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Morisita's index of patchiness and edge effects: A response to Butturi-Gomes and Petrere (2020)
Ecological Indicators ( IF 6.9 ) Pub Date : 2020-06-29 , DOI: 10.1016/j.ecolind.2020.106648
R.S.K. Barnes

In a recent paper in Ecological Indicators, Butturi-Gomes and Petrere (2020) investigated Morisita's index of patchiness in relation to edge effects and concluded: that edge avoidance by a species drives its patchiness estimationwhich might be the reason behind so many claims of population aggregation' and that 'the presence of edge avoidance leads to false claims of population aggregation, based solely on Morisita's patchiness index. One of the patchiness 'claims' that they specifically criticised was that of Barnes and Laurie (2018) for intertidal seagrass macrobenthos, Butturi-Gomes and Petrere stating that these authors: disregarded possible edges, which are indeed hard to define in marine environments, but are still of importance, particularly in seagrass substrates, as Smith et al. (2008) pointed out. What Butturi-Gomes and Petrere failed to mention, however, was (a) that Barnes and Laurie did not use Morisita's patchiness index, (b) that the index they did use was not the sole basis for their finding of patchiness, and (c) that they cited extensive previous work at their site that had investigated seagrass edge effects — indeed, rather than ignoring such edges they specifically sited their study area within a non-edge zone (sensu Smith et al., 2008). The patchiness they observed was not 'false' and it was not driven by active aggregation away from edges but most likely by the effect of predation by mobile nekton on prey densities.



中文翻译:

森田的斑驳和边缘效应指数:对Butturi-Gomes和Petrere(2020)的回应

Butturi-Gomes和Petrere(2020)在最近的一篇《生态指标》中的论文中,研究了森田的边缘效应相关的斑块性指数,并得出结论:物种避开边缘会导致其斑块性估计……这可能是许多人主张保护性的原因。人口聚集”,而“避免边缘化的存在导致仅基于森田的斑驳指数就对人口聚集提出了错误的主张”。他们特别批评的零星``主张''之一是Barnes and Laurie(2018)关于潮间带海草大底栖动物的说法,Butturi-Gomes和Petrere指出这些作者:忽略了可能的边缘,这些边缘在海洋环境中确实很难定义,但是仍然很重要,特别是在海草基质中,如Smith等人所述。(2008)指出。但是,Butturi-Gomes和Petrere没有提及的是(a)Barnes和Laurie没有使用Morisita的斑驳指数,(b)他们使用的索引并不是发现斑驳的唯一依据,并且(c ),他们引用了之前在其研究海草边缘效应的工作场所所做的大量工作–实际上,他们没有忽略这样的边缘,而是将研究区域专门定位在非边缘区域内(sensu Smith等,2008)。他们观察到的斑块不是“假的”,不是由主动聚集远离边缘驱动的,而是由移动性神经网络对猎物密度的捕食作用所驱动的。

更新日期:2020-06-29
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