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首页> 外文期刊>Estuarine Coastal and Shelf Science >Spatial scale and the detection of impacts on the seagrass Posidonia australis following pier construction in an embayment in southeastern Australia
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Spatial scale and the detection of impacts on the seagrass Posidonia australis following pier construction in an embayment in southeastern Australia

机译：澳大利亚东南部某码头的码头建造后的空间规模和对海草波氏脊灰的影响的检测

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摘要

Coastal development can impact on ecologically significant seagrasses. We sought to determine whether the construction of a pier and associated boat launching facilities would impact on Posidonia australis within Jervis Bay Marine Park, New South Wales, Australia. Using a modified 'beyond BACI' analysis we tested for impacts at three spatial scales; directly beneath the pier deck, within metres of the pier and approximately 50 m from the construction zone. We compared shoot density, leaf length and epiphytic cover prior to the commencement of construction to 7 months and 46 months later. Impacts were highly localised; we detected significant seagrass loss directly below the open-mesh deck of the pier, but not at the scale of metres and tens of metres relative to two non-impacted reference locations. Our data also supported the use of the trigger point approach to initiate management intervention; shoot density beneath of the deck of the pier fell below the 30th per-centile, ending 73% lower than the mean after 46 months. If similar developments occur in waterways supporting seagrass species of high conservation significance, then management agencies need to weigh the inevitable loss of a small area of meadow with the advantages the development will provide.
机译：沿海开发会影响具有生态意义的海草。我们试图确定码头的建造和相关的下船设施是否会影响澳大利亚新南威尔士州杰维斯湾海洋公园内的波塞冬菌。使用改良的“超越BACI”分析，我们在三个空间尺度上测试了影响。在码头甲板的正下方，距离码头数米的范围内，距施工区约50 m。我们比较了开始施工之前与7个月和46个月之后的枝条密度，叶片长度和附生覆盖率。影响高度局部化；我们在码头的网眼正下方直接检测到了明显的海草损失，但相对于两个未受影响的参考位置，却没有达到米和数十米的规模。我们的数据还支持使用触发点方法来发起管理干预。码头甲板下方的笋密度低于30个百分位，比46个月后的平均值低73％。如果在支持具有高度保护意义的海草物种的水道中发生类似的发展，那么管理机构需要权衡一小块草地不可避免的损失，以及发展将提供的优势。

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