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