F4 BIOMASS (2)

Biomass in four main natural regions [kg (dry wt.) ha-1]
            South Basin Open water    Archipelago    North Basin Open water    Archipelago
Phytoplankt          0.09                 4.13                3.84                 7.28
Macrophytes         11,000
Zooplankton
 - Copepoda          2.5                  6.9                  8.9
Benthos
 - Mollusca          25.8                 10.6                64.2                 33.6
 - Worms             2.0                  0.8                  8.0                 1.8
 - Insects           0.1                  0.6                  2.1                 1.8

Source: Carmouze, J.-P., Durand, J.-R., & Leveque C. (1983) The lacustrine ecosystem during the "Normal Chad" period and the drying phase. "Lake Chad" (ed. Carmouze, J.-P., Durand, J.-R. & Leveque, C.), pp. 527-560.