By Ann E. McKellar Linked Paper: Weak genetic structure, shared nonbreeding areas, and extensive movement in a declining waterbird by Nicholas G. Shephard, Patricia Szczys, David J. Moore, Matthew W. Reudink, Jeffrey N. Costa, Annie M. Bracey, Simeon Lisovski, and Ann E. McKellar, Ornithological Applications. The Black Tern (Chlidonias niger) is a species of concern in …