Descripción
A survey started in 2006 is conducted every year in early autumn (late September to early October) to quantify the abundance of eels in the Nivelle in Pays Basque. The data consist of abundance indices and biological traits measured on the fish sampled: length, weight ... The survey is carried out under the Research Observatory on Diadromes Fishes in Coastal Streamss (ERO DiaPFC) program. The data are stored in the database of the ERO. They are used to develop predictive models and tools for providing scientific advice to improve the management of this heritage species.
Registros
Los datos en este recurso de registros biológicos 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 2.183 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.
Este IPT archiva los datos y, por lo tanto, sirve como repositorio de datos. Los datos y los metadatos del recurso están disponibles para su descarga en la sección descargas. La tabla versiones enumera otras versiones del recurso que se han puesto a disposición del público y permite seguir los cambios realizados en el recurso a lo largo del tiempo.
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:
Lange F, Bardonnet A, Daverat F, Rives J, Huchet E, Guéraud F, Marchand F (2024). Abundances and biological traits of eels sampled in the survey of eels abundance Indices in the Nivelle river (France). Version 1.3. Institut national de recherche pour l’agriculture, l’alimentation et l’environnement (INRAE). Occurrence dataset. https://ipt.gbif.fr/resource?r=inrae_nivelle_iaa&v=1.3
Derechos
Los usuarios deben respetar los siguientes derechos de uso:
El publicador y propietario de los derechos de este trabajo es Institut national de recherche pour l’agriculture, l’alimentation et l’environnement (INRAE). Esta obra está bajo una licencia Creative Commons de Atribución/Reconocimiento (CC-BY 4.0).
Registro GBIF
Este recurso ha sido registrado en GBIF con el siguiente UUID: c716f665-325c-4656-a096-fc4fd683d407. Institut national de recherche pour l’agriculture, l’alimentation et l’environnement (INRAE) publica este recurso y está registrado en GBIF como un publicador de datos avalado por GBIF France.
Palabras clave
Occurrence; Observation; population density; eel; population distribution; catch effort
Contactos
- Originador
- Originador
- Originador
- Originador
- Originador
- Originador
- Proveedor De Los Metadatos ●
- Punto De Contacto
- Programador
Cobertura geográfica
The Nivelle river in Basque Country (France). http://services.sandre.eaufrance.fr/Courdo/Fiche/client/fiche_courdo.php?CdSandre=S52-0400
| Coordenadas límite | Latitud Mínima Longitud Mínima [43,253, -1,669], Latitud Máxima Longitud Máxima [43,391, -1,467] |
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Cobertura temporal
| Fecha Inicial / Fecha Final | 0034-03-13 / 2023-09-19 |
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Métodos de muestreo
In the Nivelle, sampling is conducted at 10 sites spread along the mainstem and tributaries. The sites are visited once a year at the beginning of autumn (end of September to early October)
| Área de Estudio | Nivelle river, CdSandre=S52-0400 Latitude between 43.2426 and 43.3912; longitude between -1.4799 and -1.6694 Source latitude and longitude : 43.2173 -1.5231 Last confluence point latitude and longitude : 43.3854 -1.6639 The Nivelle is a 39 km long coastal stream of Pays Basque. It has its source in Spain and flows into the Bay of Biscay at Saint-Jean-de-Luz. Its drainage basin has a surface area of 238 km2, and is dominated by marly-calcareous formations. It is essentially agro-pastoral with more than 50% of the land area made of moors (Dumas, 2003). The oceanic climate, mild and wet (1700 mm year-1 in St-Pe´e-sur-Nivelle), provides a mean annual discharge of 5.4m3 s-1 downstream from the confluence of the main tributary, the Lurgorrieta, and 7 m3 s-1 at the mouth. The water, neutral to slightly alkaline, is of good quality upstream from Saint-Pée-sur-Nivelle, but deteriorates downstream. |
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Descripción de la metodología paso a paso:
- Fishing is operated according to the following steps : 1. Two large dip-nets with metal frames are placed facing the current, lying on the bottom, and kept at a fixed position. In the case of a watercourse of reduced width, only one is used. 2. The anode scans an area of about 2-2.5 m upstream of the dip-nets in the vein of water filtered by them. 3. Fish attracted by the anode and shocked go down into the nets guided by the electrode and driven by the water flow. If necessary, the fish stuck on the bottom or in aquatic vegetation are recovered by a small hand net. The electric field is variable, adapted to the conductivity of the water. In the areas where there are many roots or stones, the operator may have to fish longer in order to attract the fish out of their hiding place. 4. Eels are transferred into a bucket previously filled with water. 5. The whole team moves from bank to bank out of the area that has just been disturbed by the electric field, the carrier of the electrofishing gear taking care of not to step on the area he will next explore with the anode. When a bank is reached, the progression is a few meters upstream and the team goes the other way. Overall the fishing method is modeled on the principle of De Lury fishing (Fisheries by stock depletion). Each year, an identical sector with an area close to 100 m2 is inventoried using this method. Juvenile abundance is quantified by the number of individuals captured for a unit effort (Two or three fishing under the conditions specified above, depending on the quantity of individuals captured).
- Biometric measurement of the fish are recorded after their anesthesia with benzocaïne. The fish length is measured from the tip of the mouth to the fork of the caudal fin (1 millimeter precision). Fish are then weighed (0.2 g precision). All the fish sampled are then released in their original site.
Metadatos adicionales
| Identificadores alternativos | c716f665-325c-4656-a096-fc4fd683d407 |
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| https://ipt.gbif.fr/resource?r=inrae_nivelle_iaa |