Turbinaria ornata (Phaeophyceae) varies size and strength to maintain environmental safety factor across flow regimes
Turbinaria ornata (Phaeophyceae) varies size and strength to maintain environmental safety factor across flow regimes
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Turbinaria ornata（褐藻纲）的大小和强度各不相同，以维持不同流态下的环境安全系数
DOI：
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发表时间：
2020
影响因子：
2.9
通讯作者：
Nicholas P. Burnett
中科院分区：
文献类型：
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作者：
Nannaphat Sirison;Nicholas P. Burnett
如果大型海藻的组织不够坚固，沿海地区的水流运动会产生水动力，损害或驱逐底栖大型海藻。一些大型藻类改变它们的形态和强度，以响应环境水运动，但鲜为人知的是，大型藻类的形态和强度如何改变相对于另一个跨流态。在这里，我们使用Turbinaria ornata，生态上重要的大型藻类，研究如何形态和强度的大型藻类随环境水运动。通常，T.饰花的菌柄在性成熟时会变弱，导致其脱离基质而分散，这有利于繁殖。在三种流态下，成年T.当水流运动减少时，ornata的大小增加，但强度降低。然而，T. ornata相对于它预计遇到的最大水动力（环境安全系数）的流量在不同的流态之间没有差异。结果表明，T.与其他大型藻类相似，装饰藻类可以通过改变大小和强度来适应其当地的流动栖息地。不同流态下的多个性状表明T. Ornata能够在宽范围的流动条件下存活，这可以允许对它的弱化、从底层破裂和扩散的时间进行更多的控制，甚至在流速未来增加的情况下（例如，风暴产生的大浪），预计将随着气候变化而频繁发生。
Water motion in coastal areas can produce hydrodynamic forces that damage or dislodge benthic macroalgae if the tissues of macroalgae are not sufficiently strong. Some macroalgae vary their morphology and strength in response to ambient water motion, but little is known of how morphology and strength of macroalgae change relative to one another across flow regimes. Here, we use Turbinaria ornata, an ecologically important macroalga, to study how both the morphology and strength of macroalgae vary with ambient water motion. Typically, T. ornata exhibits weakening of its stipe when sexually mature, leading to breakage from the substratum and dispersal, which is beneficial for reproduction. Across three flow regimes, adult T. ornata increased its size but decreased its strength as water motion decreased. However, the strength of T. ornata relative to the maximum hydrodynamic forces it is expected to encounter (the environmental safety factor) did not differ between flow regimes. Our results showed that T. ornata can conform to its local flow habitat by varying both size and strength, similar to other macroalgae. Varying multiple traits between flow regimes suggested that T. ornata is capable of surviving a wide range of flow conditions, which may permit more control over the timing of its weakening, breakage from the substratum, and dispersal, even with future increases in flow velocities (e.g., large waves from storms) that are expected to occur frequently with climate change.