Providing evidence to improve practice

Individual study: Black rat Rattus rattus eradication by trapping allows recovery of breeding roseate tern Sterna dougallii and common tern S.hirundo populations on Feno Islet, the Azores, Portugal

Published source details

Amaral J., Almeida S., Sequeira M. & Neves V. (2010) Black rat Rattus rattus eradication by trapping allows recovery of breeding roseate tern Sterna dougallii and common tern S.hirundo populations on Feno Islet, the Azores, Portugal. Conservation Evidence, 7, 16-20


This study is summarised as evidence for the intervention(s) shown on the right. The icon shows which synopsis it is relevant to.

Control mammalian predators on islands for seabirds Bird Conservation

A before-and-after study on Feno Islet (1.6 ha), Azores, Portugal between 1997 and 2009 (Amaral et al. 2010) found that both roseate tern Sterna dougallii and common tern S. hirundo populations returned to the islet following the eradication of black rats Rattus rattus in March-April 2007. Pre-rat populations of roseate and common terns were estimated at 340 and 280 pairs respectively, but none bred in 2005. Common terns returned in 2007 and increased to approximately 120 pairs by 2009. Few roseate terns returned in 2007-8, but 260 pairs bred in 2009. A total of nine rats were trapped on the island.