Constraining the Role of Shell Porosity in the Regulation of Shell Calcification Intensity in the Modern Planktonic Foraminifer Orbulina Universa d'Orbigny

IF 0.9 4区 地球科学 Q4 PALEONTOLOGY Journal of Foraminiferal Research Pub Date : 2020-04-01 DOI:10.2113/gsjfr.50.2.195
M. Weinkauf, M. Zwick, M. Kučera
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引用次数: 6

Abstract

Porosity in planktonic foraminifers (the proportion of the shell surface covered by pores) is a conspicuous quantitative trait, well preserved in fossil shells and implicated as a source of environmental information. Despite its potential, the functional importance of porosity remains poorly understood. It is likely that pores are important in gas exchange, and differences in shell porosity among species or within species may reflect differences in metabolic rates or ambient oxygen concentration. Theoretically, porosity also affects the weight of the shell; and differences in porosity may reflect an adaptation to the specific density of the seawater or differences in allocation of resources to calcification (shell calcification intensity). Finally, there is evidence that porosity may differ between closely related cryptic species. Here we analyzed the potential role of porosity as a regulator of calcification intensity in Orbulina universa by combining biometric measurements based on sediment surface samples from the western Atlantic with a modelling approach. Specimens of O. universa were analyzed concerning their shell size, shell thickness, and shell porosity under light and scanning electron microscopy, and weighed using a microbalance. The resulting empirically derived model shows an effect size of shell thickness that is 7.5 times larger than the effect of shell porosity on the overall shell calcification intensity. This indicates that porosity is unlikely to be used by this species to regulate calcification intensity. By implementing the model on literature data which analyzed calcification intensity in O. universa, we also show that porosity differences among cryptic species in O. universa are unlikely to explain the observed differences in calcification intensity within the species. These findings indicate that functional explanations for differences in porosity in planktonic foraminifers have to be sought outside of calcification or density regulation and, conversely, that the observed differences in calcification intensity are likely driven by shell thickness and their relationship with environmental forcing can be applied without correction for porosity.
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制约现代浮游生物Orbulina Universa d’Orbigny中外壳孔隙率在调节外壳钙化强度中的作用
浮游有孔虫的孔隙率(外壳表面被孔隙覆盖的比例)是一个显著的数量特征,在化石外壳中保存完好,是环境信息的来源。尽管孔隙率具有潜力,但其功能重要性仍知之甚少。孔隙可能在气体交换中很重要,物种之间或物种内部外壳孔隙率的差异可能反映了代谢率或环境氧浓度的差异。从理论上讲,孔隙率也会影响外壳的重量;并且孔隙率的差异可以反映对海水的比密度的适应或者对钙化的资源分配的差异(外壳钙化强度)。最后,有证据表明,密切相关的隐蔽物种之间的孔隙率可能不同。在这里,我们通过将基于西大西洋沉积物表面样本的生物特征测量与建模方法相结合,分析了孔隙度作为奥布林纳宇宙钙化强度调节因子的潜在作用。在光镜和扫描电子显微镜下,对universa的标本进行了外壳尺寸、外壳厚度和外壳孔隙率的分析,并使用微量天平称重。由此得出的经验推导模型显示,外壳厚度的影响大小是外壳孔隙率对整体外壳钙化强度影响的7.5倍。这表明该物种不太可能利用孔隙率来调节钙化强度。通过在分析O.universa钙化强度的文献数据上实现该模型,我们还表明,O.universa隐物种之间的孔隙率差异不太可能解释观察到的物种内钙化强度的差异。这些发现表明,浮游有孔虫孔隙率差异的功能解释必须在钙化或密度调节之外寻求,相反,观察到的钙化强度差异可能是由外壳厚度驱动的,它们与环境作用力的关系可以在不校正孔隙率的情况下应用。
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来源期刊
Journal of Foraminiferal Research
Journal of Foraminiferal Research 地学-古生物学
CiteScore
2.10
自引率
9.10%
发文量
32
审稿时长
>12 weeks
期刊介绍: JFR publishes original papers of international interest dealing with the Foraminifera and allied groups of organisms. Review articles are encouraged.
期刊最新文献
2023 Cushman Foundation for Foraminiferal Research Award and Grant Recipients The Later Holocene Foraminifera of Liverpool Bay (Bae Lerpwl), British Isles: Morphospecies and Community Level Patterns Micro- to Macro-Scale Foraminiferal Distributions: The Contributions of Martin A. Buzas* Oceanic-Scale Species Diversity of Living Benthic Foraminifera: Insights into Neogene Diversity, Community Structure, Species Duration, and Biogeography Benthic Foraminiferal Response to the Aptian−Albian Carbon Cycle Perturbation in the Atlantic Ocean
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