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Stress-Related Evolution in Triassic Conodonts and the Middle Norian Juvenile Mortality

Karádi, Viktor and Virág, Attila and Kolar-Jurkovšek, Tea and Jurkovšek, Bogdan (2020) Stress-Related Evolution in Triassic Conodonts and the Middle Norian Juvenile Mortality. In: Morphogenesis, Environmental Stress and Reverse Evolution. Springer, pp. 37-58.

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Abstract

Conodonts are of great importance in Paleozoic and Early Triassic stratigraphy, which is proven by the large number of studies on their biostratigraphic relevance. Less emphasis was placed on the paleoecology of this group, even though environmental controls highly affect the distribution and applicability of conodonts. Few records are available from the Triassic, in which lethal or sublethal environmental stress is considered as the driving factor of evolutionary trends. Such cases are reviewed from the Permian-Triassic transition involving studies on the genera Hindeodus, Isarcicella, and Neogondolella. A summary is given on the characteristic taxa (e.g., Pseudofurnishius murcianus, Nicoraella budaensis, and Mockina slovakensis) of the Middle and Upper Triassic, which often formed monospecific faunas in the unstable environments of the restricted basins and marginal seas of the Tethys. The phenomenon of the Middle Norian juvenile mortality is introduced herein, based on the faunas of four Hungarian and one Slovenian successions from the area of the western Tethys. The recovered pectiniform conodont elements were classified in growth stages and analyzed in the R programming environment in order to reveal the distribution pattern of juvenile/adult-dominated assemblages within the successions. The results show a general drop in the number of specimens and a decrease in the number of adults in the Middle Norian beds of the Danube-E blocks (Hungary), which indicates an ecologically unfavorable environment for conodont animals during this time. The faunas from the Buda Hills (Hungary) and especially from the Dovško succession (Slovenia) are rich in adult specimens and reflect that these areas were suitable habitats for conodonts in the Middle Norian. The reasons for the environmental change in the Early-Middle Norian transitional interval have yet to be determined, but the results of the present study provide a good base for future research integrating sedimentological and geochemical investigations.

Item Type: Book Section
Subjects: Q Science / természettudomány > QH Natural history / természetrajz > QH359-425 Evolution (Biology) / evolúció
Q Science / természettudomány > QH Natural history / természetrajz > QH526 Paleontology / őslénytan
Depositing User: Piroska Pazonyi
Date Deposited: 09 Nov 2021 15:03
Last Modified: 03 Apr 2023 07:28
URI: http://real.mtak.hu/id/eprint/133385

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