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Biogeographia vol. XXV - 2004 (Printed December, 30 ’q 2004) Marine Biogeography of the Mediterranean Sea: patterns and dynamics of biodiversity On the distribution of the allochthonous bivalves Amzdozm inrzequivazlvis (Bruguiere, 1789), Amzolczm demiri (Piani, 1981) and Musculistcz sennouszkz (Benson in Cantor, 1842) in the Adriatic Sea, Italy ELISABETTA MORELLO, CRISTIANO SOLUSTRI, BRUNO ANTOLINI, CARLO FROGLIA ISZWAR - CN R., Seziane Perm Mzzrz't'rz'mzz, Largo Fiem del/zz Perm, 60125 A72£'07’l[l (Italy) Key words: allochthonous species, Adriatic Sea, distribution, Arcidae, Mytilidae. S UMMARY The distribution patterns in the Adriatic Sea of three bivalves ofIndo—Pacific origin, Armdzmz 1'11/zcqzziz/:1/vir, Amzdnm zlemiri and M1/sat/ism rm/vozrrizz, were investigated. Analysis of a population of/1. izzzzequizzzzlvis in the central Adriatic confirmed the occurrence of years of conspicuous recruitment Followed by years of intense growth and poor recruitment events. Extensive sampling of northern and central Adriatic inshore waters revealed the presence off]. 1/emz'ri from Jesolo to Vzxsto, whilst M. sell/Jouritz, previously found in brackish waters and enclosed bays only, was found to have sticcessfillly colonisedopen sea areas between Porto Garibaldi and S. Benedetto del Tronto. INTRODUCTION The number of species of Indo—Pacific origin which have made their appearance in the Mediterranean Sea has increased dramatically in the past decade. Their entrance into the basin can be attributed to both anthropogenic activities (e.g., aquaculture, shipping, fisheries, etc.) and natural phenomena (lessepsian migration). In the case of several species, favourable environmental conditions have induced considerable population booms. Significant examples are given by the Manila clam, Tapes p/ailzjipinamin (Adams and Reeve, 1850), which was introduced in Chioggia lagoon in 1983 for aquaculture (Cesari and Pellizzato, 1985) and the mussel, Brat/aidontesp/mraonis (Fischer, 1870), a true lessepsian migrant first recorded in the Mediterranean Sea only after the opening of the Suez canal and reported at Port Said in the early 1900s (Pallary, 1912). |
