BioOne.org will be down briefly for maintenance on 17 December 2024 between 18:00-22:00 Pacific Time US. We apologize for any inconvenience.
How to translate text using browser tools
18 December 2008 Demography and Movement in a Relocated Population of Oregon Spotted Frogs (Rana pretiosa): Influence of Season and Gender
Nathan D. Chelgren, Christopher A. Pearl, Michael J. Adams, Jay Bowerman
Author Affiliations +
Abstract

We used five years of recapture data and Bayesian estimation to assess seasonal survival, movement, and growth of Oregon Spotted Frogs (Rana pretiosa) relocated into created ponds at Dilman Meadow in Oregon, USA. We evaluate hypotheses specific to the relocation and elucidate aspects of R. pretiosa life history that are poorly known. The odds of survival of relocated individuals during the first year following relocation were 0.36 times the survival odds of relocated and non-relocated frogs after one year since the relocation. Survival rate was higher for large frogs. After accounting for frog size, we found little variation in survival between ponds at Dilman Meadow. Survival was lowest for males during the breeding/post-breeding redistribution period, suggesting a high cost of breeding for males. The highest survival rates occurred during winter for both genders, and one small spring was used heavily during winter but was used rarely during the rest of the year. Individual growth was higher in ponds that were not used for breeding, and increased with increasing pond age. Our study supports other evidence that R. pretiosa use different habitats seasonally and are specific in their overwintering habitat requirements. Because frogs were concentrated during winter, predator-free overwintering springs are likely to be of particular value for R. pretiosa populations.

2008 by the American Society of Ichthyologists and Herpetologists
Nathan D. Chelgren, Christopher A. Pearl, Michael J. Adams, and Jay Bowerman "Demography and Movement in a Relocated Population of Oregon Spotted Frogs (Rana pretiosa): Influence of Season and Gender," Copeia 2008(4), 742-751, (18 December 2008). https://doi.org/10.1643/CH-07-142
Received: 28 June 2007; Accepted: 1 February 2008; Published: 18 December 2008
RIGHTS & PERMISSIONS
Get copyright permission
Back to Top