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 | FR5300058 |
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SITENAME | Vallée de l'Arz |
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TABLE OF CONTENTS
1. SITE IDENTIFICATION
Back to top1.1 Type
1.2 Site code
1.3 Site name
1.4 First Compilation date
1.5 Update date
1.6 Respondent:
Name/Organisation: | Ministère de l'écologie, du développement durable et de l'énergie - DGALN/DEB/SDEN/Bureau Natura 2000 |
Address: |
La Défense Cedex
92055
|
Email: | en3.en.deb.dgaln@developpement-durable.gouv.fr |
1.7 Site indication and designation / classification dates
Date site proposed as SCI: | 1998-12 |
Date site confirmed as SCI: | 2004-12 |
Date site designated as SAC: | 2007-05 |
National legal reference of SAC designation: | http://www.legifrance.gouv.fr/jo_pdf.do?cidTexte=JORFTEXT000000430233 |
2. SITE LOCATION
Back to top2.1 Site-centre location [decimal degrees]:
Longitude: | -2.345830 |
Latitude: | 47.709440 |
2.2 Area [ha]
2.3 Marine area [%]
2.4 Sitelength [km]:
2.5 Administrative region code and name
NUTS level 2 code
|
Region Name
|
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FR52 | Bretagne |
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
|
---|
| | | | | | Representativity | Relative Surface | Conservation | Global |
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3110
|
|
| 0.12
| 0.00
| G
| D
|
|
|
|
3150
|
|
| 0.24
| 0.00
| G
| D
|
|
|
|
3260
|
|
| 0.46
| 0.00
| G
| B
| C
| B
| B
|
4030
|
|
| 55.39
| 0.00
| G
| A
| C
| B
| B
|
6230
|
X
|
| 2.36
| 0.00
| G
| D
|
|
|
|
6410
|
|
| 2.95
| 0.00
| G
| D
|
|
|
|
6430
|
|
| 6.49
| 0.00
| G
| D
|
|
|
|
8230
|
|
| 3.26
| 0.00
| G
| D
|
|
|
|
9130
|
|
| 13.14
| 0.00
| G
| D
|
|
|
|
- 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
- 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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N06 | 4.00 |
N08 | 12.00 |
N09 | 2.00 |
N10 | 47.00 |
N12 | 10.00 |
N16 | 25.00 |
Total Habitat Cover | 100 |
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Other Site Characteristics
Crêtes schisteuses portant un ensemble de landes, landes boisées et affleurements rocheux dominant par le Sud une portion de la rivière l'Arz sur environ dix kilomètres.
Les dérangements hivernaux, en particulier, ainsi que des modifications importantes de la topographie (nombre, structure et agencement des galeries, fissures etc) et/ou des conditions atmosphériques (humidité, stabilité de la température, circulation d'air, pénétration de la lumière), sont de nature à compromettre la richesse et la diversité du peuplement en Chiroptères.
La préservation de l'habitat rivière et des espèces inféodées dépend de la capacité à préserver la qualité des eaux en provenance du bassin-versant. |
4.2 Quality and importance
Site remarquable par la présence de landes sèches et de groupements pionniers sur affleurements schisteux, dominant une rivière avec végétation à renoncules riche en espèces d'intérêt communautaire. A noter notamment la diversité du peuplement odonatologique (Oxygastra curtisii, Coenagrion mercuriale: annexe II; Onychogomphus uncatus: liste rouge nationale), la reproduction avérée de la Lamproie marine et de la Lamproie de Planer, ainsi que la présence régulière de la Loutre d'Europe, espèces étroitement dépendante d'une eau limpide et bien oxygénée.
La zone comporte par ailleurs 13 des 17 espèces de Chiroptères présentes en Bretagne, dont les six espèces figurant en annexe II de la Directive. Le caractère exceptionnel d'une telle diversité, notamment en période d'hivernage (11 espèces), est lié aux nombreuses opportunités de gîte ainsi qu'à la variété des conditions hygrométriques offertes par d'anciennes ardoisières (La Grée du Pont de l'Eglise, commune de Pluherlin). |
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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Positive Impacts |
---|
Rank | Activities, management [code] | Pollution (optional) [code] | inside/outside [i|o|b] |
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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 | [%] |
---|
Public | National/Federal | 0 |
State/Province | 0 |
Local/Municipal | 0 |
Any Public | 0 |
Joint or Co-Ownership | 0 |
Private | 0 |
Unknown | 0 |
sum | 0 |
5. SITE PROTECTION STATUS
Back to top5.1 Designation types at national and regional level:
5.2 Relation of the described site with other sites:
Designated at national or regional level:
Type code
|
Site name
|
Type
|
Cover [%]
|
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FR13 | SITE DES GREES DE LANVAUX | + | 30.00 |
6. SITE MANAGEMENT
Back to top6.1 Body(ies) responsible for the site management:
Organisation: | |
Address: | |
Email: | |
Organisation: | Grand Bassin de l'Oust |
Address: | |
Email: | |
6.2 Management Plan(s):
An actual management plan does exist:
|
Yes
| |
| No, but in preparation |
X | No |
7. MAP OF THE SITE
Back to top
No data
SITE DISPLAY