Are there "endemic" meiofauna in hadal zone?: Special changes inmeiofaunal community structure around trench regions

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The community compositions of harpacticoid copepods were studiedquantitatively around and within the Kuril Trench (490-7090 m) and the Ryukyu Trench(594-7150 m). Those compositions changed with water depth in both areas. Whileharpacticoid communities in shallower continental slopes in the two regions were similareach other, a lower similarity was detected between communities in the trench regions,which suggests those communities in trenches are isolated because of difficulties inmigration beyond bathymetric barriers such as island arcs.