On the occurrence of Uronema marinum Womersley (Chaetophorales, Chlorophyta) in the north-western lagoons of the Adriatic Sea, Mediterranean Sea (Italy)

We study the occurrence of the alien macroalga Uronema marinum in the lagoon of Venice, in the lagoons and ponds of the Po Delta and in Pialassa della Baiona in Emilia-Romagna. It was in summer 2012 that U. marinum was identified for the first time, even though it has been present at least since 2008. This species, originally described from South Australia and Western Australia and probably imported with the Manila clam Tapes philippinarum, is prevalently associated with thalli of another introduced species, Agardhiella subulata, and the invasive Gracilaria vermiculophylla, which also have a Pacific origin and have recently colonized the same lagoon areas.  Uronema marinum is currently widespread in the whole lagoon surfaces, but is particularly abundant in stagnant waters, rich in nutrients, where Gracilariaceae and Solieriaceae prevail on Ulvaceae

New macroalgae and rare species in the fishing ponds of the Venice Lagoon and ecological assessment.

Macrophyte assemblages were studied in the whole Venice lagoon, including some close fishing ponds, in order to assess the ecological status of this transitional system. During sampling some new or rare species were recorded highlighting the highest ecological status of areas close to tidal expansion and protected from anthropic impacts

New macroalgae and rare species in the fishing ponds of the Venice Lagoon and ecological assessment.

Macrophyte assemblages were studied in the whole Venice lagoon, including some close fishing ponds, in order to assess the ecological status of this transitional system. During sampling some new or rare species were recorded highlighting the highest ecological status of areas close to tidal expansion and protected from anthropic impacts

Cambio della flora e della vegetazione acquatica in gradienti ecologici dalle Bocche di porto ad alcune valli da pesca della laguna veneta.

Cambio della flora e della vegetazione acquatica in gradienti ecologici dalle bocche di porto ad alcune valli da pesca della laguna venet

Errata to the Review Article (Medit. Mar. Sci. 11/2, 2010, 381-493): "Alien species in the Mediterranean Sea by 2010. A contribution to the application of European Union’s Marine Strategy Framework Directive (MSFD). Part I. Spatial distribution"

The state-of-art on alien species in the Mediterranean Sea is presented, making distinctions among the four subregions defined in the EU Marine Strategy Framework Directive: (i) the Western Mediterranean Sea (WMED); (ii) the Central Mediterranean Sea (CMED); (iii) the Adriatic Sea (ADRIA); and (iv) the Eastern Mediterranean Sea (EMED). The updated checklist (December 2010) of marine alien species within each subregion, along with their acclimatization status and origin, is provided. A total of 955 alien species is known in the Mediterranean, the vast majority of them having being introduced in the EMED (718), less in the WMED (328) and CMED (267) and least in the Adriatic (171). Of these, 535 species (56%) are established in at least one area.Despite the collective effort of experts who attempted in this work, the number of introduced species remains probably underestimated. Excluding microalgae, for which knowledge is still insufficient, aliens have increased the total species richness of the Mediterranean Sea by 5.9%. This figure should not be directly read as an indication of higher biodiversity, as spreading of so many aliens within the basin is possibly causing biotic homogenization. Thermophilic species, i.e. Indo-Pacific, Indian Ocean, Red Sea, Tropical Atlantic, Tropical Pacific, and circum(sub)tropical, account for 88.4% of the introduced species in the EMED, 72.8% in the CMED, 59.3% in the WMED and 56.1% in the Adriatic. Cold water species, i.e. circumboreal, N Atlantic, and N Pacific, make up a small percentage of the introduced species, ranging between 4.2% and 21.6% and being more numerous in the Adriatic and less so in the EMED.Species that are classified as invasive or potentially invasive are 134 in the whole of the Mediterranean: 108 are present in the EMED, 76 in the CMED, 53 in the Adriatic and 64 in the WMED. The WMED hosts most invasive macrophytes, whereas the EMED has the lion’s share in polychaetes, crustaceans, molluscs and fish

On the occurrence of Uronema marinum (Chaetophorales, Chlorophyta) in the north- western lagoons of the northern Adriatic Sea, Mediterranean Sea (Italy)

We report on the morphology and reproductive features of the green alien macroalgal species Uronema marinum Womersley, a small species of Australian origin, in the north-western Adriatic lagoons in the Mediterranean Sea. It was in summer 2012 that U. marinum was identified for the first time in the lagoon of Venice, in the lagoons and ponds of the Po Delta and in Pialassa della Baiona in Emilia-Romagna. Although Uronema filaments have already been observed from some years, until now they were not noticed because of their small size and similarity with young stages of other filamentous green algae such as Ulothrix implexa (Kützing) Kützing. They differ in determinate growth, curved morphology, basal holdfast, the elongated shape of the cells, a larger diameter towards the apex and their reproductive stages. In the European Atlantic Coasts, from France to Norway, another species is reported: Uronema curvatum, now Okellya curvata (Printz) Leliaert & Rueness (Leliaert et al., 2009), that has a similar shape, but lacks pyrenoids. That species, observed throughout the year, is known from shallow subtidal coasts of the south-western Australia, Micronesia and Hawaii and was probably imported in the lagoons of the Adriatic Sea with the seed of the Manila clam Tapes philippinarum (Adams & Reeve) introduced for economic purposes. Its presence was also correlated to some water column and surface sediment parameters and the presence of the most frequent macroalgae which colonize these environments including some NIS (48 sites sampled both in late spring and autumn). Uronema marinum showed a very high correlation (p <0.001) with Gracilaria vermiculophylla (Ohmi) Papenfuss and significant correlations (p <0.05) with Agardhiella subulata (C.Agardh) Kraft et Wynne, Gracilariopsis longissima (S.G. Gmelin) M. Steentoft, L.M. Irvine & W.F. Farnham and the concentration of reactive phosphorus. Both G. vermiculophylla and A. subulata come from the Pacific Ocean (Zenetos et al., 2010). Uronema marinum, has the same origins and may have been introduced attached on one or both those species. Gracilaria vermiculophylla and A. subulata were also significantly correlated with each other (p <0.001). Uronema marinum is currently widespread in the whole lagoon surfaces, but it is particularly abundant in stagnant and confined areas rich in nutrients where Gracilariaceae and Solieriaceae prevail on Ulvaceae due to the high water turbidity

On the occurrence of Uronema marinum (Chaetophorales, Chlorophyta) in the north- western lagoons of the northern Adriatic Sea, Mediterranean Sea (Italy)

We report on the morphology and reproductive features of the green alien macroalgal species Uronema marinum Womersley, a small species of Australian origin, in the north-western Adriatic lagoons in the Mediterranean Sea. It was in summer 2012 that U. marinum was identified for the first time in the lagoon of Venice, in the lagoons and ponds of the Po Delta and in Pialassa della Baiona in Emilia-Romagna. Although Uronema filaments have already been observed from some years, until now they were not noticed because of their small size and similarity with young stages of other filamentous green algae such as Ulothrix implexa (Kützing) Kützing. They differ in determinate growth, curved morphology, basal holdfast, the elongated shape of the cells, a larger diameter towards the apex and their reproductive stages. In the European Atlantic Coasts, from France to Norway, another species is reported: Uronema curvatum, now Okellya curvata (Printz) Leliaert & Rueness (Leliaert et al., 2009), that has a similar shape, but lacks pyrenoids. That species, observed throughout the year, is known from shallow subtidal coasts of the south-western Australia, Micronesia and Hawaii and was probably imported in the lagoons of the Adriatic Sea with the seed of the Manila clam Tapes philippinarum (Adams & Reeve) introduced for economic purposes. Its presence was also correlated to some water column and surface sediment parameters and the presence of the most frequent macroalgae which colonize these environments including some NIS (48 sites sampled both in late spring and autumn). Uronema marinum showed a very high correlation (p <0.001) with Gracilaria vermiculophylla (Ohmi) Papenfuss and significant correlations (p <0.05) with Agardhiella subulata (C.Agardh) Kraft et Wynne, Gracilariopsis longissima (S.G. Gmelin) M. Steentoft, L.M. Irvine & W.F. Farnham and the concentration of reactive phosphorus. Both G. vermiculophylla and A. subulata come from the Pacific Ocean (Zenetos et al., 2010). Uronema marinum, has the same origins and may have been introduced attached on one or both those species. Gracilaria vermiculophylla and A. subulata were also significantly correlated with each other (p <0.001). Uronema marinum is currently widespread in the whole lagoon surfaces, but it is particularly abundant in stagnant and confined areas rich in nutrients where Gracilariaceae and Solieriaceae prevail on Ulvaceae due to the high water turbidity

On the occurrence of Uronema marinum (Chaetophorales, Chlorophyta) in the north- western lagoons of the northern Adriatic Sea, Mediterranean Sea (Italy)

We report on the morphology and reproductive features of the green alien macroalgal species Uronema marinum Womersley, a small species of Australian origin, in the north-western Adriatic lagoons in the Mediterranean Sea. It was in summer 2012 that U. marinum was identified for the first time in the lagoon of Venice, in the lagoons and ponds of the Po Delta and in Pialassa della Baiona in Emilia-Romagna. Although Uronema filaments have already been observed from some years, until now they were not noticed because of their small size and similarity with young stages of other filamentous green algae such as Ulothrix implexa (Kützing) Kützing. They differ in determinate growth, curved morphology, basal holdfast, the elongated shape of the cells, a larger diameter towards the apex and their reproductive stages. In the European Atlantic Coasts, from France to Norway, another species is reported: Uronema curvatum, now Okellya curvata (Printz) Leliaert & Rueness (Leliaert et al., 2009), that has a similar shape, but lacks pyrenoids. That species, observed throughout the year, is known from shallow subtidal coasts of the south-western Australia, Micronesia and Hawaii and was probably imported in the lagoons of the Adriatic Sea with the seed of the Manila clam Tapes philippinarum (Adams & Reeve) introduced for economic purposes. Its presence was also correlated to some water column and surface sediment parameters and the presence of the most frequent macroalgae which colonize these environments including some NIS (48 sites sampled both in late spring and autumn). Uronema marinum showed a very high correlation (p <0.001) with Gracilaria vermiculophylla (Ohmi) Papenfuss and significant correlations (p <0.05) with Agardhiella subulata (C.Agardh) Kraft et Wynne, Gracilariopsis longissima (S.G. Gmelin) M. Steentoft, L.M. Irvine & W.F. Farnham and the concentration of reactive phosphorus. Both G. vermiculophylla and A. subulata come from the Pacific Ocean (Zenetos et al., 2010). Uronema marinum, has the same origins and may have been introduced attached on one or both those species. Gracilaria vermiculophylla and A. subulata were also significantly correlated with each other (p <0.001). Uronema marinum is currently widespread in the whole lagoon surfaces, but it is particularly abundant in stagnant and confined areas rich in nutrients where Gracilariaceae and Solieriaceae prevail on Ulvaceae due to the high water turbidity

Adeguamento al “Piano d’uso sostenibile delle aree in concessione per venericoltura. Attrezzo per la raccolta molluschi”

Rapporto final