Bioindicator Studies (Continued..)

Bioindicator organisms used usually the species are:
1. Regionally well distributed.
2. Sessile- do not move around.
3. Tolerant to pollutant.
4. Show good bioaccumulation potential in relation to size.

Example bioindicator organisms in marine environment:
1. Bivalve. Exm: mussel.
2. Algae.
3. Fishes.

Example of bioindicator organisms in terrestrial environment:
1. Trees.
2. Lichens.
3. Earthworm.

The case of imposex in snail exposed to TBT paint.
1. TBT- tributyltin, usually used in anti-fouling paint in ship.
2. Imposex- the condition where the female change into male because they develope penis. This cause them unable to reproduce. Subsequently, this will disturb the food chain & affect the food chain.
3. Now, use of TBT has been banned as it is very toxic.