Database release:
SDF
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)

TABLE OF CONTENTS

1. SITE IDENTIFICATION

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1.1 Type

B

1.2 Site code

SE0110263

1.3 Site name

Norsviken

1.4 First Compilation date

2001-01

1.5 Update date

2020-12

1.6 Respondent:

Name/Organisation:Länsstyrelsen i Stockholms län
Address:               
Email:stockholm@lansstyrelsen.se

1.7 Site indication and designation / classification dates

Date site proposed as SCI:2001-06
Date site confirmed as SCI:2005-01
Date site designated as SAC:2011-03
National legal reference of SAC designation:Governmental act M2010/4648/Nm

2. SITE LOCATION

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2.1 Site-centre location [decimal degrees]:

Longitude:18.878384
Latitude:59.884396

2.2 Area [ha]

24.3800

2.3 Marine area [%]

85.6300

2.4 Sitelength [km] (optional):


No information provided

2.5 Administrative region code and name


No information provided

2.6 Biogeographical Region(s)

Boreal (100.00 %)

3. ECOLOGICAL INFORMATION

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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
1650  info      20.9  0.00 
6430  info      2.4  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


No species are reported for the site

3.3 Other important species of flora and fauna (optional)


No information provided

4. SITE DESCRIPTION

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4.1 General site character

Habitat class % Cover
N10100.00

Total Habitat Cover

100

Other Site Characteristics

This site is an inner archipelago area. It consists of a narrow bay and, at the inner tip of the bay, a wet tall herb site along a small rivulet. Morphological features of the bay such as the large catchment area (200 times as big as the inlet) and the shallow and narrow threshold probably give the bay a low salinity and short turnover time, as well as higher temperature than larger waterbodies outside the threshold. There is little human modification of the shore-line and a limited number of holiday cottages in the vicinity of the inlet. This indicates rather natural environmental conditions. There are, however, no site specific data on water chemistry, with no relevant data from surrounding sea. The only data useful for assessment of the water quality in the site comes from the stream which leads most of the surface run off to the inlet and an upstream lake. Seemingly there is good retention of nutrients as the lake has moderate ecological status for phytoplankton and bad status for nutrients while the stream has good status for phytobentose.

4.2 Quality and importance

Little is known about flora and fauna in the marine part of the site. Relatively low degree of human impact and good morphological conditions for reproduction of fresh water fish species gives the site high potential conservation importance. In the costal brackish-water environment fresh water fish-species are important ecological factors. Most stocks are limited by availability of spawning grounds and suitable environments for growth of fry, rather than food availability. In Norsviken there are theoretically very good conditions for growth of fry, but there are no field data supporting this. In the stream Norsjöbäcken however, several exploratory fisheries have shown extensive spawning migration from the site. This includes pike, perch, many species of Cyprinids, including the national red list species Vimba vimba, river lamprey and occasionally trout. Fry of many of these species probably uses the site for growth.

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]
HA04.03i
Positive Impacts
RankActivities, management [code]Pollution (optional) [code]inside/outside [i|o|b]
HA04.02i

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)


No information provided

4.5 Documentation (optional)


No information provided

5. SITE PROTECTION STATUS

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5.1 Designation types at national and regional level (optional):

Code Cover [%]
SE00100.00

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

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6.1 Body(ies) responsible for the site management:

Organisation:Länsstyrelsen i Stockholms län
Address:
Email:stockholm@lansstyrelsen.se

6.2 Management Plan(s):

An actual management plan does exist:

X
Yes Name: Norsviken
Link: http://skyddadnatur.naturvardsverket.se/

No, but in preparation
No

6.3 Conservation measures (optional)


No information provided

 

7. MAP OF THE SITE

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INSPIRE ID:SE.SWEPA.SE0110263
Map delivered as PDF in electronic format (optional)
Yes
X
No

SITE DISPLAY