Hydroperiod and metamorphosis in the small-mouthed salamander
Ambystoma texanum (Small-mouthed Salamander) breeds primarily in temporary wetlands, and while natural history studies have suggested a minimum larval period of about 2 mo, it is not clear how hydroperiod (the length of time that a temporary wetland holds water) infl uences populations. I conducted a mesocosm experiment to investigate the effects of hydroperiod on the completion of metamorphosis, as well as age and size at metamorphosis. I used hydroperiods of 50, 75, and 100 d, and a non-drying treatment as a control. Survival to the end of each hydroperiod was consistent among all groups, but no individuals completed metamorphosis in the 50-d treatment. The proportion of individuals completing metamorphosis increased with longer hydroperiods, as did the age at metamorphosis. The size at metamorphosis, however, was not affected by the length of the hydroperiod. My results show that a minimum hydroperiod of 2.5 mo is necessary for populations of Small-mouthed Salamander. Maintenance of natural hydroperiods in wetlands under the threat of development is a critical consideration for the long-term persistence of Small-mouthed Salamander populations.
Note: Link is to the article in a subscription database available to users affiliated with Butler University. Appropriate login information will be required for access. Users not affiliated with Butler University should contact their local librarian for assistance in locating a copy of this article.
Travis J. Ryan. "Hydroperiod and metamorphosis in the small-mouthed salamander" Northeastern Naturalist 14 (2007): 419-428.