Individual study: Effects of artificial manipulation of nesting substrate on nest-site selection and breeding success of common terns Sterna hirundo nesting on a concrete breakwater near Port Colborne, Lake Erie, Ontario, Canada
Richards M.H. & Morris R.D. (1984) An experimental study of nest site selection in common terns. Journal of Field Ornithology, 55, 457-466
This study is summarised as evidence for the intervention(s) shown on the right. The icon shows which synopsis it is relevant to.
Provide artificial nesting sites for ground and tree-nesting seabirds
A small replicated, controlled study from May-August in 1982 on a concrete breakwater in Port Colborne, Canada (Richards & Morris 1984), found that common terns Sterna hirundo nested at higher densities on two plots enhanced with clumps of mossy stonecrop and driftwood added (62% of 166 clutches in these plots), compared to plots layered with gravel (29% of clutches) or control plots of bare concrete (9% of clutches). Enhanced plots were also colonised earlier. Average clutch size and hatching rates were similar between plots (2.4-2.5 eggs/clutch and 76-86% hatching success), but the average number of chicks fledged per pair was significantly higher in enhanced (1.6) and control (1.3) plots than in gravel-layered plots (0.6). The breakwater was divided into six 5 ? 7 m plots, with two plots for each treatment.