Catalogue GéoSAS
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.
Simple
- Date ( Creation )
- 2025-03-05T16:00:00
- Edition
- 2025
- 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
- Maintenance and update frequency
- As needed
- Maintenance note
- Last update: 05/03/2024 with autumn 2024 data
- Keywords ( Theme )
-
- Open data
- Keywords ( Theme )
-
- Limit
- Thèmes INSPIRE Thèmes INSPIRE INSPIRE themes ( Theme )
-
- Environmental monitoring facilities
- Environnement
- GEMET GEMET ( Theme )
-
- 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
- Metadata 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
- Name
- ESRI Shapefile
- Version
- 1.0
- OnLine resource
- Selune Observatory ( WWW:LINK-1.0-http--link )
- OnLine resource
-
v_bioc_biofilm_chloro_bt_spectro_biofilm
(
OGC:WMS
)
Mesures de chlorophylle-a par spectrographie et bentotorch basés sur les biofilms photosynthétiques - Observatoire Sélune
- OnLine resource
-
selune:v_bioc_biofilm_chloro_bt_spectro_biofilm
(
OGC:WFS
)
Mesures de chlorophylle-a par spectrographie et bentotorch basés sur les biofilms photosynthétiques - Observatoire Sélune
- OnLine resource
- Download ‘Chlorophyll-a measurements by spectrography and bentotorch based on photosynthetic biofilms - Sélune Observatory’ in JSON format ( WWW:DOWNLOAD-1.0-http--download )
- OnLine resource
- Download "Chlorophyll-a measurements by spectrography and bentotorch based on photosynthetic biofilms - Sélune Observatory" in CSV format ( WWW:DOWNLOAD-1.0-http--download )
- OnLine resource
- Download "Chlorophyll-a measurements by spectrography and bentotorch based on photosynthetic biofilms - Sélune Observatory" in shapefile format ( WWW:DOWNLOAD-1.0-http--download )
- Hierarchy level
- Dataset
Conformance result
- 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.
gmd:MD_Metadata
- File identifier
- 991305b9-43bb-4acc-ae31-03e8ed147eb7 XML
- Metadata language
- fre
- Character set
- UTF8
- Parent identifier
- Sélune biotic and abiotic observatory e91b4cb1-252d-4ae9-bdf4-24366af7a87c
- Hierarchy level
- Dataset
- Date stamp
- 2025-11-06T16:23:54
- Metadata standard name
- ISO 19115
- Metadata standard version
- 1.0
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