Is the relative thickness of ammonoid septa influenced by ocean acidification, phylogenetic relationships and palaeogeographic position?
Is the relative thickness of ammonoid septa influenced by ocean acidification, phylogenetic relationships and palaeogeographic position?
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DOI：
10.1186/s13358-022-00246-2
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发表时间：
2022
影响因子：
3
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大气中二氧化碳含量增加的影响以及由此导致的海水pH值下降是当前环境研究的重点。这些因素导致海洋钙化物的问题，如钙化率降低和钙质骨骼的溶解。虽然对现代生物的影响已经得到了很好的证实，但对长期的进化后果却知之甚少。在这里，我们评估菊石是否通过改变间隔厚度对环境变化作出反应。我们通过个体发育测量菊石phragmocones的隔膜厚度，以检验假设，大气pCO 2，海水pH值和其他因素影响文石生物矿化菊石。特别地，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间隔厚度。早侏罗世菊石谱系有较薄的隔膜相对于直径比他们的晚三叠世的亲戚，我们初步解释为减少壳材料的进化反应，这一海洋酸化事件的积极选择的结果。这种反应被保存在早侏罗世这些菊石的后代中的几个谱系中。相比之下，我们没有发现一个显着的相关性，中隔厚度和长期的大气pCO 2或海水pH值，但我们发现了与古纬度的相关性。在线版本包含补充材料，可通过10.1186/s13358-022-00246-2获得。
The impact of increasing atmospheric CO2 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 pCO2, 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 pCO2 or seawater pH, but we discovered a correlation with palaeolatitude. The online version contains supplementary material available at 10.1186/s13358-022-00246-2.