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首页> 外文期刊>Continental Shelf Research: A Companion Journal to Deep-Sea Research and Progress in Oceanography >The potential impact of bedform migration on seagrass communities in Torres Strait, northern Australia
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The potential impact of bedform migration on seagrass communities in Torres Strait, northern Australia

机译：床形迁移对澳大利亚北部托雷斯海峡海草群落的潜在影响

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Seagrass communities in the northwest of Torres Strait are known to disappear episodically over broad areas. Sediment mobility surveys were undertaken within two study areas during the monsoon and trade wind seasons, in the vicinity of Turnagain Island, to find out if the migration of bedforms could explain this disappearance. The two study areas covered sand bank and sand dune environments to compare and contrast their migration characteristics. Repeat multibeam sonar surveys were used to measure dune-crest migration during each season. Our results show that seagrass beds occur in the troughs of sediment-starved dunes, but no seagrass occurs in association with full-bedded dunes that are superimposed on large sand bank features. The coincidence of seagrass beds with the sediment-starved dunes is in spite of the fact that they migrate faster (0.59 m day(-1)) than full-bedded dunes (0.13 m day(-1)), which indicates that some other factor (other than dune migration rate) limits seagrass growth within Torres Strait. We suggest that seagrasses are unable to colonise full-bedded dunes because of the semi-continuously transported sand that characterises this environment. In contrast, the troughs of sediment-starved dunes experience only limited bedload transport and are less hostile for seagrasses. A conceptual model is presented to explain the occurrence of seagrass beds in relation to their proximity to migrating sand dunes. Based on our analysis, we conclude that the widespread dieback of seagrasses documented for the Turnagain Island region was not caused by dune migration. Crown Copyright (c) 2008 Published by Elsevier Ltd. All rights reserved.
机译：众所周知，托雷斯海峡西北部的海草群落在大范围地区逐渐消失。在季恩高岛附近的季风和商风季节，在两个研究区域内进行了泥沙迁移率调查，以了解床形的迁移是否可以解释这种消失。这两个研究区域覆盖了沙丘和沙丘环境，以比较和对比其迁移特征。重复的多束声纳调查用于测量每个季节的沙丘顶迁移。我们的结果表明，海草床出现在缺乏沉积物的沙丘槽中，但是没有海藻与覆盖在大沙洲特征上的全层沙丘一起出现。尽管海草床与沉积物匮乏的沙丘重合，尽管它们的迁移速度（0.59 m day（-1））比全床沙丘（0.13 m day（-1））快，这表明其他因素（沙丘迁移率除外）限制了托雷斯海峡内海草的生长。我们建议，由于这种环境的特征是半连续运输的沙子，海草无法在全沙丘上定殖。相比之下，缺乏沉积物的沙丘槽只能承受有限的床荷运输，并且对海草的抵抗力较小。提出了一个概念模型来解释海草床与迁移沙丘的距离有关的情况。根据我们的分析，我们得出的结论是，Turnagain岛地区广泛记录的海草死亡不是由沙丘迁移引起的。 Crown版权所有（c）2008，由Elsevier Ltd.发行。保留所有权利。

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