红柱石床架和底层沉积物极易受到持续海洋气候变化的影响

IF 2.5 3区 环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES
Aidan Hicks, Kyle R. Millar, Patrick Gagnon
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引用次数: 0

摘要

红藻是一种非基因型、自由生活的珊瑚红藻,可在海底堆积,形成结构复杂的栖息地,支持高度生物多样性的群落,被称为红藻床。由于对红藻的关键动力学属性及其如何随环境变化而变化的了解有限,限制了预测全球海洋气候变化下红藻床分布和丰度变化的能力。我们在振荡波浪槽中进行了两次实验,以测试:(1) 在坚硬的底质上,菱锰矿(Boreolithothamnion glaciale)密度和波速对菱锰矿位移和磨损的影响;(2) 菱锰矿密度对菱锰矿位移和底层沉积物稳定性的影响。我们确定,在坚硬的基底上,(1) 需要约 0.3 m s-1 的临界波速才能引起平均大小的红柱石发生明显的位移;(2) 在达到这个临界值时,红柱石的磨损随波速的增加而增加(近似线性)。我们还发现:(3) 在相同的红石密度下,沉积基底上的红石位移比坚硬基底上的红石位移至少小两倍;(4) 随着红石密度的增加,红石下沉积物的流失也会减少(近似线性)。所记录的速率以及与水流和菱铁矿密度变化的强烈比例关系表明,菱铁矿密度或水动力的相对较小变化就能迅速破坏菱铁矿床架和底层沉积物的稳定。这些速率可用于建立红石床分布和丰度变化的预测模型,进而为制定更准确、更科学的红石床保护战略提供信息。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
High Vulnerability of Rhodolith Bed Frameworks and Underlying Sediment to Ongoing Ocean Climate Change

Rhodoliths are non-geniculate, free-living coralline red algae that can accumulate on the seafloor and form structurally complex habitats supporting highly biodiverse communities termed rhodolith beds. Limited understanding of key rhodolith kinetical attributes and how they scale with environmental variability limits ability to predict changes in rhodolith bed distribution and abundance in a globally changing ocean climate. We carried out two experiments in an oscillatory wave tank to test the effects of (1) rhodolith (Boreolithothamnion glaciale) density and wave velocity on rhodolith displacement and abrasion over a hard substratum and (2) rhodolith density on rhodolith displacement and the stability of underlying sediment. We established that on a hard substratum, (1) a threshold wave velocity of ~0.3 m s−1 is required to induce noticeable displacement in average-sized rhodoliths and (2) rhodolith abrasion increases (quasi-linearly) with wave velocity up to this threshold. We also showed that (3) for a same rhodolith density, rhodolith displacement is at least two times smaller on a sedimentary than hard substratum and (4) the loss of sediment underneath rhodoliths decreases (quasi-linearly) with an increase in rhodolith density. Rates documented and strong scaling with changes in water motion and rhodolith density indicate that relatively small changes in the density of rhodoliths or hydrodynamic forces can quickly destabilize rhodolith bed frameworks and underlying sediment. These rates can be used to develop predictive models of change in rhodolith bed distribution and abundance that can in turn inform development of more accurate, science-based rhodolith bed conservation strategies.

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来源期刊
Aquatic Conservation-Marine and Freshwater Ecosystems
Aquatic Conservation-Marine and Freshwater Ecosystems 环境科学-海洋与淡水生物学
CiteScore
5.50
自引率
4.20%
发文量
143
审稿时长
18-36 weeks
期刊介绍: Aquatic Conservation: Marine and Freshwater Ecosystems is an international journal dedicated to publishing original papers that relate specifically to freshwater, brackish or marine habitats and encouraging work that spans these ecosystems. This journal provides a forum in which all aspects of the conservation of aquatic biological resources can be presented and discussed, enabling greater cooperation and efficiency in solving problems in aquatic resource conservation.
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