250
M. Cormaci et al.
Table 3. Cystoseira amentacea v. stricta community
Number of transect
Depth in em (xlO)
Per cent total cover (xlO)
Number of species per sample
1
2
:3
3
2
3
10 10 10
25 23 18
Cystoseira amentacea (C. Agardh)
2
5
4
Bory v. stricta Montagne
Corallina eumgata Ellis et Solander
+ + +
Ceramium sec:undatum Lyngbye
+ +
Valonia utricularis (Roth) C. Agardh
2
+ +
Cystoseira compressa
(Esper) Gerloff et Nizamuddin
Ceramium diaphanum (Lightfoot) Roth
+
+
Ceramium circinatum (Kfttzing) J. Agardh
Ceramium ciliatum
+
(Ellis) Ducluzeau v. robustum
O. Agardh) G. Mazoyer
Laurencia glandulifera (Kiitzing) Kfttzing
3 +
Osmundea truncata (Kiitzing) K.W. Nam et Maggs
Callithamnion corymbosum (Smith) Lyngbye
Ceramium flaccidum (Kiltzing) Ardissone
+ + +
Lithophyllum pustulatum (Lamouroux:) Foslie
+ +
Gastroclonium clavatum (Roth) Ardissone
+ 1 +
Callithamnion granulatum
+ + +
(Ducluzeau) C. Agardh·
Crouania attenuata (C. Agardh) J. Agardh
+ +
Ceramium siliquosum
+ +
(Kiitzing) Maggs et Hommersand
Ectocarpus silic:ulosus
+ +
(Dillwyn) Lyngbye v. siliculosus
Gelidium pusillum (Stackhouse) Le Jolls
Osmundea verlaquei G. Furnari
+
+
Hydrolithon boreale (Foslie) Chamberlain
+ +
Sphacelaria cirrosa (Roth) C. Agardh
+ + +
Antithamnion cruciatum (C. Agardh) Niige1i
+
Bryopsis corymbosa J. Agardh
+
Ectocarpus siliculosus
+
(Dillwyn) Lyngbye v. pygmaeus
(Areschough) Gallardo
Stylonema alsidii (Zanardini) Drew
+
Ceramium tenerrimum (Martens) Okamura
+
Dasya baillouviana (Gmelin) Montagne
+ +
Lomentaria ercegovicii Verlaque et al.
+ +
Pneophyllum fragile Kiitzing
Colpomenia sinuosa
(Mertens ex Roth) Derbes et Solier
Number of species per sample not reported
7
6
4
in the table
R rubra and R bornetii are dominant among the
understory species.
From 13 to 20 m depth (Table 5) the vegetation is characterised by a community with
Dictyota dichotoma v. dichotoma, Codium bursa
and Peyssonnelia squamaria; at -20 m
Peyssonnelia bornetii is more frequent. shows
4
5
6 7 8
9 10 11
2 2
10 10
30 14
3 3 3 3 2 2
10 10 10 10 10 10
25 21 18 22 16 23
5 5
+ +
+ +
2 +
1
+
+
2
+ +
+ +
+ +
+ +
+ +
+ +
+
+ +
+ +
+
+
+
+
+
5
7
5
+
+
1
+
+
+
+
+
+
+
+
+
5
3
+
+
+
+
+
+
+
+
+
+
+
+
+
+
6
5
+
+
+
+
+
+
+
+
+
+
+
4
3
5
2
5
3
1
+ + +
+
1
1
+
+ 1
+ + +
+
+
+ +
+ +
+ + +
+ +
+
+
+
+ + +
+
+ +
+
+
+
+
+
+ +
6 12 4
12 13 14 15 16
3 :3
3
3 3
10 10 10 10 10
28 22 22 25 25
3
+
+
2
+
2
+
+
+
+
+
+
+
+
+
+
+
+
+
+
1
8
5
+
+
+
2
+
+
+
+
+
+
+
+
7
5
+ +
3
+ +
+
+ 3
3
2
+
+
+ +
+ +
+ +
1
+ +
+
+
+ +
+
+
+
1
+
+ +
7 7
4
1
+
+
+
+
+
1
1
+
+
1
+
+
1
+
8
high per cent cover values and in some stations
replaces R squamaria. At the following two stations. Scoglietti (Caprara) at -14 m and Punta
Diamante (St Domino) at -18 m, Codium vermilara is present too. Lithophyllum stictaeforme is
very frequent and abundant among the understory species.