Abstract
In this study, size compositions of Aurelia aurita (Linnaeus, 1758), Pleurobrachia pileus (O. F. Müller, 1776) and Mnemiopsis leidyi A. Agassiz, 1865 were presented seasonally between March 2015 and February 2016 at the Sinop Peninsula of Black Sea. Sampling was carried out monthly at the 6 stations by plankton net (50 cm diameter mouth opening, 500 mm mesh size for horizontal tows, 210 mm mesh size for vertical tows). Small sized individuals of A. aurita, M. leidyi and P. pileus were found dominant in summer. Bigger size individuals were observed for A. aurita in spring, M. leidyi in winter, and P. pileus in autumn. A. aurita ˂4 cm was determined as 57%, M. leidyi ˂2 cm was 58% and P. pileus ˂ 0.6 was determined as 67%. Maximum and minimum lengths were measured 28 cm and 0.5 cm for A. aurita, 2 cm and 0.2 cm for P. pileus, 9 cm and 0.2 cm for M. leidyi, respectively. The size distribution of A. aurita, M. leidyi and P. pileus showed significantly different (ANOVA, p˂0.05) between seasons.
Highlights
Gelatinous macrozooplankton play a crucial role in the cycle of the food chain in fisheries-based ecosystems
Seasonal size compositions of A. aurita, M. leidyi and P. pileus at Sinop Peninsula of the Black Sea were investigated between March 2015 and February 2016
In 2008, it was reported that 4-6 cm A. aurita was dominant in spring and summer in the southern coasts of central Black Sea (Birinci Özdemir, 2011)
Summary
Gelatinous macrozooplankton play a crucial role in the cycle of the food chain in fisheries-based ecosystems. These organisms have controlled whole ecosystem (Oguz et al, 2001, Purcell et al, 1999). Gelatinous populations are opportunistic and can quickly adapt to changes in physical and biological conditions in aquatic systems. Increasing abundance of gelatinous due to global climate change, uncontrolled fishing, eutrophication of coastal areas caused negative changes in the Black Sea ecosystem in the last 2030 years (Kideys, 2002; Bat et al, 2007; Bat et al, 2009). Aurelia aurita and invader Mnemiopsis leidyi reached high abundances in Black Sea
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