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Benthic Foraminiferal Composition from the Brackish-Marine Transition Zone of the Marmara Sea, Turkey (Eastern Mediterranean)

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Abstract

Benthic habitat at the continental shelf area of the Marmara Sea is strongly affected by the confluence of the saline Mediterranean and brackish Black Sea waters. Benthic foraminiferal composition and abundance (undifferentiated living and dead) in 19 surface sediment samples taken from water depths between 15 and 67 m from the northern Marmara shelf was studied as tracers of the Mediterranean and Black Sea water masses in the area. Faunal analysis showed that a distinct change occured at about 40 m water depth. Two main assemblages were identified based on cluster analysis of the quantitative benthic foraminiferal data. They are the Asterigerinata mamilla-Lobatula lobatula-Neoconorbina terquemi assemblage (Shallower assemblage) at 20–38 m water depth and Brizalina spathulata-Cassidulina carinata-Bulimina aculeata assemblage (Deeper assemblage) distributed at 43–67 m. Comparison between the depth distribution of representative species and basin-averaged salinity gradient clearly shows that faunal shift follows the hydrological boundary.

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Acknowledgements

The author wishes to thank the scientists, technicians, captains, and crews on board the TCG Çubuklu of the Department of Navigation, Hydrography and Oceanography for their help during the collection of sediment samples. Ş. Bedri Alpar edited the English of final text. This research was supported by the Research Foundation of İstanbul University (Project no: BYP-4133).

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  1. Institute of Marine Sciences and Management, İstanbul University, Vefa, 34134, İstanbul, Turkey

    Elmas Kırcı-Elmas

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Correspondence to Elmas Kırcı-Elmas.

Appendix

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Table 4 Numbers of Specimens in Each Sample for ˃125 μm Fraction
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Kırcı-Elmas, E. Benthic Foraminiferal Composition from the Brackish-Marine Transition Zone of the Marmara Sea, Turkey (Eastern Mediterranean). Thalassas 34, 421–436 (2018). https://doi.org/10.1007/s41208-018-0090-1

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