Proceedings of the Second Mediterranean Symposium on Marine
Proceedings of the Second Mediterranean Symposium on Marine
Proceedings of the Second Mediterranean Symposium on Marine
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871 accepted taxa (Table 1). However, it should be noted that most species <str<strong>on</strong>g>of</str<strong>on</strong>g> <str<strong>on</strong>g>the</str<strong>on</strong>g><br />
Laurencia complex and <str<strong>on</strong>g>of</str<strong>on</strong>g> n<strong>on</strong>geniculate Coralline algae were <strong>on</strong>ly tentatively included<br />
in <str<strong>on</strong>g>the</str<strong>on</strong>g> accepted taxa. In fact, because <str<strong>on</strong>g>the</str<strong>on</strong>g> tax<strong>on</strong>omy <str<strong>on</strong>g>of</str<strong>on</strong>g> such groups has recently<br />
underg<strong>on</strong>e substantial reassessments, in absence <str<strong>on</strong>g>of</str<strong>on</strong>g> <str<strong>on</strong>g>the</str<strong>on</strong>g> study <str<strong>on</strong>g>of</str<strong>on</strong>g> herbarium specimens,<br />
<str<strong>on</strong>g>the</str<strong>on</strong>g> occurrence <str<strong>on</strong>g>of</str<strong>on</strong>g> most <str<strong>on</strong>g>of</str<strong>on</strong>g> such species should be c<strong>on</strong>firmed.<br />
Table 1. The macroalgal italian flora: compositi<strong>on</strong> <str<strong>on</strong>g>of</str<strong>on</strong>g> <str<strong>on</strong>g>the</str<strong>on</strong>g> whole flora, <str<strong>on</strong>g>of</str<strong>on</strong>g> floras <str<strong>on</strong>g>of</str<strong>on</strong>g> each FAO sector<br />
(sector 3: Tyrrhenian Sea and adjacent basins; sector 4: Adriatic Sea; sector 5: I<strong>on</strong>ian Sea), <str<strong>on</strong>g>of</str<strong>on</strong>g> comm<strong>on</strong><br />
species to all sectors as well as <str<strong>on</strong>g>of</str<strong>on</strong>g> sole species <str<strong>on</strong>g>of</str<strong>on</strong>g> each sector.<br />
Italy<br />
sector 3<br />
sector 4<br />
Rhodophyta 510 470 340 444 314 44 4 32<br />
58.7% 61.2% 58.9% 63.2%<br />
Phaeophyta 205 169 124 148 93 26 21 15<br />
23.6% 21.9% 21.5% 21.1%<br />
Chlorophyta 154 130 113 110 84 20 14 5<br />
17.7% 16.9% 19.6% 15.7%<br />
Total 869 769 577 702 491 90 39 52<br />
88.5% 66.4% 80.8% 56.5% 10.3% 4,5% 6.0%<br />
Since <str<strong>on</strong>g>the</str<strong>on</strong>g> Italian coasts (Fig. 1) fall within <str<strong>on</strong>g>the</str<strong>on</strong>g> FAO fishering sectors 3 (Tyrrhenian Sea and<br />
adjacent basins), 4 (Adriatic Sea) and 5 (I<strong>on</strong>ian Sea), <str<strong>on</strong>g>the</str<strong>on</strong>g> floristic c<strong>on</strong>sistency <str<strong>on</strong>g>of</str<strong>on</strong>g> each<br />
sector was calculated.<br />
The flora <str<strong>on</strong>g>of</str<strong>on</strong>g> <str<strong>on</strong>g>the</str<strong>on</strong>g> sector 3 is <str<strong>on</strong>g>the</str<strong>on</strong>g> richest with 769 taxa (470 Rhodophyta, 169<br />
Phaeophyta and 130 Chlorophyta), followed by that <str<strong>on</strong>g>of</str<strong>on</strong>g> <str<strong>on</strong>g>the</str<strong>on</strong>g> sector 5 with 702 taxa<br />
(444 Rhodophyta, 148 Phaeophyta and 110 Chlorophyta) and by that <str<strong>on</strong>g>of</str<strong>on</strong>g> <str<strong>on</strong>g>the</str<strong>on</strong>g> sector<br />
4 that resulted <str<strong>on</strong>g>the</str<strong>on</strong>g> poorest with 577 taxa (340 Rhodophyta, 124 Phaeophyta and<br />
113 Chlorophyta). The three sectors share 491 taxa (equal to 56.5%), while 90<br />
taxa (10.3%) are present <strong>on</strong>ly in <str<strong>on</strong>g>the</str<strong>on</strong>g> sector 3, 39 taxa (4.5%) in <str<strong>on</strong>g>the</str<strong>on</strong>g> sector 4 and<br />
52 taxa (6.0%) in <str<strong>on</strong>g>the</str<strong>on</strong>g> sector 5 (Table 1). In order to understand <str<strong>on</strong>g>the</str<strong>on</strong>g><br />
phytogeographic characteristics <str<strong>on</strong>g>of</str<strong>on</strong>g> <str<strong>on</strong>g>the</str<strong>on</strong>g> Italian flora, a specific investigati<strong>on</strong> <str<strong>on</strong>g>of</str<strong>on</strong>g> <str<strong>on</strong>g>the</str<strong>on</strong>g><br />
areals <str<strong>on</strong>g>of</str<strong>on</strong>g> every species has been c<strong>on</strong>ducted. Following that study, each species was<br />
assigned to a distributi<strong>on</strong>-group named according to Cormaci et al. (1982).<br />
Chorological spectra (Table 2 and Fig. 2) <str<strong>on</strong>g>of</str<strong>on</strong>g> <str<strong>on</strong>g>the</str<strong>on</strong>g> Italian flora and <str<strong>on</strong>g>of</str<strong>on</strong>g> floras <str<strong>on</strong>g>of</str<strong>on</strong>g> sectors<br />
3 and 5 are characterised by a dominance <str<strong>on</strong>g>of</str<strong>on</strong>g> <str<strong>on</strong>g>the</str<strong>on</strong>g> Atlantic element, followed by <str<strong>on</strong>g>the</str<strong>on</strong>g><br />
<str<strong>on</strong>g>Mediterranean</str<strong>on</strong>g>, Cosmopolitan, Indo-Pacific, Circumtropical and Circumboreal; <strong>on</strong>ly<br />
that <str<strong>on</strong>g>of</str<strong>on</strong>g> <str<strong>on</strong>g>the</str<strong>on</strong>g> sector 4 shows a different sequence <str<strong>on</strong>g>of</str<strong>on</strong>g> distributi<strong>on</strong> groups with <str<strong>on</strong>g>the</str<strong>on</strong>g><br />
dominance <str<strong>on</strong>g>of</str<strong>on</strong>g> <str<strong>on</strong>g>the</str<strong>on</strong>g> Atlantic element, followed by <str<strong>on</strong>g>the</str<strong>on</strong>g> Cosmopolitan, <str<strong>on</strong>g>Mediterranean</str<strong>on</strong>g>,<br />
Circumtropical, Indo-Pacific and Circumboreal.<br />
sector 5<br />
comm<strong>on</strong><br />
species<br />
sole species<br />
<str<strong>on</strong>g>of</str<strong>on</strong>g> sector 3<br />
sole species<br />
<str<strong>on</strong>g>of</str<strong>on</strong>g> sector 4<br />
sole species<br />
<str<strong>on</strong>g>of</str<strong>on</strong>g> sector 5<br />
ACTES DU DEUXIEME SYMPOSIUM MEDITERRANEEN SUR LA VEGETATION MARINE (ATHENES, 12-13 DECEMBRE 2003)<br />
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