Vol.18 – 2012

The qualitative and quantitative distribution of the zooplankton in the Southeastern Black Sea (Trabzon coast)

Gülnur Penbe Özdemir, Orhan Ak

Central Fisheries Research Institute, Kaşüstü, 61250, Trabzon, TURKEY

Abstract

In the present study, the qualitative and quantitative changes of zooplankton community were examined on a monthly basis at three stations off the coast of Trabzon, the South- eastern Black Sea from October 2007 to September 2008. A total of 36 samples were collected. The highest value of the abundance of the total zooplankton was recorded in May. Noctiluca scintillans was the most abundant zooplankton with a share of 54% (maximum: 3752,80 ind.m^-3 in May). They were followed by Copepoda with 21% (maximum: 551 ind.m^-3 in March and Cladocera with 13% (maximum: 680 ind.m^-3 in August. Copepoda was present in the sampling throughout the year whereas N. scintillans and Cladocera were dominant for a period of 2-3 months. The annual average abundance of zooplankton was 1116±282 ind.m^-3 (55989 ind./m²). In addition temperature as main physical parameter of environment was determined according to the depth.

Keywords: Black Sea, zooplankton abundance, monthly vertical distribution

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The swimming crab Portunus segnis (Forskål, 1775): host for the barnacle Chelonibia platula (Ranzani, 1818) from the Turkish coast

Tahir Özcan

Department of Marine Biology, Fisheries Faculty, Mustafa Kemal University, 31200 Iskenderun, Hatay, TURKEY

Abstract

During May 2011, the symbiotic barnacles Chelonibia patula (Ranzani, 1820) was collected in Iskenderun and Mersin Bays on the Levantine coast of Turkey. Three specimens of the swimming crab Portunus segnis (Forskål, 1775) and two specimens of the blue crab Callinectes sapidus Rathbun, 1896 infested by C. patula were obtained. This is the first record of C. patula on the carapace and cheliped of P. segnis from the Turkish coasts. Besides, it was also found that within the frame of this study C. patula has expanded its distribution range on C. sapidus carapace from Iskenderun to Mersin Bay, Levantine coast of Turkey.

Keywords: Chelonibia patula, Portunus segnis, barnacle, epibiosis, Turkey, Mediterranean Sea.

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