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Ecological Applications, 15(6), 2005, pp. 21612170 2005 by the Ecological Society of America
 

Summary: 2161
Ecological Applications, 15(6), 2005, pp. 2161­2170
2005 by the Ecological Society of America
MATRIX MODEL INVESTIGATION OF INVASIVE SPECIES CONTROL:
BULLFROGS ON VANCOUVER ISLAND
PURNIMA GOVINDARAJULU,1
RES ALTWEGG,2
AND BRADLEY R. ANHOLT
Department of Biology, University of Victoria, Victoria, British Columbia V8W 3N5 Canada
Abstract. Invasive species control is now a conservation priority in many parts of the
world. Demographic modeling using population matrix models is a useful tool in the design
of these control efforts as it identifies the life stages with the strongest influence on pop-
ulation dynamics. As a case in point, American bullfrogs (Rana catesbeiana) have been
introduced around the world and have negative effects on native fauna. We studied de-
mography of four populations on southern Vancouver Island, Canada, using field obser-
vations and capture­mark­recapture methods to estimate survival, growth, and fecundity.
The life cycle of these introduced bullfrogs progressed in yearly increments through the
following stages: eggs/small tadpoles, first-year tadpoles, second-year tadpoles, meta-
morphs/juveniles, and adults. Some bullfrog tadpoles were able to skip the second-year
tadpole stage and metamorphosed one year after hatching. With tadpole survival estimates

  

Source: Altwegg, Res - Avian Demography Unit, Department of Statistical Sciences, University of Cape Town

 

Collections: Environmental Sciences and Ecology