Catálogo de datos del IEO
Campaña: PELMED 2017
Small pelagic fish are both the keystone species of the ecosystem because of the central position they hold in the food chain and represent highly significant economic stakes for fisheries since they make up the majority of landings in the French Mediterranean (approximately 50% of catches for sardines and anchovies; Demaneche et al. 2009). So, to assess stocks and propose appropriate management methods, it is important to have both good knowledge about these species and independent fisheries data. Ifremer's fisheries science laboratory in Sète has monitored these populations since the 1990s. In 2002, the EU asked Member States to formalize certain operations by contract, in this context, the PELMED cruise was part of the extended contractual programme for biomass assessment (DCF). Therefore, each year France is obliged to assess the biomass of small pelagic species in the Mediterranean, in order to determine the stocks' status and propose management measures. These assessments are carried out in the framework of the general fisheries commission for the Mediterranean (CGPM). Since numerous countries had begun monitoring these species using acoustic methods, the MEDIAS (MEDIterannean Acoustic Surveys) scientific group was created in 2008 with the objective of standardizing the protocols. Finally, national management plans for Gulf of Lion fisheries were set up in 2014 (particularly for pelagic trawlers and purse seines) with scientific objectives touching on the biomass of small pelagics. The PELMED cruise, whose main aim is to directly assess the small pelagics biomass, is conducted therefore in a clearly institutional framework (national, European and Mediterranean). However, the scientific stakes remain just as important. Since 2008, a special situation has been observed in the Gulf of Lion, where the biomasses of sardines and anchovies (and even mackerel) have decreased synchronously. Even more unexpectedly, although the recruitment rates observed over the past few years in the species are particularly high, the populations don't seem to be growing back and their biomass is continuing to drop. This is particularly surprising in a marine ecosystem where recruitment is generally considered to be the determining factor of population dynamics for species with a short life span. The collection of biological parameters on species of small pelagics done during the previous PELMED cruises made it possible to highlight significant demographic changes (loss of large age classes, decrease in size, poorer body condition) which seem to suggest "bottom-up" population control. Therefore, the ecosystem-based nature of the PELMED cruises (from physical parameters to top predators, not to mention phyto- and zooplankton and fodder fish) appears to be crucial in understanding the dynamics of these populations. It was decided this year to stop prospecting the Catalan Sea, in order to extend the spatial coverage to the east of the Gulf in the PACA region (from Marseille to Nice). Since the narrowness of the shelf in this zone does not allow for prospecting along "classic" legs, the objective will be to validate a prospection method which is adapted to the area.
|
|
. Campaña: PELMED 2017. http://datos.ieo.es/geonetwork/srv/api/records/urn:SDN:CSR:LOCAL:SI29201707010 |
INSPIRE
Identificación
- Identificador del fichero
- urn:SDN:CSR:LOCAL:SI29201707010 XML
- Jerarquía
- Campaña/Survey Campañas
Recurso en línea
- resource_protocol
- WWW:LINK-1.0-http--related
- resource_protocol
- WWW:LINK-1.0-http--related
Identificador del recurso
- code
- urn:SDN:CSR:LOCAL:17005300
- Idioma del metadato
- Spanish; Castilian
Codificacióin
- Formato
- XML
- Versión
- 1
Proyección
- code
- World Geodetic System 84
Classification of data and services
- Categoría temática
-
- Océanos
Classification of data and services
Coupled resource
Coupled resource
Classification of data and services
Coupled resource
Coupled resource
Palabras clave
- GEMET - INSPIRE themes, version 1.0 ( Tema )
-
- Oceanographic geographical features
- SeaDataNet Ports Gazetteer ( departure_place )
-
- Sète
- SeaDataNet Ports Gazetteer ( arrival_place )
-
- Sète
- International Standards Organisation countries ( departure_country )
-
- France
- International Standards Organisation countries ( arrival_country )
-
- France
- ICES Platform Codes ( platform )
-
- L'Europe
- SeaVoX Platform Categories ( platform_class )
-
- research vessel
- SeaVoX salt and fresh water body gazetteer ( Lugar )
-
- Mediterranean Sea, Western Basin
- SeaDataNet device categories ( instrument )
-
- thermosalinographs
- single-beam echosounders
- multi-beam echosounders
- meteorological packages
- discrete water samplers
- CTD
Other keywords
Cobertura geográfica
N
S
E
W
))
Temporal reference
Extensión tempora
- Inicio
- 2017-07-01T00:00:00Z
- Fin
- 2017-08-03T00:00:00Z
Extensión tempora
- Fecha ( Creación )
- 2017-08-03
Quality and validity
- Linaje
- El Centro de datos aplica controles de calidad estandarizados a todos los datos de los que es responsable. Contacta con el Centro de datos para más información.
Conformidad
Conformidad
Conformidad
Conformidad
Conformidad
Conformidad
- Explicación
- See the referenced specification
- Explicación
- See the referenced specification
Restrictions on access and use
- Limitación de uso
- Not applicable
- Restricciones de Acceso
Restrictions on access and use
Responsible organization (s)
Contacto para el recurso
- Nombre de la organización
- Ifremer, Station de Sete
Responsible organization (s)
Contacto para el recurso
- Nombre de la organización
- Ifremer, Station de Sete
Metadata information
Contacto para el metadato
- Nombre de la organización
- Instituto Español de Oceanografía
- N/A
- Fecha
- 2021-11-29
- Idioma del metadato
- Spanish; Castilian
- Codificación
- utf8 UTF8
