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首页> 外文期刊>Marine ecology progress series >Quantifying freshwater-induced fragmentation of submerged aquatic vegetation communities using a multi-scale landscape ecology approach
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Quantifying freshwater-induced fragmentation of submerged aquatic vegetation communities using a multi-scale landscape ecology approach

机译：使用多尺度景观生态学方法量化淡水引起的水下水生植物群落破碎化

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ABSTRACT: Species composition and abundance of nearshore submerged aquatic vegetation (SAV) of Biscayne Bay, Florida, USA, are influenced by pulsed delivery of fresh water from canals that drain the Everglades and adjacent urban and agricultural areas. In the present study, we evaluated whether freshwater inflows were correlated with the spatial structure (e.g. patchiness, fragmentation, spatial heterogeneity) of SAV. SAV patches were delineated using aerial photographs and object-based classification, and the SAV seascape structure was characterized at different spatial scales (200 m to 1 km from shore) using landscape metrics. The area closest to shore (200 m buffer) was identified as the area with the highest heterogeneity in SAV seascape structure; areas beyond this buffer did not differ significantly in landscape metrics. Within the 200 m buffer, SAV seascapes clustered into continuous SAV structures (CSS) and fragmented SAV structures (FSS). CSS had a higher proportion of the benthos covered by larger SAV patches with simpler boundaries. FSS had a higher density of smaller SAV patches with complex shapes and a lower proportion of the substrate covered by SAV patches. Neither structure type was distributed randomly along the shoreline. CSS were prevalent in areas with high and stable salinity. FSS were prevalent in areas influenced by freshwater discharges where salinity is low and variable, highlighting how the pulsed release of fresh water may adversely influence the structure of SAV seascapes, potentially resulting in fragmentation of the benthic community. Thus, this seascape approach provides a tool to assess the influences and effectiveness of the ­Everglades Restoration Project in Biscayne Bay.
机译：摘要：美国佛罗里达州比斯坎湾的近岸水下水生植物（SAV）的种类组成和丰富度受到从大沼泽地及邻近城市和农业地区排水的运河脉冲淡水的脉冲输送的影响。在本研究中，我们评估了淡水的流入量是否与SAV的空间结构（例如斑驳，破碎，空间异质性）相关。使用航拍照片和基于对象的分类来划定SAV斑块，并使用景观度量在不同的空间尺度（距海岸200 m至1 km）上表征SAV海景结构。最接近海岸的区域（200 m缓冲区）被确定为SAV海景结构中异质性最高的区域。超出此缓冲区的区域在景观指标上没有显着差异。在200 m缓冲区内，SAV海景聚集为连续的SAV结构（CSS）和碎片化的SAV结构（FSS）。 CSS的底栖动物中，较大的SAV斑块覆盖的比例较高，边界更简单。 FSS具有形状复杂的较小SAV贴片的较高密度，并且SAV贴片覆盖的基板比例较低。两种结构类型均未沿海岸线随机分布。 CSS在盐度高且稳定的地区普遍存在。 FSS在盐度低且变化多端的受淡水排放影响的地区普遍存在，这突显了淡水的脉冲释放如何可能会对SAV海景的结构产生不利影响，并可能导致底栖生物群落破碎化。因此，这种海景方法为评估比斯坎湾大沼泽地修复项目的影响和效果提供了一种工具。

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