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Publication . Article . Preprint . 2012

Environmental variations in a semi-enclosed embayment (Amvrakikos Gulf, Greece) – reconstructions based on benthic foraminifera abundance and lipid biomarker pattern

Sebastian Naeher; Maria Geraga; George Papatheodorou; George Ferentinos; H. Kaberi; Carsten J. Schubert;
Open Access
Published: 11 Dec 2012 Journal: Biogeosciences, volume 9, pages 5,081-5,094 (eissn: 1726-4189, Copyright policy )
Publisher: Copernicus GmbH
Country: Switzerland

The evolution of environmental changes during the last decades and the impact on the living biomass in the western part of Amvrakikos Gulf was investigated using abundances and species distributions of benthic foraminifera and lipid biomarker concentrations. These proxies indicated that the gulf has markedly changed due to eutrophication. Eutrophication has led to a higher productivity, a higher bacterial biomass, shifts towards opportunistic and tolerant benthic foraminifera species (e.g. Bulimina elongata, Nonionella turgida, Textularia agglutinans, Ammonia tepida) and a lower benthic species density. Close to the Preveza Strait (connection between the gulf and the Ionian Sea), the benthic assemblages were more diversified under more oxygenated conditions. Sea grass meadows largely contributed to the organic matter at this sampling site. The occurrence of isorenieratane, chlorobactane and lycopane supported by oxygen monitoring data indicated that anoxic (and partly euxinic) conditions prevailed seasonally throughout the western part of the gulf with more severe oxygen depletion towards the east. Increased surface water temperatures have led to a higher stratification, which reduced oxygen resupply to bottom waters. Altogether, these developments led to mass mortality events and ecosystem decline in Amvrakikos Gulf.

Biogeosciences, 9 (12)


Subjects by Vocabulary

Microsoft Academic Graph classification: Anoxic waters Environmental science Eutrophication Oceanography Benthic zone Foraminifera biology.organism_classification biology Productivity (ecology) Ecology Biomass (ecology) Abundance (ecology) Ammonia tepida

Medical Subject Headings: geographic locations

Library of Congress Subject Headings: lcsh:Ecology lcsh:QH540-549.5 lcsh:Life lcsh:QH501-531 lcsh:Geology lcsh:QE1-996.5


Earth-Surface Processes, Ecology, Evolution, Behavior and Systematics

69 references, page 1 of 7

Airoldi, L. and Beck, M. W.: Loss, status and trends for coastal marine habitats of Europe, Oceanogr. Mar. Biol., 45, 345-405, 2007.

Almogi-Labin, A., Perelis-Grossovicz, L., and Raab, M.: Living ammonia from a hypersaline inland pool, Dead Sea area, Israel, J. Foramin. Res., 22, 257-266, 1992.

Anastasakis, G., Piper, D. J. W., and Tziavos, C.: Sedimentological response to neotectonics and sea-level change in a deltafed, complex graben: Gulf of Amvrakikos, western Greece, Mar. Geol., 236, 27-44, 2007. [OpenAIRE]

Angel, D. L., Verghese, S., Lee, J. J., Saleh, A. M., Zuber, D., Lindell, D., and Symons, A.: Impact of a net cage fish farm on the distribution of benthic foraminifera in the Northern Gulf of Eilat (Aqaba, Red Sea), J. Foramin. Res., 30, 54-65, 2000.

Appleby, P. G. and Oldfield, F.: The calculation of lead-210 dates assuming a constant rate of supply of unsupported 210Pb to the sediment, Catena, 5, 1-8, 1978.

Barmawidjaja, D. M., van der Zwaan, G. J., Jorissen, F. J., and Puskaric, S.: 150 years of eutrophication in the northern Adriatic Sea - Evidence from a benthic foraminiferal record, Mar. Geol., 122, 367-384, 1995. [OpenAIRE]

Bechtel, A. and Schubert, C. J.: A biogeochemical study of sediments from the eutrophic Lake Lugano and the oligotrophic Lake Brienz, Switzerland, Org. Geochem., 40, 1100-1114, 2009.

Blackwelder, P., Hood, T., Alvarez-Zarikian, C., Nelsen, T. A., and McKee, B.: Benthic foraminifera from the NECOP study area impacted by the Mississippi River plume and seasonal hypoxia, Quatern. Int., 31, 19-36, 1996. [OpenAIRE]

Brocks, J. J. and Summons, R. E.: Sedimentary hydrocarbons, biomarkers for early life, in: Treatise in Geochemistry, edited by: Holland, H. D. and Turekian, K., Biogeochemistry, 8, 65-115, Elsevier, Oxford, 2003.

Buzas, M. A. and Gibson, T. G.: Species diversity: Benthonic foraminifera in western North Atlantic, Science, 163, 72-75, 1969. [OpenAIRE]

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Funded by
In situ monitoring of oxygen depletion in hypoxic ecosystems of coastal and open seas, and land-locked water bodies
  • Funder: European Commission (EC)
  • Project Code: 226213
  • Funding stream: FP7 | SP1 | ENV
Related to Research communities
European Marine Science Marine Environmental Science : In situ monitoring of oxygen depletion in hypoxic ecosystems of coastal and open seas, and land-locked water bodies
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Article . 2012
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