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Original provider:
Observatoire PELAGIS UAR 3462 University La Rochelle - CNRS
Dataset credits:
Observatoire PELAGIS UAR 3462, University La Rochelle - CNRS
Abstract:
Since 2003, the Observatoire PELAGIS (La Rochelle University) participated to annual halieutic surveys, led by the IFREMER, to collect data on the distribution of marine top predators in order to estimate their relative abundance and preferred habitats in the Bay of Biscay, the Channel and the North Sea.
Each year, three observers take place on board the vessel “Thalassa” to record sightings of seabirds, marine mammals, large fish and fishing boats, from dawn to dusk. Following distance sampling methods, visual censuses are made by two observers (while the third observer is resting) from the upper platform of the boat (min. 14m above the sea level). They are placed on each side of the deck, looking ahead for marine predator with an angle of 180°. For each sighting, the species and the number of individuals are recorded, as well as the behaviour, distance and angle (upon request).
Purpose:
One of the main advantages of this survey lays in its ecosystemic approach, which provides information on all the components of the food web (from planktonic organisms to predators) as well as data on the environmental parameters (sea surface temperature, salinity…). Interactions between prey and predators are complex in marine ecosystems, which are submitted to strong spatio-temporal variations. Thanks to ecosystem-based surveys, observed distributions and densities of marine predators can be related to the occurrence of their prey, providing to scientists and managers a better understanding of the marine ecosystems structure.
Supplemental information:
[2022-01-18] Data in 2020 and 2021 were appended.
[2018-04-26] Data in 2016 and 2017 were appended.
Time and group size of the sightings are not available online. They may be released upon request.
Link GBIF portal : https://www.gbif.org/dataset/d135ba77-9d68-466b-bff9-8d1a0c53b7d7
Project :
Title : Observatoire Pelagis boat surveys 2003-2021
Abstract :
Funding : NA
Contact : ()
Key words
No information
Field
continental
marine
Protocole
No information
Geographic extent
Contacts
Type
Organization
Name
Fournisseur
Observatoire Pelagis UMS 3462, University La Rochelle - CNRS
DOREMUS Ghislain
Fournisseur
Observatoire PELAGIS, UMS 3462, University La Rochelle-CNRS
PELTIER Hélène
Fournisseur
Observatoire PELAGIS, UMS 3462, University La Rochelle-CNRS
PELTIER Hélène
Producteur
Observatoire Pelagis UMS 3462, University La Rochelle - CNRS
DOREMUS Ghislain
Fournisseur
PATRINAT (OFB-MNHN-CNRS-IRD)
Publication dates :
First diffusion : 14/03/2023
Last update : 30/11/2023
Species list found :
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CD_NOM
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Sheet
Chiffres clés :
73326 données
108 espèces
108 taxons
Répartition des données par groupes taxonomiques :