Presence of Marphysa disjuncta (Polychaeta: Eunicidae) in the Mediterranean Sea

An individual belonging to the eunicid polychaete species Marphysa disjuncta Hartman, 1961 was collected on muddy substratum at 100 m deep in Fethiye Bay (Levantine Sea, eastern Mediterranean). This species is new to the Mediterranean fauna. It closely resembles to Marphysa bellii, a native species, but it lacks compound falcigers and has unidentate subacicular hooks. This species was only reported from the eastern and western Pacific Ocean and could have been introduced to the Mediterranean Sea via ballast waters of vessels

First record of Paraprionospio coora Wilson, 1990 (Polychaeta: Spionidae) from the Mediterranean Sea)

The spionid polychaete Paraprionospio pinnata (Ehlers, 1901) has been widely reported from the Mediterranean Sea. We examined some specimens belonging to the genera Paraprionospio that had been collected from the Aegean Sea, Sea of Marmara and the Spanish Mediterranean coast, and identified them as Paraprionospio coora Wilson, 1990, which is new to the Mediterranean fauna. This finding indicates that P. coora has a widespread geographical distribution in Australia, Far East and the Mediterranean, and suggests that the previous records of P. pinnata from the Mediterranean are questionable

New records of alien polychaete species for the coasts of Turkey

This paper reports two alien polychaete species (Phyllodoce longifrons and Exogone africana) new to the faunal inventory of Turkey as well as two species (Ceratonereis mirabilis and Onuphis eremita oculata) new to the entire Aegean Sea. It is the first time the phyllodocid species P. longifrons is being classified as an alien species. The re-descriptions of P. longifrons and E. africana are given, and their alien status and establishment success are discussed

Alien species on the coasts of Turkey

The compilation of data on alien species reported from the Turkish coasts yielded a total of 263 species belonging to 11 systematic groups, of which Mollusca had the highest number of species (85 species), followed by Crustacea (51), fishes (43) and phytobenthos (39). The Black Sea is represented by a total of 20 alien species, the Sea of Marmara by 48 species, the Aegean Sea by 98 species and the Levantine Sea by 202 species. The majority of aliens found in the Black Sea and the Sea of Marmara were transported via shipping, whereas the Levantine coast is extensively subjected to Lessepsian migration. Benthic habitats (soft and hard substrata) comprise 76% of the total alien species and the pelagic environment is inhabited by thirty-nine species. Almost 50% of aliens collected from the Turkish coasts were found only at 0-10 m depth. Eight species occur at depths deeper than 100 m. The impacts of aliens on the benthic and pelagic ecosystems are presented

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

Impacts of invasive alien marine species on ecosystem services and biodiversity: a pan-European review

A good understanding of the mechanisms and magnitude of impact of invasive alien species on ecosystem services and biodiversity is a prerequisite for efficient prioritization of actions for prevention of new invasions or for mitigation measures. In this review, we have identified marine alien species of high-impact on ecosystem services and biodiversity in the European seas, classified the mechanisms of impact, commented on the methods applied for assessing impact and the related inferential strength, and reported gaps in available information. Furthermore, we have proposed an updated inventory of 86 marine species in Europe, representing 12 phyla, with documented high impact on ecosystem services or biodiversity. Food provision was the ecosystem service that was impacted by the highest number of alien species (in terms of both positive and negative impacts). Following food provision, the ecosystem services that were negatively affected by the highest number of species were ocean nourishment, recreation and tourism, and water purification, while the ecosystem services that were more often positively impacted were water purification, cognitive benefits, and climate regulation. In many cases, marine aliens impact keystone/protected species and habitats. Almost 30% of the assessed species affected entire ecosystem processes or wider ecosystem function, more often in a negative way. Fifty of the assessed species have been reported to be ecosystem engineers, fundamentally modifying, creating or defining habitats by altering their physical or chemical properties. Positive impacts of alien species are probably underestimated, as there is a persistent perception bias against alien species. We conclude that the “native good, alien bad” philosophy is a misconception and the role of most of the alien species in marine ecosystems is rather complex. Among the species herein assessed as high-impact species, 15 had only negative and 8 only positive impacts; for the majority (64 species) both negative and positive impacts have been reported, and the overall balance is often unknown. Although there is no doubt that invasive species have modified marine ecosystems, evidence for most of the reported impacts is weak, as it is based on expert judgement or dubious correlations, while only ~10% of the reported impacts were inferred via manipulative or natural experiments. A need for stronger inference is evident, to improve our knowledge base of marine biological invasions and better inform managers.JRC.H.1-Water Resource