depends on the type of maritime traffic or not, considering three different marinas with
different use destinations, including an incomplete marina that does not host boats yet.
Materials and methods
Fouling samples were collected in September 2020 in three marinas within the San
Remo coastal stretch (Ligurian Sea, Italy): Porto Sole (a marina with international
recreational boat traffic, including megayachts), Porto Vecchio (a marina for local
fishing boats) and Ospedaletti (an incomplete and unused marina). Porto Sole and Porto
Vecchio are closer and embedded in the same port area, while the locality of Ospedaletti
is less than 10 km away. In each site, five samples of fouling communities were
collected by scraping the vertical surface of the concrete docks with the use of a handheld rigid net (Ferrario et al., 2017). The samples were preserved in ethanol 70% and
then analyzed in the laboratory for the taxonomic identification of sessile and mobile
macrobenthic fauna. A semi-quantitative approach was followed to assess the
abundance of each species per sample (see methods in Ferrario et al., 2017) and
statistical analyses were performed with the software PRIMER 6 (with
PERMANOVA+ add-on package).
Results
A total of 85 species (including 2 NIS) were found in the Ospedaletti marina, while 45
species (8 NIS) and 47 (9 NIS) were observed in Porto Vecchio and Porto Sole,
respectively. In all the investigated sites, Crustacea was the most abundant group in
terms of number of species, followed by Mollusca in Ospedaletti and Polychaeta in the
other two localities (Fig. 1). Interestingly, the port for local fishing boats, Porto
Vecchio, displayed the highest number of bryozoans, but other taxonomic groups such
as Porifera, Cnidaria, Sipuncula and Echinodermata were missing, (Fig. 1).
Considering the abundance of species, the one-way PERMANOVA test highlighted a
significant difference among sites (Pseudo-F: 5.4174; P(perm): 0.0001).
In addition, the dissimilarity among the marinas were measured with a one-way
SIMPER test: between Ospedaletti and Porto Vecchio was equal to 80.32%; between
Ospedaletti and Porto Sole was 85.30%; while between Porto Vecchio and Porto Sole it
was 67.46%.
2nd Mediterranean Symposium on the Non-Indigenous Species (Genoa, Italy, 22-23 September 2022)
39
different use destinations, including an incomplete marina that does not host boats yet.
Materials and methods
Fouling samples were collected in September 2020 in three marinas within the San
Remo coastal stretch (Ligurian Sea, Italy): Porto Sole (a marina with international
recreational boat traffic, including megayachts), Porto Vecchio (a marina for local
fishing boats) and Ospedaletti (an incomplete and unused marina). Porto Sole and Porto
Vecchio are closer and embedded in the same port area, while the locality of Ospedaletti
is less than 10 km away. In each site, five samples of fouling communities were
collected by scraping the vertical surface of the concrete docks with the use of a handheld rigid net (Ferrario et al., 2017). The samples were preserved in ethanol 70% and
then analyzed in the laboratory for the taxonomic identification of sessile and mobile
macrobenthic fauna. A semi-quantitative approach was followed to assess the
abundance of each species per sample (see methods in Ferrario et al., 2017) and
statistical analyses were performed with the software PRIMER 6 (with
PERMANOVA+ add-on package).
Results
A total of 85 species (including 2 NIS) were found in the Ospedaletti marina, while 45
species (8 NIS) and 47 (9 NIS) were observed in Porto Vecchio and Porto Sole,
respectively. In all the investigated sites, Crustacea was the most abundant group in
terms of number of species, followed by Mollusca in Ospedaletti and Polychaeta in the
other two localities (Fig. 1). Interestingly, the port for local fishing boats, Porto
Vecchio, displayed the highest number of bryozoans, but other taxonomic groups such
as Porifera, Cnidaria, Sipuncula and Echinodermata were missing, (Fig. 1).
Considering the abundance of species, the one-way PERMANOVA test highlighted a
significant difference among sites (Pseudo-F: 5.4174; P(perm): 0.0001).
In addition, the dissimilarity among the marinas were measured with a one-way
SIMPER test: between Ospedaletti and Porto Vecchio was equal to 80.32%; between
Ospedaletti and Porto Sole was 85.30%; while between Porto Vecchio and Porto Sole it
was 67.46%.
2nd Mediterranean Symposium on the Non-Indigenous Species (Genoa, Italy, 22-23 September 2022)
39