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Distribution of Macroalgae in the area of Calvi (Corsica, Mediterranean Sea)

Citation

Katz L, Sirjacobs D, Danis B (2021). Distribution of Macroalgae in the area of Calvi (Corsica, Mediterranean Sea). Version 1.7. Université Libre de Bruxelles (ULB). Sampling event dataset https://doi.org/10.15468/7esudn accessed via GBIF.org on 2025-06-15.

Description

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.

Sampling Description

Study Extent

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.

Sampling

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.

Quality Control

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.

Method steps

  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).

Taxonomic Coverages

Most algae were identified to genus or species, encrusting algae were identified as “Corralinales”.
  1. Acetabularia acetabulum
    rank: species
  2. Amphiroa rigida
    rank: species
  3. Caulerpa prolifera
    rank: species
  4. Caulerpa cylindracea
    rank: species
  5. Codium bursa
    rank: species
  6. Colpomenia sinuosa
    rank: species
  7. Corralinales
    rank: order
  8. Cystoseira brachycarpa
    rank: species
  9. Cystoseira crinita
    rank: species
  10. Cystoseira spinosa
    rank: species
  11. Cystoseira zosteroides
    rank: species
  12. Dictyota
    rank: genus
  13. Flabellia petiolata
    rank: species
  14. Halopteris
    rank: genus
  15. Halopteris scoparia
    rank: species
  16. Jania
    rank: genus
  17. Osmundaria volubilis
    rank: species
  18. Padina pavonica
    rank: species
  19. Peyssonnelia squamaria
    rank: species

Geographic Coverages

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.

Bibliographic Citations

Contacts

Lea Katz
originator
position: Student
Université Libre de Bruxelles
Brussels
BE
email: lea.katz@ulb.be
homepage: https://biomar.ulb.ac.be/staff/phds/lea-katz/
userId: https://orcid.org/0000-0001-5748-602X
Damien Sirjacobs
originator
position: Researcher
Université de Liège
Liège
BE
email: d.sirjacobs@ulg.ac.be
homepage: http://www.phytosystems.ulg.ac.be/en/groups/eukaryotic-phylogenomics/members/damien-sirjacobs
Bruno Danis
originator
position: Associate Professor
Université Libre de Bruxelles
Brussels
email: bdanis@ulb.ac.be
homepage: https://biomar.ulb.ac.be/staff/academics/bruno-danis/
userId: https://orcid.org/0000-0002-9037-7623
Lea Katz
metadata author
position: Student
Université Libre de Bruxelles
Brussels
BE
email: lea.katz@ulb.be
homepage: https://biomar.ulb.ac.be/
Lea Katz
author
position: Student
Université Libre de Bruxelles
BE
email: lea.katz@ulb.be
Damien Sirjacobs
author
position: Researcher
Université de Liège
BE
homepage: http://www.phytosystems.ulg.ac.be/en/groups/eukaryotic-phylogenomics/members/damien-sirjacobs
userId: http://orcid.org/0000-0002-1770-2063
Bruno Danis
author
position: Associate Professor
Université Libre de Bruxelles
BE
email: bdanis@ulb.ac.be
homepage: http://biomar.ulb.ac.be
userId: http://orcid.org/0000-0002-9037-7623
Lea Katz
administrative point of contact
position: Student
Université Libre de Bruxelles
Brussels
BE
email: lea.katz@ulb.be
homepage: https://biomar.ulb.ac.be/staff/phds/lea-katz/
userId: https://orcid.org/0000-0001-5748-602X
Damien Sirjacobs
administrative point of contact
position: Researcher
Université de Liège
Liège
BE
email: d.sirjacobs@ulg.ac.be
homepage: http://www.phytosystems.ulg.ac.be/en/groups/eukaryotic-phylogenomics/members/damien-sirjacobs
Bruno Danis
administrative point of contact
position: Associate Professor
Université Libre de Bruxelles
Brussels
BE
email: bdanis@ulb.ac.be
homepage: https://biomar.ulb.ac.be/staff/academics/bruno-danis/
userId: https://orcid.org/0000-0002-9037-7623
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