Rapid urbanisation has necessitated utilisation of available land to build concrete structures on the city’s outskirts. But it has become a threat to flora and fauna, say conservationists.
The northern side of Avaniapuram tank accommodates smaller waterbodies such as Kilagulam and Samanatham which are frequented by thousands of birds every year. These birds come from the southern districts as they find the marshlands favourable after rains. “More than 65 species of birds were sighted at Avaniapuram tank, Kilagulam and Samanatham tanks in June when the district received rainfall. Large cranes, little grebes, skylarks, herons, moor hens, painted storks and pelicans were sighted,” says Raveendran Natarajan, an avid birdwatcher.
While Avaniapuram tank hosts more than 25 species of migratory birds for about six months every year, Samanatham tank is frequented by many species throughout the year as it always has water. “Treated water from a nearby treatment plant of the civic body is released here and panchayats use the tank to rear fish which is why birds prefer this waterbody with abundant prey,” Mr. Natarajan says.
PollutionThe quality of water in Avaniapuram tank is a matter of concern.
In a study carried out by city-based ‘Naanal Nanbargal,’ the Total Dissolved Solids (TDS) level was found to be 2,000 particles per million, way above contamination level.
“This will affect the groundwater in the surrounding areas and have an impact on the quality of water in Samanatham and Kilagulam tanks,” says Tamil Dasan, a member of ‘Naanal Nanbargal.’ “The ecosystem dependent on the tank will be affected. If pollution levels are kept under check, more migratory birds, even rare ones, will visit the tanks,” he adds.
SolutionsWhile Mr. Raveendran stresses the need for the area to be conserved as a sanctuary, he points out that there are small industries cropping up near the waterbodies. “This will affect the quality of water and contribute to pollution,” he says.
A. Gurunathan, head of Vayalagam movement of Dhan Foundation, says the tanks can be converted into rainwater harvesting structures. “There is also a need to de-centralise sewage treatment plants and ensure that there is six-stage filtration process in place,” he says.