Izvorni znanstveni članak

Effects of bottom trawling on the benthic assemblages in the south Adriatic Sea (Montenegro)

Slavica PETOVIĆ ; Institute of Marine Biology, University of Montenegro, Dobrota bb, P.O. Box 69, 85330 Kotor, Montenegro
Olivera MARKOVIĆ ; Institute of Marine Biology, University of Montenegro, Dobrota bb, P.O. Box 69, 85330 Kotor, Montenegro
Zdravko IKICA ; Institute of Marine Biology, University of Montenegro, Dobrota bb, P.O. Box 69, 85330 Kotor, Montenegro
Mirko ĐUROVIĆ ; Institute of Marine Biology, University of Montenegro, Dobrota bb, P.O. Box 69, 85330 Kotor, Montenegro
Aleksandar JOKSIMOVIĆ ; Institute of Marine Biology, University of Montenegro, Dobrota bb, P.O. Box 69, 85330 Kotor, Montenegro

Sažetak

The purpose of this study is to show the effects of bottom trawling on the benthic assemblages in the south Adriatic Sea as well as to report detailed quantitative and qualitative data on some
invertebrate groups of no commercial value that are affected by trawling. Short-term effects of bottom trawling on the soft bottom seafloor were studied on the continental shelf and upper slope in the southeastern Adriatic Sea. Ten sites were trawled in July 2011. A total of 14,069 invertebrate organisms belonging to 44 taxa were collected within the study period. Of these, 93 were Sponges
(4 species), 509 Cnidarians (7 species), 3,670 Molluscs (5 species), 48 Bryozoa (1 species), 3,154 Echinoderms (14 species), and 7,054 Tunicates (13 species). Cluster analysis performed with the data from different depth layers showed two clearly separated main groups that corresponded to shelf and slope zone. The shelf zone samples were characterized by higher species richness, while samples taken from the slope contained one species, Pteroeides spinosums. The obtained results showed that the most common species during the survey were Pteria hirundo, Ascidia virginea, Phallusia mammillata, Botryllus schlosseri, and Centrostephanus longispinus. Species P. mammillata, B. schlosseri, and P. regalis presented the highest value of biomass index (kg/km2). Our results showed that ascidians, cnidarians, and echinoderms are the most vulnerable taxa to trawling.

Ključne riječi

bottom trawling; ecological impact; invertebrates; benthic assemblage; Adriatic Sea

Hrčak ID:

162289

URI

https://hrcak.srce.hr/162289

Datum izdavanja:

28.6.2016.

Podaci na drugim jezicima: hrvatski

Posjeta: 1.703 *