Distribution of Macroalgae in the area of Calvi (Corsica, Mediterranean Sea)
Última versión Publicado por Université Libre de Bruxelles (ULB) en 25 de junio de 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 EML RTF Versiones Derechos Citar
Registros

Los datos en este evento de muestreo recurso han sido publicados como Archivo Darwin Core(DwC-A), el cual es un formato estándar para compartir datos de biodiversidad como un conjunto de una o más tablas de datos. La tabla de datos del core contiene 17 registros.

también existen 1 tablas de datos de extensiones. Un registro en una extensión provee información adicional sobre un registro en el core. El número de registros en cada tabla de datos de la extensión se ilustra a continuación.

  • Event (core)
    17
  • Occurrence 
    137

Este IPT archiva los datos, sirviendo así como repositorio de datos. Los datos y metadatos están disponibles para descargar en la sección de descargas. La tabla de versiones muestra otras versiones del recurso que se han hecho accesibles al público y permite el seguimiento de los cambios hechos al recurso en el tiempo.

Descargas

Descargue la última versión de los datos como un Archivo Darwin Core (DwC-A) o los metadatos como EML o RTF:

Datos como un archivo DwC-A descargar 17 registros en Inglés (8 kB) - Frecuencia de actualización: no planeado
Metadatos como un archivo EML descargar en Inglés (19 kB)
Metadatos como un archivo RTF descargar en Inglés (13 kB)
Versiones

La siguiente tabla muestra sólo las versiones publicadas del recurso que son de acceso público.

¿Cómo referenciar?

Los usuarios deben citar este trabajo de la siguiente manera:

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

Derechos

Los usuarios deben respetar los siguientes derechos de uso:

El publicador y propietario de los derechos de este trabajo es Université Libre de Bruxelles (ULB). This work is licensed under a Creative Commons Attribution (CC-BY) 4.0 License.

Registro GBIF

Este recurso ha sido registrado en GBIF con el siguiente UUID: e82beebb-d3ce-4236-a46f-aec303d1cc86.  Université Libre de Bruxelles (ULB) publica este recurso, y está registrado en GBIF como un publicador de datos avalado por Belgian Biodiversity Platform.

Palabras Clave

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

Contactos

¿Quién puede resolver dudas acerca del recurso?:

¿Quién documentó los metadatos?:

Lea Katz
Student
Université Libre de Bruxelles
Brussels
BE
https://biomar.ulb.ac.be/

¿Quién más está asociado con el recurso?:

Autor
Lea Katz
Student
Université Libre de Bruxelles
BE
Autor
Bruno Danis
Associate Professor
Université Libre de Bruxelles
BE
http://biomar.ulb.ac.be
Cobertura Geográfica

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.

Coordenadas límite Latitud Mínima Longitud Mínima [42,553, 8,709], Latitud Máxima Longitud Máxima [42,617, 8,83]
Cobertura Taxonómica

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

Orden  Corralinales
Género  Dictyota,  Halopteris,  Jania
Especie  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
Cobertura Temporal
Fecha Inicial / Fecha Final 2016-07-17 / 2016-07-21
Fecha Inicial / Fecha Final 2019-06-05 / 2019-06-07
Datos del Proyecto

Master's thesis.

Título Evaluation of ROV imagery for the study of macroalgae communities in the Bay of Calvi, Corsica. Master Thesis
Fuentes de Financiación 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).
Descripción del Área de Estudio 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.
Descripción del Diseño 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).

Personas asociadas al proyecto:

Autor
Lea Katz
Métodos de Muestreo

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.

Área de Estudio 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.
Control de Calidad 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.

Descripción de la metodología paso a paso:

  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).
Metadatos Adicionales
Identificadores Alternativos e82beebb-d3ce-4236-a46f-aec303d1cc86
https://ipt.biodiversity.be/resource?r=macroalgae_of_calvi