Observations of taxon recoveries by stratum, on quadrats associated with riparian vegetation monitoring stations - Sélune Observatory

The study of riparian vegetation is based on the observation of natural plant communities spontaneously colonizing newly exposed areas following the erasure of the Vezins and La-Roche-Qui-Boit dams.

The vegetation monitoring system includes two complementary approaches:

i) a vegetation sampling method based on floristic surveys (composition & structure) carried out within a series of quadrats positioned along a transect

ii) a monitoring of the vegetation units (UV) observed within the valley

This dataset specifically concerns the overall characterization observed on each quadrat in terms of strata and concerns only the Sélune Observatory (2021-2026).

The sampling monitoring system is based on measurements distributed at different points in space (longitudinally and laterally). It aims to identify the diversity of flora and vegetation and describe the structure of emerging formations and plant communities within the neo-valley. Implemented annually (sub-annual only for 2021, before dismantling), this monitoring aims to identify and characterize the evolution trajectories of these vegetation over time.

The vegetation sampling protocol is implemented at several stations located along the course of the Sélune and at the mouth of several tributaries located in the right-of-way of the two former reservoirs. The sample of stations is supplemented by a batch of stations positioned outside the right-of-way of the two former reservoirs, downstream and upstream, which constitute so-called "reference" stations.

For each station, a transect is established perpendicular to the channel, from the bank to a reference point located at the level of the former water reservoir (i.e. 60m NGF for Vezins & 28.5m NGF for LRQB). Along this transect, 25m2 (5mx5m) quadrats are positioned according to previously set distance intervals. These quadrats (named Q1 to Q1+n) constitute the elementary unit within which abiotic (slope, texture...) and biotic (composition, structure) parameters are characterized and evaluated. The number of quadrats sampled per station varies depending on the width of the exposed bank (or transect length). It is completed by a reference quadrat, located beyond this maximum value (named Q0).

The inventory of vascular flora, i.e. herbaceous and woody plant species within the quadrats, aims to be exhaustive and to identify them up to the specific or even sub-specific rank.

The characterization of cover by plant species on a quadrat allows to present, for each quadrat, all the species identified in the field (taxonomic determination and proportion (%) of cover on the quadrat and for the stratum considered).

This layer gives, for each quadrat of each riparian vegetation monitoring station and each campaign of the Sélune Observatory from 2021 to 2026, the following information:

– Quadrat information (id, code, number and distance from its centroid to the station reference point),

– Campaign information (id, code, date, campaign),

– Station information (code, name, protocol applied, number of quadrats, code for the associated Sélune reference point and, as a result, positioning on the catchment area, distance to sea, distance to source and watercourse, watercourse reference altitude)

– Information on the transect by campaign (number and length, X, Y, LON, LAT coordinates of the reference points “NGF” and end point “bank”)

– Information concerning the identified taxa: taxonomic determination, scientific name, and vernacular, identification stratum and overlap on this stratum

– Information regarding the identification stratum: its wording "muscinal", "herbaceous", "young plant shrub", "low shrub", "high shrub" and "arborescent" as well as the height markers

– “Point” geometry (default) corresponding to the transect reference point

Date (Creation): 2026-06-29T00:00:00

Edition: 2025

Citation identifier: fr-18007003900276-umrsas-selune-v_bioc_vegriv_stra_tax_obs_qua_vegriv

Purpose: This layer aims to locate the riparian vegetation monitoring stations, the quadrats of associated riparian vegetation, by acquisition campaign, within the framework of the Sélune Observatory as well as the taxon observations, that is, their taxonomic determination as well as the proportion (%) of coverage of the quadrat on the stratum of cosidised vegetation.

Status: Under development

Point of contact

Organisation name	Individual name	Electronic mail address	Role
UMR DECOD « Dynamique et durabilité des écosystèmes : de la source à l’océan » - 65, rue de Saint-Brieuc	Jean-Marc Roussel	jean-marc.roussel@inrae.fr	Point of contact
Laboratoire LETG, Université Rennes 2, place recteur Henri le Moal	Simon Dufour	simon.dufour@univ-rennes2.fr	Point of contact
UMR DECOD « Dynamique et durabilité des écosystèmes : de la source à l’océan » - 65, rue de Saint-Brieuc	Ivan Bernez	ivan.bernez@institut-agro.fr	Point of contact
UMR DECOD « Dynamique et durabilité des écosystèmes : de la source à l’océan » - 65, rue de Saint-Brieuc	Julie Coudreuse	julie.coudreuse@institut-agro.fr	Point of contact
AESN		aesn@aesn.fr	funder

Maintenance and update frequency: As needed

Maintenance note: Last update : 29/05/2026

Place

Données ouvertes
Dam removal

INSPIRE themes

Selune river
Normandy
France

Thésaurus INRAE

ecological restoration
dam
dynamique de la végétation
vegetation

GEMET

environment
biology
flora (biology)

Use limitation: Usage libre sous réserve des mentions obligatoires sur tout document de diffusion : "Source : UMR DECOD INRAE - Agrocampus Ouest"

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

Access constraints: Other restrictions

Use constraints: License

Other constraints: Pas de restriction d’accès public

Spatial representation type: Vector

Denominator: 25000

Language: fre

Topic category

Environment

Description: Secteur hydrographique "I9" (correspondant à la Sélune de sa source à l'embouchure)

Begin date: 2021-05-19

End date: 2025-07-09

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

Digital transfer options

OnLine resource

Protocol	Linkage	Name
OGC:WMS	https://geosas.fr/geoserver/wms?SERVICE=WMS&REQUEST=GetCapabilities	selune:v_bioc_vegriv_stra_tax_obs_qua_vegriv
WWW:DOWNLOAD-1.0-http--download	https://geosas.fr/geoserver/wfs?service=WFS&version=2.0.0&request=GetFeature&typeName=selune:v_bioc_vegriv_stra_tax_obs_qua_vegriv&outputFormat=SHAPE-ZIP	Download in Shapefile format
WWW:LINK-1.0-http--link	https://programme-selune.com/observatoire-selune/la-vegetation-des-berges	Observatoire Sélune - La végétation des berges
WWW:DOWNLOAD-1.0-http--download	https://geosas.fr/geoserver/wfs?service=WFS&version=2.0.0&request=GetFeature&typeName=selune:v_bioc_vegriv_stra_tax_obs_qua_vegriv&outputFormat=CSV	Download in CSV format
WWW:DOWNLOAD-1.0-http--download	https://geosas.fr/geoserver/wfs?service=WFS&version=2.0.0&request=GetFeature&typeName=selune:v_bioc_vegriv_stra_tax_obs_qua_vegriv&outputFormat=JSON	Télécharger au format JSON
WWW:LINK-1.0-http--link	https://hal.inrae.fr/hal-04839910v1	Rapport d'activité Observatoire des biocénoses aquatiques de la Sélune 2019-2021
WWW:LINK-1.0-http--link	https://hal.inrae.fr/hal-04839973v1	Observatoire des biocénoses aquatiques de la Sélune - rapport d'activités 2022
WWW:LINK-1.0-http--link	https://hal.inrae.fr/hal-04840030v1	Observatoire des biocénoses aquatiques de la Sélune - rapport d’activités 2023
WWW:LINK-1.0-http--link	https://hal.inrae.fr/hal-05167013	Rapport d'activités 2024 de l'Observatoire des biocénoses aquatiques de la Sélune
WWW:LINK-1.0-http--link	https://hal.inrae.fr/hal-05670771v1	Rapport d'activités 2025 de l'Observatoire des biocénoses aquatiques de la Sélune

Hierarchy level: Dataset

Conformance result

Title: INSPIRE Data Specification for the spatial data theme Elevation

Date (Publication): 2026-05-29

Pass: No

Statement: The tracking stations were located using a hiking GPS (planimetric accuracy expected <= 20 m).

i) Sampling monitoring:

The sampling monitoring system is based on measurements distributed at different points in space (longitudinally and laterally). It aims to identify the diversity of flora and vegetation and describe the structure of formations and emerging plant communities within the neo-valley. Implemented annually (sub-annual only for 2021, before dismantling), this monitoring aims to identify and characterize the evolution trajectories of these vegetation over time.

The vegetation sampling protocol is implemented at several stations located along the course of the Sélune and at the mouth of several tributaries located in the right-of-way of the two former reservoirs. The sample of stations is supplemented by a batch of stations positioned outside the right-of-way of the two former reservoirs, downstream and upstream, which constitute so-called "reference" stations.

For each station, a transect is established perpendicular to the channel, from the bank to a reference point located at the level of the former water reservoir (i.e. 60m NGF for Vezins & 28.5m NGF for LRQB). Along this transect, 25m2 (5mx5m) quadrats are positioned according to previously set distance intervals. These quadrats (named Q1 to Q1+n) constitute the elementary unit within which abiotic (slope, texture...) and biotic (composition, structure) parameters are characterized and evaluated. The number of quadrats sampled per station varies depending on the width of the exposed bank (or transect length). It is completed by a reference quadrat, located beyond this maximum value (named Q0).

In the field, once the structure of the station has been established: location of the GPS reference point and definition of the transect, each quadrat is also defined by 4 visual markers. The soil typology, slope, general characterization (water, bare soil, litter) as well as for the 6 vegetation strata is carried out and annotated on a field sheet. Then, the species are sampled before moving on to the next quadrat.

The dataset built from these data acquired in the field is supplemented by reference information retrieved from the dataset "Ponctuel référentiel hydrographique du programme scientifique Sélune" (association of each station with a reference point that allows retrieving the positioning on the catchment area, the reference altitude at the watercourse level and not at the station, the watercourse, as well as distances to the sea and to the source).

For more information on the content of the dataset, refer to the attribute dictionary.