Yazar "Ovalis, Panayotis" seçeneğine göre listele

Listeleniyor 1 - 4 / 4
  • Küçük Resim
    Öğe
    Occurrence of Two Non-indigenous Alien Sea Slugs, Bursatella leachii (Blainville, 1817) and Melibe viridis (Kelaart, 1858) (Gastropoda: Heterobranchia), from the Canakkale Strait, Turkish Straits System
    (Institute of Biodiversity and Ecosystem Research - Bulgarian Academy of Sciences, 2021) Özalp, Barış H.; Ovalis, Panayotis; Culha, Mehmet
    This study reports the heterobranch mollusks Bursatella leachii (Blainville, 1817) and Melibe viridis (Kelaart, 1858) for the first time from the Dardanelles (Çanakkale Strait), Turkey. Individuals of these two species were observed in January 2020 on a sandy and seagrass bed of Cymodocea nodosa (Ucria) Ascherson and in groups among the algae Caulerpa racemosa (Forsskål) J. Agardh. Although the Dardanelles is one of the biodiversity hotspots in Turkish Seas and the abundance of marine invertebrates in particular regions is significantly high, the inventory of the sea slugs in the region is limited. This study improves the existing knowledge on the molluscan fauna of the Turkish Straits System, the species abundance in the region and their ecological characteristics. The current finding also represents the northernmost records in an invaded area at the Çanakkale Strait of Aegean Sea.
  • [ X ]
    Öğe
    On the discovery of Crithe cossinea T. Cossignani, 1997, a new marine alien species for the Mediterranean Sea, with additions and remarks on 15 unreported molluscan species from Turkey coast
    (Cahiers De Biologie Marine, 2017) Aslan, Herdem; Ovalis, Panayotis
    The whole molluscan assemblages along the Turkish coasts of the Aegean Sea and the Levantine Sea (Southern Turkish coasts), were studied from 20 stations at depths ranging from 11 m to 69 m, between August and October 2014. This has resulted in new contribution to Mediterranean marine molluscan fauna. Crithe cossinea is a new lessepsian for the Mediterranean Sea, five Gastropoda (Melanella alba, Mangelia callosa, Mangelia tenuicosta, Clathromangelia loiselieri, Raphitoma bicolor) are new records for Turkish Seas, two Gastropoda (Ondina obliqua, Retusa nitidula) are new records for the Aegean Sea while another two Gastropoda (Alvania hispidula, Vexillum hypatiae) are new records for the Turkish coast of the Aegean Sea and four Gastropoda (Cerithiopsis fayalensis, Bela menkhorsti, Raphitoma aequalis, and the alien species Monotygma fulva) are new records for the Turkish coasts of Levantine Sea. Among Bivalvia species, Thyasira alleni is a new record for both seas and Pitar mediterraneus is a new record for the Turkish coasts of Levantine Sea. The present study contributes to molluscan fauna of Turkish waters by the addition of six more species, increasing their number to 1076.
  • [ X ]
    Öğe
    Seasonal Variations and Structure of the Molluscan Assemblage in the Canakkale Strait (Turkey)
    (Inst Zoology, Bas, 2013) Aslan-Cihangir, Herdem; Ovalis, Panayotis
    The molluscan assemblage of the Canakkale Strait (Turkish Strait System) was studied at depths ranging from 10 to 22 m, by means of the van Veen grab seasonally during 2006 and also at 7 stations, that are located in the middle part of the Canakkale Strait, at depths ranging from 40 to 83 m by means of box-core, van Veen grab and dredge during the summer of 2007. A total of 283 species were found in the strait. Krachia cylindrata (Jeffieys, 1885) was newly recorded in the East of the Mediterranean Sea and a total of 5 species [Cerithiopsis scalaris (Locard, 1892), Melanella monterosatoi (Monterosato, 1890), Bela fuscata (Deshayes, 1835), Mangelia melitensis Cachia and Mifsud, 2008 and Cylichnina laevisculpta (Granata-Grillo, 1877)] were newly recorded in the Turkish Seas. Furthermore, 37 mollusc species were newly recorded in the Turkish Strait System and 140 more species were recorded for the first time from the Canakkale Strait. Bittium reticulatum (da Costa, 1778) and Mytilus galloprovincialis Lamarck, 1819, were the most important species, representing 52% of the total 37024 specimens. No seasonal differences were found, while hydrodynamic conditions seem to be the factor controlling Mollusca recruitment in the Canakkale Strait.
  • [ X ]
    Öğe
    Spatial Variation Ecological Quality Assessment of Live and Dead Molluscan Assemblages in the Aegean Sea
    (Korea Inst Ocean Science & Technology-Kiost, 2023) Aslan, Herdem; Ovalis, Panayotis
    For accurate estimation and correct identification of species of EcoQS for macrozoobenthos in MSFD, the distinction between dead and living molluscan specimens is significant. In this study, EcoQS values of Turkish Aegean Sea coasts were calculated separately based on live and dead + live molluscan communities using Shannon-Wiener Indices, Bentix, AMBI, M-AMBI and TUBI biotic indices. A total of 219 mollusks species and 76,170 ind.m(-2) were found but only 57 species and 2227 ind.m(-2) of them were encountered as live and 2 species (Turbonilla sinuosa and Alvania zaraensis) of dead individuals were identified as new records for the Turkish coasts. Stations with rare live molluscan species numbers have lower ecological qualities than the indices made with dead + live. However, in the presence of opportunistic species among dead + living species, the situation is reversed. In this study, we discuss the results of the aggregation of dead molluscan individuals, and the differences and correlations between the indices according to the different molluscan data sets. Thanks to the aggregation of dead molluscan individuals obtained in the sampling area, information about the anthropogenic disturbances in the recent past can be obtained. While there is a correlation between EcoQS of indices of the dead + live mollusk species, this correlation is not found in only living individuals. Also a similarity was found between M-AMBI and TUBI, which used the Shannon-Wiener index in their calculation.