| Autor: |
Nätscher, P. S., Dera, G., Reddin, C. J., Rita, P., De Baets, K. |
| Předmět: |
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| Zdroj: |
Vilnius University Proceedings; 2023, Vol. 35, p49-49, 1p |
| Abstrakt: |
One of the most common responses of marine ectotherms to current and past global warming is a decrease in adult body size through an increased developmental rate in early life. However, changes in morphology that presumably emerge from such changes in early ontogenetic growth are not frequently studied in palaeontology, even though they can indicate details of an organism's ecological response to environmental crises, such as changes in resource acquisition or function. The Pliensbachian--Toarcian (Pli--Toa) environmental crisis (~183 Mya) is the first pulse of the Early Toarcian Ocean Anoxic Event, and is driven by rapid warming and acidification of oceanic waters, triggered by volcanic activity of the Karoo-Ferrar Large Igneous Province. We use 3D geometric morphometrics to study morphological changes of 144 belemnites (extinct coleoids) from five consecutive subzones across the Pli--Toa crisis in Peniche, Portugal. Our results show that two belemnite species (Catateuthis longiforma and Passaloteuthis bisulcata), which decrease in body size also significantly increase in robustness during the Pli-Toa crisis. While adults drive the change in C. longiforma, the increasing robustness of P. bisulcata is driven by juveniles, indicating varying ecological tolerances among the species and ontogenetic stages. The morphological change in the juveniles of P. bisulcata is significantly correlated with seawater pH, eluding to similarities with stress-induced hypercalcification of extant cuttlefish in response to climate-related stressors, such as acidification and starvation. These results stress the importance of taking life history into account, when studying impacts of environmental stressors on fossil marine organisms, to facilitate the comparability to extant organisms. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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