Hard Releases of the Kihansi Spray Toad Back to the Kihansi Gorge
摘要
On 30 October 2012, 2000 Kihansi Spray Toads were reintroduced in a hard release to the Upper Spray Wetland. This reintroduction represented the culmination of 12 years of effort by multiple institutions and individuals to conserve the Kihansi Spray Toad in the wild. In early November 2012, 435 spray toads were also reintroduced to the Mhalala Spray Wetland. The abundance of the Kihansi Spray Toad in both spray wetlands declined rapidly over the first month followed by a slower decline over the following 2 to 3 months. A second hard release of 1500 animals was conducted in the Upper Spray Wetland in March 2013. Change over time in abundance of the Kihansi Spray Toad following the second release was highly similar to that observed during the first releases in the Upper and Mhalala Spray Wetlands—a rapid decline after the first month follower by a slower decline over the following 2 months. Nonetheless, an encouraging result emerged from the first two hard releases in the Upper Spray Wetland. A very small population survived up to 2 years in the Upper Spray Wetland following the first and second hard releases. The small surviving population contained gravid females and juveniles indicating post-release reproduction and survival of neonates. A third hard release was conducted in the Upper Spray Wetland in February 2015. Highly similar patterns were observed again in the change in abundance over time of the Kihansi Spray Toad with a very small reproducing population surviving up to 2 years in the Upper Spray Wetland following the third hard release.