Friday 7 November 2014

Rockpooling destination: Unst, Shetland, September 2014

The rocky shore comprises shelving bedrock with crevices and small rock pools.
 Tar lichen occurs in the littoral fringe and extends as patches into the upper shore (supralittoral) with periwinkles. The upper and mid shore are charecterised by barnacles and limpets with the addition of mussels in the mid shore; whilst spiral wrack occurs on the sheltered aspects of the rock and red seaweeds occur across the lower shore.

Habitat classification:
Substrate
LR (Littoral rock)
Habitat
LR.HLR (High energy littoral rock)
FLR (Features of littoral rock)
Biotope complex
LR.HLR. MusB (Mussel and/or barnacle communities)
LR.FLR.Lic (Lichens on supralittoral rock)
LR.FLR.Rkp (Rockpools)
Eph.FLR.Eph (Ephemeral green or red seaweed communities
Biotope
LR.FLR.Lic.Ver (Verrucaria maura on littoral fringe rock)
LR.FLR.Rkp.Cor (Coralline crust dominated shallow eulittoral rockpools)
LR.FLR.Eph.EntPor (Porphyra purpurea and Entomorpha spp. on sand scoured lower eulittoral rock)


Below are images of organisms you may encounter whilst rockpooling in these habitats:
















   The rocky shore comprises sloping bed rock with crevices and rockpools. Tar lichen (Verrucaria maura) and rough periwinkles (Littorina sp) occur in the supralittoral, rockpools, barnacles, limpets and barnacles occur throughout the upper, mid and lower shore. Whilst mussels occur with crevices of the mid shore. Spiral wrack (Fucus spiralis) is confined to the sheltered sides of the rock and red occur throughout the mid and lower shore. Habitat classification: LR.FLR.Lic.Ver (Verrucaria maura on littoral fringe rock), LR.FLR.Rkp.Cor (Coralline crust dominated shallow eulittoral rockpools) and LR.HLR. MusB (Mussel and/or barnacle communities.


  Small periwinkles (Melarhaphe neritoides) and both species of rough periwinkle (Littorina sp) occur with tar lichen (Verrucaria maura) within the littoral fringe. Habitat classification:  LR.FLR.Lic.Ver (Verrucaria maura on littoral fringe rock).

Barnacles and limpets occur across the shore (Eulittoral) with small coralline rockpools scattered throughout. Habitat classification: LR.FLR.Rkp.Cor (Coralline crust dominated shallow eulittoral rockpools) and LR.HLR. MusB (Mussel and/or barnacle communities.

    A small coralline rockpool of the mid shore with a small encrustation of corallinacea crusts, Limpets (Patella sp) and Beadlet anemones (Actinia equina).



Coral weed (Corallina officinalis), Corallinaceae crust, barnacles and epiphytic seaweed within a coralline rockpool

   Limpets (Patella vulgata) and sparse barnacles.

  Limpets (Patella vulgata), barnacles and a red seaweed.

Common blue mussels (Mytilus edulis) occur within crevices amongst barnacles and limpets (Patella sp) of the mid shore. Habitat classification: LR.HLR. MusB (Mussel and/or barnacle communities.

   M. edulis occur within crevices amongst barnacles, limpets (Patella sp) and the red seaweed, Porphya sp.

   Barnacles, M. edulis and periwinkles.

  M. edulis, barnacles and limpets (Patella sp).

1  Further down the shore Barnacles, M. edulis forms clumps overgrown with red seaweed and dog whelks (Nucella lapillus) and periwinkles. 

   Dulse on the lower shore

Dulse on the lower shore

Dulse on the lower shore

    A red seaweed and springtails on the mid shore

  Mastocarpus stellatus, Porphyra sp and Ulva sp on the lower shore

   Fucus spiralis and Ulva sp (previously Entomorpha sp) in a sheltered area of the shore

     F. spiralis in a more sheltered area of the shore

  Cladophora rupestris and F. spiralis

  Ephemeral greens cover the lower shore boulders. Habitat classification: LR.FLR.Eph.EntPor (Porphyra purpurea and Entomorpha spp. on sand scoured lower eulittoral rock).

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