Chlorophyll-a measurements by spectrography and bentotorch based on photosynthetic biofilms - Sélune Observatory

Microbial communities play a major role in the functioning of ecosystems: they are at the base of the food chain (primary production) and participate in the degradation of organic matter. These communities are also known to respond rapidly to environmental changes. Like macro-invertebrates, they can be used as ecological indicators.

Benthic diatoms are the main photosynthetic organisms in this biological community. The relative abundance of the different species is used to calculate an environmental quality index (EQI). Major differences in communities between the upstream and downstream zones were observed when the dams were in place. These differences will change once the dams are removed.

As part of the Sélune observatory, pilot stations have been set up along the main course of the Sélune, distributed from upstream to downstream of the hydroelectric dams. Three stations are located in the former reservoirs of the dams, while the other two, known as the reference stations, are outside the area of influence of the former dams (one downstream and the other upstream). At these stations, aquatic biocenoses (including benthic macroinvertebrates, biofilms, macrophytes, etc.) are monitored. Since September 2014, the stations are ideally sampled every month from April to October (7 annual surveys) using artificial substrates (glass slides placed in the water). In addition to the diatom survey (floristic list, IBD calculation), the chlorophyll-a concentration is measured.

During each campaign, an INRAe experimental sampling protocol is implemented. This protocol involves the immersion (1 month) of glass slides, an in situ measurement of the chlorophyll-a concentration via BentoTorch and then the collection of the biofilm on these glass slides. The biofilm is conditioned in (1) 99.9% ethanol to determine IBDs and floristic lists (outsourced service, based on standard NF T90-354) and (2) mineral water to measure chlorophyll-a concentration using a spectrometer.

NB: the year 2023 is not covered in terms of measuring chlorophyll-a concentration via spectrometry due to a problem with the low-temperature storage of samples.

This dataset provides measurements of the average daily concentration of chlorophyll-a and pheopigment in µg/cm2/day.

Date (Creation): 2025-03-05T16:00:00

Edition: 2025

Citation identifier: fr-20250303103810-umrsas-selune-v_bioc_biofilm_chloro_bt_spectro_biofilm

Purpose: This layer gives the results obtained for measurements of chlorophyll-a (bentoTorch and spectrometry) and pheopigment

Status: On going

Point of contact

Organisation name	Individual name	Electronic mail address	Role
INRAE DECOD	Jean-Marc Roussel	jean-marc.roussel@inrae.fr	Point of contact
INRAE DECOD	Gorzérino Caroline	caroline.gorzerino@inrae.fr	Point of contact
AESN		aesn@aesn.fr	funder
Université de Rennes	Pannard Alexandrine	alexandrine.pannard@univ-rennes.fr	Point of contact
INRAE U3E	Nadine Herrard	nadine.herrard@inrae.fr	Custodian

Maintenance and update frequency: As needed

Maintenance note: Last update: 05/03/2024 with autumn 2024 data

Theme

Open data

Theme

Limit

INSPIRE themes

Environmental monitoring facilities
Environnement

GEMET

biology
environment
fauna

Use limitation: Unrestricted use subject to the following compulsory wording on all distribution documents: "Source: INRAE - U3E".

Use limitation: Open licence : https://www.etalab.gouv.fr/licence-ouverte-open-licence

Access constraints: Other restrictions

Use constraints: License

Other constraints: No public access restriction

Spatial representation type: Vector

Denominator: 25000

Language: fre

Topic category

Environment
Location

Begin date: 2014-01-01

End date: 2027-12-31

Reference system identifier: RGF93 / Lambert-93 (EPSG:2154)

Geometric object type: Point

Distributor

Distributor contact

Organisation name	Individual name	Electronic mail address	Role
UMR 1069 SAS INRA - Agrocampus Ouest	Pole GéoSAS	geosas_adm@framalistes.org	Distributor

Distributor format

Name	Version
ESRI Shapefile	1.0

OnLine resource

Protocol	Linkage	Name
WWW:LINK-1.0-http--link	https://programme-selune.com/fr/observatoire/	Selune Observatory
OGC:WMS	https://geosas.fr/geoserver/selune/ows?service=WMS	v_bioc_biofilm_chloro_bt_spectro_biofilm
OGC:WFS	https://geosas.fr/geoserver/selune/ows?service=WFS	selune:v_bioc_biofilm_chloro_bt_spectro_biofilm
WWW:DOWNLOAD-1.0-http--download	https://geosas.fr/geoserver/selune/ows?service=WFS&version=1.0.0&request=GetFeature&typeName=selune%3Av_bioc_biofilm_chloro_bt_spectro_biofilm&outputFormat=application%2Fjson	Download ‘Chlorophyll-a measurements by spectrography and bentotorch based on photosynthetic biofilms - Sélune Observatory’ in JSON format
WWW:DOWNLOAD-1.0-http--download	https://geosas.fr/geoserver/selune/ows?service=WFS&version=1.0.0&request=GetFeature&typeName=selune%3Av_bioc_biofilm_chloro_bt_spectro_biofilm&outputFormat=csv	Download "Chlorophyll-a measurements by spectrography and bentotorch based on photosynthetic biofilms - Sélune Observatory" in CSV format
WWW:DOWNLOAD-1.0-http--download	https://geosas.fr/geoserver/selune/ows?service=WFS&version=1.0.0&request=GetFeature&typeName=selune%3Av_bioc_biofilm_chloro_bt_spectro_biofilm&outputFormat=SHAPE-ZIP	Download "Chlorophyll-a measurements by spectrography and bentotorch based on photosynthetic biofilms - Sélune Observatory" in shapefile format

Hierarchy level: Dataset

Conformance result

Title: INSPIRE Data Specification for the spatial data theme Elevation

Date (Publication): 2013-12-10

Explanation: Non Evalué

Pass: No

Statement: Floristic lists and abundances obtained in accordance with standard NF T90-354 (November 2021).

The list of fields presented in this dataset is specified in the associated catalogue.

Feature catalogue citation