The evolution of infrastructure networks such as roads and streets are of utmost importance to understand the evolution of urban systems. However, datasets describing these spatial objects are rare and sparse. The database presented here represents the road network at the french national level described in the historical map of Cassini in the 18th century. The digitalization of this historical map is based on a collaborative platform methodology that we describe in detail. These data can be used for a variety of interdisciplinary studies, covering multiple spatial resolutions and ranging from history, geography, urban economics to the science of network. (2015-01-15)

Macrophytes are a group of aquatic plants. They are at the base of the food chain and can provide a habitat for many other species. The relative abundance of different species is used to calculate an environmental quality index (IBMR). 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 reference stations, are outside the area of influence of the former dams (one downstream, the other upstream). At these stations, aquatic biocenoses (including benthic macroinvertebrates, biofilms, macrophytes, etc.) are monitored. The parameters monitored are specific composition and cover, at 8 stations in the main course, located upstream, downstream and in neolotic areas of macrophyte communities. The monitoring frequency consists of one annual campaign for stations outside reservoirs (S0, S1 and S5) and two annual campaigns (spring/autumn) for neolotic stations (S2, S3.4, S4.1 and S6). The protocol used is the sampling protocol for macrophytes and bryophytes in accordance with standard NF T90-395 (October 2003), which defines the IBMR. Taxa are sampled for laboratory identification. This layer gives the value of the IBMR and EQR (normalized) index at a station for a campaign, as well as information concerning the robustness of this index, the quantities of taxa used to calculate these indices and also information in terms of the proportion of major floristic groups (heterotrophs, algae, bryophytes, pteridophytes, helophytes, phanerogrames, floating vegetation and submerged vegetation).

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.

Macrophytes are a group of aquatic plants. They are at the base of the food chain and can provide a habitat for many other species. The relative abundance of different species is used to calculate an environmental quality index (IBMR). 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 reference stations, are outside the area of influence of the former dams (one downstream, the other upstream). At these stations, aquatic biocenoses (including benthic macroinvertebrates, biofilms, macrophytes, etc.) are monitored. The parameters monitored are specific composition and cover, at 8 stations in the main course, located upstream, downstream and in neolotic areas of macrophyte communities. The monitoring frequency consists of one annual campaign for stations outside reservoirs (S0, S1 and S5) and two annual campaigns (spring/autumn) for neolotic stations (S2, S3.4, S4.1 and S6). The protocol used is the sampling protocol for macrophytes and bryophytes in accordance with standard NF T90-395 (October 2003), which defines the IBMR. Taxa are sampled for laboratory identification. This layer gives Taxon identification is based on version v17 of the TAXREF reference. The dataset is currently under embargo.

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 various 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, the stations are 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. This layer gives the IBD and EQR (normalised) index value for a station during a campaign.

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. 2 sampling campaigns (spring and autumn) for benthic macroinvertebrates (bmi) have been carried out since September 2014. During each campaign, 2 sampling protocols are implemented: - in accordance with standard NF T90-333, which enables the calculation of the IBG-DCE and I2M2 (‘SURBER’) - via artificial substrates immersed for 1 month (‘SUBART’), in order to focus on measuring the ‘effect of dams’. The protocol is described in: Piscart C., Moreteau, J.C., Beisel J.N. (2006). Monitoring changes in freshwater macroinvertebrate communities along a salinity gradient using artificial substrates. Environmental Monitoring and Assessment 116: 529-542. This layer details the benthic macroinvertebrate taxa and their abundance obtained after analysis (according to standard NF T90-388). These data are distributed by campaign and by sector. Taxa presenting all the morphological criteria clearly visible and characteristic allowing the exactitude of their determination and an irreproachable state of conservation are integrated into the reference collection of the Sélune Observatory. This collection can be consulted on request (see contact point). Taxon determination is based on version v17 of the TAXREF reference. The dataset is currently under embargo.

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, in situ measurement of chlorophyll-a concentration via BentoTorch and then collection of the biofilm on these glass slides. The biofilm is conditioned in (1) 99.9% ethanol for determination of IBDs and floristic lists (outsourced service, based on standard NF T90-354) and (2) mineral water for measurement of chlorophyll-a concentration using a spectrometer. Taxon identification is based on version v17 of the TAXREF reference. The dataset is currently under embargo.

Abstract This site provides the global geographical distribution of gorse (Ulex europaeus) in introduced areas. We provide the xls files with all data in the standardized Darwin Core format, the map and the corresponding files. Coordinate points are provided in decimal degrees (latitude, longitude) and correspond to the confirmed existence of Ulex europaeus between 1950 and 2018. The dataset is a compilation of several sources, online databases (including GBIF and iNaturalist), scientific papers, personal communications, and prospecting by the authors (in the field or through online visual searches). The data were verified and duplicates were removed. More details are provided in Christina et al., 2020. The resulting dataset comprises 14,053 occurrences. The geo-located points are classified according to the administrative boundaries of the countries or islands in which they are located, except for Europe. For Europe, refer to the GBIF database. To view the interactive map, go to WMS and click on “add to map” or "visualiser" below. Résumé Distribution géographique de l'ajonc Ulex europaeus à l’échelle mondiale au format Darwin Core. Les points de coordonnées sont en degrés décimaux (latitude, longitude), ils correspondent à l’existence avérée d’un individu d'Ulex europaeus entre 1950 et 2018. Le jeu de données est une compilation de plusieurs sources, banques de données en ligne (dont GBIF, iNaturalist), articles scientifiques, communications personnelles et prospection par les auteurs (sur le terrain ou par recherche visuelle en ligne). Les données collectées ont été nettoyées, vérifiées, et les doublons éliminés. Tous les pays ou régions ayant référencé de l’ajonc sont répertoriés, sauf la zone native (Europe). Le jeu de données obtenu comprend 14053 occurrences. Les points géo-localisés sont classifiés selon les limites administratives des pays ou îles dans lesquels ils sont situés. Pour l'Europe, se reporter à la base GBIF. Afin d'afficher la carte interactive, aller sur WMS et cliquer plus bas sur 'add to map' ou 'visualiser'. Data verification and accuracy Several methods were used: visual checks on geolocated images (for data from citizen science), elimination of outliers (e.g., those located in the sea) or irrelevant data (in museums, centroids of administrative regions or large vector objects, etc.). For the data selected, maximum accuracy was sought by cross-referencing multiple sources of information (literature, observations, personal communications, geolocated images). The accuracy of the geolocations obtained is less than 100 meters for two-thirds of the points and less than 1 km for three-quarters of the points. Vérification et précision des données Plusieurs méthodes ont été utilisées : vérifications visuelles sur images géo-localisées (pour les données issues des sciences citoyennes), élimination des points aberrants (par exemple ceux localisés dans la mer), ou non-pertinents (dans des Muséums, centroïdes de régions administratives ou d’objets vectoriels de grande taille…). Pour les données retenues, la précision maximale a été recherchée en recoupant de multiples informations (littératures, observations, communications personnelle, images géolocalisées). La précision des géolocalisations obtenues est inférieure à 100 mètres dans les deux-tiers des points, inférieur au km pour les trois quarts des points. Christina M., *Limbada F., Atlan A. 2020. Climatic niche shift of an invasive shrub (Ulex europaeus). Journal of Plant Ecology. rtz041, https://doi.org/10.1093/jpe/rtz041 Programme ANR MARIS : Management and risk analysis of an invading plant species (ulex europaeus (L.): how socio-ecological niche with population dynamics modelling under a wide range of climates can help. ANR reference : ANR-14-CE03-0007

Superposition de la délimitation des Bassins Versants de Bretagne avec l'indice de végétation NDVI découpé sur la ville de Rennes. Les Bassins Versants de l'étude CSEB résume la localisation et la délimitation de l'ensemble des bassins versants présent en Bretagne. Cette donnée est disponible en libre service sur GéoBretagne. Le NDVI calculé sur Rennes est basé sur un image Sentinel-2 récupéré sur SentinelHub.