Epimegabenthos based on seafloor georeferenced mosaics of the Hornsundbanken methane seep area

Occurrence
Dernière version Publié par The University Centre in Svalbard le mai 12, 2026 The University Centre in Svalbard
Date de publication:
12 mai 2026
Licence:
CC-BY 4.0

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Description

This dataset consists of all the epimegabenthic fauna marked and enumerated from two seafloor georeferenced image mosaics from the shelf off Svalbard's Hornsund fjord (Hornsundbanken). Videos of the seafloor were obtained with the the remotely operated vehicle (ROV) Ægir from the research vessel Kronprins Haakon, maintaining an altitude of between 1 and 1.5 m. Images were extracted every 3 seconds via the free software ffmpeg and using the images and their associated navigation data, georeferenced mosaics were generated with Agisoft's Metashape software. The two mosaics cover areas of 282 m2 and 164 m2 (446 m2 combined). The mosaics were inputted into Arc Desktop and using the Editor tool, all fauna were identified, marked and enumerated. All individuals were marked to obtain numbers for each taxon. Colonial or encrusting animals were outlined to obtain areal coverage. Identifications were made to the lowest possible level which was species in many cases, but only phylum in some cases. The faunal data from these mosaics were used in the publication by Sen et al. Fauna of shallow water Arctic seep not driven by water masses currently under review.

Enregistrements de données

Les données de cette ressource occurrence ont été publiées sous forme dune Archive Darwin Core (Darwin Core Archive ou DwC-A), le format standard pour partager des données de biodiversité en tant quensemble dun ou plusieurs tableurs de données. Le tableur de données du cœur de standard (core) contient 68 enregistrements.

Cet IPT archive les données et sert donc de dépôt de données. Les données et métadonnées de la ressource sont disponibles pour téléchargement dans la section téléchargements. Le tableau des versions liste les autres versions de chaque ressource rendues disponibles de façon publique et permet de tracer les modifications apportées à la ressource au fil du temps.

Versions

Le tableau ci-dessous naffiche que les versions publiées de la ressource accessibles publiquement.

Comment citer

Les chercheurs doivent citer cette ressource comme suit:

Sen A, Caudan C, Rodés N, Hong W L, ten Hietbrink S, Szymczycha B, Diak M, Broms F, Knies J (2026). Epimegabenthos based on seafloor georeferenced mosaics of the Hornsundbanken methane seep area. Version 1.1. The University Centre in Svalbard. Occurrence dataset. https://ipt.gbif.no/resource?r=epimegabenthos_hornsundbanken_seep&v=1.1

Droits

Les chercheurs doivent respecter la déclaration de droits suivante:

L’éditeur et détenteur des droits de cette ressource est The University Centre in Svalbard. Ce travail est sous licence Creative Commons Attribution (CC-BY) 4.0.

Enregistrement GBIF

Cette ressource a été enregistrée sur le portail GBIF, et possède lUUID GBIF suivante : 11cd1b4f-0d2e-418b-8b22-5e00f2308187.  The University Centre in Svalbard publie cette ressource, et est enregistré dans le GBIF comme éditeur de données avec lapprobation du GBIF Norway.

Mots-clé

Occurrence

Contacts

Arunima Sen
  • Auteur
  • Associate Professor
The University Centre in Svalbard (UNIS)
Longyearbyen
NO
Corentin Caudan
  • Créateur
  • student
Sorbonne University
Nil Rodés
  • Créateur
  • engineer
The University Centre in Svalbard (UNIS)
Wei Li Hong
  • Créateur
  • Associate Professor
Stockholm University
Sophie ten Hietbrink
  • Créateur
  • student
Stockholm University
Beata Szymczycha
  • Créateur
  • Associate Professor
Institute of Oceanology Polish Academy of Sciences (IOPAN)
Magdalena Diak
  • Créateur
  • Researcher
Institute of Oceanology Polish Academy of Sciences (IOPAN)
Fredrik Broms
  • Créateur
  • Researcher
North Norwegian Humpback Whale Catalogue (NNHWC)
Jochen Knies
  • Créateur
  • Researcher
Norwegian Geological Survey (NGU), iC3: Centre for ice, Cryosphere, Carbon and Climate
Arunima Sen
  • Auteur
  • Associate Professor
The University Centre in Svalbard (UNIS)
Longyear
NO

Couverture géographique

Continental shelf off the Hornsund fjord of Svalbard, known as Hornsundbanken

Enveloppe géographique Sud Ouest [76,791, 14,159], Nord Est [76,793, 14,168]

Couverture taxonomique

N/A

Phylum Chordata, Mollusca, Arthropoda, Porifera, Nemertea, Cnidaria, Annelida, Echinodermata

Couverture temporelle

Date de début 2023-03-06

Données sur le projet

Epimegabenthic fauna marked in a GIS (Geographic Information System) from two georeferenced mosaics constructed from still images obtained from ROV (remotely operated vechicle) video.

Titre Epimegabenthos based on seafloor georeferenced mosaics of the Hornsundbanken methane seep area
Financement Arctic SGD (Submarine groundwater discharge) project (The Norwegian Financial Mechanism 2014-2021, project number 019/34/H/ ST10/00645 and 2019/34/H/ST10/00504).

Les personnes impliquées dans le projet:

Arunima Sen
  • Auteur

Méthodes déchantillonnage

Numerous gas flares (gas bubbles escaping from the seafloor) have been detected acoustically on the shelf off the Hornsund fjord of Svalbard (known as Hornsundbanken). Using the remotely operated vehicle (ROV) Ægir from the research vessel Kronprins Haakon, video of the seafloor was recorded, maintaining an altitude of about 1-1.5 m. The HD video camera of the ROV was facing directly downwards (perpendicular to the seafloor) for the imaging process. Video acquisition was performed in a lawn-mower pattern, ensuring at least 25% overlap between adjacent lines. Images were extracted from the video every 2 seconds using the free software, ffmpeg. Navigation coordinates for each image were obtained from the ROV's track. These images were stitched together to create a single, composite georeferenced image (mosaic) of the seafloor. For this, structure-from-motion photogrammetry processing was conducted using Agisoft Metashape (version 2.0.2, build number 16334). Two digital models were constructed, covering a total area of 446 m². The georeferenced mosaics were imported into ArcMap Desktop version 10.8.2 and all visible fauna were marked with the Editor tool. Individual organisms were marked as points (point feature class). Colonial or encrusting organisms were outlined to get areal coverages (polygon feature classes). Identification was done to lowest taxonomic level as possible, which was species in some cases, but often reliable identification was limited to higher levels such as genus or family and in certain cases, only phylum level.

Etendue de létude Two locations within an area of active methane seepage on the seafloor on the continental shelf off the Hornsund fjord of Svalbard (Hornsundbanken).

Description des étapes de la méthode:

  1. Video imaging of the seafloor was conducted via the downward facing HD camera on the ROV. Overlap was maintained between adjacent video lines. Images were extracted from the video every three seconds and in combination with the corresponding navigation data for the images, a single, composite, georeferenced image (mosaic) was created via Agisoft's Metashape software. Two mosaics were generated. The mosaics were inputted into ArcMap Desktop and all visible features and fauna were marked and enumerated.