Dataset Information

A dataset of modern and fossil distribution of coccolithophore species Florisphaera profunda in the world?s ocean.

ABSTRACT: We compiled modern and fossil relative abundance of coccolithophore species Florisphaera profunda from published and unpublished datasets, along with ocean environmental variable data from satellite remote sensing and physical measurements. The database includes relative abundances of F. profunda in sediment trap (n?=?26) and core-top (n?=?1258), and sediment core samples (n?=?104). Downcore data covers the Last Glacial Maximum (n?=?94, 24-19?ka) or the Mid-to-Late Holocene (n?=?77, <6?ka). This database allows studying modern and past biogeography of F. profunda as a response to changing ocean and climate conditions, "Quantitative reconstruction of primary productivity in low latitudes during the last glacial maximum and the mid-to-late Holocene from a global Florisphaera. profunda calibration dataset" (Hernández-Almeida et al., 2018).

SUBMITTER: Hernandez-Almeida I

PROVIDER: S-EPMC6362864 | biostudies-other | 2019 Feb

REPOSITORIES: biostudies-other

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A dataset of modern and fossil distribution of coccolithophore species Florisphaera profunda in the world׳s ocean.

Hernández-Almeida I I Ausín B B Saavedra-Pellitero M M Baumann K-H KH Stoll H M HM

Data in brief 20190107

We compiled modern and fossil relative abundance of coccolithophore species Florisphaera profunda from published and unpublished datasets, along with ocean environmental variable data from satellite remote sensing and physical measurements. The database includes relative abundances of F. profunda in sediment trap (n = 26) and core-top (n = 1258), and sediment core samples (n = 104). Downcore data covers the Last Glacial Maximum (n = 94, 24-19 ka) or the ...[more]

PMID: 30766902

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Project description:Understanding the evolution of scleractinian corals on geological timescales is key to predict how modern reef ecosystems will react to changing environmental conditions in the future. Important to such efforts has been the development of several skeleton-based criteria to distinguish between the two major ecological groups of scleractinians: zooxanthellates, which live in symbiosis with dinoflagellate algae, and azooxanthellates, which lack endosymbiotic dinoflagellates. Existing criteria are based on overall skeletal morphology and bio/geo-chemical indicators-none of them being particularly robust. Here we explore another skeletal feature, namely fine-scale growth banding, which differs between these two groups of corals. Using various ultra-structural imaging techniques (e.g., TEM, SEM, and NanoSIMS) we have characterized skeletal growth increments, composed of doublets of optically light and dark bands, in a broad selection of extant symbiotic and asymbiotic corals. Skeletons of zooxanthellate corals are characterized by regular growth banding, whereas in skeletons of azooxanthellate corals the growth banding is irregular. Importantly, the regularity of growth bands can be easily quantified with a coefficient of variation obtained by measuring bandwidths on SEM images of polished and etched skeletal surfaces of septa and/or walls. We find that this coefficient of variation (lower values indicate higher regularity) ranges from ~40 to ~90% in azooxanthellate corals and from ~5 to ~15% in symbiotic species. With more than 90% (28 out of 31) of the studied corals conforming to this microstructural criterion, it represents an easy and robust method to discriminate between zooxanthellate and azooxanthellate corals. This microstructural criterion has been applied to the exceptionally preserved skeleton of the Triassic (Norian, ca. 215 Ma) scleractinian Volzeia sp., which contains the first example of regular, fine-scale banding of thickening deposits in a fossil coral of this age. The regularity of its growth banding strongly suggests that the coral was symbiotic with zooxanthellates.

Dataset Information

A dataset of modern and fossil distribution of coccolithophore species Florisphaera profunda in the world?s ocean.

Publications

A dataset of modern and fossil distribution of coccolithophore species <i>Florisphaera profunda</i> in the world׳s ocean.

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