Naslov
Sclerochronology and population structure of a commercially important bivalve – the smooth clam Callista chione in the eastern Adriatic Sea

Autori
Peharda, Melita ; Ezgeta-Balić, Daria ; Richardson, Chris ; Vrgoč, Nedo ; Isajlović, Igor

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

Izvornik
2nd International Sclerochronology Conference / Schone, Bernd R. ; Nunn, Elizabeth V. - Berlin : GeoUnion Alfred-Wegener-Stiftung, 2010, 64-64

Skup
2nd International Sclerochronology Conference

Mjesto i datum
Mainz, Njemačka, 24.07.2010. - 28.07.2010

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
bivalve; age; growth; population structure

Sažetak
The age, growth, and population structure of the commercially important smooth clam Callista chione in the eastern Adriatic Sea were reconstructed from annually-resolved growth lines in the shell. Clams were collected during 2007 and 2008 using either a hydraulic dredge or commercial SCUBA diving at four locations (Rab Island, Pag Bay, Cetina estuary and Kaštela Bay) in Croatian coastal waters. The age of 436 clam shells was determined from the internal growth lines present in shell cross sections and the timing of growth line formation was ascertained from monthly collections of clams to occur between August and September during the period when sea water temperatures were maximal. Differences were apparent in the age structure and growth rates of clams collected from the four locations. Von Bertalanffy growth (VBG) curves obtained for clams from these locations were Lt = 72.4 (1–e–0.25 (t- 2.68)) (Rab Island), Lt = 74.5 (1–e–0.15 (t+0.57)) (Pag Bay), Lt = 79.3 (1–e–0.34(t-0.97)) (Cetina estuary), and Lt = 82.5 (1–e–0.11 (t+2.88)) (Kaštela Bay). The age of the smooth clams ranged between 3 and 44 years whilst median clam ages were similar at three of the four locations i.e. 14, 12, 4 and 12 years respectively. The VBG growth constants recorded from clams in this study are within the range of values obtained by previous authors for the species. The observed differences in population structure between locations indicate different levels of exploitation and illustrate the need for establishing long term strategies for the sustainable exploitation of smooth clams in the Croatian Adriatic.

Izvorni jezik
Engleski

Znanstvena područja
Biologija, Biotehnologija

POVEZANOST RADA