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Mutlu E.,Akdeniz University | Ergev M.B.,Derinsu Underwater Engineering and Consulting Company
Turkish Journal of Zoology | Year: 2013

Distribution of crustaceans in 3 transects (including depths of 10, 25, 50, 75, 100, and 200 m) of oligotrophics of bottoms of the Levantine Sea shelf located near Kumkuyu, Limonlu, and Erdemli was studied in 2000 to show its association with depth-dependent environmental parameters in representative months of each season (winter, spring, summer, and autumn). A total of 90 crustacean species was found; species richness was highest in winter and autumn and between 50 and 100 m in depth. There was a peak value in abundances in the warm season and at a depth interval of 10 to 50 m, whereas highest values of biomass were recorded in May and August and at a depth of 25 m. A seasonal variation at depths shallower than 75 m was observed for evenness values, which were more stable in deeper waters in all seasons. Two main crustacean assemblages were determined, the first corresponding to shallow bottoms (10, 25-100 m) and the other to deeper bottoms (150-200 m). Besides the grain size and total organic carbon content of the sediment, depth is the most important factor in determining the crustacean assemblage. Hydrographic characteristics of the water column made up 2 seasonal crustacean assemblages: the first in February and May, and the other in August and November. Therefore, all factors governing the crustacean distribution were found to be related to the bottom depth. © Tübitak.

Mutlu E.,Dokuz Eylül University | Ergev M.B.,Derinsu Underwater Engineering and Consulting Company
Cahiers de Biologie Marine | Year: 2010

Populations of Diogenes pugilator on the sand bottom of the Eastern Mediterranean showed annual density peaks in winter and summer. In a two-year period, monthly biomass and abundance did not vary statistically. Biomass and abundance ranged from up to 3000 g ha-1 and 20000 ind ha-1 to almost absence of specimens in autumn. Densities were negatively correlated with silt content of the sediment, but not with physical parameters of water or other sedimentary characters. Most individuals occupied shells of three nassarid gastropod species (Nassarius gibbosulus, N. circumcinctus and N. mutabilis) but shells from 27 species were found to be utilized. Diversity of the shells was variable throughout the year. Total length of the hermit crab accounted for 73% of the total variance in the discrimination of shell partition. Total lengths spanned to be shorter for the crabs occupying Phorcus mutabilis and Muricopsis cristata than those inside the shells of Astraea sp. The shells of some species (Nassarius cuvierii, Ocinebrina aciculata, Strombus persicus and Nassarius wolffi) hosted lightweighed crabs with low statistical variation on the second component of the discriminant distance.

A total of 44 molluscan species belonging to 5 classes were identified in 3 transects (including depths of 10, 25, 50, 75, 100 and 200 m) located in Kumkuyu, Limonlu, and Erdemli. Overall, no significant difference in community parameters such as diversity index, evenness index, and species richness was found among transects. The species abundance showed seasonal and depth-wise variations. The highest species richness (6-16 species) was encountered between depths of 10 and 100 m in winter and spring, whereas the molluscan population increased in warm seasons due to the high abundance of Corbula gibba and Nucula nitidosa. Bivalves and gastropods were abundantly found at depths of 10-200 m, 10-25 m, and 75-100 m. Two main molluscan assemblages were determined: the first assemblage occurred in the shallow water (10-50 m) and was characterized by high abundances of C. gibba, Abra alba, and Tellimya ferruginosa, and the second occurred in deep waters (75-200 m) and was characterized by the presence of Falcidens gutturosus, N. nitidosa, and Astarte fusca. Depth, the fine-grain size of sediment, and total organic carbon were the main factors governing the distribution of the mollusks in the area. Among the species, only Conomurex persicus was an alien species. © TÜBİTAK.

Mutlu E.,Dokuz Eylül University | Cinar M.E.,Ege University | Ergev M.B.,Derinsu Underwater Engineering and Consulting Company
Journal of Marine Systems | Year: 2010

A study of the spatio (three transects: each transect consisted of depths of 10, 25, 50, 75, 100, 150 and 200 m), seasonal (February, May, August and November) distribution of polychaetes was conducted on soft bottoms of the Levantine Sea shelf in 2000. A total of 184 Polychaeta species were found, of which 12 species were new records for the Turkish fauna, 72 species for the Turkish Levantine coast. Species richness encountered in winter was higher than that in other seasons. Species richness also varied along the shelf depth gradient, with the highest values found between 50 and 100 m. Abundances of polychaetes were higher in warm seasons (August and November) and peaked at depths of 25-50 m, whereas biomass was higher in May and August, and peaked at 50 m. Evenness index values showed a seasonal variation at depths shallower than 75 m, whereas it seemed to be more stable in deeper waters in all seasons. In the studied area, there were three main polychaete assemblages occurring: shallow waters (10-25; 50 m), intermediate zone (75-100 m), and deep waters (150-200 m). Depth was the main factor governing the distribution of polychaetes in the area. In addition, the grain size of the sediment and Total Organic Carbon (TOC) also significantly affected the polychaete composition and abundances. © 2009 Elsevier B.V. All rights reserved.

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