BENTHIC FORAMINIFERA INDICATE ENVIRONMENTAL STRESS FROM RIVER DISCHARGE TO MARINE ECOSYSTEMS: EXAMPLE FROM THE BLACK SEA

Research Article| January 01, 2017 Benthic Foraminifera Indicate Environmental Stress from River Discharge To Marine Ecosystems: Example from the Black Sea Valentina Yanko-Hombach; Valentina Yanko-Hombach 3 1Odessa I.I. Mechnikov National University, Department of Physical and Marine Geology, 2 Dvoryanskaya Str., Odessa 65082, Ukraine 2Avalon Institute of Applied Science, 976 Elgin Ave., Winnipeg, MB, Canada R3E 1B4 3Correspondence author. E-mail: valyan@onu.edu.ua, valyan@ avalon-institute.org Search for other works by this author on: GSW Google Scholar Tetiana Kondariuk; Tetiana Kondariuk 1Odessa I.I. Mechnikov National University, Department of Physical and Marine Geology, 2 Dvoryanskaya Str., Odessa 65082, Ukraine Search for other works by this author on: GSW Google Scholar Irena Motnenko Irena Motnenko 2Avalon Institute of Applied Science, 976 Elgin Ave., Winnipeg, MB, Canada R3E 1B4 Search for other works by this author on: GSW Google Scholar Author and Article Information Valentina Yanko-Hombach 3 1Odessa I.I. Mechnikov National University, Department of Physical and Marine Geology, 2 Dvoryanskaya Str., Odessa 65082, Ukraine 2Avalon Institute of Applied Science, 976 Elgin Ave., Winnipeg, MB, Canada R3E 1B4 Tetiana Kondariuk 1Odessa I.I. Mechnikov National University, Department of Physical and Marine Geology, 2 Dvoryanskaya Str., Odessa 65082, Ukraine Irena Motnenko 2Avalon Institute of Applied Science, 976 Elgin Ave., Winnipeg, MB, Canada R3E 1B4 3Correspondence author. E-mail: valyan@onu.edu.ua, valyan@ avalon-institute.org Publisher: Cushman Foundation for Foraminiferal Research First Online: 08 Nov 2017 Online Issn: 1943-264X Print Issn: 0096-1191 © 2017, The Cushman Foundation for Foraminiferal Research Journal of Foraminiferal Research (2017) 47 (1): 70–92. https://doi.org/10.2113/gsjfr.47.1.70 Article history First Online: 08 Nov 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Valentina Yanko-Hombach, Tetiana Kondariuk, Irena Motnenko; Benthic Foraminifera Indicate Environmental Stress from River Discharge To Marine Ecosystems: Example from the Black Sea. Journal of Foraminiferal Research 2017;; 47 (1): 70–92. doi: https://doi.org/10.2113/gsjfr.47.1.70 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyJournal of Foraminiferal Research Search Advanced Search Abstract The focus of this research was to investigate how the Danube River discharge influences environmental conditions and benthic ecosystems on the Black Sea shelf using foraminifera to delineate affected areas. Specific goals included: (1) to examine the taxonomic composition, quantitative distributions, and test morphologies in foraminiferal assemblages; (2) to correlate them with environmental (oceanographic, geochemical, sedimentological) parameters; (3) to identify the main factors associated with changes in foraminiferal distributions; and (4) to identify assemblages and species that indicate environmental changes along the gradient from delta front to unaffected shelf.Foraminiferal assemblages revealed the influence on the benthic ecosystem of the discharge of water and sediments enriched with organic and inorganic compounds from the Danube delta. Three foraminiferal assemblages were recognized, indicating strong (assemblage Ammonia tepida), weak (assemblage A. compacta), and undetectable (assemblage A. ammoniformis) deltaic influence as a function of distance from shore. Sites strongly influenced were characterized by lower diversity and species richness as well as dominance by A. tepida and Porosononion subgranosus mediterranicus. These species are tolerant of fluctuations in salinity and sedimentation, and thrive on labile organic carbon produced by abundant phytoplankton fertilized by nutrients in the fluvial discharge. The boundary between strong and weak influence on bottom ecosystems occurs at the 25 m isobath, which coincides with the distal zone of the delta front. The boundary between weak and no influence coincides with the frontal zone of the prodelta. No fluvial influence was detected on the outer shelf.The progression of foraminiferal assemblages, A. tepida to A. compacta to A. ammoniformis, and the increase of polyhaline Lagenida in the assemblages seawards, indicates that organic carbon flux is the dominant factor. Other factors, such as salinity and oxygen depletion, seem to play secondary roles, while the type of substrate likely contributes primarily to the diversity of microhabitats within the benthic ecosystems, with muddy delta front sediments providing fewer microhabitats than mixed mud and molluscan shells found on the outer shelf. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.

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