Does the Existence of Bird's Nest Ferns Enhance the Diversity of Oribatid (Acari: Oribatida) Communities in a Subtropical Forest?
Does the Existence of Bird's Nest Ferns Enhance the Diversity of Oribatid (Acari: Oribatida) Communities in a Subtropical Forest?
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DOI：
10.1007/s10531-005-5443-4
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发表时间：
2006-07
影响因子：
3.4
通讯作者：
S. Karasawa;N. Hijii
中科院分区：
文献类型：
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作者：
S. Karasawa;N. Hijii
在日本西南部的亚热带森林中，我们研究了鸟巢蕨类植物的存在对整个森林中甲螨物种多样性的影响，包括三种类型的物种多样性（α-，β-和γ-多样性）。蕨类植物中甲螨群落的物种多样性（1-D）显著低于树皮、枯枝落叶层和土壤，与树枝中甲螨群落的物种多样性相似。蕨类植物的凋落物和根中甲螨的区系与林下凋落物和土壤中甲螨的区系更为相似，而与其他乔木生境中甲螨的区系则更为相似。然而，蕨类植物可以由专门适应这种环境的特有甲螨物种定殖。甲螨物种的数量估计为一个假设的立场没有蕨类植物约180种，从80个样本，这个值没有显着差异，在另一个假设的立场与蕨类植物（约190种）。因此，整个森林的甲螨群落的物种丰富度（γ多样性）不受鸟巢蕨类植物的存在或不存在的影响。鸟巢蕨上甲螨群落的α-和β-多样性低于其他生境，但对整个森林无脊椎动物群落的γ-多样性的提高并不显著。然而，鸟巢蕨可以为特定物种提供独特的栖息地，这将有助于维持亚热带森林全林尺度上无脊椎动物的物种多样性。
We examined the effects of the presence of bird's nest ferns on the species diversity of oribatid mites in the whole forest in terms of the three categories of species diversity (α-, β-, and γ-diversity) in a subtropical forest in south-western Japan. The species diversity (1 −D) of oribatid communities in the ferns was significantly lower than those in bark of trees and the forest-floor litter and soil, and was similar to that in the branches. The oribatid faunas in the litter in and the roots of the fern were more similar to those in both the forest-floor litter and soil than to the faunas in the other arboreal habitats. However, the ferns can be colonized by endemic oribatid species specialized to such environments. The number of oribatid species estimated for a hypothetical stand with no ferns was about 180 species from 80 samples; this value did not differ significantly from that in another hypothetical stand with ferns (ca. 190 species). Thus, the species richness of oribatid communities estimated for the whole forest (the γ-diversity) was not affected by the presence or absence of bird's nest ferns. The α- and β-diversities of oribatid communities on bird's nest ferns were lower than those in other habitats, and they might not dramatically raise the overall γ-diversity of invertebrate communities in the whole forest. The bird's nest ferns, however, can generate a unique habitat for specialized species, and this would help to maintain species diversities of invertebrates at the whole-forest scale in subtropical forests.