tristan cordier edited this page May 18, 2018 · 30 revisions

Welcome to the BBI wiki

The biotic indices included in this package are:

AMBI (Borja et al., 2000)

formula : AMBI = [(0xGI)+(1.5xGII)+(3xGIII)+(4.5xGIV)+(6xGV)] / 100

where GI - GV are the relative abundance of all taxa belonging to respective ecological groups.

The ecological quality status are defined:
0 < AMBI < 1.2 = very good
1.2 < AMBI < 3.3 = good
3.3 < AMBI < 4.3 = moderate
4.3 < AMBI < 5.5 = bad
5.5 < AMBI < 6 = very bad

ISI 2012 (Rygg 2002)

formula : ISI = ∑ws / Ns

where w is the ecological weight of the taxa s, and N is the number of taxa with an ISI weight in the sample.

The ecological quality status are defined:
0 < ISI < 4.5 = very good
4.5 < ISI < 6.1 = good
6.1 < ISI < 7.5 = moderate
7.5 < ISI < 9.6 = bad
9.6 < ISI < 13 = very bad

NSI (Rygg & Norling, 2013)

formula : NSI = ∑aws / TotA

where a is the abundance, w is the sensitivity value of the taxa s, and TotA is the total abundance of taxa with a sensitivity value present in the sample.

The ecological quality status are defined:
0 < ISI < 4.5 = very bad
4.5 < ISI < 6.1 = bad
6.1 < ISI < 7.5 = moderate
7.5 < ISI < 9.6 = good
9.6 < ISI < 13 = very good

NQI1 (Rygg & Norling, 2013)

formula : NQI1 = 0.5x(1-AMBI/7)+0.5[log(Sambi)/log(log(∑Nambi))]/2.7 x ∑Nambi / (∑Nambi + 5)

where AMBI is the AMBI index value for the sample, Sambi is the number of taxa with an ecological group, Nambi is the total abundance of taxa with an ecological group.

The ecological quality status are defined:
0 < NQI1 < 0.31 = very bad
0.31 < NQI1 < 0.49 = bad
0.49 < NQI1 < 0.63 = moderate
0.63 < NQI1 < 0.82 = good
0.82 < NQI1 < 1 = very good

BENTIX

formula : BENTIX = [(6xGI)+2x(GII+GIII)] / 100

where GI - GIII are the relative abundance of all taxa belonging to respective ecological groups.

The ecological quality status are defined:
0 < BENTIX < 2 = very bad
2 < BENTIX < 2.5 = bad
2.5 < BENTIX < 3.5 = moderate
3.5 < BENTIX < 4.5 = good
4.5 < BENTIX < 6 = very good

References

Borja, A., Franco, J., Pérez, V., 2000. A Marine Biotic Index to Establish the Ecological Quality of Soft-Bottom Benthos Within European Estuarine and Coastal Environments. Marine Pollution Bulletin PDF

Rygg, B., 2013. Norwegian Sensitivity Index (NSI) for marine macroinvertebrates, and an update of Indicator Species Index (ISI). Norwegian Institute for Water Research PDF

Rygg, B., 2002. Indicator species index for assessing benthic ecological quality in marine waters of Norway. Norwegian Institute for Water Research

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