說明
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.
資料紀錄
此資源出現紀錄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 2,183 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。
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。
版本
以下的表格只顯示可公開存取資源的已發布版本。
如何引用
研究者應依照以下指示引用此資源。:
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
權利
研究者應尊重以下權利聲明。:
此資料的發布者及權利單位為 Institut national de recherche pour l’agriculture, l’alimentation et l’environnement (INRAE)。 This work is licensed under a Creative Commons Attribution (CC-BY 4.0) License.
GBIF 註冊
此資源已向GBIF註冊，並指定以下之GBIF UUID: c716f665-325c-4656-a096-fc4fd683d407。 Institut national de recherche pour l’agriculture, l’alimentation et l’environnement (INRAE) 發佈此資源，並經由GBIF France同意向GBIF註冊成為資料發佈者。
關鍵字
Occurrence; Observation; population density; eel; population distribution; catch effort
聯絡資訊
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- 程式設計師
地理涵蓋範圍
The Nivelle river in Basque Country (France). http://services.sandre.eaufrance.fr/Courdo/Fiche/client/fiche_courdo.php?CdSandre=S52-0400
| 界定座標範圍 | 緯度南界 經度西界 [43.253, -1.669], 緯度北界 經度東界 [43.391, -1.467] |
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時間涵蓋範圍
| 起始日期 / 結束日期 | 0034-03-13 / 2023-09-19 |
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取樣方法
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)
| 研究範圍 | 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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方法步驟描述:
- 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.
額外的詮釋資料
| 替代的識別碼 | c716f665-325c-4656-a096-fc4fd683d407 |
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| https://ipt.gbif.fr/resource?r=inrae_nivelle_iaa |