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The crab Percnon gibbesi and the mollusc Aplysia dactylomela are recorded for the first time from the Taranto Gulf (Italy, Ionian Sea). Both alien species have been widely reported in the Mediterranean and have established populations in Greece and Sicily. The presence of a few specimens induces us to think that only lately these two species expand...
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Context 1
... observations and photographs by SCUBA photographers convince us that A. dactylomela is locally common along the eastern Sicilian shores from Messina to Syracuse. The present specimen (~15 cm long, Figure 3), was found in daytime near Punta Pizzo (Figure 3), under a small rock, covered by dense algal film with the presence of Caulerpa racemosa, at 50 cm water depth. The provenience of the Mediterranean populations is still unclear because it occurs in the red Sea and the Atlantic ocean. ...
Context 2
... observations and photographs by SCUBA photographers convince us that A. dactylomela is locally common along the eastern Sicilian shores from Messina to Syracuse. The present specimen (~15 cm long, Figure 3), was found in daytime near Punta Pizzo (Figure 3), under a small rock, covered by dense algal film with the presence of Caulerpa racemosa, at 50 cm water depth. The provenience of the Mediterranean populations is still unclear because it occurs in the red Sea and the Atlantic ocean. ...
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Citations
... In questa sede saranno considerate solo le specie rinvenute entro il piano circalitorale. Altri lavori utilizzati nella compilazione della check-list sono: Verduin (1985), Mastrototaro et al. (2003), Albano & Trono (2008), , Crocetta & Colamonaco (2008) e Pusateri et al. (2012. La checklist aggiornata presente in questo lavoro raggruppa tutte queste segnalazioni integrandole con quelle provenienti dalle ulteriori ricerche degli Autori effettuate dal 2002 al 2012 (83 nuove segnalazioni per la zona in esame), e con i dati presenti in Trono (2006) emendati dagli errori. ...
... pers.; 24: Collezione Macrì; 25: Panetta (1970); 26: Portalatina (2008); 27: ; 28: Pusateri et al. (2012); 29: Cecalupo & Robba (2010); 30: Roberto Gioffrè & Nicola Ranaldo, com. pers.; 31: Verduin (1985); 32: Bouchet &Waren (1980); 33: Crocetta & Colamonaco (2008) Tab. 1: Updated checklist of molluscs from the Ionian Salento. ...
Introduzione Scopo principale di questa breve nota è evidenziare e correggere alcuni errori presenti in Trono (2006), dovuti essenzialmente al difficile reperimento di fonti biblio-grafiche datate, spesso su riviste non più esistenti, ai problemi nomenclaturali e tassonomici delle specie su queste citate, a volte mai risolti, e infine alla gestione di una checklist che conta quasi 800 records. Questa nota si prefigge inoltre di segnalare nuove spe-cie rinvenute dagli Autori dal 2002 ad oggi nell'area io-nica salentina, aggiungendo i dati riportati in Panetta (1970) e in altri lavori non consultati precedentemente o pubblicati successivamente al 2006.
... It has also been recorded from Sardinia, the Tyrrhenian Sea, Sicily and Malta (Pipitone et al., 2001;Mori & Vacchi, 2002;Sciberras & Schembri, 2007a). Recently, it has been found in Greek waters (Cannicci et al., 2008;Katsanevakis et al., 2010), Turkey (Yokes & Galil, 2006), Libya (Elkrwe et al., 2008), the Gulf of Taranto (Ionian Sea, Italy, Crocetta & Colamonaco, 2010), Murcia (SE Spain, Félix-Hackradt et al., 2010) and Egypt (Azzurro et al., 2011), and more recently still in other sites around the Mediterranean sea such as Albania, Algeria, Cyprus, Israel and Lebanon (Katsanevakis et al., 2011, and references therein). In addition to the dynamics of spread, however, it is crucial to know its habitat and other environmental requirements, as well as the correlation of its abundance with autochthonous, potentially competing species, in order to understand and forecast the potentiality of this species to become invasive in a given location. ...
The distribution of the allochthonous crab Percnon gibbesi and its relationships with other benthic invertebrate species was assessed inside the marine reserve of Cabo de Palos—Islas Hormigas (Mediterranean sea, Spain) and neighbouring non-protected sites. Although a significant spatial variability was detected at finer spatial scale, there was no influence of protection measures or insularity on the abundance of P. gibbesi. The presence of small holes, encrusting algae and low slope favour the colonization success of this crustacean, and the spatial distribution of these habitat features could explain the observed pattern. The abundance of P. gibbesi was similar to that of native crab species; however, a non-significant negative relationship between the abundance of P. gibbesi and native crabs (Pachygrapsus marmoratus and Eriphia verrucosa), urchins (Arbacia lixula and Paracentrotus lividus) and a snail (Phorcus turbinatus) was observed. This work highlights the importance of monitoring alien crab population densities taking structural habitat and other potentially influential factors into account and the likely effect of this alien species on the native ones.
... It has since spread rapidly throughout the Mediterranean. In Italian waters, the species spread north from the first record in Linosa (Relini et al. 2000), through Sicily (Pipitone et al. 2001;Mori and Vacchi 2002;Catalano 2004), the Adriatic Sea (Gravili et al. 2010), the Ionian Sea (Faccia and Bianchi 2007;Crocetta and Colamonaco 2010), and the southern (Bellantoni and Corazza 2002) and central Tyrrhenian Sea (Russo and Villani 2005). North of Naples, the distribution of this species is deemed as " not continuous " (Katsanevakis et al. 2011) and, until recently, there were no observations of P. gibbesi north of the Tuscan Archipelago (Stasolla andInnocenti 2014). ...
The non-indigenous crabs Percnon gibbesi (H. Milne Edwards, 1853) and Callinectes sapidus (Rathbun, 1896) (Crustacea, Decapoda, Portunidae) are reported from Genoa and La Spezia, respectively, in the Ligurian Sea at the northern rim of the Mediterranean Sea. Both specimens were collected by fishermen who then brought them to the attention of professional scientists. This illustrates the importance of engaging local communities in detecting non-indigenous species and monitoring their spread.
... Our records together with those reported by Gennaio (2014) from the Salentine shores suggest that populations are already established along the Apulian coastline. According to Crocetta and Colamonaco (2008), the presence of a few specimens suggests that this species has expanded its distribution range recently. Since the presence of this species in other surveyed areas is not confirmed, we can conclude that further studies are necessary to monitor the new populations that could settle, since the Taranto area seems to be conducive to the establishment of non-indigenous species and deserves greater attention, being a hotspot of alien biodiversity. ...
... Our records together with those reported by Gennaio (2014) from the Salentine shores suggest that populations are already established along the Apulian coastline. According to Crocetta and Colamonaco (2008), the presence of a few specimens suggests that this species has expanded its distribution range recently. Since the presence of this species in other surveyed areas is not confirmed, we can conclude that further studies are necessary to monitor the new populations that could settle, since the Taranto area seems to be conducive to the establishment of non-indigenous species and deserves greater attention, being a hotspot of alien biodiversity. ...
This Collective Article presents information on 22 species belonging to 5 Phyla, arranged geographically from west to east. The new records were found in 8 countries as follows: Spain: first record of the two scarcely known nemerteans Baseodiscus de-lineatus and Notospermus geniculatus in Formentera; Malta: second record of the alien fish Lagocephalus sceleratus; Italy: the alien polychaete Syllis pectinans and the isopod Paranthura japonica, as well as the cryptogenic opisthobranch Anteaeolidiella lurana, were found in the fouling assemblages along the docks of the port of Livorno. New decapod records are reported from Sicily (the alien Callinectes sapidus and the native Pachygrapsus maurus) and Apulia (Percnon gibbesi and Procambarus clarkii); the lesser amberjack Seriola fasciata extended its geographical range to the Egadi Isands and Siganus luridus was documented for the first time along the Ionian coasts of Apulia and Calabria. Slovenia: the first record of the alien bivalve Brachidontes pharaonis is reported, together with a survey of up to date Adriatic records. Greece: the first record of the gastropod Rhinoclavis kochi is reported from Gavdos island. In addition, two records of endangered and rare cartilaginous fish were reported, namely, the shark Hexanchus griseus and the ray Leucoraja fullonica, as well as additional records of Siganus luridus for Lesvos and Malleus regula and Fulvia fragilis from Astypalaia. Turkey: the black wing flyingfish Hirundichthys rondeletii is reported for the very first time from the Black Sea. Egypt: the Indo-Pacific crab Halimede ochtodes is reported as established in Port Said. In addition, biometric parameters and meristic counts are reported for Anthias anthias in Damietta. Cyprus: the alien opisthobranch gastropod Bursatella leachii is reported for first time.
... In the Mediterranean Sea, A. dactylomela was observed to feed on Dictyotaceae and Laurencia sp. It has also been observed on dense algal mats with the presence of C. cylindracea (Yokes, 2006;Crocetta and Colamonaco, 2008;Mannino et al., 2014). In addition to oceanographic changes and eutrophication, the presence of non-indigenous algae is proposed as an important factor that might have facilitated the rapid invasion of A. dactylomela in the eastern Mediterranean (Vald es et al., 2013). ...
Using stable isotope analysis, we investigated trophic interactions between indigenous benthic taxa and the non-indigenous species (NIS): the green alga Caulerpa cylindracea, the red alga Asparagopsis taxiformis, the crab Percnon gibbesi and the sea hare Aplysia dactylomela. The study was conducted in Lampedusa Island, Mediterranean Sea. We evaluated the trophic positions and isotopic niches of consumers. Using Bayesian mixing models, we quantified the food source contribution to diets of indigenous and non-indigenous herbivores. Isotopic niche of NIS showed no overlap with the ones of indigenous macroinvertebrates and fish. Caulerpa cylindracea provided the largest contribution to the diet of P. gibbesi (0.431–1), while the dietary contribution estimates overlapped considerably for all sources of A. dactylomela and indigenous herbivores. From these results, we conclude that the invasion of C. cylindracea is increasing the diversity of available prey and might facilitate the expansion of other NIS.
... In the Mediterranean Sea, A. dactylom ela was observed to feed on Dictyotaceae and Laurencia sp. It has also been observed on dense algal mats with the presence of C. cylindracea (Yokes 2006;Crocetta and Colamonaco 2008;Mannino et al. 2014). In addition to oceanographic changes and eutrophication, the presence of non-indigenous algae is proposed as an important factor that might have facilitated the rapid invasion of A. dactylom ela in the eastern Mediterranean (Valdés et al. 2015). ...
The distribution of non-indigenous species (NIS) and the effect of some selected Mediterranean Marine Protected Areas (MPAs) on NIS establishment and spread was assessed using rapid assessment. Trophic interactions between the indigenous benthic taxa and NIS were investigated using stable isotope analysis, in order to determine the role of NIS in invaded ecosystems and possible impacts it has on indigenous taxa. Different protection regimes had no obvious effect on the pattern of benthic NIS spread. However, all fouling NIS and cryptogenic species on mooring lines of leisure craft were recorded outside of MPAs. Isotopic niche of non-indigenous herbivores Aplysia dactylomela and Percnon gibbesi showed no overlap with the ones of indigenous macroinvertebrates and fish. The mixing models indicated that the non-indigenous green alga Caulerpa cylindracea was the most important resource in the diet of the non-indigenous crab Percon gibbesi, thus providing the evidence for the invasion meltdown hypothesis.
... Before there was available genetic evidence showing that Aplysia dactylomela was a species complex, a number of papers attempted to elucidate the origin of the Mediterranean populations. For example, some authors discussed the possibility that the Mediterranean spotted sea hares were an Erythraean alien (from the Red Sea) that entered the Mediterranean via the Suez Canal (e.g., Yokeş 2006; Crocetta and Colamonaco 2010; Kout 2012; Crocetta and Galil 2012). The Red Sea migration hypothesis is supported by the fact that the species is not known from the western Mediterranean (Figure 1). ...
... Some Mediterranean species of Laurencia have been found to be nonnative (Furnari et al. 2001). Aplysia dactylomela has also been found on dense algal film with the presence of the invasive species Caulerpa racemosa (Crocetta and Colamonaco 2010). The eclectic taste of A. dactylomela may have allowed it to take advantage of multiple food sources including possibly native and non-native seaweeds. ...
The spotted sea hare Aplysia dactylomela Rang, 1828 is a large and conspicuous opisthobranch sea slug that since 2002 has rapidly colonized the eastern Mediterranean, establishing populations in numerous localities. The source of the Mediterranean populations has been the subject of debate, with two main hypotheses considered (Atlantic and Red Sea origin). A recent study on the taxonomy of A. dactylomela has shown that the spotted sea hare is a complex of at least two genetically distinct species (A. dactylomela in the Atlantic and A. argus in the Indo-Pacific), facilitating the correct identification of Mediterranean specimens by molecular means. We used sequence data from the mitochondrial cytochrome oxidase I gene to identify the Mediterranean individuals for the first time and to infer their origin. Our results confirmed that all the specimens collected in the Mediterranean belong to A. dactylomela and therefore have an Atlantic origin. The limited sample size does not allow identification of the dispersal pathway of A. dactylomela into the Mediterranean, but the colonization sequence is consistent with a "natural" dispersal event. This hypothesis is evaluated in light of local surface circulation patterns. Possible causes for the recent and rapid invasion of the eastern Mediterranean by A. dactylomela are discussed.
... These new findings, their proximity with shellfish retail shops and the frequent observations of shellfish immersions in the natural environment (E. Cecere and A. Petrocelli, unpublished data) well support the hypothesis of introductions via the import of Japanese oysters C. gigas, mussels Mytilus spp., or Japanese clams Ruditapes philippinarum (Adams & Reeves) (Crocetta and Colamonaco 2010). ...
Eight specimens of phreodrilid oligochaetes belonging to the genus Insulodrilus were found in intertidal sediment in the upper Thames estuary (Wandsworth, London) in November 2012. This is the first confirmed record of Insulodrilus in the northern hemisphere, although immature specimens previously collected in Northern Ireland may belong in this genus.
... These new findings, their proximity with shellfish retail shops and the frequent observations of shellfish immersions in the natural environment (E. Cecere and A. Petrocelli, unpublished data) well support the hypothesis of introductions via the import of Japanese oysters C. gigas, mussels Mytilus spp., or Japanese clams Ruditapes philippinarum (Adams & Reeves) (Crocetta and Colamonaco 2010). ...
Three alien macrophytes, Ascophyllum nodosum, Colpomenia peregrina and Polysiphonia morrowii, are reported for the first time from the Mar Piccolo of Taranto (southern Italy, Mediterranean Sea). Two other species, Agardhiella subulata and Codium fragile subsp. fragile that were not, or were sporadically, detected in the basin since their first record in 1987 and 2002, respectively, were also recorded. In the Mar Piccolo, there appears to be a close link between establishment of alien species and the regular import of shellfish for direct sale. To limit the flow of accidental species introductions, a continuous and rigorous control of all the economic activities performed along the coast is recommended through the enforcement of effective laws and an early detection of new introductions.
