Weber Céline, Hautmann Michael, Tajika Amane, Klug Christian
Paläontologisches Institut Und Museum, Universität Zürich, Karl-Schmid-Strasse 4, 8006 Zurich, Switzerland.
Division of Paleontology (Invertebrates), American Museum of Natural History, Central Park West 79th Street, New York, NY 10024 USA.
Swiss J Palaeontol. 2022;141(1):4. doi: 10.1186/s13358-022-00246-2. Epub 2022 Apr 18.
The impact of increasing atmospheric CO and the resulting decreasing pH of seawater are in the focus of current environmental research. These factors cause problems for marine calcifiers such as reduced calcification rates and the dissolution of calcareous skeletons. While the impact on recent organisms is well established, little is known about long-term evolutionary consequences. Here, we assessed whether ammonoids reacted to environmental change by changing septal thickness. We measured the septal thickness of ammonoid phragmocones through ontogeny in order to test the hypothesis that atmospheric CO, seawater pH and other factors affected aragonite biomineralisation in ammonoids. Particularly, we studied septal thickness of ammonoids before and after the ocean acidification event in the latest Triassic until the Early Cretaceous. Early Jurassic ammonoid lineages had thinner septa relative to diameter than their Late Triassic relatives, which we tentatively interpret as consequence of a positive selection for reduced shell material as an evolutionary response to this ocean acidification event. This response was preserved within several lineages among the Early Jurassic descendants of these ammonoids. By contrast, we did not find a significant correlation between septal thickness and long-term atmospheric CO or seawater pH, but we discovered a correlation with palaeolatitude.
The online version contains supplementary material available at 10.1186/s13358-022-00246-2.
大气中二氧化碳增加以及随之而来的海水pH值下降的影响是当前环境研究的重点。这些因素给海洋钙化生物带来了问题，比如钙化率降低和钙质骨骼溶解。虽然对现存生物的影响已得到充分证实，但对于长期进化后果却知之甚少。在这里，我们评估了菊石是否通过改变隔壁厚度来应对环境变化。我们测量了菊石房室的隔壁厚度随个体发育的变化，以检验大气二氧化碳、海水pH值和其他因素影响菊石文石生物矿化的假设。特别是，我们研究了晚三叠世至早白垩世海洋酸化事件前后菊石的隔壁厚度。早侏罗世菊石谱系的隔壁相对于直径比晚三叠世的亲属更薄，我们初步将其解释为作为对该海洋酸化事件的进化反应，对减少壳质材料进行正向选择的结果。这种反应在这些菊石的早侏罗世后代的几个谱系中得以保留。相比之下，我们没有发现隔壁厚度与长期大气二氧化碳或海水pH值之间存在显著相关性，但我们发现了与古纬度的相关性。
在线版本包含可在10.1186/s13358-022-00246-2获取的补充材料。
