O pojavi Pinctada radiata (Mollusca: Bivalvia: Pteriidae) u hrvatskim vodama Jadrana

Two specimens of lessepsian bivalve Pinctada radiata were encountered in a benthic study conducted at a depth of 59 m on a silty-sand bottom in the northern Adriatic Sea, Croatia, in April 2006. This is the first record of the species in the Croatian part of Adriatic Sea.Dva primjerka školjkaša Pinctada radiata, lesepsijskog migranta, su nađena prilikom bentoskog istraživanju u sjevernom Jadranu na dubini od 59 m na siltoznom pijesku, u travnju 2006. Ovo je novi nalaz spomenute vrste u hrvatskim vodama Jadrana

Dodatne informacije o plavom trkaču, Caranx crysos (Mitchill, 1815), u sjevernom Jadranu: meristička i molekularna karakterizacija

In October 2014, a blue runner (Caranx crysos) was caught by a professional fisherman in waters off St. Eufemija Point (west Istrian Coast, northern Adriatic Sea, Croatia). This is the second recorded blue runner in the northern Adriatic Sea, which represents the northernmost biogeographic sector of the Mediterranean Sea. Recently, blue runners were recorded in the southern and central Adriatic Sea, suggesting that the central Mediterranean C. crysos is expanding its area of distribution throughout the Adriatic Sea. As a point of interest, this most recent specimen presented an unusual meristic feature: the number of spines of its first dorsal fin was VI, whereas it is generally recognised that the number of such spines characteristic for this species is VIII. Species identity of the specimen was confirmed by DNA sequence analysis of the mitochondrial cytochrome c oxidase subunit I (COI) gene. In addition, we provided the first report of C. crysos mitochondrial 16S ribosomal RNA (16S rRNA) partial sequence.U listopadu 2014. godine, ribu plavi trkač (Caranx crysos) je ulovio profesionalni ribar nekoliko stotina metara van rta Sv. Eufemija (zapadna obala Istre, sjeverni Jadran, Hrvatska). Ovo je drugi po redu nalaz ribe plavi trkač koja je ulovljena u sjevernom Jadranu, što predstavlja najsjevernije biogeografsko područje sredozemnog mora. Nedavno ova vrsta je zabilježena u južnom i srednjem Jadranu što ukazuje da se populacija C. crysos iz središnjeg Sredozemnog mora proširuje u Jadranskom moru. Razmatrani primjerak je pokazao neobičnu merističku značajku: broj bodlji u prvoj leđnoj peraji je VI, dok je općenito za ovu vrstu prihvaćeno (priznato) VIII bodlji. Identitet vrste potvrđen je analizom mitohondrijske DNA sekvence za pod-jedinicu I gena citokrom c oksidaze (COI). U ovom radu također je po prvi put analiziran dio mitohondrijske DNA sekvence odgovorne za kodiranje 16S ribosomske RNA (16S rDNA) kod vrste C. crysos

Response to oxygen deficiency (depletion): Bivalve assemblages as an indicator of ecosystem instability in the northern Adriatic Sea

Benthic communities represent a powerful tool for the detection of natural and anthropogenic disturbances, as well as for the assessment of marine ecosystem stability. This paper shows that bivalve assemblages could serve as excellent indicators of disturbance and ecosystem instability. The goal of this study was to compare two sets of data in order to determine the differences between two different periods belonging to bivalve assemblage in the muddy detritic bottom of the northern Adriatic Sea in the post-anoxic period during December 1989, 1990, 1991 and quite a while later, during 2003, 2004 and 2005. Abundances of some indicator species such as Corbula gibba, Modiolarca subpicta and Timoclea ovata were detected during the post-anoxic period. Recruitment in the quality of bivalve assemblages was proved by the ecologic and biotic indexes during 2003, 2004 and 2005, during a period of relatively stable ecological conditions. Fluctuation in bivalve diversity due to the ecological quality of the marine ecosystem in the eastern part of the northern Adriatic Sea is also discusse