Browsing by Author "Uzar S."

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    Dinoflagellate cyst assemblages in the surface sediments from Izmir bay, Aegean sea, Eastern Mediterranean
    (2010) Uzar S.; Aydin H.; Minareci E.
    The present study was conducted on dinoflagellate cyst assemblages from Izmir Bay, Aegean Sea subject to high human impact. Sediment cores were taken from twelve stations. Twenty-eight dinoflagellate cyst types, representing nine genera, were identified. The most common cysts were those of Lingulodinium machaerophorum, Polykrikos kofoidii, Quinquecuspis concreta and Dubridinium caperatum. Potentially toxic species were widely distributed in the study area. This finding is also important to know the seed-bank areas in the Bay of Izmir. © 2010 Academic Journals.
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    Distribution and abundance of modern dinoflagellate cysts from Marmara, Aegean and Eastern Seas of Turkey
    (Triveni Enterprises, 2014) Aydin H.; Uzar S.
    Twenty-one surface sediment samples were collected from coastal areas of Turkey to determine horizontal distribution and abundance of the cysts. A total of 40 dinoflagellate cyst types were identified and recorded in the range of 34 and 31532 cyst g-1 d.wt. in the sediments. The concentration of Lingulodinium machaerophorum, Polykrikos kofoidii, Quinquecuspis concreta, Dubridinium caperatum and Spiniferites bulloideus cysts dominated over other species. Although cysts of potentially toxic species of Alexandrium affine type and A. catenella/tamarense complex were found only in Izmir Bay. A. minutum type, Lingulodinium machaerophorum and Operculodinium centrocarpum were observed in the surface sediments of Marmara Sea and Fethiye Bay. The present study provides a database on the distribution and composition of dinoflagellate cysts in the Eastern Mediterranean sea coastal waters of Turkey where modern dinoflagellate cysts have been little studied. © Triveni Enterprises, Lucknow (India).
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    Dinoflagellate cyst assemblages in surface sediments from Homa Lagoon (Izmir Bay, eastern Aegean Sea, the Mediterranean)
    (Parlar Scientific Publications, 2014) Aydin H.; Yürür E.E.; Uzar S.
    The occurrence and abundance of dinoflagellate cysts was investigated for the first time in Homa Lagoon, one of the most important lagoons of Aegean Coast of Turkey. Twelve cyst morphotypes were identified and cyst abundance was ranged between 15 and 71 cyst g-1 dry weight sediment in the study area. Dinoflagellate cyst assemblages were mainly dominated by cyst of Alexandrium minutum, Spiniferites delicatus, Spiniferites bulloideus. Sediment types were mainly clay and silty sand. Dinoflagellate cysts were particularly distributed in the clay and silty sediment. © by PSP.
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    Modern dinoflagellate cyst assemblages of aliağa and nemrut bay: Influence of industrial pollution; [Endüstriyel kirliliğin etkisindeki aliağa ve nemrut körfezi modern dinoflagellat kist topluluğu]
    (Central Fisheries Research Inst, 2015) Aydın H.; Yürür E.E.; Uzar S.; Küçüksezgin F.
    The spatial distribution of modern dinoflagellate cysts was studied, with the purpose of understanding the impact from industrial pollution and sediment characteristics. Eight surface sediment samples were collected to analysis of the spatial distribution of dinoflagellate cysts from two industrially polluted areas: Aliağa and Nemrut Bay (Eastern Mediterranean). A total of 42 dinoflagellate cyst morphotype were identified and total cyst abundance ranged between 11 and 2543 cyst g-1 dry weight sediment at sampling points. The cyst assemblages were represented by cyst of Gymnodinium nolleri, Alexandrium affine type and Lingulodiniumma chaerophorum. The higher cyst concentration was recorded at mostly Aliağa Bay stations however the higher cyst diversity was found at Nemrut Bay stations. Total cyst concentration and autotrophic cyst concentration indicated metal pollution in the sampling areas whereas total number of cysts had no correlation with any metal levels in the sediment except Cr. The distribution of dinoflagellate cysts also showed correlation with sediment structure in Aliağa and Nemrut Bay. © Published by Central Fisheries Research Institute (CFRI) Trabzon, Turkey.
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    Relationship between the dinoflagellate cyst Spiniferites pachydermus and Gonyaulax ellegaardiae sp. nov. from Izmir Bay, Turkey, and molecular characterization
    (2015) Mertens K.N.; Aydin H.; Uzar S.; Takano Y.; Yamaguchi A.; Matsuoka K.
    Here, we established the cyst-motile stage relation-ship for Spiniferites pachydermus through incubation of cysts with a characteristically microreticulate/perforate surface isolated from Izmir Bay in the eastern Aegean Sea of the eastern Mediterranean. The morphology of the motile stage was similar to Gonyaulax spinifera but had a different size, overhang, displacement and reticulations. Based on the distinct morphology of the cyst and morphological differences in motile cells, we assigned S. pachydermus from Izmir Bay to the new species Gonyaulax ellegaardiae. We elucidate the phylogenetic relationship of G. ellegaardiae through large and small subunit ribosomal DNA and show that it forms a clade with other species that belong to the G. spinifera complex. © 2015 Phycological Society of America.
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    Impact of industrial pollution on recent dinoflagellate cysts in Izmir Bay (Eastern Aegean)
    (Elsevier Ltd, 2015) Aydin H.; Yürür E.E.; Uzar S.; Küçüksezgin F.
    The spatial distribution of dinoflagellate cysts was studied to understand the impact of industrial pollution on the surface sediment of Izmir Bay, Turkey. Forty two dinoflagellate cyst morphotypes belonging to 12 genera were identified and qualified at 12 sampling points. The cyst of Gymnodinium nolleri dominated the bay and had the highest abundance in most of the stations, following Spiniferites bulloideus and Lingulodinium machaerophorum. The highest cyst concentration was recorded in the inner part of the bay. Cyst concentration ranged between 384 and 9944cystg-1 dry weight of sediment in the sampling area. Sediment metal concentrations were determined. Heavy metal levels in Izmir Inner Bay were higher than the Middle and Outer Bay. L. machaerophorum, Dubridinium caperatum and Polykrikos kofoidii showed significant positive correlation with some metals (Cd, Pb, Cu, Zn) and organic carbon content. However, there was no significant correlation between dinoflagellate cyst abundance and sediment type. © 2015 Elsevier Ltd.
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    Dinoflagellate cyst assemblages in surface sediments of southwestern black sea and Çanakkale strait (dardanelles)
    (Parlar Scientific Publications, 2015) Aydin H.; Balci M.; Uzar S.; Balkis N.
    In order to document the distribution of dinoflagellate cyst assemblages, eight surface sediment samples were collected in surface sediments from southwestern Black Sea and Çanakkale Strait. A total of 25 cyst types and 1 unknown cyst type were identified. Samples displays low total cyst concentrations with values ranging from 8 to 346 cyst g-1 dry weight sediment. Autotrophic dinoflagellates highly and significantly contributes (p<0.01) to the total cyst concentration. Lingulodinium machaerophorum, cyst type of Al-exandrium minutum and Spiniferites bulloideus were dominant at the sampling points. Higher cyst concentration and diversity observed at stations in Black Sea could be linked to the type of sediment. Small-sized sediment (sand-silt) were mostly dominant at the Black Sea stations compare to the more sandy type sediment of Çanakkale Strait. Present study provides the first modern dinoflagellate cyst records from surface sediments of southwestern Black Sea and Çanakkale Strait. © by PSP.
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    The dinoflagellate cyst genera Achomosphaera Evitt 1963 and Spiniferites Mantell 1850 in Pliocene to modern sediments: a summary of round table discussions
    (Taylor and Francis Inc., 2018) Mertens K.N.; Van Nieuwenhove N.; Gurdebeke P.R.; Aydin H.; Bogus K.; Bringué M.; Dale B.; De Schepper S.; de Vernal A.; Ellegaard M.; Grothe A.; Gu H.; Head M.J.; Heikkilä M.; Limoges A.; Londeix L.; Louwye S.; Marret F.; Masure E.; Matsuoka K.; Mudie P.J.; Penaud A.; Pospelova V.; Price A.M.; Ribeiro S.; Rochon A.; Sangiorgi F.; Schreck M.; Torres V.; Uzar S.; Versteegh G.J.M.; Warny S.; Zonneveld K.
    We present a summary of two round-table discussions held during two subsequent workshops in Montreal (Canada) on 16 April 2014 and Ostend (Belgium) on 8 July 2015. Five species of the genus Achomosphaera Evitt 1963 and 33 of the genus Spiniferites Mantell 1850 emend. Sarjeant 1970 occuring in Pliocene to modern sediments are listed and briefly described along with remarks made by workshop participants. In addition, several holotypes and topotypes are reillustrated. Three species previously assigned to Spiniferites are here considered/accepted as belonging to other genera: Impagidinium inaequalis (Wall and Dale in Wall et al. 1973) Londeix et al. 2009, Spiniferites? rubinus (Rossignol 1962 ex Rossignol 1964) Sarjeant 1970, and Thalassiphora balcanica Balteş 1971. This summary forms the basis for a set of papers that follows, where points raised during the workshops are explored in greater detail. © 2018, © 2018 The Author(s). Published by AASP–The Palynological Society.
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    Environmental factors influencing the abundance and spatial distribution of modern dinoflagellate cysts in Izmir Bay (Eastern Mediterranean)
    (Elsevier Ltd, 2024) Aydin H.; Uzar S.; Cingöz E.E.; Küçüksezgin F.; Pospelova V.
    We analyzed surface sediments from 12 stations located in Izmir Bay to determine the impact of anthropogenic pollution on dinoflagellate cysts. Forty-three dinoflagellate cyst taxa and two cyst assemblage zones were identified. Zone 1 is characterized by the dominance of cysts of Gymnodinium nolleri, Selenopemphix nephroides, and Operculodinium centrocarpum from the oligotrophic part of Izmir Bay. Zone 2 is in the highly productive inner part of the bay and is characterized by the high abundances of Lingulodinium machaerophorum, Spiniferites ramosus, cysts of Scrippsiella spp., cysts of Polykrikos spp. and Quinquecuspis concreta. We used multivariate statistical analysis (DCA and CCA) on dinoflagellate cysts and environmental variables to support the identification of Zones 1 and 2. Our analyses also revealed that summer and winter chlorophyll-a as well as elevated nitrate and nitrite concentrations are significant parameters in controlling dinoflagellate cyst distribution in Izmir Bay. © 2024 Elsevier Ltd