Database release:

For Special Protection Areas (SPA),
Proposed Sites for Community Importance (pSCI),
Sites of Community Importance (SCI) and
for Special Areas of Conservation (SAC)



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1.1 Type


1.2 Site code


1.3 Site name

Izra-völgy és az Arlói-tó

1.4 First Compilation date


1.5 Update date


1.6 Respondent:

Name/Organisation:Bkk National Park Directorate

1.7 Site indication and designation / classification dates

Date site proposed as SCI:2004-05
Date site confirmed as SCI: No data
Date site designated as SAC:2010-02
National legal reference of SAC designation:275/2004. (X. 8.) Kormnyrendelet


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2.1 Site-centre location [decimal degrees]:


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

2.6 Biogeographical Region(s)

Pannonian (0.00 %) Pannonian (0.00 %) Pannonian (100.00 %)
Pannonian (100.00 %) Pannonian (100.00 %) Pannonian (100.00 %)
Pannonian (0.00 %) Pannonian (100.00 %) Pannonian (0.00 %)
Pannonian (0.00 %) Pannonian (0.00 %) Pannonian (0.00 %)


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3.1 Habitat types present on the site and assessment for them

Annex I Habitat types Site assessment
Code PF NP Cover [ha] Cave [number] Data quality A|B|C|D A|B|C
      RepresentativityRelative SurfaceConservationGlobal
40A0  info      13.49  0.00       
6210  info      269.82  0.00 
6240  info      13.49  0.00       
6430  info      13.49  0.00       
7230  info      13.49  0.00 
9130  info      120.07  0.00 
91E0  info      26.98  0.00 
91G0  info      67.46  0.00 
91H0  info      29.68  0.00 
91I0  info      13.49  0.00       
91M0  info      404.74  0.00 
  • 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
G Code Scientific Name S NP T Size Unit Cat. D.qual. A|B|C|D A|B|C
      MinMax  Pop.Con.Iso.Glo.
I1088Cerambyx cerdo    10  10         
I4045Coenagrion ornatum    100  100   
I1086Cucujus cinnaberinus    800  1500         
P1902Cypripedium calceolus    45  45         
I4032Dioszeghyana schmidtii    1000  1000   
I1052Hypodryas maturna    100  100   
I1083Lucanus cervus    100  100         
I1060Lycaena dispar    100  100         
P2093Pulsatilla grandis    70  70         
I1014Vertigo angustior               
I1016Vertigo moulinsiana               
  • 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)


Population in the site


Group CODE Scientific Name S NP Size Unit Cat. Species Annex Other categories
     MinMax C|R|V|PIVVABCD
Apatura ilia                   
Aricia eumedon                   
Boloria selene                   
Brenthis ino                   
Cephalanthera damasonium                   
Cephalanthera longifolia                   
Cupido osiris                   
Dactylorhiza incarnata ssp. pulchella                   
Dactylorhiza majalis                   
Eriophorum latifolium                   
Orchis militaris                   
Orchis purpurea                   
Orchis tridentata                   
Platanthera bifolia                   
Polygala major                   
Polyommatus admetus                   
Prunella grandiflora                   
Pulsatilla nigricans                   
  • 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


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4.1 General site character

Habitat class % Cover

Total Habitat Cover


Other Site Characteristics

The Arl Lake is derived from a slump forming a rare natural phenomenon.

4.2 Quality and importance

Kiemelt fontossg cl a kvetkezo fajok / lohelyek kedvezo termszetvdelmi helyzetnek fenntartsa / helyrelltsa: meszes alapkozetu fltermszetes szraz gyepek s cserjsedett vltozataik (Festuco-Brometalia) (*fontos orchidea-lelohelyek) (6210) szubmontn s montn bkksk (Asperulo-Fagetum) (9130) enyves ger (Alnus glutinosa) s magas koris (Fraxinus excelsior) alkotta ligeterdok (Alno-Padion, Alnion incanae, Salicion albae) (91E0) pannon gyertynos-tlgyesek Quercus petraeval s Carpinus betulusszal (*91G0) pannon cseres-tlgyesek (91M0) pannon molyhos tlgyesek Quercus pubescensszel (91H0) The site has colline semi-dry and dry clearings, low colline oak forests on calcic base rocks, valley bottom seeping habitats and flushes.

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
RankThreats and pressures [code]Pollution (optional) [code]inside/outside [i|o|b]
Positive Impacts
RankActivities, management [code]Pollution (optional) [code]inside/outside [i|o|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

4.5 Documentation

Selected bibliography: Bnkuti K. - Vojtk A. (1995): Adatok a Sonchus palustris L. elterjedshez. - Folia Hist.-nat. Mus. Matr. 20: 49-50. Benedek O. - Zay A. (1987): Adatok a Heves-megyei szak-Tarnavidk flrjhoz. - Fol.Hist.-nat. Mus. Matr. 12: 19-20. Budai J. (1914): Adatok Borsodmegye flrjhoz. - Magyar Botanikai Lapok 13: 312-326. Kovcs M. (1962): bersicht der Bachrhricte (Glycerio-Sparganion) Ungarns. - Acta Bot. Acad. Sci. Hung. 8: 107-143. Kovcs M. (1963): A Filipendulo-Geranietum palustris hazai llomnyainak ttekintse. - Botanikai Kzlemnyek 50: 157-165. Suba J. (1963): Adatok a Tarna-vidk flrjhoz. - Acta Acad. Paed. Agriensis 9: 253-261. Suba J. (1969): A Tarna-vidk flrjnak kritikai elemzse. - Acta Acad. Paed. Agriensis Nov. Ser. 7: 379-413. Zay A. (1984): Florisztikai megfigyelsek az szak-Tarna vidken. - TDK dolgozat, Ho Si Minh Tanrkpzo Foiskola, Eger. Sulyok J. - Schmotzer A. 1999: Data to the flora of Heves-Borsod Hills (Tarna-vidk) and the northern foreground of the Bkk Mts. - Kitaibelia 4(2): 367-380. The lepidopterous populations of the area became known as a result of the Butterfly Monitoring Sub-program of the National Biodiversity Monitoring Program.


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5.1 Designation types at national and regional level:

Code Cover [%]

5.3 Site designation (optional)

Cca. 1% of the site is an "ex lege" protected area, but the rest is not protected.


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6.2 Management Plan(s):

An actual management plan does exist:

No, but in preparation

6.3 Conservation measures (optional)

ltalnos clkituzsek: A Natura 2000 terlet termszetvdelmi clkituzse az azon tallhat, a kijells alapjul szolgl fajok s lohelytpusok kedvezo termszetvdelmi helyzetnek megorzse, fenntartsa, helyrelltsa, valamint a Natura 2000 terletek lehatrolsnak alapjul szolgl termszeti llapot s a kedvezo termszetvdelmi llapottal sszhangban lvo gazdlkods feltteleinek biztostsa. SPECIFIKUS CLOK 1.FO CLKITUZSEK A terleten tallhat nagy kiterjedsu sztyeppesedo flszraz gyepek (6210), valamint a hozzjuk ktheto nvny- s llatvilg kedvezo termszetvdelmi helyzetnek fenntartsa / elrse, kiemelten a flszraz gyepek (6210) cserjsedsnek, akcosodsnak visszaszortsval mechanikai, szksg esetn vegyszeres kezelsekkel; A terleten tallhat termszetszeru erdok (bkksk (9130), gerligetek (91E0), gyertynos-tlgyesek /91G0), pannon molyhos- /91H0/ s cseres-tlgyesek /91M0/) kedvezo termszetvdelmi helyzetnek fenntartsa / elrse, idos llomnyrszek, faegyedek, valamint holt faanyag mennyisgnek nvelsvel, az idos, elegyes erdok nyjtotta mikroklma biztostsa. A terjeszkedo idegenhonos fafajok visszaszortsa; Vzfolysok termszetes medermorfolgijnak s vzjrsnak biztostsa, az de, tpanyaggazdag magaskrsok a sksgtl a magas hegyvidkig (6430) s az gerligetek (91E0) fennmaradsa rdekben. 2.TOVBBI CLOK A terleten tallhat, a flszraz- s sztyepprt lohely tpusokba nem sorolhat msodlagos gyepek kedvezo termszetvdelmi helyzetnek (cl a jello gyep lohely tpusokk / 6210, 6240/ alakuls) elrse, elsosorban legeltetssel/kaszlssal, illetve a cserjseds, akcosods visszaszortsval mechanikai, szksg esetn vegyszeres kezelsekkel; Az invzis fafajjal (akc) fertoztt erdollomnyok termszetessgnek fejlesztse; A forrs-s sklpok kedvezotlen szukcesszijnak megakadlyozsa, A magasssrtek beerdoslsnek s bendasodsnak megakadlyozsa cserjeirtssal s kaszlssal; Mocsrrtek extenzv hasznlata, kaszlssal trtno hasznostsa, elsosorban az invzis lgyszrak (pl. kanadai aranyvesszo /Solidago canadensis/ visszaszortsa rdekben.



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