Ecosystems and Energy Flow — BIOLOGY STD 12 Science — Question

There are four zones in wetland, viz. subtidal channels, mudflats, low marsh and high marsh. High marsh is more in terrestrial ecosystem while the subtidal channels are more of aquatic nature.

1. Subtidal channels : These are important habitat for fish during low tide. This region allows good drainage and flooding in mudflats.
2. Mudflats : This area is very rich in invertebrate life. Therefore, many wading birds are dependent for food in this area. Algal mat is also observed on mud flats.
3. Low marsh : This area is a good habitat for cordgrass, insects, herons and egrets and the clapper rails.
4. High marsh : This region supports pickleweed and patches of cordgrass. Sparrow and clapper rails are seen here.