Ecological Changes in the Sea of Marmara

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DOI :10.26650/B/LSB21LSB37.2024.023.020   IUP :10.26650/B/LSB21LSB37.2024.023.020    Full Text (PDF)

Soft-Bottom Macrobenthic Assemblages Around the South Marmara Islands (Sea of Marmara)

Melih Ertan Çınar, Murat Bilecenoğlu, Mehmet Baki Yokeş, Harun Güçlüsoy

 Bottom-trawl haulings at 10 stations around the south Marmara Islands (Sea of Marmara) to explore benthic community structures and the distribution of alien species within the framework of the project MarIAS yielded a total of 153 species belonging to 10 taxonomic groups (Porifera, Cnidaria, Nemertea, Annelida, Crustacea, Mollusca, Echinodermata, Tunicata, Chondrichthyes and Osteichthyes). Among the species, the holothurid Molpadia musculus is a new record for the marine fauna of Türkiye and two species (Dentex maroccanus and Aristeus antennatus) are new records for the Sea of Marmara. The trawl material included 148 benthic/demersal and 5 pelagic species. Two species (Pantobdella muricata and Anilocra physoides) were parasitic on fish. The highest number of benthic/demersal species (24% of total species number) belonged to Osteichthyes, the highest number of individuals belonged to Crustacea (56% of total populations). Although changing with the locality, Parapenaeus longirostris (31% of total populations), Plesionika heterocarpus (23%) and Serranus hepatus (10%) were the most dominant species in general. The species with 100% occurrence in the area were Alcyonium palmatum, Antedon mediterranea, Astropecten irregularis, Ophiura ophiura and Serranus hepatus. The abundance of Crustacea considerably changed with depth. The diversity index ranged from 1.4 to 4.3 in the area and the evenness index from 0.28 to 0.76. Three major species assemblages (similarity >45%) were determined in the area, and main factors responsible for the delineation of the assemblages were found to be depth and habitat types (location). In the trawl material, only one alien species (Anadara kagoshimensis) was found with a few number of individuals. The present study provides valuable information on the biodiversity and distribution of macrobenthic species off the south Marmara Islands, which can be used for future conservation efforts and management strategies.


Keywords: Bottom Trawl, macrobenthos, alien species, species assemblages, south Marmara Islands, Sea of Marmara

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