Sca cri, Scartella cristata; Sco bra, Scomberomorus brasiliensis; Sel set, Selene setapinnis; Sel vom, Selene vomer; Sph tes, Sphoeroides testudineus; Str mar, Strongylura marina; Sym tes, Symphurus tesselatus; Tra myo, Trachinocephalus myops. Threatened species (Hip rei, Lut ana, Lut cya, Epi mar) are highlighted in red.
Fig. 4 in Taxonomy and distribution of two small Tryblionella (Bacillariophyceae) species from the Northeast Asian tidal flats
Fig. 4. Scanning electron microscope photographs of two newly recorded species. (a-d) Tryblionella adducta (a: external view of the whole valve, b: external view of the valve apex with slightly radiating striae, c: internal view of the whole valve, d: internal valve of valve apex with conspicuous fibulae); (e, f) Tryblionella hyalina (e: internal view of the whole valve, f: internal view of valve apex).
Fig. 2 in Taxonomy and distribution of two small Tryblionella (Bacillariophyceae) species from the Northeast Asian tidal flats
Fig. 2. Light microscope photographs of Tryblionella adducta from Korea (a-d) and China (e-u). Scale bar = 10 μm.
Fig. 1 in Taxonomy and distribution of two small Tryblionella (Bacillariophyceae) species from the Northeast Asian tidal flats
Fig. 1. Map showing the sampling locations along the coasts of the Yellow Sea where Tryblionella adducta and T. hyalina were observed.
Fig. 8. Myzomolgus cucullatus n in Three new species of Myzomolgus (Copepoda, Cyclopoida, Catiniidae) associated with sipunculan worms from a tidal flat in Phuket, Thailand
Fig. 8. Myzomolgus cucullatus n. sp., female. A, anal somite and caudal rami, dorsal; B, paragnath; C, maxillule; D, maxilla; E, distal segment of maxilla; F, leg 1; G, leg 2; H, leg 4; I, leg 5. Scale bars: A, D, E, 0.02 mm; B, C, 0.01 mm; F-I, 0.05 mm.
Fig. 7. Myzomolgus cucullatus n in Three new species of Myzomolgus (Copepoda, Cyclopoida, Catiniidae) associated with sipunculan worms from a tidal flat in Phuket, Thailand
Fig. 7. Myzomolgus cucullatus n. sp., female. A, habitus, dorsal; B, urosome, dorsal; C, urosome, ventral; D, rostral area, ventral; E, antennule; F, antenna; G, mandible; H, right genital area, ventral. Scale bars: A, 0.1 mm; B-E, 0.05 mm; F-H, 0.02 mm.
Fig. 6. Myzomolgus spatulatus n in Three new species of Myzomolgus (Copepoda, Cyclopoida, Catiniidae) associated with sipunculan worms from a tidal flat in Phuket, Thailand
Fig. 6. Myzomolgus spatulatus n. sp., male. A, habitus, dorsal; B, urosome, ventral; C, antennule; D, labrum; E, maxilla; F, maxilliped. Scale bars: A, 0.1 mm; B, 0.02 mm; C-F, 0.01 mm.
Fig. 4. Myzomolgus spatulatus n in Three new species of Myzomolgus (Copepoda, Cyclopoida, Catiniidae) associated with sipunculan worms from a tidal flat in Phuket, Thailand
Fig. 4. Myzomolgus spatulatus n. sp., female. A, habitus, dorsal; B, urosome, dorsal; C, urosome, ventral; D, cephalic region, ventral; E, antennule; F, mandible; G, maxillule. Scale bars: A, 0.1 mm; B, C, 0.05 mm; D, E, 0.02 mm; F, G, 0.01 mm.
Fig. 3. Myzomolgus leptocercosus n in Three new species of Myzomolgus (Copepoda, Cyclopoida, Catiniidae) associated with sipunculan worms from a tidal flat in Phuket, Thailand
Fig. 3. Myzomolgus leptocercosus n. sp., male. A, habitus, dorsal; B, urosome, ventral; C, distal part of urosome, dorsal; D, antenna; E, labrum; F, maxilliped. Scale bars: A, 0.1 mm; B, C, 0.05 mm; D-F, 0.02 mm.
Fig. 5. Myzomolgus spatulatus n in Three new species of Myzomolgus (Copepoda, Cyclopoida, Catiniidae) associated with sipunculan worms from a tidal flat in Phuket, Thailand
Fig. 5. Myzomolgus spatulatus n. sp., female. A, antenna; B, maxilla; C, leg 1; D, leg 2; E, leg 4. Scale bars: A, C-E, 0.02 mm; B, 0.01 mm.
Fig. 2. Myzomolgus leptocercosus n in Three new species of Myzomolgus (Copepoda, Cyclopoida, Catiniidae) associated with sipunculan worms from a tidal flat in Phuket, Thailand
Fig. 2. Myzomolgus leptocercosus n. sp., female. A, maxillule; B, maxilla; C, leg 1; D, leg 2; E, leg 4; F, leg 5; G, left genital area, dorsal. Scale bars: A, 0.01 mm; B-G, 0.02 mm.
Fig. 1. Myzomolgus leptocercosus n in Three new species of Myzomolgus (Copepoda, Cyclopoida, Catiniidae) associated with sipunculan worms from a tidal flat in Phuket, Thailand
Fig. 1. Myzomolgus leptocercosus n. sp., female. A, habitus, dorsal; B, urosome, dorsal; C, urosome, ventral; D, egg sac; E, rostral area, ventral; F, antennule; G, antenna; H, labrum; I, mandible. Scale bars: A, D, 0.1 mm; B, C, E, 0.05 mm; F-H, 0.02 mm; I, 0.01 mm.
Fig. 4 in Taxonomy and distribution of two small negligible diatoms of Plagiogrammopsis minima and Diploneis aestuarii from Northeast Asian tidal flats
Fig. 4. Light microscope (LM) photographs of Diploneis aestuarii: A-N. Size range in valve view. Scale bar = 10 μm.
Fig. 3 in Taxonomy and distribution of two small negligible diatoms of Plagiogrammopsis minima and Diploneis aestuarii from Northeast Asian tidal flats
Fig. 3. Scanning electron microscope (SEM) photographs of Plagiogrammopsis minima from A-D (Minami-arao, Japan), E, F (Nakdong, Busan, Korea): A. Entire view of the girdle. Arrow indicates row of the short spines on the valve face. Large arrowhead indicates girdle bands ornamented by a row of poroids; B. External view of the valve face with girdle bands. Right arrow indicates pseudoseptum extends from margin to margin in the central fascia. Left arrow indicates the cribrum occlusion; C. External view of the whole valve. Large arrowheads indicate the two ocelluli which are twisted to opposite directions along the valve axis. Arrow indicates the cribrum occlusion; D. Internal view of the whole valve. Large arrowheads indicate the two ocelluli which are twisted to opposite directions at valve apex. Arrow indicates internal view of the cribrum occlusion located outside of the areolae; E. Right arrow indicates the pseudosptum while left arrow indicates external aperture of the rimoportula; F. Right arrow indicates the pseudosptum while left arrow indicates a rimoportula.
Data, Scripts underlying the publication: Identifying the critical turbidity threshold to maintain estuarine tidal flats worldwide
<p>Data & Scripts featured in the currently unpublished manuscript (as of 21-07-2023) Grandjean et al.: 'Identifying the critical turbidity threshold to maintain estuarine tidal flats worldwide'. This study explores the relationship between tidal range and turbidity concentrations on the morphological trajectory of unvegetated tidal flats at a global scale. These files include the scripts used to produce digital elevation models per estuary.</p> <p> </p>
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Allen Brain Atlas
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International Brain Laboratory public data
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OpenNeuro
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