Least Tern breeding colonies that contain >1% of the total inland Least Tern breeding population can qualify as a separate IBA. In Tennessee, the site must meet this requirement 4 out of the last 5 years (2001-2005). Nebraska Point Dikes (Upper and Lower) are part of the IBA site, Mississippi Alluvial Valley in Tennessee.
Surveys: Interior Least Tern surveys have been conducted since 1985 by the Memphis District Army Corps of Engineers. In the period 2001-2005, a small boat survey technique was used to census the birds. Upon spotting a likely colony, terns were counted in the air and on the land from the boat as it drifted downstream. After this preliminary count, the site was usually surveyed on foot to count adults, nests, eggs, and chicks. (Jones 2005).
Nest site of inland race of Least Tern, a Tennessee and Federal Endangered species, containing >1% of the total inland Least Tern population for that year.