Important Plant Areas for algae - Natural History Museum

43 Enlli and Pen SH1324 and
Llŷn, Caernarvon around
44 Oyster Bank,
Tremadog Bay,
Caernarvon
46 The Sarnau,
Caernarvon
48 Porth Cwyfan,
Caernarvon
49 Rhosneigr Reef,
Anglesey
50 Wear Point,
Caernarvon
SCOTLAND
SH3530
Various (as
stated by
CCW)
SAC;
NNR
MNR;
SAC
A, B Very high Bedrock, cliffs, caves and gullies on wave and tide exposed shores.
Bedrock cliffs, boulders, caves and gullies in the subtidal with
generally clear water all result in a large infralittoral zone. The site
was proposed because of Schmitzia hiscockiana and the diversity of
intertidal and subtidal algal assemblages; the number of species is
very high (207) in a relatively small area.
A, C The Oyster Bank at Pwllheli is a sheltered area of mud and sand
bottom with stabilised pebbles and shells including small cobbles and
pebbles in a muddy matrix. The site lies at a depth of 8 m within
Tremadog Bay which is in the Pen Llŷn Sarnau marine SAC. It is
the only known site in the UK for Anotrichium barbatum.
Dermocorynus montagnei is a truly rare species confined to gravel.
SAC A?, B, D? High? The Sarnau is comprised of three unusual shallow subtidal reefs
(Sarn Badrig, Sarn-y-Bwch and Sarn Cynfelyn) which extend southwest
into Cardigan Bay. The largest of the reefs, Sarn Badrig,
extends about 24 km offshore. The Sarnau are thought to be the
remains of glacial moraines formed during the last glaciation, and are
considered to be unique sublittoral reef features in the British Isles
(Coastal Geomorphology Partnership) and are composed entirely of
boulders, cobbles and pebbles with various grades of sediments
mixed in. The communities of the Sarnau are typically composed of
ephemeral seaweed species that grow rapidly during the summer or
are very robust species that resist scour by sand mobilised by winter
storms.
SH335684 SSSI B?, D Two small bays and an island (with causeway) on the west coast of
Anglesey. The shore is made up of complex rugged platforms which
support a wide range of habitats including rockpools, overhangs and
boulders. The platforms are covered with a dense canopy of fucoids,
kelps and red algae. The site was nominated because of its diverse
algal community and for Cystoseira.
SH3172
SM94119429
/ SM939044
SSSI;
AONB
B A series of reefs and pools on the west coast of Anglesey at
Rhosneigr. It was designated as an SSSI in 1980 for its rich algal
assemblage. This site under threat from non-native species e.g.,
Sargassum muticum.
Schmitzia hiscockiana
Anotrichium barbatum
Dermocorynus montagnei
Polysiphonia furcellata
Osmunda truncata
Atractophora hypnoides
Ceramium cimbricum
Compsothamnion gracillimum
Gloiosiphonia capillaris
Polysiphonia devoniensis
Rhodymenia delicatula
Osmundea truncata
SAC A? Low shore muddy shingle spit. Chondracanthus teedei
20