We acknowledge the funding received by G.U. for this study from the Department of Biotechnology (DBT), Govt. of India, vide grant no. BT/PR29032/FCB/125/4/2018. S.M. was supported by a DBT-BINC PhD fellowship from the Govt. of India and an Early Career Grant from the National Geographic Society vide grant no. EC-53199T-18. We are grateful to Dr. Gurdeep Rastogi of the Chilika Development Authority for facilitating the sample collection and for his support throughout the project. We thank Manisha Ray, Divyasree Karne, Madhusmita Mohapatra, and Gopi Krishnan for their help during the sampling expeditions and DNA extraction. We also thank Tulasi Nagabandi of the CCMB NGS facility for her help with the preparation of libraries and sequencing.