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首页> 外文期刊>Marine ecology >Ontogenic variation and effect of collection procedure on leaf biomechanical properties of Mediterranean seagrass Posidonia oceanica (L.) Delile
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Ontogenic variation and effect of collection procedure on leaf biomechanical properties of Mediterranean seagrass Posidonia oceanica (L.) Delile

机译：本体发育变异和收集程序对地中海海草波塞冬草（L.）Delile叶片生物力学特性的影响

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Leaf mechanical traits are important to understand how aquatic plants fracture and deform when subjected to abiotic (currents or waves) or biotic (herbivory attack) mechanical forces. The likely occurrence of variation during leaf ontogeny in these traits may thus have implications for hydrodynamic performance and vulnerability to herbivory damage, and may be associated with changes in morphologic and chemical traits. Seagrasses, marine flowering plants, consist of shoot bundles holding several leaves with different developmental stages, in which outer older leaves protect inner younger leaves. In this study we examined the long-lived seagrass Posidonia oceanica to determine ontogenic variation in mechanical traits across leaf position within a shoot, representing different developmental stages. Moreover, we investigated whether or not the collection procedure (classical uprooted shoot versus non-destructive shoot method: cutting the shoot without a portion of rhizome) and time span after collection influence mechanical measurements. Neither collection procedure nor time elapsed within 48h of collection affected measurements of leaf biomechanical traits when seagrass shoots were kept moist in dark cool conditions. Ontogenic variation in mechanical traits in P.oceanica leaves over intermediate and adult developmental stages was observed: leaves weakened and lost stiffness with aging, while mid-aged leaves (the longest and thickest ones) were able to withstand higher breaking forces. In addition, younger leaves had higher nitrogen content and lower fiber content than older leaves. The observed patterns may explain fine-scale within-shoot ecological processes of leaves at different developmental stages, such as leaf shedding and herbivory consumption in P.oceanica.
机译：叶片机械性状对于了解水生植物在受到非生物（水流或波浪）或生物（草食动物攻击）机械力时如何破裂和变形非常重要。这些性状在叶片发育过程中可能发生的变异可能对水动力性能和草食性损害的脆弱性产生影响，并且可能与形态和化学性状的变化有关。海草是海洋开花植物，由许多束具有不同发育阶段的叶片的嫩芽束组成，其中较老的外侧叶片可保护较年轻的内侧叶片。在这项研究中，我们检查了长寿命的海草Posidonia oceanica，以确定代表不同发育阶段的新梢跨叶片位置的机械性状的个体发生变化。此外，我们调查了收集程序（经典连根拔起的芽与非破坏性芽的方法：切掉没有根茎的芽）和收集后的时间跨度是否会影响机械测量。当海草芽在阴凉的条件下保持湿润时，收集程序和收集后48小时内未经过的时间都不会影响叶片生物力学特性的测量。观察到中，成年发育过程中大洋红叶叶片机械性状的个体发生变化：叶片随着衰老而变弱并失去刚度，而中年叶片（最长和最厚的叶片）能够承受更高的断裂力。另外，年轻的叶片比老叶片具有更高的氮含量和更低的纤维含量。观察到的模式可能解释了在不同发育阶段叶片的精细尺度的枝条内生态过程，例如大洋李的叶片脱落和草食性消费。

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