First report of the planktonic copepod Oithona davisae in the northern Wadden Sea (North Sea): Evidence for recent invasion?

Abstract

In October 2010, specimens of Oithona were taken from the List Tidal Basin in the northern Wadden Sea (North Sea) for a biogeographic study on Oithona similis.

New insights into global biogeography, population structure and natural selection from the genome of the epipelagic copepod Oithona

“…The small size of Oithona (<1 mm) and its subtle morphological species‐specific traits that can only be observed by microscopy (Nishida, Omori, & Tanaka, ) represent a serious difficulty for studies involving a large number of samples. Ribosomal 28S and mitochondrial genes have been successfully used to characterize Oithona species (Cepeda et al., ; Cornils et al., ; Ueda, Yamaguchi, Saitoh, Orui Sakaguchi, & Tachihara, ) but also to identify invasive species (Cornils & Wend‐Heckmann, ). This combination of morphological identification and molecular analyses provides robust molecular resources that can be used as a reference for species identification using molecular analysis‐only approaches including genome‐wide approaches (i.e., metagenomics).…”

First distribution record of the invasive copepod Oithona davisae Ferrari and Orsi, 1984, in the coastal waters of the Aegean Sea

“…However, the presence of the international harbour in the Izmir Bay suggests that the individuals may have been transported by ballast waters from different regions and may have dispersed from the bay to the adjacent stations such as the Karaburun and Ildır coasts. In many studies, it is emphasized that the main route of this species is ballast waters (Cordell, Bollens, Draheim, & Systema, ; Cornils & Wend‐Heckmann, ; Vidjak et al, ; Yıldız et al, ). The invasive O. davisae has successfully settled in transitional ecosystems, such as Lakes Faro and Ganziri and the Golden Horn Estuary (Isinibilir, Svetlichny, & Hubareva, ; Zagami et al, ), and has dominated zooplankton communities with their increasing numbers in certain periods (Zagami et al, ).…”

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“…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 .…”

“…Originally distributed in the west Pacific coastal waters it was considered endemic to the temperate coastal waters of East Asia, particularly in Japan coastal areas (Uchima, 1988;Uye & Sano, 1995). This species was suggested to be transferred with ballast waters of transoceanic ships (Choi, Kimmerer, Smith, Ruiz & Lion, 2005;Kasyan, 2010;Lawrence & Cordell, 2010), and thus invaded different areas of the World Ocean coastal waters: off western USA (Ambler, Cloern & Hutchinson, 1985;, off southern Chile (Hirakawa, 1988), Mediterranean (Saiz, Calbet, Broglio & Mari, 2003) and Northern (Cornils & Wend-Heckmann, 2015) seas.…”