Seagrass macrofaunal abundance shows both multifractality and scale-invariant patchiness.
Seagrass macrofaunal abundance shows both multifractality and scale-invariant patchiness.
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海草大型动物丰富度表现出多重分形性和尺度不变的斑块性。
DOI：
10.1016/j.marenvres.2018.04.009
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发表时间：
2018
影响因子：
3.3
通讯作者：
H. Laurie
中科院分区：
文献类型：
--
作者：
Richard Barnes;Richard Barnes;H. Laurie
在亚热带昆士兰州的莫尔顿湾，整个大型底栖动物组合和它的10个最众多的物种的丰富的空间格局进行了检查跨层次嵌套尺度内的0.85公顷的潮间带海草。多重分形特征的组合和所有10个优势种跨越这些规模（c.33，130，530和2115平方米），与斑块的组合数和那些至少有一些优势表现出规模不变性。该系统显示了几个丰度峰值，12%的站点占总方差的88%，许多个体优势显示了一系列不重叠的“热点”。规模不变性和multifractality发生尽管低水平的物种间的相互作用，从而在非常低的密度维护。这表明，批判性的自我组织不能对这种模式负责。与公认的智慧相反，泰勒幂律系数β不能形成聚集指数，尽管它确实指示了分散模式随数字变化的方向。
Spatial patterns of abundance of the whole macrobenthic assemblage and of its 10 most numerous species were examined across hierarchically nested scales within a 0.85 ha area of intertidal seagrass in subtropical Moreton Bay, Queensland. Multifractality characterised the assemblage and all ten dominant species across those scales (c.33, 130, 530 & 2115 m2), with patchiness of assemblage numbers and those of at least some dominants exhibiting scale-invariance. The system displayed several abundance peaks, 12% of stations accounting for 88% of total variance, with many individual dominants showing a series of non-overlapping 'hot-spots'. Scale invariance and multifractality occurred notwithstanding low levels of species interaction consequent on maintenance at very low density. This suggests that critical self-organisation cannot be responsible for such patterning. Contrary to received wisdom, coefficientβof Taylor's power-law cannot form an index of aggregation, although it does indicate direction of change in dispersion pattern with changing numbers.