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Abstract

Oithona davisae (Copepoda: Cyclopoida) is reported for the first time from the Marmara Sea and added to the regional

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“…Since 2008 O. davisae periodically contributed up to 99% of total copepod abundance in Sevastopol Bay (Altukhov, Gubanova & Mukhanov, 2014;Svetlichny et al, 2016), similar to domination of O. davisae observed in Tokyo Bay where it contributed about 99% of the total number of copepods during the warm periods in 1980-s (Tsuda & Nemoto, 1988). It was registered later near Romanian (Timofte & Tabarcea, 2012), Bulgarian (Mihneva & Stefanova, 2013) and recently Turkish coasts (Üstün & Terbıyık Kurt, 2016;Yıldız, Feyzioğlu & Besiktepe, 2016) in Büyükçekmece Bay and in the Golden Horn Estuary located in the North-eastern (Doğan & Isinibilir, 2016;Isinibilir, Svetlichny & Hubareva, 2016). Wide dissemination of O. davisae in variable climatic zones and its survival in wide range of temperature from + 6 °C , and even from inconceivable -1.8 °C in the North Sea (Cornils & Wend-Heckmann, 2015) up to+ 28 °C in Pacific (Uye & Sano, 1998) and + 29 °C in the Black Sea , was supposed due to the unique adaptive strategy of this species: flexible metabolism, high survival rate of overwintering fertilized females during long unfavorable cold winter, and emergence of the offsprings originated from these overwintering females in favorable conditions in late spring .…”

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“…It is an invasive species along the west coast of the US (Ferrari and Orsi, 1984) and is established in the Mediterranean (Saiz, Calbet, & Broglio, 2003) and the Black Seas (Mihneva and Stefanova, 2013). Oithona davisae recorded as a new exotic species for the Marmara Sea (Doğan and Isinibilir, 2016) and was also found in the Golden Horn (Isinibilir et al, 2016). O. davisae probably penetrated into the Golden Horn Estuary and Marmara Sea from the Black Sea through the Strait of Istanbul current only several years ago (Isinibilir et al, 2016).…”