Table 1.

Main bioindicator features (based on [5,6,7,8]).

Bioindicator Number	Bioindicator Features
1	Sufficiently sensitive to provide an early warning of change and relevant to ecologically significant events
2	Distribution over a broad geographical area
3	Applicable on a large scale
4	Attitude of providing a continuous assessment over a wide variety of stress
5	Relatively independent of sample size
6	Easy and cost-effective data collect and analysis
7	Able to differentiate between natural cycles and cycles induced by anthropogenic stress