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首页> 外文期刊>Estuarine Coastal and Shelf Science >Substitution and phase shift within the Posidonia oceanica seagrass meadows of NW Mediterranean Sea
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Substitution and phase shift within the Posidonia oceanica seagrass meadows of NW Mediterranean Sea

机译：地中海西北部波西多尼亚大洋洲海草草甸内的置换和相移

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摘要

We investigated the conservation status and ecosystem substitution in six Posidonia oceanica (L.) Delile meadows in 2002 along 300 km of the Ligurian coast (NW Mediterranean Sea). We studied the meadows by scuba transects and we compared the meadows state of health through in situ shoot density counts and computing the Conservation Index (CI), the latter measuring the proportional amount of dead matte relative to live P. oceanica. Both measures evidenced a generalised state of regression for most of the six meadows. We also reported the occurrence, within the meadows, of the other common Mediterranean seagrass Cymodocea nodosa, the Mediterranean green alga Caulerpa prolifera, and the invasive green algae Caulerpa taxifolia and Caulerpa racemosa. We measured the replacement of P. oceanica by these species using the Substitution Index (SI), related to the proportional cover of each substitutes. These were ranked in order of their colonisation potential with respect to P. oceanica. We identified and measured a community "phase shift" occurring within the Mediterranean seagrass meadows using a combined index, the Phase-Shift Index (PSI). The analysis of the three environmental indices (CI, SI and PSI) at regional scale allowed to introduce three "regional" ordinal scales to classify the conservation status, the degree of substitution and the level of phase shift in P. oceanica meadows.
机译：我们调查了2002年沿着利古里亚海岸（西北地中海）300公里的六个波西多尼亚大洋洲（L.）Delile草地的保护状况和生态系统替代。我们通过水肺横断面研究了草甸，并通过就地芽密度计数和计算养护指数（CI）比较了草甸的健康状况，养护指数（CI）用于测量死角相对于活的海洋假单胞菌的比例。两种方法都证明了六个草甸中大多数的总体回归状态。我们还报告了在草地上发生的其他常见地中海海草Cymodocea nodosa，地中海绿藻Caulerpa prolifera以及侵入性绿藻Caulerpa taxifolia和Caulerpa racemosa。我们使用与每个替代物的比例覆盖率相关的替代指数（SI）测量了这些物种对海洋假单胞菌的替代。根据它们对海洋假单胞菌的定殖潜力对其进行排名。我们使用相移指数（PSI）组合指数，确定并测量了地中海海草草甸内发生的群落“相移”。通过对三个环境指数（CI，SI和PSI）的区域规模分析，可以引入三个“区域”有序尺度，以对海洋草地草甸的保护状况，替代程度和相移水平进行分类。

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