Seasonal implications for taxonomic sufficiency to simplify M-AMBI methodology in the coastal area adjacent to a eutrophic estuary
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Abstract: Taxonomic sufficiency (TS) refers to identifying taxa to a taxonomic level sufficient to detect community changes in stressed environments and may provide a cost-effective approach in routine monitoring programs. However, there is still limited information regarding the seasonal impact of applying TS and its implications for the ecological quality evaluation in the estuarine ecosystem. This study investigated the relationship between the multivariate-AZTI’s Marine Biotic Index (M-AMBI) and environmental variables in three seasons (i.e., spring, summer, and autumn) in the Liaohe River Estuary. We tested the reliability of TS for simplifying the M-AMBI methodology. The results showed that family and genus level data could reproduce the spatial-temporal patterns of community structure at the species level. The M-AMBI values showed a consistent spatial distribution pattern in all sampling seasons, with a decreasing trend with the increasing distance from the estuary mouth. Both genus and family level data performed nearly as well as species level in detecting the seasonal variations of pollutants (i.e., nutrients and total organic content). The family level M-AMBI was feasible to discern stress in the Liaohe River Estuary because of the high aggregation ratios at different taxonomic levels in all sampling seasons. These findings suggest that applying taxonomic sufficiency based on the M-AMBI provides an efficient approach for evaluating ecological quality in the Liaohe River Estuary.
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Key words:
- M-AMBI /
- ecological quality /
- macrofauna /
- taxonomic sufficiency /
- eutrophication /
- Liaohe River Estuary
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Figure 2. Spatial-temporal distribution of environmental variables (Chl-a: Chlorophyll a concentration; COD: chemical oxygen demand concentration; TOC: total organic carbon content; PHc: petroleum hydrocarbons content) in the Liaohe River Estuary. The stations were divided into six categories based on the distance from the station to the river inlet (A: Nos S1–S2; B: Nos S3–S6; C: Nos S7–S10; D: Nos S11–S15; E: Nos S16–S20; F: Nos S21–S25).
Table 1. Summary of family, genus, species counts, aggregation ratio (
$\phi $ ) for higher taxonomic resolutions, and dominant species in three seasons. Ecological groups assigned to dominant species are presented in the parenthesisSeason Family ($\phi $) Genus ($\phi $) Species Dominant species (Ecological Group) Spring 45 (0.80) 48 (0.86) 56 Potamocorbula ustulata (V) Ampelisca sp. (I) Summer 47 (0.80) 58 (0.98) 59 Potamocorbula laevis (V) Capitella capitata (V) Autumn 45 (0.85) 47 (0.89) 53 Corophium acherusicum (III) Grandidierella sp. (I) Amphioplus sp. (I) Capitella capitata (V) Potamocorbula laevis (V) Glossaulax didyma (I) Table 2. Number of stations for each ecological quality (EcoQ) classification using the M-AMBI calculated with aggregated datasets
EcoQ
classificationAggregation level Species Genus Family High 7 7 9 Good 31 30 29 Moderate 10 10 12 Poor 13 14 12 Bad 5 5 4 Total 66 66 66 Note: Standard EcoQ classification boundaries used; for status, High, $\geqslant $0.77; Good, [0.53, 0.77); Moderate, [0.39, 0.53); Poor, [0.20, 0.39); Bad, <0.20. -
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