Recent Ostracods from Hovgaard and Horseshoe islands (Northwestern Antarctica Peninsula, NW Antarctica)

On the route of the II Turkish Antarctic Expedition (TAE-II) in the NW of the continent of Antarctica, twelve grab sediment samples were been collected from seven different locations at depths of -20 and -60 m between King George and Horseshoe islands in NW Antarctica. The collected samples consist...

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Bibliographic Details
Published in:Türkiye Jeoloji Bülteni / Geological Bulletin of Turkey
Main Authors: NAZİK, Atike, BÜYÜKMERİÇ, Yeşim, KILIÇ, Ali Murat, YÜMÜN, Zeki Ünal
Format: Article in Journal/Newspaper
Language:Turkish
Published: TMMOB Jeoloji Mühendisleri Odası 2022
Subjects:
Kil
Online Access:https://dergipark.org.tr/tr/pub/tjb/issue/65186/1002087
https://doi.org/10.25288/tjb.1002087
Description
Summary:On the route of the II Turkish Antarctic Expedition (TAE-II) in the NW of the continent of Antarctica, twelve grab sediment samples were been collected from seven different locations at depths of -20 and -60 m between King George and Horseshoe islands in NW Antarctica. The collected samples consist of greenish gray silty clay and fine sandy silt, as well as brownish gray sandy silty clay units containing fine gravel grains.In the Hovgaard and Horseshoe islands, six genera and six species of ostracods were identified: Copytus caligula Skogsberg, Austrotrachyleberis antarctica (Neale), Australicythere devexa (Müller), Cativella bensoni Neale, Cytheropteron acuticaudatum Hartmann and Loxoreticulatum fallax (Müller). The species are cryophilic endemic ostracods. When the fossil and current findings are compared, Austrotrachyleberis antarctica, which has been known since the Oligocene, migrated from Antarctica to South America and Cativella bensoni migrated from South America to Antarctica. Antarktika Kıtası’nın kuzeybatısında gerçekleştirilen II. Türk Antarktika Sefereri (TAE-II) rotası üzerinde King George ve Horseshoe adaları arasında, -20 ile -60 m derinliklerde yedi ayrı lokasyondan 12 adet kepçe numunesi alınmıştır. Derlenen örnekler, yeşilimsi gri renkli siltli kil ve ince kumlu silt, kahverengimsi gri renkli, ince çakıl taneleri içeren kumlu siltli kil birimlerinden oluşmaktadır.Hovgaard ve Horseshoe adaları örneklerinde ostrakodlardan altı cins ve altı tür tanımlanmıştır: Copytus caligula Skogsberg, Austrotrachyleberis antarctica (Neale), Australicythere devexa (Müller), Cativella bensoni Neale, Cytheropteron acuticaudatum Hartmann ve Loxoreticulatum fallax (Müller). Bulunan türler kriyofilik endemik ostrakodlardır. Faunal göçleri temsil eden türlerden, Antarktika’dan Güney Amerika’ya göç eden Austrotrachyleberis antarctica ile Güney Amerika’dan Antarktika’ya göç eden Cativella bensoni türlerinin inceleme alanında varlığı ortaya konmuştur.