Chamber volume development, metabolic rates, and selective extinction in cephalopods
Chamber volume development, metabolic rates, and selective extinction in cephalopods
复制标题
头足类动物的腔室体积发育、代谢率和选择性灭绝
作者：
Amane Tajika;N. Landman;R. Hoffmann;R. Lemanis;Naoki Morimoto;C. Ifrim;C. Klug
重建已灭绝生物的生理学是理解生物危机期间选择性灭绝机制的关键。灭绝生物的软组织很少被保存下来，因此，需要一个生理方面的替代物。在这里，我们通过评估腔体的形成如何对外部刺激(如环境变化)做出反应，来研究头足类贝壳是否产生了关于它们生理的信息。我们通过个体发育学测量了腔室体积，以检测螺类、鞘突类和菊科动物的腔体体积发育模式的差异。结果表明，这些头足类个体发育轨迹的差异涉及到是否存在脑室体积的突然减少。接受代谢率和生长之间的联系，我们假设这种差异源于不同头足类分支之间的代谢率不同。在大多数鹦鹉螺中，较高的代谢率与较小的孵化规模相结合，而不是较低的代谢率和大得多的孵化，可以解释白垩纪末食物可获得性低的结果导致菊科动物选择性灭绝的原因。
Reconstructing the physiology of extinct organisms is key to understanding mechanisms of selective extinction during biotic crises. Soft tissues of extinct organisms are rarely preserved and, therefore, a proxy for physiological aspects is needed. Here, we examine whether cephalopod conchs yield information about their physiology by assessing how the formation of chambers respond to external stimuli such as environmental changes. We measured chamber volume through ontogeny to detect differences in the pattern of chamber volume development in nautilids, coleoids, and ammonoids. Results reveal that the differences between ontogenetic trajectories of these cephalopods involve the presence or absence of abrupt decreases of chamber volume. Accepting the link between metabolic rate and growth, we assume that this difference is rooted in metabolic rates that differ between cephalopod clades. High metabolic rates combined with small hatching size in ammonoids as opposed to lower metabolic rates and much larger hatchlings in most nautilids may explain the selective extinction of ammonoids as a consequence of low food availability at the end of the Cretaceous.
非侵入性成像技术与形态测量相结合：螺旋藻案例研究
影响因子：
3
作者：
Hoffmann;Reinhoff;Lemanis
通讯作者：
Lemanis
影响因子：
3.7
作者：
Lemanis R;Korn D;Zachow S;Rybacki E;Hoffmann R
通讯作者：
Hoffmann R
影响因子：
4.9
作者：
Hoffmann, R.;Schultz, J. A.;Zachow, S.
通讯作者：
Zachow, S.