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629 results for “continental shelf”
FIGURE 10. Heterospio guiana n in New species and records of Heterospio (Annelida, Longosomatidae) from continental shelf, slope and abyssal depths of the Atlantic Ocean, Pacific Ocean, Indian Ocean and adjacent seas
FIGURE 10. Heterospio guiana n. sp. A, anterior end (setiger 1–10), dorsal view; B, anterior end (setiger 1–5), dorsal view; C, anterior end, ventral view; D, neuropodial capillary, setiger 4; E–F, neuropodial subuluncini, setiger 12; G, neuropodial capillary setiger 12. A, C, paratype (LACM-AHF Poly 13268); B, D–G, holotype (LACM-AHF Poly 13269).
FIGURE 15. Heterospio alata n in New species and records of Heterospio (Annelida, Longosomatidae) from continental shelf, slope and abyssal depths of the Atlantic Ocean, Pacific Ocean, Indian Ocean and adjacent seas
FIGURE 15. Heterospio alata n. sp. A, anterior and middle segments (setiger 1–11), lateral view; B, anterior end (setiger 1–7), dorsal view; C, anterior end (setiger 1–9), left lateral view; D, neuropodial acicular spines and capillaries, setiger 11, E, neuropodial hook from setiger 1; F, posterior end, left lateral view. A, F, paratype (MCZ 163707); B, holotype (MCZ 163704); C, paratype (MCZ 163710); D–E, paratype (MCZ 163708).
FIGURE 6. Heterospio bathyala n in New species and records of Heterospio (Annelida, Longosomatidae) from continental shelf, slope and abyssal depths of the Atlantic Ocean, Pacific Ocean, Indian Ocean and adjacent seas
FIGURE 6. Heterospio bathyala n. sp. A, 13-setiger anterior fragment with dorsal tentacle attached; B, anterior end, left lateral view; C, anterior end, right lateral view; D, same, middle segments; E, anterior end, left lateral view with dorsal tentacle attached; F, bulbous posterior end, right lateral view. A–B paratype (USNM 1673082); C–D, paratype (USNM 1673080); E, paratype (USNM 1673081); F, (USNM 1673085). A–B, E stained with Shirlastain A; C–D stained with MG. C–D, arrows denote concentrations of MG.
FIGURE 13. Heterospio paulolanai n in New species and records of Heterospio (Annelida, Longosomatidae) from continental shelf, slope and abyssal depths of the Atlantic Ocean, Pacific Ocean, Indian Ocean and adjacent seas
FIGURE 13. Heterospio paulolanai n. sp. Holotype (MZUSP 5588): A, anterior end (setiger 1–10), dorsal view; B, anterior end (setiger 1–5), ventral view; C, neuropodial aristate spines, setiger 11; D, neuropodial capillary seta, setiger 11; E, neuropodial acicular spine, setiger 12; F, neuropodial subuluncinus, setiger 12.
FIGURE 3. Heterospio hartmanae n in New species and records of Heterospio (Annelida, Longosomatidae) from continental shelf, slope and abyssal depths of the Atlantic Ocean, Pacific Ocean, Indian Ocean and adjacent seas
FIGURE 3. Heterospio hartmanae n. sp. A, anterior end, dorsal view; B, anterior end, ventral view; C, anterior end, dorsal view; D, posterior end, left lateral view; E, hook from D; F, acicular spines from setiger 12. A–B, D–F, holotype (LACM-AHF Poly 13270); C, paratype (LACM-AHF Poly 13282).
FIGURE 2. Heterospio hartmanae n in New species and records of Heterospio (Annelida, Longosomatidae) from continental shelf, slope and abyssal depths of the Atlantic Ocean, Pacific Ocean, Indian Ocean and adjacent seas
FIGURE 2. Heterospio hartmanae n. sp. A, complete specimen; B, anterior fourth of A; C, posterior fourth of A with inset of hook (not to scale); D, anterior end, setigers 1–11, dorsal view; E, anterior end, setigers 1–10, dorsal view; F, G, acicular spines and capillaries from middle setigers. A–C, E (USNM 1667391); D, holotype (LACM-AHF Poly 13270); F–G (paratype, LACM-AHF Poly13279). A–E stained with Shirlastain A.
FIGURE 1. Heterospio longissima Ehlers, 1874. A in New species and records of Heterospio (Annelida, Longosomatidae) from continental shelf, slope and abyssal depths of the Atlantic Ocean, Pacific Ocean, Indian Ocean and adjacent seas
FIGURE 1. Heterospio longissima Ehlers, 1874. A, anterior end, right lateral view; B, anterior end, dorsal view. Redrawn from Ehlers (1875).
Fig. 4. Scombrolabrax heterolepis Roule, 1921 in Updated checklist of marine fishes (Chordata: Craniata) from Portugal and the proposed extension of the Portuguese continental shelf
Fig. 4. Scombrolabrax heterolepis Roule, 1921.
Fig. 3 in Updated checklist of marine fishes (Chordata: Craniata) from Portugal and the proposed extension of the Portuguese continental shelf
Fig. 3. Fistularia petimba Lacepède, 1803.
Fig. 2 in Updated checklist of marine fishes (Chordata: Craniata) from Portugal and the proposed extension of the Portuguese continental shelf
Fig. 2. Bajacalifornia megalops (Lütken, 1898).
Data from: Nineteenth-century collapse of a benthic marine ecosystem on the open continental shelf
The soft-sediment seafloor of the open continental shelf is among the least-known biomes on Earth, despite its high diversity and importance to fisheries and biogeochemical cycling. Abundant dead shells of epifaunal suspension-feeding terebratulid brachiopods (Laqueus) and scallops on the now-muddy mainland continental shelf of southern California reveal the recent, previously unsuspected extirpation of an extensive offshore shell-gravel ecosystem, evidently driven by anthropogenic siltation. Living populations of attached epifauna, which formerly existed in a middle- and outer-shelf mosaic with patches of trophically diverse muds, are restricted today to rocky seafloor along the shelf edge and to the sandier shelves of offshore islands. Geological age-dating of 190 dead brachiopod shells shows that (i) no shells have been produced on the mainland shelf within the last 100 years, (ii) their shell production declined steeply during the nineteenth century, and (iii) they had formerly been present continuously for at least 4 kyr. This loss, sufficiently rapid (less than or equal to 100 years) and thorough to represent an ecosystem collapse, coincides with intensification of alluvial-plain land use in the nineteenth century, particularly livestock grazing. Extirpation was complete by the start of twentieth-century urbanization, warming, bottom fishing and scientific surveys. The loss of this filter-feeding fauna and the new spatial homogeneity and dominance of deposit- and detritus-feeders would have altered ecosystem functioning by reducing habitat heterogeneity and seawater filtering. This discovery, attesting to the power of this geological approach to recent ecological transitions, also strongly increases the spatial scope attributable to the negative effects of siltation, and suggests that it has been under-recognized on continental shelves elsewhere as a legacy of coastal land use.
EOOffshore: ERA5 Wind Data for the Irish Continental Shelf Region
<p><a href="https://eooffshore.github.io">EOOffshore</a> is a <a href="https://www.seai.ie/">Sustainable Energy Authority of Ireland (SEAI)</a> funded <a href="https://www.seai.ie/data-and-insights/seai-research/research-projects/details/building-upon-copernicus-earth-observation-services-to-augment-wind-measurement-coverage-of-the-oredp-offshore-renewable-energy-assessment-areas">project</a>, which commenced in June 2020 in the <a href="https://www.ucd.ie/physics/">School of Physics</a> in <a href="https://www.ucd.ie/">University College Dublin (UCD)</a>. It presents a case study that demonstrates the utility of the <a href="https://pangeo.io/">Pangeo</a> software ecosystem in the development of offshore wind speed and power density estimates, increasing wind measurement coverage of offshore renewable energy assessment areas in the <a href="https://www.marine.ie/Home/site-area/irelands-marine-resource/real-map-ireland">Irish Continental Shelf (ICS)</a> region. It has involved the creation of a new <a href="https://eooffshore.github.io/datasets.html">wind data catalog</a> for this region, consisting of a collection of analysis-ready, cloud-optimized (ARCO) datasets featuring up to 21 years of available in situ, reanalysis, and satellite observation wind data products.</p> <p><a href="https://www.ecmwf.int/en/forecasts/datasets/reanalysis-datasets/era5">ERA5</a> is the fifth generation global reanalysis data set produced by the <a href="https://www.ecmwf.int/">European Centre for Medium-Range Weather Forecasts (ECMWF)</a>. It is a component of the <a href="https://climate.copernicus.eu/">Copernicus Climate Change Service (C3S)</a>, where data products are publicly available in the <a href="http://As requested by the ECMWF - Licence to Use Copernicus Products, this Zarr store was: Generated using Copernicus Climate Change Service information [2001 - 2021]">C3S Climate Data Store</a>. This particular catalog data set (<em>eooffshore_ics_era5_single_level_hourly_wind.zarr.tar.gz</em>) contains 2001-2021 products for the ICS region from the <a href="https://cds.climate.copernicus.eu/cdsapp#!/dataset/reanalysis-era5-single-levels?tab=overview"><em>ERA5 hourly data on single levels from 1979 to present</em></a> data set, which provides hourly data from 1979 to the present day, at single levels (atmospheric, ocean-wave and land surface quantities). Wind speed and direction have been calculated from the <em>uX</em> and <em>vX</em> variables, where <em>X = 10 m</em> and <em>100 m</em> above sea level. This ERA5 data set was used in the EOOffshore project outputs presented (<em><a href="https://meetingorganizer.copernicus.org/EGU22/EGU22-2746.html">Scalable Offshore Wind Analysis With Pangeo</a></em>) at the <em><a href="https://meetingorganizer.copernicus.org/EGU22/session/42046">Meeting Exascale Computing Challenges with Compression and Pangeo</a></em> <a href="https://www.egu22.eu/">2022 EGU General Assembly</a> session.</p> <p>Description and example usage of the ERA5 data set in EOOffshore:</p> <ul> <li><a href="https://eooffshore.github.io/ERA5_ICS_Wind_Data.html">ERA5 Wind Data for Irish Continental Shelf region</a></li> <li><a href="https://eooffshore.github.io/Offshore_Wind_AOI.html">Offshore Wind in Irish Areas Of Interest</a></li> <li><a href="https://eooffshore.github.io/Comparison_Wind_Power.html">Comparison of Offshore Wind Speed Extrapolation and Power Density Estimation</a></li> </ul> <p>As requested by the <a href="https://apps.ecmwf.int/datasets/licences/copernicus/">ECMWF - Licence to Use Copernicus Products</a>, this Zarr store was:</p> <ul> <li> <p>Generated using Copernicus Climate Change Service information [2001 - 2021]</p> </li> </ul>
Fig. 15 in Amphipod (Crustacea: Malacostraca) fauna of the continental shelf region in the Southern Sea of Korea
Fig. 15. The proportion of species in each family to the total number of species.
Fig. 2. Collecting methods. A in Amphipod (Crustacea: Malacostraca) fauna of the continental shelf region in the Southern Sea of Korea
Fig. 2. Collecting methods. A, SM grab; B, Conical net; C, MOCNESS net; D, trawl net.
Fig. 14. A in Amphipod (Crustacea: Malacostraca) fauna of the continental shelf region in the Southern Sea of Korea
Fig. 14. A, Primno sp.; B, Podocerus hoonsooi; C, Cranocephalus sp.
The Seasonality of the Heat Budget on the Ross Sea Continental Shelf in a Coupled Regional Ocean-Sea Ice-Ice Shelf Model
<p>This dataset includes the model data used in our paper entitled 'The Seasonality of the Heat Budget on the Ross Sea Continental Shelf in a Coupled Regional Ocean-Sea Ice-Ice Shelf Model'</p>
Data for The influence of bathymetry over heat transport onto the Amundsen Sea continental shelf
<p>Data and code for producing figures for the paper 'The influence of bathymetry over heat transport onto the Amundsen Sea continental shelf'</p>
Replication data for: Future response of Antarctic continental shelf temperatures to ice shelf basal melting and calving
<p>Replication data for: Future response of Antarctic continental shelf temperatures to ice shelf basal melting and calving</p> <p>This manuscript is in press at Geophysical Research Letters.</p> <p><a href="https://zenodo.org/api/files/e04b47c6-d136-4833-b8c6-a79f5b05eb65/SSP585FW_ensemble.tar.gz?versionId=6f33274b-a436-4850-99a8-9dac047b812b">SSP585FW_ensemble.tar.gz</a> contains data needed to replicate the figures and analysis in the manuscript.</p>
Ontogeny of movement patterns in naïve grey seal pups inhabiting a complex continental shelf ecosystem
<p>Most vertebrate offspring must transition from the relative security of parental care (nutrition and protection) to independent foraging. Offspring face many challenges during this critical period, particularly in species where parental care ends at weaning, such as the grey seal (<em>Halichoerus</em> <em>grypus</em>). We studied the development of movement behaviour in naïve grey seal pups from their first trips to sea to about five months of age. Twenty-five (12 males and 13 females) newly-weaned pups were fitted with satellite-linked GPS tags on Sable Island, Nova Scotia, Canada in January 2016. The influence of fixed effects (pup size, sex, week) and the random effect of pup identity on trip characteristics were examined. Movement behaviour was analyzed using a move persistence mixed-effects model. Habitat use was highly variable among individuals and covered much of the geographic distribution of the population. Unlike older juveniles, subadults, and adults in this population, most naïve pups used multiple haulout sites to begin and end trips. There was little evidence of area-restricted search behaviour during trips, suggesting that naïve pups were using an opportunistic foraging tactic that may result in more variable foraging success than that of older, experienced animals. Naïve pups made longer trips with longer haulout durations between them than observed for older greys seals. Males and females differed in some trip characteristics, but sex effects were small over the first few months of life. Offspring size at weaning was not a useful predictor of trip characteristics. Move persistence of grey seal pups was initially high and then decreased over time as individuals gained experience. Both intrinsic and extrinsic factors were influential on the movements of grey seal pups. Greater body length at weaning, longer duration spent on shore after weaning, shallower water column depth, and farther distance from shore were all associated with lower move persistence. Female grey seal pups had lower move persistence than males. Overall, the movements of naïve grey seal pups during the first few months of life were characterized by extensive exploration, but move persistence decreased over time suggesting they may be using an exploration-refinement foraging tactic.</p>
Data from: Nineteenth-century collapse of a benthic marine ecosystem on the open continental shelf
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