Alien Species on the Coasts of Turkey
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Mediterranean Marine Science Volume 6/2, 2005, 119-146 Alien species on the coasts of Turkey M. e. ÇiNAR1, M. bileceNoĞlu2, b. ÖztÜRK1, T. KATAGAN1 and V. AYSel3 1.Ege University, Faculty of Fisheries, Department of Hydrobiology, 35100 Bornova, Izmir, Turkey 2.Adnan Menderes University, Faculty of Arts & Sciences, Department of Biology, 09010 Aydin, Turkey 3.Onsekiz Mart University, Faculty of Arts & Sciences, Department of Biology, Çanakkale, Turkey e-mail: [email protected] Abstract 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 ecosytems are presented. Keywords: Alien species; Species list; Impact; Black Sea; Sea of Marmara; Aegean Sea; Levantine Sea; Turkey. Intoduction capable of colonizing every ecosystem on earth, changing the ecological relations within com- Species introduction is one of the major munities, altering evolutionary processes and factors adversely affecting biological diversity causing dramatic changes in native populations, (ELTON, 1958). The impacts of alien species including extinctions (MACK et al., 2000). on their new environment include restructuring The negative effects of aliens experienced established food webs, importing new diseases world-wide have triggered the social and sci- and competition with native organisms for food entific media to take some precautions against and space. Other significant ecological changes the dispersal of aliens among regions or among may occur when the invading organisms repro- localities within a particular region.Thus, com- duce with native species, altering the gene pool piled data regarding all aliens or a target or- (OCCHIPINTI AMBROGI, 2001). Invaders ganism (i.e. Caulerpa taxifolia in the Mediter- may belong to any taxonomical group, and are ranean Sea) are urgently required by scientists Medit. Mar. Sci, 6/2, 2005, 119-146 119 Results and Discussion and decision makers. In addition, monitoring programmes on spatio-temporal structures of List of alien species from the Turkish coasts communities particularly in the hot spot areas for aliens such as harbours, brackish and pol- Table 1 includes all alien species reported luted waters should be undertaken both on local from the Turkish coasts. The species are catego- and global scales. rized by their origins, the mode of introduction Turkey is surrounded by four seas with dif- and their habitat and depth preferences. The es- ferent hydrographical characteristics. The mari- tablishment success is assigned for each species. time traffic taking place through the Dardanel The first reported years of the species together and Bosphorus straits and among commercial with the relavant publications are also given for harbours makes the Turkish coasts more sus- each sea. ceptible to invasions by aliens. The proximity of The present data show that a total of 263 Turkey to the Suez Canal has resulted in dense alien species, which belong to 11 systematic settlements of Lessepsian migrants, especially groups, occur along the Turkish coasts. Among in habitats along the Levantine coast of Turkey. the groups, Mollusca had the highest number Alien species and their roles in the benthic and of species (85 species), followed by Crustacea pelagic ecosytems is increasingly becoming a (51), fishes (43) and phytobenthos (39). Cni- subject of study in the country. daria is represented by only two species (Rho- This paper reviews the alien species reported pilema nomadica and Cassiopea andromeda), from the Turkish coasts and constitutes the first Ctenophora by 2 species (Mnemiopsis leidyi and comprehensive database for future studies. Beroe ovata), Pantopoda by one species (Ano- plodactylus californicus), Bryozoa by one spe- Methods cies (Rhynchozoon larreyi) and Echinodermata by 2 species (Ophiactis savignyi and Synaptula Data on alien species along the Turkish coasts reciprocans). Thirty-two species are considered as ques- In this study, only reported data on aliens tionable or excluded in Table 1, mainly due to the along the Turkish coasts have been taken into uncertainty in their real taxonomical status and account. All calculations are based on species’ distributional patterns. The polychaetes, Bran- records up to the end of 2005. Cryptogenic spe- chiosyllis exilis, Opisthosyllis brunnea, Rhod- cies have not been included in our compiled list. ine loveni and Monticellina dorsobranchialis, Some of the species in Table 1, which represent which were previously considered as Lessepsian uncertainty in their real taxonomic position and migrants, indeed occur also in the western Medi- distributional pattern, are classified as question- terranean and the Atlantic Ocean. These species able or excluded. The questionable species will were also previously proposed to be excluded turn into aliens if their real taxonomic and dis- from the list of Lessepsian species (ERGEN tributional identities are clarified. In all calcula- et al., 2002; ÇINAR, 2003; 2005). RULLIER tions, including number of species per sea, only (1963) found 11 polychaete species with Indo- the established and questionable species have Pacific affinity from the Sea of Marmara (Table been taken into account. The importance of al- 1). Of the species, Nereis zonata persica and iens in the total biota was estimated, based on Timarete ancylochaeta were also reported along the authors’ databases. the Levantine coast and considered as Lessep- sian migrants (BEN-ELIAHU, 1995). The other species have not been subsequently reported from elsewhere in the Mediterranean Sea. A total of 176 Lessepsian and 48 ship-trans- ferred species were reported along the Turkish 120 Medit. Mar. Sci, 6/2, 2005, 119-146 Table 1. the list of alien species and their first year of reports from thet urkish coasts. the habitat and depth preferences of aliens along the coasts together with their origins and establishment success are also given. the marked species in the list are questionable or excluded ones. bS: black Sea, SM: Sea of Marmara, AS: Aegean Sea, lS: levantine Sea, o: origin (ip: indopacific, RS: Red Sea, tA : Atlantic, WA: Western Atlantic, St: Subtropical, io: indian ocean, pg: persian gulf, po: pacific ocean, tA: tropical Atlantic, ct: circumtropical, bA: boreal Atlantic) es: establishment success (e: established, Q: Questinable, ex: excluded), Mi= Mode of introduction (l: lessepsian, S: Shipping, g: gibraltar, Aq: Aquaculture), H: Habitat [hs: hard substrata (including algae, sponge), Ss: soft substrata (includ- ing phanerogams), p: pelagic, pz: parasite], D: depth range (i: 0-10 m, ii: 11-50m, iii: 51-100 m, iV: 101-200 m, V: 201-400, Vi: 401-500 m). BS SM AS LS Es O MI H D phYTOPLANKTON Alexandrium tamarense (Lebour) - - 1984124 - Q WA S P I Balech 1992 Chaetoceros coarctatus Lauder 1864 - - 1987125 - E AT,PO S P I Gymnodinium cf. mikimotoi Miyake et - - 200244 - Q ? S P I Kominami ex Oda 1935 Heterosigma cf. akashiwo (Hada) Hada, - - 200244 - Q ? S P I 1968 Rhizosolenia calcar-avis M. Schultze, 199971 1993123 - - E AT S P I 1858 Scrippsiella trochoidea (Stein) Loeblich 199971 - - - E AT S P I III, 1976 Thalassiosira nordenskioeldii Cleve 2002160 - - - E AT S P I 1873 phYTOBENthoS cyanophyta (=cyanobacteria) Trichodesmium erythraeum Ehrenberg, - - 199669 - E IP,RS L Hs,Ss I 1830 Rhodophyta Acanthophora nayadiformis (Delile) - 1973177 1970103 199720 E RS L Hs I,II Papenfuss, 1968 Acanthophora muscoides Linnaeus, - - 1986178 - E AT S Hs I,II 1753 Acrochaetium codicolum Børgesen, 199628 1986178 199055 199719 E IP,AT S Hs,Ss I 1927 Asparagopsis armata Harvey, 1855 1973176 1986178 1973176 1969174 E IP,AT S Hs I Asparagopsis taxiformis (Delile) - - 200127 - E CT L Hs I Trevisan de Saint-Léon, 1845 Bonnemaisonia hamifera Hariot, 1891 - 1986178 - 199720 E PO,AT ?S Hs I Botryocladia madagascariensis - - - 2000161 E IO ?S Hs I G.Feldmann, 1945 Chondria collinsiana Howe, 1920 - 1986178 - - E AT, IO ?L Hs II Chondrophycus papillosus (C. Agardh) 1973175 1957143 1969174 1969174 E RS ?L Hs I Garbary & Harper 1998 Ganonema farinosum (Lamouroux) Fan 199521 189991 198626 199719 Q IP,RS ?L Hs,Ss I & Wang, 1974 (continued) Medit. Mar. Sci, 6/2, 2005, 119-146 121 table 1 (continued) BS SM AS LS Es O MI H D Gracilaria arcuata Zanardini 1858 - 1986178 - - E RS,IP L Hs I Griffithsia corallinoides(Linnaeus) - 199323 - - E AT, IP G Hs I Trevisan, 1845 Hypnea spinella (C. Agardh) Kützing, - - 198718 - E AT,IP S Hs I 1847 Hypnea variabilis Okamura, 1909 - 1986178 1986178 - E PO S Hs I Laurencia intermedia Yamada, 1931 198626 - - - E PO,RS S Hs I,II Lophocladia lallemandii (Montagne) - - 1970103 198653 E IP L Hs I,II Schmitz, 1893 Polysiphonia fucoides (Hudson) 1973176 - 1973176 - E AT, IO S Hs I,II Greville, 1824 Polysiphonia paniculata