Page 387 - Alderney Regional Environmental Assessment of Renewable Energy: Environmental Report

Alderney Regional Environmental Assessment of Renewable Energy:
Environmental Report
Site Area Habitat Community Types Features of Interest Main Biotopes
2c Les Boufresses Sloping rock
surfaces (3-15m)
Kelp forest of Laminaria
hyperborea with an
understorey of sponges and
red seaweeds
7 species of sponge and 41
seaweeds. Amongst the
seaweeds of note was the
presence of one plant of
Schmitzia
neapolitana on a pebble and
an unidentified small
Cryptonemiales species
IR.HIR.KFaR.LhypR.Loch
Mixed Laminaria hyperborea
and Laminaria ochroleuca
forest on exposed infralittoral
rock
IR.MIR.KR.LhypTX.Pk
Laminaria hyperborea park
and foliose red seaweeds on
tide-swept lower infralittoral
mixed substrata
Flatter surfaces
with boulders and
pebbles (15-18m)
Kelp park
3c Longis Bay Eelgrass bed Eelgrass is present right up to
the rocky edges of Raz Island
and extends south in line with
the southern rocky
promontory to a depth of 11m
A few epiphytic seaweeds
with only a filamentous
brown, vindeterminate,
species recorded. A limited
range of small animals,
including 4 anemones, of
which Peachia cylindrica is
relatively uncommon.
In the rocky areas 25 species
of seaweeds were recorded,
including two kelps,
Laminaria hyperborea and L.
ochroleuca, and the dominant
foliose red seaweeds were
Chordaria flagelliformis,
Brogniartella byssoides,
Ahnfeltia plicata, Caliophyllis
laciniata and
Rhodothamniella floridula. Of
note was the presence of
Gracilaria bursa-pastoris, a
nationally scarce species.
IR.LIR Low energy infralittoral
rock
IR.LIR.K.LhypLoch Mixed
Laminaria hyperborea and
Laminaria ochroleuca forest
on moderately exposed or
sheltered infralittoral rock
SS.SMp.SSgr.Zmar Zostera
marina/angustifolia beds on
lower shore or infralittoral
clean or muddy sand
SS.SSa.IMuSa.AreISa
Arenicola marina in
infralittoral fine sand or
muddy sand
4c
and
5c
Queslingue and
Frying Pan Bay
Rock wall Dense kelp forest containing
both Laminaria hyperborean
and L. ochroleuca. In the
sublittoral fringe there was a
dense covering of foliose red
seaweeds.
45 species of seaweeds were
recorded from the face of
Queslingue alone and there
was a good range of animal
species on the submerged
rocks to the south. The
boulder bed is an unusual
feature in Alderney and was
covered exclusively in the
southern golden kelp,
Laminaria ochroleuca. The
eelgrass bed would be a
priority habitat in the UK and
the crumpled duster sponge,
Axinella damicornis, which is
nationally scarce in the UK,
was also present.
LR.HLR.FR. Robust fucoid
and/or red seaweed
communities
IR.LIR.K.LhypLoch Mixed
Laminaria hyperborea and
Laminaria ochroleuca forest
on moderately exposed or
sheltered infralittoral rock
IR.MIR.KR.Lhyp.Ft Laminaria
hyperborea forest and foliose
red seaweeds on moderately
exposed upper infralittoral
rock
IR.MIR.KR.LhypT Laminaria
hyperborea park and foliose
red seaweeds on tide-swept
lower infralittoral mixed
substrata
SS.SMp.SSgr.Zmar Zostera
marina/angustifolia beds on
lower shore or infralittoral
clean or muddy sand
Submerged rocky
outcrops
The tops and sides were
covered in kelps with the
vertical and overhanging
surfaces contained a greater
range of sessile animals,
including 13 species of
sponge, as well as soft
corals, cup- corals, jewel and
white striped anemones, a
single pink sea fan,
bryozoans, sea cucumbers
and sea squirts.
Sandy seabed Tide-swept patchy eelgrass
bed, with common
filamentous brown seaweeds
on the eelgrass.
Small boulders Kelp forest of Laminaria
ochroleuca with an
understorey of foliose red and
brown seaweeds
6c Rousset, below
Hanging Rock
Steep outer face Dominated by a mixed kelp
forest of Laminaria
hyperborea and L.
ochroleuca with an
understorey of red foliose
seaweeds, sponges and sea
squirts
47 species of seaweeds in
this habitat most of which
were foliose reds. The
majority of the animal life was
on the vertical wall of the rock
and included 16 species of
sponges, as well as a range
IR.HIR.KFaR.LhypR.Loch
Mixed Laminaria hyperborea
and Laminaria ochroleuca
forest on exposed infralittoral
rock
IR.HIR.KFaR.LhypRVt
R/4001/7 B.5 R.2129