Vol. 3, Issue 2, Part F (2017)

Abstract
An ecosystem is a dynamic complex of plant, animal, and microorganism communities and the nonliving environment, interacting as a functional unit. A pond is a quiet body of water that is too small for wave action and too shallow for major temperature differences from top to bottom. It usually has a muddy or silty bottom with aquatic plants around the edges and throughout. Ponds are habitats of great human importance as they provide water for domestic, industrial and agricultural use as well as providing food. In spite of their fundamental importance to humans, freshwater systems have been severely affected by a multitude of anthropogenic disturbances, which have led to serious negative effects on the structure and function of these ecosystems. The biodiversity of lake and pond ecosystems is currently threatened by a number of human disturbances, of which the most important include increased nutrient load, contamination, acid rain and invasion of exotic species. New threats such as global warming, ultraviolet radiation, and invasion by exotic species including transgenic organisms will most likely increase in importance. The aim of the present study is to analyses the current state of three pond ecosystems which are mostly affected by anthropogenic activities like environmental pollution, conversion of ponds into flats (Real Estate) etc. Within five years (2010-2015) the area of the ponds are greatly reduced. The number of producers, consumers and decomposers is also decreased during five years due to the anthropogenic activities. To preserve the ponds and its ecosystems, concern environmental programmes and implementation of new environmental strategies and administrations should be carried out.