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首页> 外文期刊>Estuarine Coastal and Shelf Science >Recreating the shading effects of ship wake induced turbidity to test acclimation responses in the seagrass Thalassia hemprichii
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Recreating the shading effects of ship wake induced turbidity to test acclimation responses in the seagrass Thalassia hemprichii

机译：重现船尾诱发浑浊的阴影效应以测试海草Thalasia hemprichii的驯化响应

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摘要

Elevated sediment delivery and resuspension in coastal waters from human activities such as shipping can have detrimental effects on seagrass health by limiting light penetration. Managing seagrasses requires knowledge of their light acclamatory abilities so guidelines for coastal activities (e.g. ship movements) that influence sediment dynamics can be created. Guidelines typically focus on ensuring that seagrasses are able to meet their minimal light requirements (MLR). MLRs can be achieved by different light regimes, but it remains unknown whether a chronically low yet stable light regime is less or more detrimental than a highly variable regime with periods of extreme low to no light. To test this, we compared the physiological and morphological responses of Thalassia hemprichii among three light regimes: an open control (30-40% ambient light), a shaded control with (11-15% ambient light), and a fluctuating shade (4-30% ambient light). The MLR for the T. hemprichii we studied was lower (4-10% ambient light) than previous reports (mean = 18%) illustrating enhanced light acclimation in Singapore's chronically turbid waters. Seagrass shoots in the shaded control, however, exhibited significantly more morphological stress symptoms, with reduced shoot growth and lower below ground biomass. These data suggest that for seagrass exposed to periods of acute light stress, energetic costs associated with photo-acclimation to more variable light regimes can be offset If the plant can meet its daily light requirements during periods of high light. Management of seagrass beds should incorporate regular light monitoring and move towards an adaptive feedback-based approach to ensure the long-term viability of these vulnerable ecosystems. (C) 2017 Elsevier Ltd. All rights reserved.
机译：人类活动（例如运输）在沿海水域增加的沉积物输送和重悬可能会限制光的穿透，从而对海草健康产生不利影响。管理海草需要了解它们的光吸收能力，因此可以制定影响沉积物动力学的沿海活动（例如，船舶运动）的准则。准则通常着重于确保海草能够满足其最低限度的光照要求（MLR）。 MLR可以通过不同的光照方案来实现，但尚不清楚长期低而稳定的光照方案是否比周期极低甚至没有光照的高度可变方案更少或更有害。为了测试这一点，我们在三种光照条件下比较了Thalsia hemprichii的Thalsia hemprichii的生理和形态反应：开放控制（环境光为30-40％），有阴影的环境（环境光为11-15％）和波动的阴影（4 -30％的环境光）。我们研究过的T. hemprichii的MLR（4-10％的环境光）比以前的报告（平均值= 18％）低，这说明新加坡的慢性浑浊水域的光适应性增强。但是，在阴凉处，海草枝条表现出明显更多的形态胁迫症状，枝条生长减少且地下生物量较低。这些数据表明，如果植物可以在强光照射期间满足其日常的光照需求，则可以抵消对于暴露于急性光照胁迫期间的海草而言，与光适应更多可变光照方案相关的能源成本。海草床的管理应纳入定期的光照监测，并采取基于反馈的自适应方法，以确保这些脆弱生态系统的长期生存能力。 （C）2017 Elsevier Ltd.保留所有权利。

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