Strontium isotopes and the long-term residency of thalattosuchians in the freshwater environment

Martin, Jérémy E.; Deesri, Uthumporn; Liard, Romain; Wattanapituksakul, Athiwat; Suteethorn, Suravech; Lauprasert, Komsorn; Tong, Haiyan; Buffetaut, Éric; Suteethorn, Varavudh; Suan, Guillaume; Télouk, Philippe; Balter, Vincent

doi:10.1017/pab.2015.42

Cited by 35 publications

(29 citation statements)

References 71 publications

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“…16A). The present result, using the matrix of Wilberg (2015a) confirms a previous result (Martin et al, 2016) using the earlier matrix of Young et al (2009).…”

Section: Affinities and Comparisonssupporting

confidence: 92%

“…The majority of teleosaurids are recovered from marine habitats, although there are records from freshwater deposits in peninsular Thailand (Buffetaut et al 1994a) and China (Young, 1948). A freshwater habitus for the teleosaurids of the Late Jurassic Phu Noi locality in northeastern Thailand was recently confirmed using strontium isotope ratios (Martin et al, 2016).…”

Section: Introductionmentioning

confidence: 96%

“…Marine teleosaurids are generally found in marginal/coastal deposits. Fossils from estuarine or brackish environments, for example in the Late Jurassic of Portugal (Krebs, 1967;1968) or in the Middle Jurassic of Madagascar (Newton, 1893) suggest an ability to shift between habitats, which raises ecological and physiological questions related to salt excretion, migrations, resource use, reproduction or refuge from predators (Martin et al, 2016). The versatile habitat preferences of teleosaurids may have proved selectively advantageous in the context of sea-level and other global environmental changes (Benson and Butler, 2011;Martin et al, 2014a;Tennant et al, 2017), possibly permitting their survival into the Cretaceous, as recently proposed with the report of Machimosaurus in the Hauterivian of Tunisia (Fanti et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

“…Since the discovery of the Phu Noi fossil site in 2008, a wealth of disarticulated teleosaurid specimens have been unearthed and prepared from this single locality. The deposit shows evidence of aerial exposure with paleosol development and insect burrows (Martin et al, 2016) and in addition to the teleosaurids, contains a known fauna of both aquatic and terrestrial vertebrates. These include hybodont sharks (Cuny et al, 2014), the ginglymodian fish Isanichthys lertboosi , the xinjianchelyid turtle Phunoichelys thirakhupti (Tong et al, 2015) an undescribed freshwater turtle, ornithopods (Buffetaut et al, 2014), theropods (Chanthasit, 2011), and undescribed remains of sauropod dinosaurs, temnospondyls, and pterosaurs (Buffetaut et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

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A new freshwater teleosaurid from the Jurassic of northeastern Thailand

Martin

Suteethorn

Lauprasert

et al. 2018

Journal of Vertebrate Paleontology

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The core of the fossil record of Teleosauridae, a family of thalattosuchian crocodylomorphs, is well known from western Tethyan marine deposits of the Jurassic. Outside this province, their fossil record is patchy and in need of revision with specimens from Russia, Madagascar and Asia. Peipehsuchus teleorhinus is known from the Early or Middle Jurassic of China and teleosaurid specimens were mentioned or preliminarily described from two Jurassic localities in Thailand, yet they were not assigned to a given taxon. Thanks to recent fieldwork, at least 10 individuals represented by cranial material were excavated and prepared from a single Jurassic locality known as Phu Noi in the lower Phu Kradung Formation of northeastern Thailand. Here, we describe these specimens together with disarticulated postcranial elements and erect a new taxon, Indosinosuchus potamosiamensis gen. et sp. nov.. Phylogenetic analyses confirm the teleosaurid affinities of the new species, which does not form an exclusive clade with the Chinese teleosaurid Peipehsuchus teleorhinus. The presence of teleosaurids at Phu Noi and a preliminary account of its faunal content favor a Middle to Late Jurassic age for the fossil-bearing horizon. In contrast, Cretaceous deposits in Thailand are characterized by goniopholidids and pholidosaurids indicating a faunal turnover in SE Asia across the Jurassic-Cretaceous. As previously shown by isotope data, the new teleosaurid species was a resident of the freshwater environment and co-occurs with remains of exclusively terrestrial taxa such as sauropod, ornithopod and theropod dinosaurs and other freshwater reptiles such as turtles and temnospondyls.

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“…16A). The present result, using the matrix of Wilberg (2015a) confirms a previous result (Martin et al, 2016) using the earlier matrix of Young et al (2009).…”

Section: Affinities and Comparisonssupporting

confidence: 92%

Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A new freshwater teleosaurid from the Jurassic of northeastern Thailand

Martin

Suteethorn

Lauprasert

et al. 2018

Journal of Vertebrate Paleontology

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“…; Martin et al . ) or to reconstruct palaeoenvironments of even older faunas such as elasmobranchs of the Permian and Triassic (Fischer et al . , ).…”

Section: Non‐traditional Isotopes In Modern Faunasmentioning

confidence: 99%

Non‐traditional isotope perspectives in vertebrate palaeobiology

2017

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The recent development of Multi-Collector Inductively Coupled PlasmaMass Spectrometry (MC-ICPMS), notably in the disciplines of earth sciences, now allows the measurement of precise isotope ratios, even under low concentration. Nontraditional isotope systems, such as alkaline earth (Ca, Mg) and transition (Cu, Fe, Zn) metals are now being measured in a variety of biological tissues, including bone and teeth. Although our understanding of the environmental and biological mechanisms behind the fractionation of such elements is still in its infancy, some of these isotopes are suspected to fractionate along the food chain as has been reported in the literature for calcium, magnesium and zinc. Other geochemical methods, such as concentration analyses permit a prior assessment of diagenesis in the fossils to be analysed and such an approach allows recognising that in some circumstances, not only enamel but also dentine or bone can preserve its original biogenic composition. The aims here are to review the current knowledge surrounding these various isotopic tools, address their potential preservation in biological apatite and provide the palaeobiologist a guide on the different toolkits available and discuss their potential applications in vertebrate palaeobiology with a case study involving two mammal assemblages from the Pleistocene of Europe.Key words: non-traditional isotopes, palaeobiology, calcium, cave bear, Pleistocene.GEOCHEMICAL tools are a great asset to infer biological characteristics in fossil organisms that otherwise would remain completely unnoticed with morphological 2 observations alone. Among stable isotopes, carbon (C), oxygen (O) and nitrogen (N) have been and are still widely used in ecology, archaeology and in palaeoecology.From the vertebrate individual organism to the community, it is possible to reconstruct body temperatures and infer thermophysiology, reconstruct ambient palaeoenvironmental conditions and infer habitat use and migrations; and last but not least to reconstruct diet and trophic structures in ancient food webs. Most isotope approaches rely on stable isotope ratios of carbon and oxygen but also on radiogenic strontium preserved in fossilised tooth and bone. Elemental concentrations have also proved useful in many contexts such as dietary inference. For example, elemental ratios of strontium to calcium or barium to calcium allow reconstructing ecosystem structures.Contrary to light isotope systems, which have a variability beyond 10 ‰, nontraditional isotopes comprising alkaline earths (Ca, Mg) or transition metals (Cu, Fe, Zn), show isotope variability within a maximum range of 2-3‰. Recent analytical progresses from the domains of earth sciences now allow the measurement of such stable isotope systems, which show limited fractionation and require high precision and accuracy of measurements from mass spectrometers. The main basis for all those geochemical applications is already starting to be applied to archaeological studies (see review by Jaouen and Pons, 2016...

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The ecological diversification and evolution of Teleosauroidea (Crocodylomorpha, Thalattosuchia), with insights into their mandibular biomechanics

Johnson

Foffa

Young

et al. 2022

Ecology and Evolution

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Throughout the Jurassic, a plethora of marine reptiles dominated ocean waters, including ichthyosaurs, plesiosaurs and thalattosuchian crocodylomorphs. These Jurassic ecosystems were characterized by high niche partitioning and spatial variation in dietary ecology. However, while the ecological diversity of many marine reptile lineages is well known, the overall ecological diversification of Teleosauroidea (one of the two major groups within thalattosuchian crocodylomorphs) has never been explored. Teleosauroids were previously deemed to have a morphologically conservative body plan; however, they were in actuality morphofunctionally more diverse than previously thought. Here we investigate the ecology and feeding specializations of teleosauroids, using morphological and functional cranio‐dental characteristics. We assembled the most comprehensive dataset to date of teleosauroid taxa (approximately 20 species) and ran a series of principal component analyses (PC) to categorize them into various feeding ecomorphotypes based on 17 dental characteristics (38 specimens) and 16 functionally significant mandibular characters (18 specimens). The results were examined in conjunction with a comprehensive thalattosuchian phylogeny (153 taxa and 502 characters) to evaluate macroevolutionary patterns and significant ecological shifts. Machimosaurids display a well‐developed ecological shift from: (1) slender, pointed tooth apices and an elongate gracile mandible; to (2) more robust, pointed teeth with a slightly deeper mandible; and finally, (3) rounded teeth and a deep‐set, shortened mandible with enlarged musculature. Overall, there is limited mandibular functional variability in teleosaurids and machimosaurids, despite differing cranial morphologies and habitat preferences in certain taxa. This suggests a narrow feeding ecological divide between teleosaurids and machimosaurids. Resource partitioning was primarily related to snout and skull length as well as habitat; only twice did teleosauroids manage to make a major evolutionary leap to feed distinctly differently, with only the derived machimosaurines successfully radiating into new feeding ecologies.

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Strontium isotopes and the long-term residency of thalattosuchians in the freshwater environment

Cited by 35 publications

References 71 publications

A new freshwater teleosaurid from the Jurassic of northeastern Thailand

A new freshwater teleosaurid from the Jurassic of northeastern Thailand

Non‐traditional isotope perspectives in vertebrate palaeobiology

The ecological diversification and evolution of Teleosauroidea (Crocodylomorpha, Thalattosuchia), with insights into their mandibular biomechanics

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