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Seasonal Distribution of Gelatinous Macrozooplankton in the Hamsilos Bay, Southern Black Sea, Turkey

The present study describes the abundance and biomass distributionof gelatinous macrozooplankton in relation to physical parameters inHamsilos Bay. Gelatinous macrozooplankton samples were collectedmonthly from four stations between July 2015 and June 2016 using aplankton net with a 112 μm mesh size and a 50 cm diameter mouthopening by vertical hauls. Four gelatinous macrozooplankton specieswere identified: Aurelia aurita (Linnaeus, 1758); Mnemiopsis leidyi A.Agassiz, 1865; Beroe ovata Bruguière, 1789; and, Pleurobrachia pileus(O.F. Müller, 1776). The maximum mean abundance of gelatinousmacrozooplankton was recorded in August 2015 (24.58 ind. m-2),whereas the maximum mean biomass was recorded in April 2016(147.79 g m-2) from four sampling stations. The abundance andbiomass of gelatinous macrozooplankton increased in the summer andspring. M. leidyi and P. pileus were primarily responsible for theincrease in total gelatinous macrozooplankton abundance in thesummer, whereas A. aurita and B. ovata were primarily responsiblefor the increase in total abundance in the spring and autumn. Theabundance and biomass of M. leidyi were positively correlated withtemperature and negatively correlated with dissolved oxygen.

Güney Karadeniz’in Hamsilos Koyu’nda Jelimsi Makrozooplanktonun Mevsimsel Dağılımı

Bu çalışmada, jelimsi makrozooplankton türlerinin Hamsilos Koyu’ndaki mevsimsel bolluk-biomass dağılımları ve fiziksel parametreler ile ilişkisi belirlenmiştir. Jelimsi makrozooplankton örnekleri Temmuz 2015-Haziran 2016 tarihleri arasında belirlenen dört istasyondan aylık olarak 112 μm ağ göz ve 50 cm ağız açıklığına sahip plankton kepçesi ile dikey çekim yöntemi ile toplanmıştır. Çalışmada 4 jelimsi makrozooplankton türü tanımlanmıştır: Aurelia aurita (Linnaeus, 1758); Mnemiopsis leidyi A. Agassiz, 1865; Beroe ovata Bruguière, 1789; and, Pleurobrachia pileus (O.F. Müller, 1776). Dört örnekleme istasyonunun, maksimum ortalama jelimsi makrozooplankton bolluk değeri Ağustos 2015 (24.58 birey m-2) tarihinde kaydedilmiştir. En yüksek ortalama jelimsi makrozooplankton biomass değeri Nisan 2016 tarihinde (147.79 g m2) belirlenmiştir. Jelimsi makrozooplankton bolluk ve biomass değerlerinin yaz ve ilkbaharda artış gösterdiği saptanmıştır. Toplam jelatinimsi makrozooplankton bolluğundaki artıştan M. leidyi ve P. pileus yaz aylarında sorumluyken, A. aurita ve B. ovata ilkbahar ve sonbaharda toplam bolluktaki artışta etkili olmuştur. M. leidyi bolluk ve biomass değerleri sıcaklık ile pozitif ilişki gösterirken çözünmüş oksijen değerleri ile negatif ilişki gösterdiği belirlenmiştir.

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