Dataset Information

Quantitative data on latest-quaternary benthic foraminiferal assemblages in the South Evoikos Gulf semi-enclosed basin (central Aegean, Greece).

ABSTRACT: We herein present an original high-resolution dataset on the Late Pleistocene to Holocene (>15.17 ka BP) benthic foraminiferal record of two continuous sediment cores (DEH 5 and DEH 1), drilled from the shallow (max. depth ∼75 m) semi-enclosed basin of South Evoikos Gulf (central Aegean, Greece). Owing to its particular configuration, this marginal setting has been heavily affected by the latest-glacial to modern-interglacial sea-level and climate oscillations that left clear imprints on the benthic foraminiferal community. Our data comprise quantitative information of the downcore faunal distribution (raw species counts and relative abundances), diversity measurements, simplified datasets used for clustering analysis and calibrated age spans. This material can be efficiently utilized in any comparative or synthetic future study on the reconstruction of the latest-Quaternary palaeoceanographic (palaeobathymetric, sea-level) and palaeoenvironmental evolution of the Mediterranean shelf. The present data article is associated with the research article "Impact of latest-glacial to Holocene sea-level oscillations on central Aegean shelf ecosystems: A benthic foraminiferal palaeoenvironmental assessment of South Evoikos Gulf, Greece" by Louvari et al. (2019).

SUBMITTER: Louvari MA

PROVIDER: S-EPMC6811876 | biostudies-other | 2019 Oct

REPOSITORIES: biostudies-other

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Quantitative data on latest-quaternary benthic foraminiferal assemblages in the South Evoikos Gulf semi-enclosed basin (central Aegean, Greece).

Louvari Markella Asimina MA Drinia Hara H Kontakiotis George G Di Bella Letizia L Antonarakou Assimina A Anastasakis George G

Data in brief 20190919

We herein present an original high-resolution dataset on the Late Pleistocene to Holocene (>15.17 ka BP) benthic foraminiferal record of two continuous sediment cores (DEH 5 and DEH 1), drilled from the shallow (max. depth ∼75 m) semi-enclosed basin of South Evoikos Gulf (central Aegean, Greece). Owing to its particular configuration, this marginal setting has been heavily affected by the latest-glacial to modern-interglacial sea-level and climate oscillations that left clear imprints on the ben ...[more]

PMID: 31667300

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Project description:The Toarcian Oceanic Anoxic Event (TOAE; Early Jurassic, ca. 182 Ma ago) represents one of the major environmental disturbances of the Mesozoic and is associated with global warming, widespread anoxia, and a severe perturbation of the global carbon cycle. Warming-related dysoxia-anoxia has long been considered the main cause of elevated marine extinction rates, although extinctions have been recorded also in environments without evidence for deoxygenation. We addressed the role of warming and disturbance of the carbon cycle in an oxygenated habitat in the Iberian Basin, Spain, by correlating high resolution quantitative faunal occurrences of early Toarcian benthic marine invertebrates with geochemical proxy data (δ18O and δ13C). We find that temperature, as derived from the δ18O record of shells, is significantly correlated with taxonomic and functional diversity and ecological composition, whereas we find no evidence to link carbon cycle variations to the faunal patterns. The local faunal assemblages before and after the TOAE are taxonomically and ecologically distinct. Most ecological change occurred at the onset of the TOAE, synchronous with an increase in water temperatures, and involved declines in multiple diversity metrics, abundance, and biomass. The TOAE interval experienced a complete turnover of brachiopods and a predominance of opportunistic species, which underscores the generality of this pattern recorded elsewhere in the western Tethys Ocean. Ecological instability during the TOAE is indicated by distinct fluctuations in diversity and in the relative abundance of individual modes of life. Local recovery to ecologically stable and diverse post-TOAE faunal assemblages occurred rapidly at the end of the TOAE, synchronous with decreasing water temperatures. Because oxygen-depleted conditions prevailed in many other regions during the TOAE, this study demonstrates that multiple mechanisms can be operating simultaneously with different relative contributions in different parts of the ocean.

Dataset Information

Quantitative data on latest-quaternary benthic foraminiferal assemblages in the South Evoikos Gulf semi-enclosed basin (central Aegean, Greece).

Publications

Quantitative data on latest-quaternary benthic foraminiferal assemblages in the South Evoikos Gulf semi-enclosed basin (central Aegean, Greece).

Similar Datasets

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