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    Description of Bithynia gonensis sp. nov. (Gastropoda: Bithyniidae) from Gönen Çayı, north-western Türkiye
    (E Schweizerbartsche Verlagsbuchhandlung, 2024) Odabaşı, Deniz Anıl; Odabaşı, Serpil; Ergül, Halim Aytekin; Zilifli, Aytuğ
    This study aims to reveal the freshwater mollusc assemblages from 6 sites sampled along Gonen cayi, a stream which flows into the southern Marmara Sea in north-western Turkiye. The stream was sampled using the multi-habitat sampling method with a hand net. Ten species of freshwater molluscs, most of which are widely distributed in Turkiye, were found in the study area. Among these taxa was an unidentified species of Bithynia, which was only present at 1 site. Its shell and anatomy were compared with other Bithynia species from Turkiye and neighbouring countries and found to differ, which revealed that it is a new species. The discovery of the new species increases the diversity of Bithynia in northern Turkiye to 4 species, and to 11 species for Turkiye. This paper highlights the diversity and endemism of freshwater molluscs in Turkiye and emphasizes the need for further research on the distribution of bithyniid species in the country.
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    Öğe
    Sightings of cetaceans in the Western Antarctic Peninsula during the first joint Turkish Ukrainian Antarctic Research Expedition, 2016
    (2017) Öztürk, Bayram; Tonay, Mehmet Arda; Öz, Melike İdil; Yılmaz, İzzet Noyan; Ergül, Halim Aytekin; Öztürk, Ayaka Amaha
    During the cetacean surveys of the first Turkish Ukrainian Antarctic Research Expedition conducted on 5 8 April 2016 inLemaire Channel, Penola Strait, Flanders Bay, southern Gerlache Strait, and southern Neumayer Channel in the Western AntarcticPeninsula, 74 humpback whales ( Megaptera novaeangliae ) in 24 sightings and 11 Antarctic minke whales ( Balaenoptera bonaerensis) in 6 sightings were recorded. The overall encounter rate (number of sightings/survey effort in nautical miles) was 0.333 (0.266 forhumpback whale, 0.066 for Antarctic minke whale). According to the sighting distribution, the Lemaire Channel and Penola Strait areimportant migration and feeding habitats for whales. Five humpback whales were photo-identified individually by natural features ontheir flukes; one of them had a match in the Antarctic Humpback Whale Catalogue. The matched individual was first recorded on 30August 2007 at Salinas, Ecuador.