River Tern In Rajaji National Park
River Tern In Rajaji National Park
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                      River Tern ( Sterna aurantia ) has been up listed to near threatened category because increasing human disturbance and dam construction projects are expected to result in a moderately rapid population decline over the next three generations .

Field Characters :  Medium sized River Tern is  approx 32 centimeter long with dark grey upper parts , white under parts , the deeply forked tail with long flexible reamers and long pointed wings , yellow legs and yellow orange bill , diagnostics inbreeding bloomers. It has a yellowish Bill with black tip , red legs and black cap . Both  sexes are similar but juveniles have a brown head brown mark , white under parts.River Tern In Rajaji National Park

Distribution: The River Tern is a common widespread resident of most of peninsula and north India besides the Indian subcontinent, it is distributed in much of south east Asia .

In Uttarakhand the River Tern was commonly reported from the Ganga and Yamuna rivers, where it bread in large numbers on Sandy islands in Dehradun district , Presently intermittently seen on these large rivers as well as on the series of wetlands ,in the foothills which was created post independence in the 1950 to 1970 for hydroelectric and irrigation projects ,these include Asan barrage,  Bhimgoda barrage in Rajaji National Park, However no evidence of breeding has been noticed on the Ganga and Yamuna in recent times, perhaps going to construction of dams and reservoir on the two rivers is the potential breeding areas, it inhibits rivers and freshwater lakes also ,occurring rarely on estuaries and fields predominantly on insects.

Breeding occurs mainly in colonies in less accessible areas, such as islands and sandy banks in river in summer .

It nests a scrape on the ground open on bare rock or sand and lays three greenish grey to buff eggs which are blotched and streaked with brown.

Usually River tern are seen in groups of 10 to 12 but in almost all that land areas, threads nesting areas are vulnerable to flooding irrigation and other disturbances in addition the harvesting of sand and builders from large river create a continuous disturbance in the potential breeding.
 

 

 

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