Glenn D. Therres

Reintroductions of Delmarva fox squirrels (Sciurus niger cinereus) to suitable habitat have been a recovery tool used for this endangered species. In Maryland, we attempted reintroductions at 11 sites beginning in 1978. The last reintroduction was completed in 1992. At each site, 8-42 individuals were released during spring or fall over a 1-3 year period. Attempts were made to release an equal number of males and females. Monitoring at reintroduction sites by live-trapping has documented recruitment and establishment of populations at 9 sites. Criteria used for determining population...

We evaluated the proximity to development of 2 representative groups of colonial waterbirds present in Maryland's coastal plain, active in 1985 through 1988, to determine the influence of land and water development on the distribution of waterbird nest sites. Thirty of 38 known common tern (Sterna hirundo) and Forster's tern (S. forsteri) colonies were located on marsh islands. All 23 great blue heron (Ardea herodias) colonies were located in forested areas usually along shorelines. The distance to and quantity of various man-made structures (e.g., buildings, roads, piers, agricultural...