Distribution of Macroalgae in the area of Calvi (Corsica, Mediterranean Sea)
最新版本 由 Université Libre de Bruxelles (ULB) 發佈於 2021年6月25日 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 EML RTF 版本 權利 引用此資源

此資源sampling event的資料已發佈為達爾文核心集檔案(DwC-A),其以一或多組資料表構成分享生物多樣性資料的標準格式。 核心資料表包含 17 筆紀錄。

亦存在 1 筆延伸集的資料表。延伸集中的紀錄補充核心集中紀錄的額外資訊。 每個延伸集資料表中資料筆數顯示如下。

  • Event (核心)
  • Occurrence 

此 IPT 存放資料以提供資料儲存庫服務。資料與資源的詮釋資料可由「下載」單元下載。「版本」表格列出此資源的其它公開版本,以便利追蹤其隨時間的變更。


下載最新版本的 Darwin Core Archive (DwC-A) 資源,或資源詮釋資料的 EML 或 RTF 文字檔。

DwC-A資料集 下載 17 紀錄 在 English 中 (8 kB) - 更新頻率: 無計畫更新
元數據EML檔 下載 在 English 中 (19 kB)
元數據RTF文字檔 下載 在 English 中 (13 kB)




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



此資料的發布者及權利單位為 Université Libre de Bruxelles (ULB)。 This work is licensed under a Creative Commons Attribution (CC-BY) 4.0 License.


此資源已向GBIF註冊,並指定以下之GBIF UUID: e82beebb-d3ce-4236-a46f-aec303d1cc86。  Université Libre de Bruxelles (ULB) 發佈此資源,並經由Belgian Biodiversity Platform同意向GBIF註冊成為資料發佈者。


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




Lea Katz
Université Libre de Bruxelles


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

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.

界定座標範圍 緯度南界 經度西界 [42.553, 8.709], 緯度北界 經度東界 [42.617, 8.83]

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
起始日期 / 結束日期 2016-07-17 / 2016-07-21
起始日期 / 結束日期 2019-06-05 / 2019-06-07

Master's thesis.

計畫名稱 Evaluation of ROV imagery for the study of macroalgae communities in the Bay of Calvi, Corsica. Master Thesis
經費來源 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).
研究區域描述 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.
研究設計描述 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).


Lea Katz

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.

研究範圍 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.
品質控管 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.


  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).
替代的識別碼 e82beebb-d3ce-4236-a46f-aec303d1cc86