Naslov
Zooplankton in bivalve diets

Autori
Ezgeta-Balić, Daria ; Peharda, Melita ; Davenport, John ; Bojanić, Natalia ; Vidjak, Olja ; Isajlović, Igor ; Vrgoč, Nedo

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, ostalo

Izvornik
Book of abstract from 46th European Marine Biology Symposium / Travizi, Ana ; Iveša, Ljiljana ; Fafanđel, Maja - Rovinj : Institute Ruđer Bošković, 2011

Skup
46th European Marine Biology Simposium

Mjesto i datum
Rovinj, Hrvatska, 12.09.2011. - 16.09.2011

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Nije recenziran

Ključne riječi
Mytilus galloprovincialis; Ostrea edulis; Modiolus barbatus; Arca noae; bivalve feeding

Sažetak
Several previous studies have showed that bivalve molluscs feed on zooplankton, but none of them have provided information about differential utilization of zooplankton amongst species coexisting in the same area over a long period of time. The study was conducted at Mali Ston Bay – the largest bivalve aquaculture area in the eastern Adriatic Sea, where all production relies entirely on seed collected from nature. We analyzed the stomach contents of two cultured species - the European flat oyster (Ostrea edulis) and the black mussel (Mytilus galloprovincialis), plus two commercially important bivalve species from their natural environment and also from experimental aquaculture – the bearded horse mussel (Modiolus barbatus) and the Noah’s ark shell (Arca noae). The main objectives were to determine whether the investigated bivalves ingested zooplankton and to determine whether stomach contents’ zooplankton composition varied with respect to species and season. Zooplanktonic organisms were presented in the stomach contents of 97% of M. galloprovincialis and 77% of O. edulis, 62% of M. barbatus and 55% of A. noae from a natural population, and 86 % of both M. barbatus and A. noae collected from experimental aquaculture. Results showed significant differences in zooplankton ingestion among investigated species and also significant seasonal variations in food sources amongst all species. The most abundant ingested taxa were bivalve larvae, followed by tintinnids, copepods, unidentified eggs and gastropod larvae. Other zooplanktonic organisms such as foraminiferans, cyprids, polychaete larvae, ostracods and amphipods were found only sporadically in bivalve stomach contents. Observed bivalve larviphagy during this study is so far the highest reported in the literature. Since the aquaculture of Mali Ston Bay relies only on natural spatfall, the observed larviphagy could have negative impacts both on cultured and natural bivalve populations.

Izvorni jezik
Engleski

Znanstvena područja
Biologija

POVEZANOST RADA