Carbon isotope values in conodont elements from the latest Devonian–Early Carboniferous carbonate platform facies (Timan-Pechora Basin)

Журавлев, А. В.; Смолева, И. В.

doi:10.3176/earth.2018.17

Cited by 10 publications

(4 citation statements)

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“…In recent years, there have been a few attempts to study the trophic position of conodonts using geochemical methods such as carbon isotopes (Zhuravlev and Smoleva 2018;Zhuravlev 2020;Zhuravlev et al 2020) and Ca isotopes (Balter et al 2019), all of which focused on Devonian or Mississippian conodont genera such as Polygnathus, Hindeodus, Icriodus, and Palmatolepis. These studies have concluded that conodonts were likely low-level or first-order consumers, feeding largely on zooplankton, but were unable to meaningfully distinguish trophic differences between different conodont taxa.…”

Section: Comparison With Other Studiesmentioning

confidence: 99%

Sr/Ca and Ba/Ca ratios support trophic partitioning within a Silurian conodont community from Gotland, Sweden

Terrill¹,

Jarochowska²,

Henderson³

et al. 2022

Paleobiology

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Conodonts were a highly diverse and abundant vertebrate group whose fossils are found in marine Paleozoic and Triassic strata around the world. They inhabited environments ranging from lagoons to open oceans and are represented by a wide variety of dental morphologies. Conodonts may have filled many different ecological niches and represent a significant proportion of nekton before the Devonian. Despite this, very little is known about trophic ecology of conodonts. While morphological diversity suggests a complex trophic structure within conodont communities, there is little evidence to support dietary niche partitioning among conodonts. We tested the hypothesis that individual conodont taxa occupied different trophic niches, using Sr/Ca and Ba/Ca ratios preserved in the dental elements of assemblages from Silurian strata of Gotland, Sweden. Sr/Ca and Ba/Ca have been shown to vary in vertebrate skeletal tissues depending on trophic positioning, although biological and environmental conditions can affect these ratios. Environmental influences were minimized by examining entire conodont communities from a tropical epeiric sea and by measuring strontium isotope ratios using thermal ionization mass spectrometry in the most metropolitan taxon (Ozarkodina confluens). Composition of white matter, a tissue unique to conodonts, was also analyzed using microprobe analysis, revealing significantly lower Sr concentrations than in surrounding lamellar tissue, suggesting taxon-specific histology should be considered when analyzing conodonts for geochemical data. Excluding taxa with highly variable quantities of white matter, the results show that each taxon preserves different Sr/Ca and Ba/Ca ratios with limited overlap, indicating variation in trophic positioning.

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Section: Comparison With Other Studiesmentioning

confidence: 99%

Sr/Ca and Ba/Ca ratios support trophic partitioning within a Silurian conodont community from Gotland, Sweden

Terrill¹,

Jarochowska²,

Henderson³

et al. 2022

Paleobiology

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show abstract

“…The precision of the δ 13 C org value is ±0.15‰. The δ 13 C org values in conodont elements are considered as a proxy of position in the trophic web and feeding specialization (Zhuravlev & Smoleva 2018).…”

Section: Methodsmentioning

confidence: 99%

“…It is notable that the recovery faunas demonstrate extremely wide ranges of δ 13 C org in conodont elements of Icriodus (from −27.9‰ to −23.1‰), Mitrellataxis (from −27.9‰ to −23.6‰), and Jablonnodus (from −28.1‰ to −23.1‰). The high variability of carbon isotope composition in conodont organic matter suggests unstable trophic relations in the postcrisis shallowwater ecosystems, probably due to rapid expansion of survivors into vacant ecospace (see also Sandberg et al 1988, Zhuravlev & Smoleva 2018. Appearance of icriodontids in deep water associations seems to be the result of their post crisis ecological expansion into the niches of eliminated taxa (biofacies telescoping of Sandberg et al 1988, compare Huang et al 2018, or transport of the shallow water conodont elements to deepwater environment by intensive calciturbidite currents in the early Famennian eustatic lowstand.…”

Section: Conodontsmentioning

confidence: 99%

Frasnian-Famennian (Upper Devonian) transition in the northern hemisphere (NE Laurussia and NE Siberia) - an overview

Журавлев¹,

Sokiran²

2020

Bull. Geosci.

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“…Preparation of samples for isotopic analysis of organic carbon from conodonts followed standard procedures using 10% acetic acid. Good conodont preservation and a moderate Conodont Alteration Index (CAI lower than 3) favor near-primary isotopic composition of organic matter (Zhuravlev and Smoleva, 2018;Zhuravlev, 2020).…”

Section: Isotope Composition Of Organic Carbon Of Conodont Elementsmentioning

confidence: 99%

Early-Middle Frasnian (Late Devonian) carbon isotope Event in the Timan-Pechora Basin (Chernyshev Swell, Pymvashor River section, North Cis-Urals, Russia)

Kotik

Журавлев

Maydl

et al. 2021

GeA

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Details of the Early-Middle Frasnian boundary interval of the Pymvashor River section (Timan-Pechora Basin, Cis-Urals, in the far north of European Russia) are revealed by biostratigraphically constrained carbonate (δ13Ccarb) and organic carbon (δ13Corg) stable data. The studied interval corresponds to the lower part of the Domanik Formation, which consists of interbedded limestone and shale beds. Organic-rich black shale that lacks bioturbation and benthic organisms indicates an oxygen-depleted depositional environment. Detection of isorenieratene derivatives in organic matter indicates that anoxia was present in the photic zone during deposition. The Pymvashor River section contains δ13Ccarb and δ13Corg isotope records related to the Early-Middle Frasnian isotope Event. The similarity between the Cis-Uralian (this study) and the Chinese δ13Ccarb and δ13Corg oscillations, including the twostep pattern of the recorded major positive excursions, suggests a robust correlation of the Late Devonian Early- Middle Frasnian isotope Event and minor intra-event excursions. Magnitude of variations and values of δ13Corg and δ13Ccarb in the punctata Zone in the Pymvashor River section are minor than those observed in the North American, Polish, and Chinese successions. Such difference may reflect specific variation of the local environments.

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Carbon isotope values in conodont elements from the latest Devonian–Early Carboniferous carbonate platform facies (Timan-Pechora Basin)

Cited by 10 publications

References 0 publications

Sr/Ca and Ba/Ca ratios support trophic partitioning within a Silurian conodont community from Gotland, Sweden

Sr/Ca and Ba/Ca ratios support trophic partitioning within a Silurian conodont community from Gotland, Sweden

Frasnian-Famennian (Upper Devonian) transition in the northern hemisphere (NE Laurussia and NE Siberia) - an overview

Early-Middle Frasnian (Late Devonian) carbon isotope Event in the Timan-Pechora Basin (Chernyshev Swell, Pymvashor River section, North Cis-Urals, Russia)

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