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Shoot micro-distribution patterns in the Mediterranean seagrass Posidonia oceanica

机译：拍摄地中海海草波塞冬海洋中的微分布模式

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Posidonia oceanica meadows host a huge number of shoots and their dynamics is strictly related to the spatial distribution patterns of those shoots. To investigate the structure of P. oceanica meadows at very small spatial scale (i.e. in the 10(0)-10(2) cm range), point patterns of shoot micro-distribution were analyzed. Spatial distribution of shoots was recorded by cutting all the leaves and by digitizing shoot location from pictures of square frames (1 m(2)) that were randomly positioned in seemingly uniformly dense stands. Ten frames were sampled, all from Southern Italian meadows, and the position of 7828 shoots was recorded. Nearest neighbour distance (NNd) statistics revealed recurring patterns at the different spatial scales: regular patterns were recognized among shoots at smaller spatial scale (10(0)-10(1) cm), while aggregated shoot distribution emerged in the 10(1)-10(2) cm range and an important stochastic component was observed at larger spatial scales. Reasons underpinning different spatial point patterns in P. oceanica meadows were discussed by relating the observed patterns to ecological processes (i.e. competition among shoots, role of "species-specific" drivers or "site-specific" features), also including relationships between shoot NNd and shoot density counts. The raw data, provided as supplementary material, are currently the first and the only source of information available about shoot spatial micro-distribution. In this regard, although our data set cannot represent the whole spectrum of variability in P. oceanica meadows, it can be regarded as a first step towards a better knowledge of small scale shoot point patterns in P. oceanica meadows.
机译：大洋波西多尼亚草地上有许多新芽，它们的动态与这些新芽的空间分布模式密切相关。为了调查非常小的空间尺度上（即10（0）-10（2）cm范围内）的海洋体育草地的结构，分析了茎微分布的点型。通过切下所有叶子并通过将正方形位置（1 m（2））的图片数字化拍摄位置来记录新芽的空间分布，这些图片随机放置在看似均匀的密林中。从意大利南部的草地上采样了十个帧，并记录了7828个芽的位置。最近邻距离（NNd）统计数据揭示了不同空间尺度上的重复模式：在较小空间尺度（10（0）-10（1）cm）的新芽中识别出规律的模式，而10（1）中出现了聚集的新芽分布-10（2）cm范围和较大的空间尺度上观察到重要的随机成分。通过将观测到的格局与生态过程（即枝条之间的竞争，“物种特定”驱动力的作用或“地点特定”的特征）相关联，还包括枝条NNd之间的关系，讨论了海洋运动草地不同空间点格局背后的原因。和芽密度计数。作为补充材料提供的原始数据是当前有关枝条空间微分布的第一个也是唯一的信息来源。在这方面，尽管我们的数据集不能代表大洋云杉草甸的整个变化范围，但它可以被视为迈向更好地了解大洋云杉草甸小尺度射击点模式的第一步。

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  • 来源
    《Marine biology》 |2017年第4期|85.1-85.11|共11页
  • 作者

    Bacci Tiziano; Rende Francesco Sante; Scardi Michele;

  • 作者单位

    ISPRA Inst Environm Protect & Res, Rome, Italy;

    ISPRA Inst Environm Protect & Res, Rome, Italy;

    Univ Roma Tor Vergata, Dept Biol, Rome, Italy;

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