The distribution and coordination of trace elements in Krithe ostracods and their implications for paleothermometry

Branson, Oscar; Redfern, Simon A. T.; Elmore, Aurora C.; Read, Elizabeth; València, S.; Elderfield, Henry

doi:10.1016/j.gca.2017.12.005

Cited by 11 publications

(8 citation statements)

References 44 publications

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“…For example, Mg 2+ in a coral skeletal aragonite was reported to be present in a disordered non-crystalline phase of potential organic affinity (Finch and Allison, 2008). Likewise, a study on ostracods found that Mg 2+ identified in the shell was not incorporated into the calcite lattice of the shell (Branson et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Patterns of Element Incorporation in Calcium Carbonate Biominerals Recapitulate Phylogeny for a Diverse Range of Marine Calcifiers

et al. 2021

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Elemental ratios in biogenic marine calcium carbonates are widely used in geobiology, environmental science, and paleoenvironmental reconstructions. It is generally accepted that the elemental abundance of biogenic marine carbonates reflects a combination of the abundance of that ion in seawater, the physical properties of seawater, the mineralogy of the biomineral, and the pathways and mechanisms of biomineralization. Here we report measurements of a suite of nine elemental ratios (Li/Ca, B/Ca, Na/Ca, Mg/Ca, Zn/Ca, Sr/Ca, Cd/Ca, Ba/Ca, and U/Ca) in 18 species of benthic marine invertebrates spanning a range of biogenic carbonate polymorph mineralogies (low-Mg calcite, high-Mg calcite, aragonite, mixed mineralogy) and of phyla (including Mollusca, Echinodermata, Arthropoda, Annelida, Cnidaria, Chlorophyta, and Rhodophyta) cultured at a single temperature (25°C) and a range of pCO2 treatments (ca. 409, 606, 903, and 2856 ppm). This dataset was used to explore various controls over elemental partitioning in biogenic marine carbonates, including species-level and biomineralization-pathway-level controls, the influence of internal pH regulation compared to external pH changes, and biocalcification responses to changes in seawater carbonate chemistry. The dataset also enables exploration of broad scale phylogenetic patterns of elemental partitioning across calcifying species, exhibiting high phylogenetic signals estimated from both uni- and multivariate analyses of the elemental ratio data (univariate: λ = 0–0.889; multivariate: λ = 0.895–0.99). Comparing partial R2 values returned from non-phylogenetic and phylogenetic regression analyses echo the importance of and show that phylogeny explains the elemental ratio data 1.4–59 times better than mineralogy in five out of nine of the elements analyzed. Therefore, the strong associations between biomineral elemental chemistry and species relatedness suggests mechanistic controls over element incorporation rooted in the evolution of biomineralization mechanisms.

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Section: Introductionmentioning

confidence: 99%

Patterns of Element Incorporation in Calcium Carbonate Biominerals Recapitulate Phylogeny for a Diverse Range of Marine Calcifiers

et al. 2021

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“…By contrast, maximum Mg and Mg/Ca intensities are commonly distributed along the edges of cleaned valves in all specimens investigated. The elemental heterogeinity of the shell has been previously suggested as a potential limitation of this proxy (Branson et al., 2018; Morishita et al., 2007). This pattern reveals an additional shortcoming for the use of incomplete ostracode valves in paleoenvironmental research, as the portion of the valve selected for the analysis may not be representative of the full specimen's Mg and/or Ca concentrations and thus bias the Mg/Ca ratio.…”

Section: Resultsmentioning

confidence: 99%

“…during shell calcification after the disintegration of calcium phosphate granules which transform into small granular structures of calcium carbonate (Keyser & Walter, 2004). EPMA images reveal that uncleaned specimens of both genera and molt stages generally contain more areas with The elemental heterogeinity of the shell has been previously suggested as a potential limitation of this proxy (Branson et al, 2018;Morishita et al, 2007). This pattern reveals an additional shortcoming for the use of incomplete ostracode valves in paleoenvironmental research, as the portion of the valve selected for the analysis may not be representative of the full specimen's Mg and/or Ca concentrations and thus bias the Mg/Ca ratio.…”

Section: Crystallography and Intra-valve Geochemistrymentioning

confidence: 88%

“…Specifically, undesired Mg addition may be associated with three dominant sources: 1) organic matter content, derived from both external contaminants and/or from the organism itself, 2) clay contamination, and 3) diagenesis. Detailed analysis of the coordination chemistry within one Krithe valve suggests that most of its Mg content is indeed associated with its organic framework (Branson et al., 2018). However, because the organic source is not subject to the same thermodynamic relationship thought to govern Mg incorporation into the carbonate mineral, a failure to remove such a source may add biases to paleotemperature reconstructions.…”

Section: Introductionmentioning

confidence: 99%

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Intra‐Valve Elemental Distributions in Arctic Marine Ostracodes: Implications for Mg/Ca and Sr/Ca Paleothermometry

Rodríguez

Doherty

Man

et al. 2021

Geochem Geophys Geosyst

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Reconstructing intermediate and bottom‐water temperature in the Arctic Ocean is key for understanding paleoclimatic phenomena, such as the region's interactions with warm Atlantic waters, stratification, and sea‐ice dynamics. However, benthic proxy archives are sparse throughout the Arctic circle compared to lower latitudes. Trace‐element ratios (E/Ca) derived from ostracodes, a group of bivalved microscopic crustaceans, have shown promise in this regard. Samples for E/Ca measurements typically require rigorous cleaning prior to analysis, and signs of contamination are routinely monitored through the presence of other trace elements such as Al, Fe, and Mn, which are associated with suspected sources of overprinting. However, there has not yet been an intra‐valve investigation of all of these trace elements, which may hinder our ability to effectively identify geochemical overprinting. Here, we present several elemental concentration and E/Ca ratio measurements in two ostracode genera, Krithe and Polycope, extracted from Chukchi Sea sediment samples. We further investigate the intra‐valve distribution of elements within single shells of adult and juvenile specimens using electron probe microanalysis (EPMA). Our findings suggest that brushing and bleach treatments may not be effective for completely eliminating clays from the edges of valves, which can bias paleoclimatologically relevant trace‐element proxies such as Mg/Ca ratios, particularly in the case of incomplete or small samples with low amounts of calcite material. In addition, we report the first trace‐element data from the genus Polycope, which shows potential as a new Arctic paleotemperature archive.

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“…Stable isotopic studies by many researchers have inferred that Krithe is a cooler water genus. Branson & Elderfield [13], used trace elements (Mg and Sr) and Electron Probe Micro Analysis to decipher paleothermometry along with the paleosalinity. The evolution of bottom ocean and the paleowater conditions can be decoded by the shell chemical studies using the genera.…”

Section: Oceanography and Fisheries Open Access Journalmentioning

confidence: 99%

Genus Krithe (Ostracoda) as a Proxy to Decipher Paleoceanography: A Global Review of the Genu

Radhakrishnan

2019

OFOAJ

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Ostracoda genus Krithe as paleo-oceanographic biomarkersBeing benthonic and abundant in ocean sediments (not observed in shallow tropical zone), Ostracoda genus Krithe marks its importance more than any other genera for paleooceanographic studies. Diversification of the genus Krithe is dominant beyond 1000m water depth, in bathyal and abyssal zone [5]. Glacial-interglacial cycles are marked using abundance and diversity of Ostracoda genus Krithe from Eastern Equatorial Pacific [3]. Higher counts of genus Krithe represents a cooler temperature and vice versa. Krithe is common along the Upper Cretaceous region in northern Gulf coastal plain of North America. The nature of the sediments as well as the oxygen concentrations are the reason for the occurrence of the genus to a limited area, which implies on the paleoenvironment [6]. Extensive studies on East China and Yellow seas, wherein about 520 grab samples were collected and examined for the distribution pattern of Krithe and Parakrithe genera focusing mainly on the oceanographic changes [7].The genera were observed to occur in marginal marine conditions, and inner and middle shelf of the East China Sea and absence of the species addresses the lower salinity, higher temperature and coarser nature of the sediments and also the size of the shell varies with water temperature [8], which makes it useful for understanding bottom water chemistry and the temperature history of the ocean.Deeper part of North Atlantic is dominated by diversified species of Krithe and the age determined aiding the microfossil assemblage is Eocene to Oligocene [9]. The significance of the temperature on shell growth and morphometry in taxa

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The distribution and coordination of trace elements in Krithe ostracods and their implications for paleothermometry

Cited by 11 publications

References 44 publications

Patterns of Element Incorporation in Calcium Carbonate Biominerals Recapitulate Phylogeny for a Diverse Range of Marine Calcifiers

Patterns of Element Incorporation in Calcium Carbonate Biominerals Recapitulate Phylogeny for a Diverse Range of Marine Calcifiers

Intra‐Valve Elemental Distributions in Arctic Marine Ostracodes: Implications for Mg/Ca and Sr/Ca Paleothermometry

Genus Krithe (Ostracoda) as a Proxy to Decipher Paleoceanography: A Global Review of the Genu

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