Comparison of EBQI with Ecological Quality Ratios (EQRs) based mainly upon P. oceanica (the organism itself) and aimed at establishing the ecological status of the seawater body.

aThe metrics of PREI are: shoot density, shoot leaf surface area, ratio between epibiota biomass and leaf biomass, depth of the lower limit and type of this limit [14].bThe metrics of POMI are: shoot density, meadow cover, percentage of plagiotropic rhizomes, shoot leaf surface area, percentage of foliar necrosis, P, N and sucrose content in rhizomes, δ15N and δ34S isotopic ratio in rhizomes, N content in epiphytes, Cu, Pb and Zn content in rhizomes [12].cThe metrics of BiPo are: shoot density, shoot leaf surface area, lower depth limit and lower limit type [15].PREI, POMI and BiPo indices are based upon distinct but similar metrics and range from 0 (lowest ecological status) to 1 (highest ecological status).a. PREI的评估指标包括：分株密度、单株叶片表面积、附生生物生物量与叶片生物量之比、下限深度以及该下限的类型[14]。 b. POMI的评估指标包括：分株密度、草甸盖度、匍匐根茎占比、单株叶片表面积、叶片坏死率、根茎中的磷（P）、氮（N）与蔗糖含量、根茎中的δ15N与δ34S同位素比值、附生生物的氮含量，以及根茎中的铜（Cu）、铅（Pb）与锌（Zn）含量[12]。 c. BiPo的评估指标包括：分株密度、单株叶片表面积、下限深度以及下限类型[15]。 PREI、POMI与BiPo指数均基于虽有差异但性质相近的指标构建，取值范围为0（生态状况最差）至1（生态状况最优）。