Focus on IS - integration of IAS (atlantic salmon abundance) data

What data are we talking about?

This article deals specifically with the integration into the SI Sélune information system of data associated with juvenile Atlantic salmon documented as part of IAS abundance monitoring. The restoration of continuity in the Sélune will profoundly alter the distribution of fish species in the watershed. In particular, amphihaline migratory fish, notably Atlantic salmon, will once again be able to travel up and down the Sélune. These species never really left the Sélune after the dams were built a century ago. However, they were confined to the lower part of the river, up to the foot of the dams. The restoration of ecological continuity should enable them to recolonize the Sélune and its tributaries upstream of the watershed.

As part of the Sélune Observatory, field campaigns comply with the fishing protocol developed by INRAE and OFB. The aim of this method is to estimate the abundance of juvenile Atlantic salmon (Salmo salar) at a station (or sector). This protocol targets juveniles of the year (aged 0+) whose abundance reflects the renewal of generations within the population (or recruitment) and survival after the embryonic development phases under gravel and the first months of life in the open environment. Field campaigns are carried out by INRAE and the Ille-et-Vilaine and Manche Federations for Fishing and the Protection of the Aquatic Environment (FDAPPMA50 and FDAPPMA35).

The data made available in SISélune complies with INSPIRE and is based on the F.A.I.R. Data principles.

The related metadata

The paragraph below provides access to metadata records written specifically for data on Atlantic salmon abundance and catches at the Sélune observatory. These records describe the data provided, how it was acquired, and its temporal and spatial characteristics.

Three metadata records describe this data as follows:

• Atlantic salmons study Areas (IAS) by session - Sélune Observatory
• Atlantic salmons abundance (IAS) - Selune Observatory
• Atlantic salmons catches (IAS) - Selune Observatory

View / Download data

1. Via metadata

Each metadata sheet provides download links to data in CSV, JSON and shapefile (SHP) formats.

2. Via the web mapping portal

The mapping portal, accessible via the url: https://geosas.fr/selune/#, presents these datasets in the "Sélune Observatory" theme and the "Atlantic Salmon" sub-theme.

The layer “Atlantic salmon study areas (IAS - all campaigns)” 

It allows you to view the scientific electrofishing areas sampled as part of the IAS protocol (INRAe and also departmental federations).

You can change this campaign by clicking on the “V” icon located under the layer legend. This will display a drop-down list entitled “Campaign selection” allowing you to make your choice.

The layer “Abundance and catches of Atlantic salmon (IAS - all campaigns)” 

It allows you to view abundance data by age class, particularly juveniles (IAS index), by scientific fishing sector (INRAe and also departmental federations). It also allows you to view the biometric data associated with the catches made.

You can change this campaign (see below) but also change the way to view the data : Absence/Presence (default way) or abundance index classes by clicking on the “V” icon located under the layer legend. This will bring up a drop-down list “Analysis” allowing you to make your choice. 

NB : Several view mode exist for Absence/Presence to allow to choose diferent colors in order to view salmon abundance with other fish abundance.

Once this layer is displayed, you can view specific information for each station for the selected campaign, including: 

• the IAS index value (abundance of juveniles) for the selected sector and campaign,
• contextual data on fishing carried out for the selected sector and campaign,
• biometric data on all Atlantic salmon catches for the selected sector and campaign.

The details of a station also allows you to :

• access a page on the website providing context for this scientific monitoring of the observatory,
• Direct access to the metadata sheets associated with these datasets,
• download data in CSV and JSON format (shapefile format only via the metadata sheets).

3. via the map server

The access urls for the Sélune IS data layers are as follows:

• WMS : https://geosas.fr/geoserver/selune/wms
• WFS : https://geosas.fr/geoserver/selune/wfs

Layers used to retrieve IBD data :

• Atlantic salmons Study Areas (IAT) by session - Sélune Observatory: v_bioc_ias_sctr_ias_sessions
• Abundance of Atlantic salmon (IAS) - Sélune Observatory: v_bioc_ias_ab_ias
• Atlantic salmon catches (IAS) - Sélune Observatory: v_bioc_ias_ind_ias