NATURA 2000 - STANDARD DATA FORM
For Special Protection Areas (SPA),
Proposed Sites for Community Importance (pSCI),
Sites of Community Importance (SCI) and
for Special Areas of Conservation (SAC)
SITE | FR2200353 |
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SITENAME | Réseau de coteaux calcaires du Ponthieu méridional |
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TABLE OF CONTENTS
1. SITE IDENTIFICATION
Back to top1.1 Type
1.2 Site code
1.3 Site name
Réseau de coteaux calcaires du Ponthieu méridional |
1.4 First Compilation date
1.5 Update date
1.6 Respondent:
Name/Organisation: | Ministère de la Transition écologique - DGALN/DEB/SDET/ET5 |
Address: |
|
Email: | en3.en.deb.dgaln@developpement-durable.gouv.fr |
1.7 Site indication and designation / classification dates
Date site proposed as SCI: | 1999-03 |
Date site confirmed as SCI: | 2004-12 |
Date site designated as SAC: | 2010-12 |
National legal reference of SAC designation: | http://www.legifrance.gouv.fr/jo_pdf.do?cidTexte=JORFTEXT000023386569 |
2. SITE LOCATION
Back to top2.1 Site-centre location [decimal degrees]:
Longitude: | 2.022220 |
Latitude: | 50.046940 |
2.2 Area [ha]
2.3 Marine area [%]
2.4 Sitelength [km] (optional):
No information provided
2.5 Administrative region code and name
NUTS level 2 code
|
Region Name
|
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FR22 | Picardie |
2.6 Biogeographical Region(s)
3. ECOLOGICAL INFORMATION
Back to top3.1 Habitat types present on the site and assessment for them
Annex I Habitat types
|
Site assessment
|
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Code
|
PF
|
NP
|
Cover [ha]
|
Cave [number]
|
Data quality
|
A|B|C|D
|
A|B|C
|
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| | | | | | Representativity | Relative Surface | Conservation | Global |
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5130
|
|
| 10.02
| 0.00
| G
| A
| C
| A
| A
|
6210
|
|
| 7.11
| 0.00
| G
| A
| C
| B
| A
|
- PF: for the habitat types that can have a non-priority as well as a priority form (6210, 7130, 9430) enter "X" in the column PF to indicate the priority form.
- NP: in case that a habitat type no longer exists in the site enter: x (optional)
- Cover: decimal values can be entered
- Caves: for habitat types 8310, 8330 (caves) enter the number of caves if estimated surface is not available.
- Data quality: G = 'Good' (e.g. based on surveys); M = 'Moderate' (e.g. based on partial data with some extrapolation); P = 'Poor' (e.g. rough estimation)
3.2 Species referred to in Article 4 of Directive 2009/147/EC and listed in Annex II of Directive 92/43/EEC and site evaluation for them
Species
|
Population in the site
|
Site assessment
|
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G
|
Code
|
Scientific Name
|
S
|
NP
|
T
|
Size
|
Unit
|
Cat.
|
D.qual.
|
A|B|C|D
|
A|B|C
|
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| | | | | | Min | Max | | | | Pop. | Con. | Iso. | Glo. |
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I | 6199 | Euplagia quadripunctaria |
|
| p
|
|
| i
| P
| DD
| C
| B
| C
| B
|
- Group: A = Amphibians, B = Birds, F = Fish, I = Invertebrates, M = Mammals, P = Plants, R = Reptiles
- S: in case that the data on species are sensitive and therefore have to be blocked for any public access enter: yes
- NP: in case that a species is no longer present in the site enter: x (optional)
- Type: p = permanent, r = reproducing, c = concentration, w = wintering (for plant and non-migratory species use permanent)
- Unit: i = individuals, p = pairs or other units according to the Standard list of population units and codes in accordance with Article 12 and 17 reporting (see reference portal)
- Abundance categories (Cat.): C = common, R = rare, V = very rare, P = present - to fill if data are deficient (DD) or in addition to population size information
- Data quality: G = 'Good' (e.g. based on surveys); M = 'Moderate' (e.g. based on partial data with some extrapolation); P = 'Poor' (e.g. rough estimation); VP = 'Very poor' (use this category only, if not even a rough estimation of the population size can be made, in this case the fields for population size can remain empty, but the field "Abundance categories" has to be filled in)
3.3 Other important species of flora and fauna (optional)
- Group: A = Amphibians, B = Birds, F = Fish, Fu = Fungi, I = Invertebrates, L = Lichens, M = Mammals, P = Plants, R = Reptiles
- CODE: for Birds, Annex IV and V species the code as provided in the reference portal should be used in addition to the scientific name
- S: in case that the data on species are sensitive and therefore have to be blocked for any public access enter: yes
- NP: in case that a species is no longer present in the site enter: x (optional)
- Unit: i = individuals, p = pairs or other units according to the standard list of population units and codes in accordance with Article 12 and 17 reporting, (see reference portal)
- Cat.: Abundance categories: C = common, R = rare, V = very rare, P = present
- Motivation categories: IV, V: Annex Species (Habitats Directive), A: National Red List data; B: Endemics; C: International Conventions; D: other reasons
4. SITE DESCRIPTION
Back to top4.1 General site character
Habitat class
|
% Cover
|
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N09 | 30.00 |
N12 | 8.00 |
N14 | 10.00 |
N15 | 20.00 |
N16 | 30.00 |
N23 | 2.00 |
Total Habitat Cover | 100 |
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Other Site Characteristics
Site éclaté de deux noyaux de vallées sèches crayeuses du Ponthieu méridional : "vallée de Bouchon et de Villers" et "vallée de Nielle à Cocquerel", rassemblant deux séries calcicoles sèches, l'une thermo-continentale en limite d'aire nord-occidentale et centrée sur la pelouse de l'Avenulo pratensis-Festucetum lemanii subass. seselietosum montani (pelouse du Mesobromion, endémique de l'îlot continental chaud dit du "sud-amiénois") et mêlant des affinités continentales et méditerranéennes ici en limite d'influence ; l'autre série présente un léger caractère submontagnard particulier au val de Somme et la pelouse est un type endémique picardo-normand rare et localisé (vallée de la Somme, de la Haute-Oise, du Thérain,...). Le site de la vallée de la Nielle est avant tout remarquable par son immense et originale junipéraie impénétrable, exemple probablement unique d'un seuil de blocage dynamique lié au genévrier.
L'état de conservation du site est surtout entaché par la traversée de l'A16 qui coupe en deux le coteau de Bouchon/Villers. Suite à l'abandon des systèmes traditionnels d'exploitation pastorale et à l'effondrement des pressions biotiques liées au lapin, la densification et l'embroussaillement sont en phase d'accélération, ce qui suggère une intervention conservatoire rapide et la mise en place d'un programme de gestion pastorale. La junipéraie de la vallée de la Nielle devrait faire l'objet d'un suivi dynamique régulier afin de traiter les éventuels surpassements du seuil de blocage actuel par éradiction sélective des arbustes incriminés (noyaux ligneux évolutifs vers un fourré calcicole à base d'angiospermes, puis un boisement thermo-xérocalcicole). |
4.2 Quality and importance
Les deux vallées constituent un ensemble représentatif et exemplaire des potentialités de pelouses calcaires du plateau picard central : à ce titre, on insistera sur le réservoir faunistique spécifique au Genévrier (présent en populations importantes sur le site) et les paysages "monolithiques" particuliers et spectaculaires des coteaux à Genévriers. Les secteurs de pelouses et les jachères situées à proximité accueillent quelques espèces à fort enjeu de conservation en Picardie dont Stenobothrus stigmaticus et Cupido minimus pour la faune, et Adonis aestivalis, plante messicole. |
4.3 Threats, pressures and activities with impacts on the site
The most important impacts and activities with high effect on the site
Negative Impacts |
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Rank | Threats and pressures [code] | Pollution (optional) [code] | inside/outside [i|o|b] |
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H | A02.01 | | b |
H | A04.03 | | i |
H | A07 | | o |
M | A08 | | b |
H | D01.02 | | i |
H | D01.06 | | i |
M | H06.01 | | i |
M | I01 | | i |
M | K02.01 | | b |
M | K03.03 | | b |
Positive Impacts |
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Rank | Activities, management [code] | Pollution (optional) [code] | inside/outside [i|o|b] |
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H | A04.02 | | i |
H | A06.01 | | b |
Rank: H = high, M = medium, L = low
Pollution: N = Nitrogen input, P = Phosphor/Phosphate input, A = Acid input/acidification,
T = toxic inorganic chemicals, O = toxic organic chemicals, X = Mixed pollutions
i = inside, o = outside, b = both
4.4 Ownership (optional)
Type | [%] |
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Public | National/Federal | 0 |
State/Province | 0 |
Local/Municipal | 0 |
Any Public | 0 |
Joint or Co-Ownership | 0 |
Private | 0 |
Unknown | 0 |
sum | 100 |
4.5 Documentation (optional)
No information provided
5. SITE PROTECTION STATUS
Back to top5.1 Designation types at national and regional level (optional):
Code
|
Cover [%]
|
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FR00 | 100.00 |
5.2 Relation of the described site with other sites (optional):
No information provided
5.3 Site designation (optional)
No information provided
6. SITE MANAGEMENT
Back to top6.1 Body(ies) responsible for the site management:
Organisation: | Conservatoire d'espaces naturels de Picardie |
Address: | |
Email: | |
6.2 Management Plan(s):
An actual management plan does exist:
6.3 Conservation measures (optional)
Des mesures de gestion (pâturage, déboisement, dédensification de junipéraie…) sont mises en place par le CEN Picardie sur le larris de Villers à Bouchon dans le cadre du plan de gestion du site. |
7. MAP OF THE SITE
Back to top
No information provided
SITE DISPLAY