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data collected by non-experienced (MPA) divers were W) and 42% (Cala Rossa E) in 2012, between 99% (Cala
similar to those from experienced (ENEA) divers (Figure 4). Monaci E) and 58% (Cala Rossa E) in 2013, between 98%
Fish abundance evaluation through visual census showed (Cala Monaci E) and 72% (Cala Rossa E) in 2014 (Figure 7).
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no differences (P>0,05) both in the case of pelagic (Figure The mean shoot number ∙ m ² of the meadow ranged Research & development
5) and of necto-benthic fishes (Figure 6). Despite the high between 381 (Cala Rossa E) and 540 (Cala Monaci E) in
variability in counts, abundance of some necto-benthic fishes 2012, between 370 (Cala Rossa E) and 500 (Cala Rossa W)
was overestimated by the non-experienced observers. in 2013, between 337 (Cala Rossa E) and 468 (Cala Rossa
C) in 2014 (Figure 8). Generally, higher values of cover %
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Monitoring activities corresponded to higher shoot number ∙ m ², as recorded
In 6 localities, the visual estimation of P. oceanica canopy at Cala Monaci E, Cala Rossa E and Cala Rossa C.
cover of the meadow ranged between 100% (Cala Monaci On the whole, 32 fish species were censused during the
monitoring activities performed in 2012, 2013, 2014 (Table
1). Most of them (21) were those recorded on the bottom,
11 were found in the water column (see Materials and
Methods).

FIGURE 5 Mean pelagic fish species abundance evaluated
by one experienced (ex) and one non-experienced
(nex) diver in the six localities. Standard deviations FIGURE 7 Mean percentage cover (± S.D.) of the meadow
are indicated by bars estimated in 6 localities in 2012, 2013, 2014

FIGURE 6 Mean necto-benthic fish species abundance evaluated
by one experienced (ex) and one non-experienced
(nex) diver in six localities. Standard deviations FIGURE 8 Mean shoot number∙ m-² (± S.D.) counted in 6 localities
are indicated by bars in 2012, 2013, 2014

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