The that are too thick to be

The marine biotic communities can be studied separately for different life zones of the ocean as follows: 1. Biotic communities of oceanic region: The oceanic region or pelagic zone is less rich in species and numbers than the coastal areas, but it has its characteristic species. Many of these are Read more…

Density per cent; E = 81-100 per

Density gives an idea of competition. If density is more, it means there is more degree of competition between the indivi­duals of the species. Density is expressed as number of individuals per unit area and is calculated as follows: Density = Total number of individuals of the species in all Read more…

The cooled below + 4°C. Ice also

The rise and fall of these factors very frequently affect the fauna, altering their number and diversity. Some of the important factors of fresh-water environ­ment are following: Pressure, Density and Buoyancy: The pressure imposed on a lake-dwelling organism is the weight of the column of water above it plus the Read more…


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