Posidonia Monitoring Network for the PACA Region (RSP PACA)
Monitoring data for the state of upper and lower limitations of the posidonia seagrass meadows in the PACA region, by buoyage (24 monitoring points, then 33 since 1994) from 1984 to 2003.
In the PACA region, the posidonia meadow is a powerful integrator of water quality: being widespread and sensitive to disturbances related to human activity, its presence is an indicator of water quality and life. This is also true of its regression, characterised by dead clumps of seagrass over long periods (years). Posidonia seagrass is a source of food, a habitat, a shelter, a spawning ground and a nursery for many species of flora and fauna.
Simple
- Title
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Posidonia Monitoring Network for the PACA Region (RSP PACA)
- Date (Creation)
- 1984-01-01T00:00:00
- Citation identifier
- FR-DCSMM-PDS-RSP-PACA
- Presentation form
- Digital profile
- Abstract
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Monitoring data for the state of upper and lower limitations of the posidonia seagrass meadows in the PACA region, by buoyage (24 monitoring points, then 33 since 1994) from 1984 to 2003.
In the PACA region, the posidonia meadow is a powerful integrator of water quality: being widespread and sensitive to disturbances related to human activity, its presence is an indicator of water quality and life. This is also true of its regression, characterised by dead clumps of seagrass over long periods (years). Posidonia seagrass is a source of food, a habitat, a shelter, a spawning ground and a nursery for many species of flora and fauna.
- Credit
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Data producers : GIS Posidonie
- Status
- Completed
- Point of contact
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Organisation name Individual name Electronic mail address Role GIS Posidonie
LE DIREACH Laurence
Local service desk
- Maintenance and update frequency
- Annually
- Maintenance note
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Network duration : temporary network
- Theme
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Posidonia meadow
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Aerial photography
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Monitoring
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Upper limit buoyage
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Lower limit
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Monitoring tool
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GEMET - INSPIRE themes, version 1.0
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Environmental monitoring facilities
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Sous-regions marines
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Western Mediterranean
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DCSMM : Type d'espace concerné
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Pas d'espace particulier concerné
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DCSMM : Descripteurs
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D1: Coastal benthic habitats
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DCSMM : Méthodes de recueil des données
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Observation par point
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Télémétrie
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Interprétation de cartographies
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Observation directe
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Thèmes Sextant
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/Biological Environment/Key Habitats/Seagrass
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- Access constraints
- Other restrictions
- Other legal constraints
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Free access for: scientists, member of the GIS Posidonie Scientific Committee. For others: subject to backers’ authorisation (Marseille city council).
Means of distribution: currently the data is not distributed. Consultation limited to the Marseille-Luminy laboratory, in metadata form, that is to say annual reports, pdf distributed from time to time following backers’ approval.
- Use limitation
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Unknown conditions
- Spatial representation type
- Vector
- Denominator
- 5000
- Language
- Français
- Character set
- UTF8
- Topic category
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- Oceans
- Supplemental Information
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Project leader :
GIS Posidonie 1984-2003
Prime contractor :
Bouches du Rhône (CELCOP) Var (CAPVAR)
Alpes Maritimes (CIPALM)
Backers :
PACA Regional Council Maritime Services and the departmental equipment directorate
The Water Agency
- Reference system identifier
- EPSG / WGS 84 (EPSG:4326) / 7.9
- Topology level
- Geometry only
- Geometric object type
- Complex
- Geometric object count
- 0
- Hierarchy level
- Dataset
Conformance result
- Title
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Inspire specifications
- Date (Creation)
- 2012-01-16
- Explanation
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Non assessed
- Pass
- Statement
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April 1984: Proposal of RSP and buoyage implantation
2003 : Final year of GIS Posidonie
2004 : Tender won by B.E EOL and final year of RSP
Number of observation or measurement points : 9 density measurements + 30 coverage measurements)x12 sites/year x 19 years
Further Information :
An analysis of nuisance types and risk factors encountered was conducted for each of the 33 RSP sites
- Description
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Data type :
Posidonia oceanica seagrass meadows
Précision sur le type de donnée :
3 observation scales: overall dynamics (macrostructure), density, buoyage monitoring, rhizomes (microstructure), biometry, lepidochronology (plant)
Measured or observed parameters :
Limit type:
(progressive, clear, erosive or regressive (classification from Meinesz & Laurent, 1978).)
Limitation of position measurement (depth), map of the buoyage (direction, distance, depth), dead clump distance downstream, meadow/buoy photo (3 photos: left, right and above). Description of the meadow structure (plain, hill, uneven), erosion (clumps falling, channels), and nature of the sea bed. Neighbouring species (protected, of national interest, non-native, indicative, etc.).
Density:
(Number of leaf clusters per m². Varies depending on depth and environmental conditions)
Measurements taken in a 20x20cm square, with 3 measurements per buoy (left, right, centre), random but directed sampling. Classification in accordance with Giraud (1977) and Pergent et al. (1995).
Coverage :
(percentage of substrate coverage by posidonia leaves, compared to non covered areas. Varies according to season, depth, and the health of the seagrass meadow).
Vertical coverage measurements, 3m deep with a transparant plastic sheet of 30 x 30 cm, divided into 9 squares as described in the method by Gravez et al. (1995).
Counting the number of squares occupied by the seagrass. Three measurements per buoy, which amounts to more than 30 measurements per marker. In the absence of measurement, a visual estimation of coverage is mage, with 5% tread (but also an observer effect).
Retreat :
(Distance separating the rhizomes from the sediment (measured according the protocol described by Boudouresque et al., 1980))
Retreat is evidence of sediment deficit. Suggested scale for evaluation (<5 cm low, 5-15 cm average, >15 cm high, Charbonnel et al., 2000).
Plagiotropic :
(Proportionof plagiotropic rhizomes.)
Indicator of the seagrass meadow’s good health, tends to increase. The position of the majority of rhizomes (plagiotropic/orthotropic) is noted either side of the marker.
Phenology :
Study of the morphological characteristics of the plant. Marked seasonal variations.
Giraud protocol (1977). Measurements of the number and type of leaves (adult, intermediate, juvenile), length and breadth of leaves, lead area index (LAI) and A coefficient (grazing).
Measurements taken from 15 clusters.
Lepidochronology :
Study of cyclic variations in scale thickness (Pergent, 1987).
Measurement of the number of leaves formed per year. (number of scales present between 2 minima of thickness) and rhizome growth speed per year (length of rhizome stems between 2 minima of thickness). Samples taken from 15 clusters, dissection, weight after drying.
- Description
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Sampling method : Spatial
Metadata
- File identifier
- 195b3196-8fbf-4617-9983-a0963dcfec7a
- Metadata language
- Français
- Other language
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Language Character encoding English
- Character set
- UTF8
- Hierarchy level
- Series
- Date stamp
- 2018-01-18T13:12:55
- Metadata standard name
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ISO 19115:2003/19139 - SEXTANT
- Metadata standard version
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1.0
- Metadata author
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Organisation name Individual name Electronic mail address Role Sextant
Local service desk