Data · collection
Study of benthic fauna asociated to volcanic structures of Bransfield Strait central basin
Listed in NASA Earthdata CMR
In English: During GEBRAP 96 Survey, 9 trawls from 647 to 1592 meters in depth were carried out on underwater volcanic structures located at the central basin of Bransfield Strait.
Description
Its objective was to collect lithological samples and associated benthic fauna, supposedly exposed to hydrotermalism. A rocky dredge of 0.80 x 0.30 (hotizontal and vertical opening), with 10 mm of mesh size and leather protection, was basically used.
Samples were sieved and separated into 35 faunistic groups whose numerical abundance and biomass were quantificated on board. At neither of four sampled volcanic structures, invertebrates with hydrothermal characteristics were found, being Hexactinellida, Polychaeta (Errantia y Sedentaria), Ophiuroidea y Ascidiacea more frequent taxa. Mainly numerical abundance corresponded to Polychaeta Sedentaria (56%) and Ophiuroidea (14%), and highest biomass (we weight) to Porifera (38%), Ophiuroidea (16.5%) and Polychaeta Sedentaria (10%).
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Benthic communities were basically constituted by deposit-feeding fauna, Polychaeta Sedentaria (Maldanidae) and Ophiuroidea as correspond to deep areas related to mud or mixed sediments, subjects to high sedimentation rate. The presence of suspension-feeders, Porifera, Bryozoa, Polychaeta Sedentaria (Serpulidae), Brachiopoda, and Crinoidea, was in relation to coarse sedimentary deposits (gravels to blocks), at more slope zones, exposed to current, mainly in volcanic structure.
En Espanol: Durante la campana GEBRAP 96 se realizan 9 arrastres entre 647 m y 1592 m de profundidad sobre los edificios volcanicos submarinos existentes en la cuenca central del estrecho de Bransfield, con el objetivo de obtener muestras litologicas y de la fauna bentonica asociada, presumiblemente sometida a hidrotermalismo. Se utilizo basicamente una draga de roca de 0.80 x 0.30 m (abertura horizontal y vertical) con red de 10 mm de malla y proteccion de cuero.
Las muestras se tamizaron y separaron en 35 grupos faunisticos, cuyas abundancias numericas y ponderales fueron cuantificadas a bordo. En ninguna de las cuatro estructuras volcanicas muestreadas se han encontrado invertebrados de caracteristicas hidrotermales, siendo Hexactinellida, Polychaeta (Errantia y Sedentaria), Ophiuroidea y Ascidiacea los taxones mas frecuentes. La mayor abundancia en numero correspondio a Polychaeta Sedentaria (56%) y Ophiuroidea (14%) y en biomasa (peso fresco) a Porifera (38%), Ophiuroidea (16.5%) y Polychaeta Sedentaria (10%).
Las comunidades bentonicas estuvieron constituidas basýcamente por fauna detritivora, Polychaeta Sedentaria (Maldanidae) y Ophiuroidea, como corresponde a ýreas profundas asociadas a depositos fangosos y mixtos, sujetos a elevadas tasas de sedimentacion. La presencia de suspensivoros, Porifera, ryozoa, Polychaeta Sedentaria (Serpulidae), Brachiopoda, y Crinoidea, estuvo relacionado con la presencia de depositos sedimentarios groseros (graves a bloques), en zonas de mayor pendiente, sometidas a corrientes.
Links
Catalogue records · 2
- CMR record cmr.earthdata.nasa.gov/search/concepts/C1214621663-SCIOPS.html ↗
catalogue entry · from NASA CMR
- CMR UMM-JSON cmr.earthdata.nasa.gov/search/concepts/C1214621663-SCIOPS.umm_json ↗
metadata API · from NASA CMR
Topics
- Stated by source
- Animals Invertebrates · Benthic · BENTHOPELAGIC NET · Community Structure · GRAB SAMPLERS · Marine Geophysics · Ocean Currents · PLANKTON NETS · Sedimentation · SHIPS
Provenance · 1 source records, 16 field assertions
| Source | Key | Last seen | Raw |
|---|---|---|---|
| NASA Earthdata CMR | C1214621663-SCIOPS | 14 d ago | JSON v1 |
| Field | Assertion | Extractor | Evidence |
|---|---|---|---|
| access_level | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[instrument].gcmd_instrument:benthopelagic-net | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[instrument].gcmd_instrument:grab-samplers | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[instrument].gcmd_instrument:plankton-nets | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[measured_variable].gcmd:earth-science/biological-classification/animals-invertebrates | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[measured_variable].gcmd:earth-science/biosphere/ecological-dynamics/community-dynamics/community-structure | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[measured_variable].gcmd:earth-science/biosphere/ecosystems/marine-ecosystems/benthic | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[measured_variable].gcmd:earth-science/oceans/marine-geophysics | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[measured_variable].gcmd:earth-science/oceans/marine-sediments/sedimentation | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[measured_variable].gcmd:earth-science/oceans/ocean-circulation/ocean-currents | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[platform].gcmd_platform:ships | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| description | source · NASA CMR | connector:nasa_cmr@1.0.0 | /umm/Abstract |
| spatial | source · NASA CMR | connector:nasa_cmr@1.0.0 | /umm/SpatialExtent |
| temporal | source · NASA CMR | connector:nasa_cmr@1.0.0 | /umm/TemporalExtents |
| title | source · NASA CMR | connector:nasa_cmr@1.0.0 | /umm/EntryTitle |
| version_label | source · NASA CMR | connector:nasa_cmr@1.0.0 |