Twin and triplet forms of Recent benthic foraminifera from the eastern Aegean Sea, Turkish coast

Merıç, Engin; Avşar, Niyazi; Görmüş, Muhittin; Bergin, Fulya

doi:10.2113/50.3.297

Cited by 13 publications

(4 citation statements)

References 9 publications

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“…Species with similar environmental significance were grouped to interpret their distribution patterns. Palaeoecological demands of the species used for estimation are based on published data (Murray 1973(Murray , 2006Sgarrella & Moncharmont-Zei 1993;Meriç et al 2004;Spezzaferri 2004;Hohenegger 2005).…”

Section: Foraminifera and Calcareous Nannofossilsmentioning

confidence: 99%

Effects of spirulina in arsenic poisoning in the Black Bengal goat

Ghosh¹,

Awal²,

Khan³

et al. 2014

Turk J Vet Anim Sci

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the uplift of the CAP margins started (Yildirim et al. 2011;Cosentino et al. 2012;Schildgen et al. 2012). Here we describe the type section of the Tuğlu Formation, a sequence exceptionally rich in fossils. The section has been sampled for micropalaeontological (ostracods, foraminifera, pollen, Characeae), palaeontological (molluscs, small mammals, fish remains), environmental magnetism, and stable carbon and oxygen isotope analyses (on ostracods and bulk sediment samples) as well as strontium isotope analyses (on ostracods and foraminifera) and major elements composition of the sediments. Through a highly multidisciplinary approach, we document the Abstract: The Çankırı Basin, located in the northern part of the Central Anatolian Plateau, is a large Tertiary basin where thick Miocene to Quaternary continental sediments overlay the Cretaceous-Tertiary units. This investigation focuses on the Tuğlu Formation, an Upper Miocene succession mainly composed of dark grey silty and organic rich clays. The type section of Tuğlu has been sampled for an array of multidisciplinary analyses. The palaeontological proxies included ostracod, foraminifer, nannoplankton, pollen, molluscs, charophytes, small mammal assemblages, fish, and crab remains. The abiotic parameters studied were: palaeomagnetism and environmental magnetism, stable carbon and oxygen isotope ratios (on ostracods and bulk sediment samples), strontium isotope ratios (on ostracods and foraminifera), and major elemental composition of the sediments. All analysed proxies point to a continental setting characterised by permanent water bodies affected by strong salinity oscillations. A shallow saline lake developed in a permanent freshwater lake. Barren layers, potentially linked to a short subaerial exposure, mark the end of the saline lake and the transition to a fluvial environment. Geochemical analysis confirms aridity-humidity oscillations as recorded by the micropalaeontological proxies. Analysis of small mammal assemblages refined the chronology of the Tuğlu Formation, with the onset of the deposition at the base of the mammal zone MN9 (around 11 Ma) and continuous deposition until the MN11 zone (around 8 Ma). The stable oxygen isotope records from the Tuğlu section point to Miocene δ 18 O water values consistent with subdued topography where no prominent mountain belts were yet developed at the northern plateau margin. If correct, this suggests that at least until the end of the deposition of the Tuğlu Formation, the Çankırı Basin did not yet experience rain shadow conditions, and the regional surface uplift of the area most likely occurred after 8 Ma.

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Section: Foraminifera and Calcareous Nannofossilsmentioning

confidence: 99%

Effects of spirulina in arsenic poisoning in the Black Bengal goat

Ghosh¹,

Awal²,

Khan³

et al. 2014

Turk J Vet Anim Sci

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“…Morphological irregularities such as distorted growth, twin tests and merged tests in some modern and extinct larger and smaller benthic foraminifera are considered to develop by the influence of a high stressed environment (Hallock et al, 1986;Toler and Hallock, 1998;Stouff et al, 1999a,b;Hallock and Talge, 1994;Meric et al, 2001Meric et al, , 2004. Developments of morphological variations, ecophenotypic variants and test irregularities though less common in planktonic foraminifera, are explained by similar cause (Nash, 1981;Boltovskoy, 1982;Garstel et al, 1986;Koutsoukos, 1996;Coccioni and Luciani, 2006).…”

Section: Discussionmentioning

confidence: 99%

Morphogroups and small sized tests in Pseudotextularia elegans (Rzehak) from the Late Maastrichtian succession of Meghalaya, India as indicators of biotic response to paleoenvironmental stress

Mukhopadhyay

2012

Journal of Asian Earth Sciences

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“…Οι τύποι δυσμορφίας έχουν μια μεγάλη ποικιλία, από μικρές ανωμαλίες όπως η μείωση στο μέγεθος των θαλάμων, έως πολύ σημαντικές όπως οι πολύπλοκες μορφές όπου η μορφολογική ανωμαλία δεν μπορεί εύκολα να εξηγηθεί. Πολλές μελέτες έχουν εστιάσει στις μορφολογικές διαφοροποιήσεις απολιθωμένων και σύγχρονων κελυφών, σε απόκριση μιας σειράς περιβαλλοντικών επιρροών όπως η πολυμορφία εξαιτίας του επιφυτικού τρόπου ζωής, διαφοροποιήσεις στην αλμυρότητα, την οξυγόνωση, τη θερμοκρασία, το pH, τα επίπεδα θρεπτικών συστατικών και/ή στην ανθρωπογενή δραστηριότητα (π.χ., Alve, 1991Alve, , 1995Almogi-Labin et al, 1992;Yanko et al, 1994Yanko et al, , 1998Geslin, 1999;Stouff et al, 1999b;Samir, 2000;Samir & El-Din, 2001;Geslin et al, 2002;Elberling et al, 2003;Meriç et al, 2004Meriç et al, , 2005Ballent & Carignano, 2008). Σα παράκτια οικοσυστήματα είναι ιδιαίτερα ευάλωτα στις αλλαγές του επιπέδου της στάθμης της θάλασσας, όπως έχει καταγραφεί και από τα βενθονικά τρηματοφόρα που έχουν διατηρηθεί και μελετηθεί στις ιζηματογενείς ακολουθίες.…”

Section: β δειγματοληψία επιφανειακών ιζημάτων πυθμένα μαρτίου 2010 κόλπου βραυρώναςunclassified

“…Οι μορφολογικές διαφοροποιήσεις των κελυφών των βενθονικών τρηματοφόρων έχουν παρατηρηθεί σε περιοχές που παρουσιάζουν υψηλή περιβαλλοντική πίεση (stress), η οποία είναι αποτέλεσμα ανθρωπογενούς ρύπανσης και/ή φυσικών αιτιών Geslin et al, 2000Geslin et al, , 2002Stouff et al, 1999b) Οι ανωμαλίες έχουν καταγραφεί σε ένα εύρος σύγχρονων περιβαλλόντων της Μεσογείου με περιβαλλοντική πίεση και φαίνεται πως αυξάνονται σε ιδιαίτερα ρυπασμένες περιοχές, εξαιτίας υψηλών συγκεντρώσεων βαρέων μετάλλων ή οργανικών συγκεντρώσεων (π.χ., Alve, 1991;Coccioni et al, 1997;Yanko et al, 1994Yanko et al, , 1998Samir, 2000;Samir & El-Din, 2001;Burone, 2002;Meriç et al, 2004;Romano et al, 2008;Debenay et al, 2009). Ωστόσο, οι Geslin et al (2002) κατέγραψαν πως οι μορφολογικές διαφοροποιήσεις των κελυφών δεν οφείλονται αποκλειστικά στη ρύπανση, αλλά και σε πλήθος άλλων διαδικασιών, όπως οι αλλαγές της αλμυρότητας (π.χ., Almogi- Labin et al, 1992;Geslin et al, 2002) ή η περιοδική ανοξικότητα του περιβάλλοντος (Stouff et al, 1998(Stouff et al, , 1999bLe Cadre et al, 2003).…”

Section: μορφολογικές διαφοροποιήσεις που βρέθηκαν στα τρηματοφόρα των πυρήνων ιζήματοςunclassified

Τα Βενθονικά Τρηματοφόρα Ως Δείκτες Περιβαλλοντικής Υγείας Των Ολοκαινικών Παράκτιων Οικοσυστημάτων

Koukousioura¹

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Τhe present thesis deals with the study of benthic foraminiferal composition of bottom sediments and Holocene borehole sedimentary successions, from three coastal plains of the north (Thermaikos gulf and Thrace coasts) and central (south Evoikos gulf) Aegean Sea. Studied areas were chosen due to their geographical location, their physicogeographical features, the kind of each biotope and the associated natural environmental conditions and anthropogenic impact from Neolithic times until today.Concerning the systematic taxonomy, 136 benthic foraminiferal species were determined from both modern and Holocene Aegean ecosystems, and species richness, diversity and several micropaleontological indices have been calculated.The environmental health indices developed/used, in this study, are the following: a) Α index: Biometric measurements were performed on Ammonia species tests distinguishing them in two size categories: large (L, large, >0.5 mm) and small (S, small, <0.5 mm) tests. The use of the ratio between large (L) and small (S) Ammonia tests, is established as: A=L/(S+L)*100, as a size standard of Ammonia species. The reduction in salinity values leads to the dominance of the more lobate type A. tepida that replaces the compact type of A. beccarii in the assemblages, combined also with the reduction in test size. b) ΑΕΙ index: Low values of Ammonia-Elphidium index (ΑΕΙ; Sen Gupta et al., 1996) certify environmental stability. c) FAI and FMI indices: High values of the Foraminiferal Abnormality Index and Foraminiferal Monitoring Index (FAI and FMI;Coccioni et al., 2003Coccioni et al., , 2005, in the present thesis, are related to abrupt and intense natural environmental changes and particularly to salinity fluctuations.Modern benthic foraminiferal assemblages of central and north Aegean Sea are characterized by high diversity, and the presence of the invasive lessepsian species Planogypsina acervalis, Sorites orbiculus, Amphistegina lobifera and Cymbaloporetta plana. These modern faunas present clear seasonal and geographical discrimination. The main factor effecting benthic foraminiferal faunal composition in Aegean Sea is proven to be the geographical distribution (mainly latitude and temperature).Three different modern environments were standarized with certain characteristics: closed lagoon environment (Lafrouda Thrace), open lagoon environment (Vravron Attica), and coastal environment (Kitros and Avdira coasts).

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Twin and triplet forms of Recent benthic foraminifera from the eastern Aegean Sea, Turkish coast

Cited by 13 publications

References 9 publications

Effects of spirulina in arsenic poisoning in the Black Bengal goat

Effects of spirulina in arsenic poisoning in the Black Bengal goat

Morphogroups and small sized tests in Pseudotextularia elegans (Rzehak) from the Late Maastrichtian succession of Meghalaya, India as indicators of biotic response to paleoenvironmental stress

Τα Βενθονικά Τρηματοφόρα Ως Δείκτες Περιβαλλοντικής Υγείας Των Ολοκαινικών Παράκτιων Οικοσυστημάτων

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