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首页> 外文期刊>Estuarine Coastal and Shelf Science >Seasonal variation in the structure of three Mediterranean algal communities in various light conditions
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Seasonal variation in the structure of three Mediterranean algal communities in various light conditions

机译：在不同光照条件下三个地中海藻类群落结构的季节性变化

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Three algal communities subjected to different light conditions were analysed using structure descriptors such as α-diversity (Shannon diversity index), similarity (Kulczynski index), diversity/area and similarity/area curves, the number and size of patches and their spatial distribution (Morisita index). The data used to calculate the structure descriptors were obtained from 20 pictures taken at random in each community in June (Spring) and November (Autumn) to assess seasonal variation. The value of a-diversity was quite similar in all communities. The structural minimal area obtained from the spectra of diversity at increasing areas was higher in the photophilic and the hemisciaphilic communities than in the sciaphilic. Moreover, this area was smaller in November than in June in the three communities. Seasonal variation was also detected for the Kulczynski similarity index in the photophilic and hemisciaphilic communities, with similarity values higher in November than in June, which points to the stronger homogeneity of the communities in November. As for the distribution patterns, the number of species with a clumped distribution decreased from the sciaphilic to the photophilic communities. Species distribution showed seasonal variation in the photophilic and, to a lesser extent, in the hemisciaphilic community. These communities had smaller but more numerous patches in November than in June. It is concluded that most of the used descriptors indicate a higher seasonal variation of community structure in the most illuminated communities (i.e. the photophilic and to a lesser extent the hemisciaphilic communities) than in the least illuminated one (i.e. the sciaphilic).
机译：使用结构描述符（例如α多样性（Shannon多样性指数），相似度（Kulczynski指数），多样性/面积和相似度/面积曲线，斑块的数量和大小及其空间分布（森下指数）。用于计算结构描述符的数据来自6月（春季）和11月（秋季）每个社区随机拍摄的20张照片，以评估季节变化。在所有社区中，a-多样性的价值都非常相似。从亲和性和半亲和性群落中，在增加区域的多样性光谱获得的结构最小面积高于亲亲性。此外，三个社区在11月的面积比6月的面积小。在亲光和嗜血群落中，还发现了库尔琴斯基相似度指数的季节性变化，11月的相似度值高于6月，这表明11月群落的同质性更强。至于分布模式，具有簇状分布的物种的数量从近亲群落减少到亲光群落。物种分布显示出亲光性的季节变化，而半嗜血性社区的变化较小。与6月相比，这些社区在11月份的补丁较小，但数量众多。结论是，大多数使用的描述符表明，在光照最弱的社区（即亲光的，半嗜血的社区）中，群落结构的季节性变化要比光照最弱的社区（即亲社会的）更高。

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