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Bohuslän

The marine flora of the Koster Archipelagoe


The marine flora and fauna of the Pater Noster skerries

Abstract: The Pater Noster skerries reaches 15 km out into the sea at the frontier between the Kattegat and the Skagerrak in the middle part of the province of Bohuslän. On behalf of The County Administrative Board of Västra Götalands län, a survey of the dominating submarine flora and fauna was carried out during July, 2000, as a part of the implementation of the EU/Natura2000 system.

The Pater Noster area is virtually non-tidal, but is heavily exposed to waves and strong currents, which creates potential for organisms prone to sedimentation to settle and colonize.Species composition and the depth distribution of the macro algae and dominating fauna were recorded at depths between 0-30 m. The Pater Noster area could not be considered as being of special interest with reference to rare macro algae.Species composition did not differ from other comparable geographical areas.There were no abnormal signs of taxa related to eutrophication.The kelp Laminaria hyperborea was common at the W-NW sides of the "archipelagoe"

Faunal species indicative of strong currents and low sedimentation, such as the coralls Caryophyllia smithii and Swiftia rosea, the bryozoans Flustra foliacea and Securiflustra securifrons, hydroids of the genus Nemertia sp., as well as the common Dahlia anemone Urticina felina were found at the W-NW sides of the Pater Noster skerries.

Contact person(s): Jan Karlsson

Grants: County Administrative Board of Västra Götalands län.

Collaboration: Lars-Ove Loo, Dept. of Marine Ecology (TMBL), Göteborg University.


Report (In Swedish only) available in pdf-format:

The marine flora and fauna of the Pater Noster skerries Size 1.6 Mb

 

 

 

  • Pater Noster report

 


The marine flora and fauna of the Tistlarna-Vrångö archipelagoe

Abstract: The Tistlarna-Vrångö area is situated approximately 10-16 km off the coastline in the south-west part the Gothenburg archipelagoe, the northern part of the Kattegat . On behalf of The County Administrative Board of Västra Götalands län, a survey of the dominating submarine flora and fauna was carried out during July, 2000, as a part of the implementation of the EU/Natura2000 system.

The Tistlarna-Vrångö area is virtually non-tidal, with approximately 2/3 of the area being exposed to waves, while the remaining area may be considered as sheltered to semi-sheltered. Species composition and the depth distribution of the macro algae and dominating fauna were recorded at depths between 0-25 m. The Tistlarna-Vrångö area could not be considered as being of special interest with reference to rare macro algae. Species composition did not differ from other comparable geographical areas, with the exceptions of the kelp Laminaria hyperborea and the knobbed wrack (Ascophyllum nodosum), which both were found in low numbers only. There were no abnormal signs of taxa related to eutrophication.

Fauna indicative of strong currents and low sedimentation such as the soft coral Alcyonium digitatum and the common Dahlia anemone Urticina felina, as well as a few colonies of the bryozoan Flustra foliacea were found at the SW-W sides of the surveyed area.

Contact person(s): Jan Karlsson

Grants: County Administrative Board of Västra Götalands län.


Report (In Swedish only) available in pdf-format:

The marine flora and fauna of the Tistlarna-Vrångö archipelagoe Size 2.2 Mb

 

 

 

  • Tistlarna report