Reevaluating hydrodynamic performance of Late Triassic–Early Jurassic ammonoid shells with a 1D trajectory model

IF 1.6 4区 地球科学 Q2 PALEONTOLOGY
Nicholas Hebdon , Kathleen A. Ritterbush , YunJi Choi , David J. Peterman
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引用次数: 4

Abstract

Biomechanical analyses provide unique insights on state shifts in the ecology of extinct communities. Ammonoids present a compelling case study for coupling biomechanical analysis with ecology given their robust fossil record of external conchs. We present a trajectory model to evaluate hydrodynamical advantages and challenges associated with ammonoid conch form. The model is a one-dimensional calculation estimating the dynamic feedbacks between different components of an ammonite’s motion including thrust, drag, acceleration, and distance traveled. Computational fluid dynamics simulations were performed on eleven different ammonoid conch morphotypes and integrated into a mathematical model to analyze the dynamics of swimming across a combination of conch diameters (5, 10, and 20 cm) and jet rhythms (a single jet or series of three pulses). We compared the efficacy of short-term bursts of motion to that of long-term cruising and found: inflated shapes (i.e., spherocones) offer the fastest short-term motion, but at the greatest costs; heavily streamlined shapes (i.e., platycones) offer long cruise distances, but with ineffective short-term motion; and visibly-coiled shapes (i.e., serpenticones) appear to offer intermediate performance in both locomotion styles. Size is critical in ranking the performance of different conch shapes in both locomotion styles because ranking is determined predominantly by the amount of thrust an animal is capable of generating. With increasing size, Reynolds number increases and the effects of second-order morphological characters become more pronounced and alter the performance ranking of conchs. Finally, we present a visual analysis of the flow regimes and shape details that may drive these hydrodynamic consequences. We speculate that serpenticone morphologies capitalized on these subtleties with a morphology that provided reasonably high-speed swimming at small sizes relevant to juveniles while maintaining relatively efficient coasting locomotion at the larger sizes relevant to adult animals. We highlight the ubiquitous serpenticones of the Early Jurassic as a case study for applying biomechanical data to a paleoecological context. The broad range of morphotypes expressed by ammonoids in the Late Triassic is dramatically pared down during the End Triassic extinction. In the few million years following the extinction, ammonoids diversify into a suite of shapes with a more restricted range of locomotor performance, and only much later is the full range of morphology recovered.

用一维轨迹模型重新评价晚三叠世—早侏罗世氨壳流体力学性能
生物力学分析为灭绝群落的生态状态变化提供了独特的见解。菊石提供了一个令人信服的案例研究耦合生物力学分析与生态学鉴于其强大的化石记录外部海螺。我们提出了一个轨迹模型来评估与氨类海螺形式相关的流体动力学优势和挑战。该模型是一个一维计算,估计了菊石运动的不同组成部分之间的动态反馈,包括推力、阻力、加速度和移动距离。研究人员对11种不同形态的氨气海螺进行了计算流体动力学模拟,并将其整合到一个数学模型中,以分析在不同直径(5、10和20厘米)和射流节奏(单个射流或一系列三脉冲)组合下游泳的动力学。我们将短期运动爆发的效果与长期巡航的效果进行了比较,发现膨胀的形状(即球体)提供了最快的短期运动,但代价最大;高度流线型的形状(如扁圆形)提供较长的巡航距离,但短期运动效果不佳;而明显的盘绕形状(即蛇形体)似乎在两种运动方式中都提供了中等的表现。在对不同形状的海螺在两种运动方式中的表现进行排名时,尺寸是至关重要的,因为排名主要取决于动物能够产生的推力。随着螺壳尺寸的增大,雷诺数增大,二级形态特征的影响更加明显,从而改变了螺壳的性能等级。最后,我们提出了可能驱动这些流体动力学结果的流动状态和形状细节的可视化分析。我们推测蛇形体的形态利用了这些微妙之处,在与幼年动物相关的小尺寸上提供了合理的高速游泳,而在与成年动物相关的大尺寸上保持了相对有效的滑行运动。我们强调了早侏罗世普遍存在的蛇形锥体作为将生物力学数据应用于古生态背景的案例研究。在晚三叠世,菊石表达的广泛形态型在三叠纪末灭绝期间急剧减少。在大灭绝后的几百万年里,菊石进化成一系列形状,运动能力的范围更有限,直到很久以后才恢复了完整的形态。
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来源期刊
Geobios
Geobios 地学-古生物学
CiteScore
3.30
自引率
6.20%
发文量
28
审稿时长
6-12 weeks
期刊介绍: Geobios publishes bimonthly in English original peer-reviewed articles of international interest in any area of paleontology, paleobiology, paleoecology, paleobiogeography, (bio)stratigraphy and biogeochemistry. All taxonomic groups are treated, including microfossils, invertebrates, plants, vertebrates and ichnofossils. Geobios welcomes descriptive papers based on original material (e.g. large Systematic Paleontology works), as well as more analytically and/or methodologically oriented papers, provided they offer strong and significant biochronological/biostratigraphical, paleobiogeographical, paleobiological and/or phylogenetic new insights and perspectices. A high priority level is given to synchronic and/or diachronic studies based on multi- or inter-disciplinary approaches mixing various fields of Earth and Life Sciences. Works based on extant data are also considered, provided they offer significant insights into geological-time studies.
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