https://ipt.biodiversity.be/resource?r=macroalgae_of_calvi
Distribution of Macroalgae in the area of Calvi (Corsica, Mediterranean Sea)
Lea
Katz
Université Libre de Bruxelles
Student
Brussels
BE
lea.katz@ulb.be
https://biomar.ulb.ac.be/
Lea
Katz
Université Libre de Bruxelles
Student
Brussels
BE
lea.katz@ulb.be
https://biomar.ulb.ac.be/
Lea
Katz
Université Libre de Bruxelles
Student
BE
lea.katz@ulb.be
author
Damien
Sirjacobs
Université de Liège
Researcher
BE
0000-0002-1770-2063
author
Bruno
Danis
Université Libre de Bruxelles
Associate Professor
BE
bdanis@ulb.ac.be
http://biomar.ulb.ac.be
0000-0002-9037-7623
author
2021-02-01
eng
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 racemosa, 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.
Occurrence
GBIF Dataset Type Vocabulary: http://rs.gbif.org/vocabulary/gbif/dataset_type.xml
Observation
GBIF Dataset Subtype Vocabulary: http://rs.gbif.org/vocabulary/gbif/dataset_subtype.xml
Macroalgae
Corsica
Calvi
biodiversity
benthic communities
ROV
underwater imagery
invasive species
coverage
photogrammetry
n/a
This work is licensed under a Creative Commons Attribution (CC-BY) 4.0 License.
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.
8.709
8.83
42.617
42.553
2016-07-17
2016-07-21
2019-06-05
2019-06-07
Most algae were identified to genus or species, encrusting algae were identified as “Corralinales”.
species
Acetabularia acetabulum
species
Amphiroa rigida
species
Caulerpa prolifera
species
Caulerpa racemosa
species
Codium bursa
species
Colpomenia sinuosa
order
Corralinales
species
Cystoseira brachycarpa
species
Cystoseira crinita
species
Cystoseira spinosa
species
Cystoseira zosteroides
genus
Dictyota
species
Flabellia petiolata
genus
Halopteris
species
Halopteris scoparia
genus
Jania
species
Osmundaria volubilis
species
Padina pavonica
species
Peyssonnelia squamaria
notPlanned
Lea
Katz
Université Libre de Bruxelles
Student
Brussels
BE
lea.katz@ulb.be
https://biomar.ulb.ac.be/
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).
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.
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.
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.
Evaluation of ROV imagery for the study of macroalgae communities in the Bay of Calvi, Corsica. Master Thesis
Lea
Katz
author
Master's thesis.
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).
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.
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 racemosa (an invasive macroalgae in the region).
2020-11-23T09:16:56.647+00:00
dataset
Katz L (2021): Distribution of Macroalgae in the area of Calvi (Corsica, Mediterranean Sea). v1.1. Université Libre de Bruxelles (ULB). Dataset/Occurrence. https://ipt.biodiversity.be/resource?r=macroalgae_of_calvi&v=1.1
https://ipt.biodiversity.be/resource?id=macroalgae_of_calvi/v1.1.xml