The value of stormwater wetlands for supporting multiple life-history stages of the wood frog (Lithobates sylvaticus) in the City of Edmonton, Alberta, Canada

  • Author / Creator
    Scheffers, Brett
  • I reviewed 32 urban amphibian studies from North America and found most amphibians respond negatively to urbanization (69 negative responses, 6 positive and 35 no effect). Additionally, I conducted amphibian surveys (adult, egg, larvae, and metamorphs) at 75 wetlands located throughout the City of Edmonton, Alberta, Canada, with a focus on the wood frog (Lithobates sylvaticus). Wetlands consisted of natural river valley and upland sites, and constructed stormwater wetlands. Breeding male wood frogs occured at 50% of stormwater wetlands versus 93% of natural wetlands. The presence of breeding males was best predicted by the proportion of native vegetation within 100 m of a wetland. Wood frogs successfullly reproduced on stormwater wetlands but relative abundances of eggs, tadpoles and metamorphs were lower than at natural sites. However, stormwater metamorphs were significantly larger which may contribute to higher survivorship and subsequent reproductive success. Stormwater wetlands are required to control flooding and run-off, therefore, future amphibian conservation efforts should focus on preserving native terrestrial habitat surrounding urban wetlands.

  • Subjects / Keywords
  • Graduation date
    Fall 2010
  • Type of Item
  • Degree
    Master of Science
  • DOI
  • License
    This thesis is made available by the University of Alberta Libraries with permission of the copyright owner solely for non-commercial purposes. This thesis, or any portion thereof, may not otherwise be copied or reproduced without the written consent of the copyright owner, except to the extent permitted by Canadian copyright law.