Biomechanics and physiology of Odontopteris cantabrica and Odontopteris schlotheimii (Medullosales, Pennsylvanian, Canada)

IF 5.6 2区 工程技术 Q2 ENERGY & FUELS
José A. D'Angelo , James C. Hower , Gerardo Camí , Maiten A. Lafuente Diaz
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Abstract

As part of the ongoing research project “Chemistry, Biomechanics, and Physiology of Carboniferous plants”, this study investigates two of the largest Canadian specimens of Odontopteris cantabrica Wagner, 1969 (22-cm long) and Odontopteris schlotheimii Brongniart, 1828-1831 (7-cm long) from the Pennsylvanian Sydney Coalfield. Specimens of both species co-occur in the roof shale of the Lloyd Cove coal seam (Asturian-Cantabrian boundary; vitrinite reflectance Ro% = 0.65) at Brogan's pit locality, Cape Breton Island, Nova Scotia, Canada. Well-preserved compressions of pinnules (rachises were not preserved) are analyzed by Fourier transform infrared (FTIR) spectroscopy. These data are examined with the purpose of (i) calculating pinnular density (δ) and associated biomechanical and physiological properties, i.e., tensile strength (TS = resistance to fracture), tensile modulus of elasticity (TME = stiffness), and leaf mass per area (LMA = biomass investment and construction cost); (ii) comparing the data for δ, TS, TME, and LMA of O. cantabrica and O. schlotheimii at two levels: interspecific differences and intraspecific variations between pinnules representing different (proximal and distal) parts of each frond; (iii) comparing data for δ, TS, TME, and LMA of O. cantabrica and O. schlotheimii with those of previously studied medullosalean frond taxa, namely Alethopteris ambigua and Neuropteris ovata var. simonii; and (iv) obtaining new insights into the possible growth habit of both fronds. Results indicate that pinnular density, resistance to fracture, stiffness, and leaf mass per area vary continuously throughout the fronds and indicate biomechanical resistance and physiological efficiency. ANOVA tests show that the pinnules of O. cantabrica and O. schlotheimii are not significantly different in terms of density and biomechanical/physiological characteristics overall. However, within each species, proximal pinnules exhibit statistically higher density, stiffness, resistance to fracture, and metabolic construction cost compared to distal pinnules. The δ, TS, TME, and LMA data for O. cantabrica and O. schlotheimii are notably lower than those of N. ovata var. simonii and A. ambigua. The order of values for δ, TS, TME, and LMA follows: N. ovata var. simonii > A. ambigua > O. cantabrica = O. schlotheimii. Considering the values for δ, TS, TME, LMA, and general morphology, it is possible that O. cantabrica and O. schlotheimii had a semi-self-supporting to self-supporting (arborescent) growth form.
cantabrica齿齿兽和schlotheimii齿齿兽(Medullosales, pennsylvania, pennsylvania)的生物力学和生理学
作为正在进行的研究项目“石炭纪植物的化学、生物力学和生理学”的一部分,本研究调查了两个最大的加拿大标本,1969年(22厘米长)的cantabrica Wagner和1828-1831年(7厘米长)的Odontopteris schlotheimii Brongniart,来自宾夕法尼亚悉尼煤田。在劳埃德湾煤层(阿斯图里—坎塔布连边界)顶板页岩中,这两种样品共存;加拿大新斯科舍省布雷顿角岛布罗根坑地区镜质组反射率Ro% = 0.65)。用傅立叶变换红外光谱分析了保存完好的小叶压缩(小叶未保存)。对这些数据进行检查的目的是:(1)计算叶尖密度(δ)和相关的生物力学和生理特性,即抗拉强度(TS =抗断裂)、抗拉弹性模量(TME =刚度)和每面积叶质量(LMA =生物量投资和建设成本);(ii)在两个水平上比较了甘布兰和石竹的δ、TS、TME和LMA数据:代表每叶不同部分(近端和远端)的小叶之间的种间差异和种内差异;(3)与已有研究的延髓纲前叶类群Alethopteris ambigua和Neuropteris ovata var. simonii的δ、TS、TME和LMA数据进行比较;(iv)对两种叶子可能的生长习性有了新的认识。结果表明,叶尖密度、断裂阻力、刚度和单位面积叶质量在整个叶片中呈连续变化,表明了生物力学阻力和生理效率。方差分析结果表明,在密度和生物力学生理特征方面,两种植物的小叶总体上没有显著差异。然而,在每个物种中,与远端小叶相比,近端小叶在统计上表现出更高的密度、刚度、抗骨折性和代谢构建成本。坎塔布兰和施罗氏稻的δ、TS、TME和LMA数据均显著低于紫斑稻和双歧稻。δ、TS、TME和LMA的取值顺序为:N. ovata var. simonii >;A.歧义;O. cantabrica = O. schlotheimii。综合δ、TS、TME、LMA值和总体形态特征,推测其生长形态可能为半自立型到自立型(乔木型)。
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来源期刊
International Journal of Coal Geology
International Journal of Coal Geology 工程技术-地球科学综合
CiteScore
11.00
自引率
14.30%
发文量
145
审稿时长
38 days
期刊介绍: The International Journal of Coal Geology deals with fundamental and applied aspects of the geology and petrology of coal, oil/gas source rocks and shale gas resources. The journal aims to advance the exploration, exploitation and utilization of these resources, and to stimulate environmental awareness as well as advancement of engineering for effective resource management.
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