Naslov
Invasive Magallana gigas and native Ostrea edulis oysters in the northern adriatic sea – is there an overlap in their distribution?

Autori
Stagličić, Nika ; Šegvić Bubić, Tanja ; Grubišić, Leon ; Bojanić Varezić, Dubravka ; Ezgeta-Balić, Daria

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

Izvornik
Zbornik sažetaka (Hrvatski simpozij o invazivnim vrstama s međunarodnim sudjelovanjem) / Jelaska, Sven D. - Zagreb : Hrvatsko ekološko društvo, 2018, 75-75

Skup
3. hrvatski simpozij o invazivnim vrstama = 3rd Croatian Symposium on Invasive Species

Mjesto i datum
Zagreb, Hrvatska, 26.11.2018. - 27.11.2018

Vrsta sudjelovanja
Poster

Vrsta recenzije
Domaća recenzija

Ključne riječi
Crassostrea gigas, pacific oyster, Lim Bay, Istria, depth distribution, abundance

Sažetak
In the Adriatic Sea non-native invasive oyster Magallana gigas started to spread mostly in the Northern Adriatic. A spread of invasive species could pose a threat to the ecosystem stability and function that in the case of M. gigas could be expressed through competition for space and food with other species, habitat modification, etc. Given the high invasion success of M. gigas, the aim of this study was to investigate whether the native and non-native oysters are in competition for space in their natural habitats. The distribution and abundance of oysters were determined along Istria west coast by in-situ visual counts at 3 depth zones (surface, 3m, 6m) of 6 locations (2 within the Lim estuary, 2 on Istria coastline north and 2 on coastline south to the estuary). Ostrea edulis mostly occurred as solitary specimens and density slightly increased with depth. Magallana gigas were found exclusively at the surface layer where it formed thick, dense clusters resulting in much higher densities compared to O. edulis in all locations (10.4±4.9 to 141.7±31.2ind/m2 vs. 0.5±1.8 to 1.0±2.4ind/m2 ) except to the north of estuary where the distribution and abundance of two species resembled (0.5±1.8 to 3.6±5.0ind/m2 vs. 1.6±2.8 to 2.1±3.1ind/m2 ). Results suggested that there is no overlap in depth distribution and Magallana gigas were located always in the medio-littoral zone while all recorded O. edulis were below the low–tide line. This study presents first quantitative assessment of M. gigas in the Adriatic and provides a base for monitoring changes in its distribution.

Izvorni jezik
Engleski

Znanstvena područja
Biologija

POVEZANOST RADA