Distribution of Macroalgae in the area of Calvi (Corsica, Mediterranean Sea)
Dernière version Publié par Université Libre de Bruxelles (ULB) le 25 juin 2021 Université Libre de Bruxelles (ULB)

This dataset describes the occurrences of 19 species of macroalgae along standardized transects in the Bay of Calvi (Corsica). This dataset was based on 2 different campaigns (one in 2016 and one in 2019) in the Bay of Calvi. In both campaigns, an underwater remotely operated vehicle (ROV) was deployed in the Bay and navigated along straight transects perpendicular to the coastline. The ROV was equipped with a down-looking GoPro camera, to capture footage of the bottom, and a built-in front-looking camera to capture a general view of the landscape and navigation. Algae were identified and their coverage was quantified using the down-looking videos.

The species of macroalgae are the following : Acetabularia acetabulum, Amphiroa rigida, Caulerpa prolifera, Caulerpa cylindracea, Codium bursa, Colpomenia sinuosa, Corralinales (order), Cystoseira brachycarpa, Cystoseira crinita, Cystoseira spinosa, Cystoseira zosteroides, Dictyota (genus), Flabellia petiolata, Halopteris (genus), Halopteris scoparia, Jania (genus), Osmundaria volubilis, Padina pavonica, Peyssonnelia squamaria.

In this project, each of the "events" represent different transects navigated by the ROV. The points on the map are the location of the beginning of each transect (located on the coast). From this point, the ROV navigated perpendicularly to the coast until the end of the rocky shore. The actual geographic position of each algae is not recorded, but only the presence of each algae species along this transect.

GBIF DwC-A Fichier EML RTF Versions Droits Citer ceci
Enregistrements de données

Les données de cette ressource données d'échantillonnage ont été publiées sous forme d'une Archive Darwin Core (Darwin Core Archive ou DwC-A), le format standard pour partager des données de biodiversité en tant qu'ensemble d'un ou plusieurs tableurs de données. Le tableur de données du cœur de standard (core) contient 17 enregistrements.

1 tableurs de données d'extension existent également. Un enregistrement d'extension fournit des informations supplémentaires sur un enregistrement du cœur de standard (core). Le nombre d'enregistrements dans chaque tableur de données d'extension est illustré ci-dessous.

  • Event (noyau)
  • Occurrence 

Cet IPT archive les données et sert donc de dépôt de données. Les données et métadonnées des ressources sont disponibles au 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.


Téléchargez la dernière version de la ressource en tant qu'Archive Darwin Core (DwC-A), ou les métadonnées de la ressource au format EML ou RTF :

Données sous forme de fichier DwC-A (zip) télécharger 17 enregistrements dans Anglais (8 kB) - Fréquence de mise à jour: non planifié
Métadonnées sous forme de fichier EML télécharger dans Anglais (19 kB)
Métadonnées sous forme de fichier RTF télécharger dans Anglais (13 kB)

Le tableau ci-dessous n'affiche que les versions publiées de la ressource accessibles publiquement.

Comment citer

Les chercheurs doivent citer cette ressource comme suit:

Katz L, Sirjacobs D, Danis B (2021): Distribution of Macroalgae in the area of Calvi (Corsica, Mediterranean Sea). v1.7. Université Libre de Bruxelles (ULB). Dataset/Samplingevent. https://ipt.biodiversity.be/resource?r=macroalgae_of_calvi&v=1.7


Les chercheurs doivent respecter la déclaration de droits suivante:

L’éditeur et détenteur des droits de cette ressource est Université Libre de Bruxelles (ULB). This work is licensed under a Creative Commons Attribution (CC-BY) 4.0 License.

Enregistrement GBIF

Cette ressource a été enregistrée sur le portail GBIF, et possède l'UUID GBIF suivante : e82beebb-d3ce-4236-a46f-aec303d1cc86.  Université Libre de Bruxelles (ULB) publie cette ressource, et est enregistré dans le GBIF comme éditeur de données avec l'approbation du Belgian Biodiversity Platform.


Occurrence; Macroalgae; Corsica; Calvi; biodiversity; benthic communities; ROV; underwater imagery; invasive species; coverage; photogrammetry


Personne ayant créé cette ressource:

Personne pouvant répondre aux questions sur la ressource:

Personne ayant renseigné les métadonnées:

Lea Katz
Université Libre de Bruxelles

Autres personnes associées à la ressource:

Lea Katz
Université Libre de Bruxelles
Bruno Danis
Associate Professor
Université Libre de Bruxelles
Couverture géographique

The area of interest is the Bay of Calvi. Total coverage of the dataset is the extent of 17 ROV transects (12 carried out in 2016, 5 in 2019), perpendicular to coast line. Transects are distributed in the whole Bay of Calvi, Corsica (Mediterranean Sea). More specifically, the area between Punta Revellata and Punta Spano was the focus of our study.

Enveloppe géographique Sud Ouest [42,553, 8,709], Nord Est [42,617, 8,83]
Couverture taxonomique

Most algae were identified to genus or species, encrusting algae were identified as “Corralinales”.

Order  Corralinales
Genus  Dictyota,  Halopteris,  Jania
Species  Acetabularia acetabulum,  Amphiroa rigida,  Caulerpa prolifera,  Caulerpa cylindracea,  Codium bursa,  Colpomenia sinuosa,  Cystoseira brachycarpa,  Cystoseira crinita,  Cystoseira spinosa,  Cystoseira zosteroides,  Flabellia petiolata,  Halopteris scoparia,  Osmundaria volubilis,  Padina pavonica,  Peyssonnelia squamaria
Couverture temporelle
Date de début / Date de fin 2016-07-17 / 2016-07-21
Date de début / Date de fin 2019-06-05 / 2019-06-07
Données sur le projet

Master's thesis.

Titre Evaluation of ROV imagery for the study of macroalgae communities in the Bay of Calvi, Corsica. Master Thesis
Financement This project was driven by Lea Katz's master thesis, co-supervised by Damien Sirjacobs and Sylvie Gobert (Université de Liège) and by Bruno Danis (Université Libre de Bruxelles). The project received logistics support from the STARESO station, Université de Liège (Pierre Lejeune).
Description du domaine d'étude / de recherche The area of interest was the near-shore area of the Bay of Calvi. In particular, rocky bottoms, areas around Posidonia meadows and few bare sediment areas. Analyzed area covered the 0-40m depth layer.
Description du design The goal of this Master’s thesis was to evaluate underwater ROV imagery for the study of macroalgae communities and to assess the current state of macroalgae diversity in the Bay of Calvi. We also compared the current diversity data with older macroalgae diversity data. A secondary goal was to assess the invasion of Caulerpa cylindracea (an invasive macroalgae in the region).

Les personnes impliquées dans le projet:

Lea Katz
Méthodes d'échantillonnage

Each transect was filmed by GoPro cameras attached to an underwater Remotely Operated Vehicle (ROV). Videos were visualised and annotated using the software "COVER" (Carré 2010). For each transect, species were identified and relative cover and abundance were estimated.

Etendue de l'étude The study is based on 2 sampling campaigns. Both campaigns covered the same area (see "geographic coverage"). The lenght of the transects is variable but is around 100m in general. The first one occurred in july 2016 and was performed over several days. Each transect was observed 1 time. The second campaign took place in june 2019. Again, several days were needed to observe the different transects. Each transect was observed 1 time.
Contrôle qualité In some videos, species identification was validated by another algae specialist (Damien Sirjacobs, Université de Liège). We also replicated one transect with a team of divers who did their own identifications. This proved that our ROV/video method was strong and provided similar results.

Description des étapes de la méthode:

  1. For each transect : - an underwater ROV was navigated at approximately 1m from the bottom in a straight line perpendicular to the shore. It was equipped with cameras filming the bottom and the surroundings. - in the lab, down-looking video was analysed and annotated. Species are identified. Information about depth, salinity, temperature and cover were retrieved for each algae observation. - abundances of different macroalgae were compared between transects (spatial comparisons) and between different years (temporal comparisons).
Métadonnées additionnelles
Identifiants alternatifs e82beebb-d3ce-4236-a46f-aec303d1cc86