BC List Status:
Blue (Considered to be of Special Concern)
Coastal Tailed Frog share habitat preferences and some basic morphological traits with other frog species including Northern Red-legged Frog and Western Toad. Western Toad tadpoles, typically found in shallow wetlands or vernal pool habitats, have been known to occur in fast flowing systems where they could be confused with Tailed Frog tadpoles. Northern Red-legged Frog can be highly mobile in riparian areas where adult and juvenile Tailed Frog may also occur. The somewhat ‘pebbly’ skin of Tailed Frog could also cause it to be confused with juvenile Western Toad.
Habitat loss and alteration (large-scale or persistent channel disturbance) due to urbanisation. Distribution (i.e. Areas of the South Coast) coincides with areas undergoing rapid development.
Alteration of microclimate regimes in riparian and upland forest areas, increase of water temperatures and siltation rates in streams, and habitat fragmentation due to forestry and other resource extractive activities.
Changes in effect flow regimes as well as increase barriers to movement by adults and tadpoles dues to inadequately designed or perched stream crossings (e.g. culverts).
Alteration of flow regimes or channel structure and seasonal wetted areas due to hydroelectric projects.
Effects of climate change and natural events (e.g., mudslides/avalanches, storms, flooding) that increase siltation, water temperatures or levels.
Direct mortality or sub-lethal impacts throughout all life history phases from fertilizer and pesticide applications in urban and agricultural areas as well as for silviculture management.
Combined with a low dispersal rate, slow development, and low reproductive capacity, the species is highly vulnerable to local extirpation where its habitat is being encroached by human activities.
Please consult the “Accounts and Measures for Managing Identified Wildlife – Accounts V.2 Coastal Tailed Frog Ascaphus truei.”, and “EBM Working Group Focal Species Project”, Watershed-level Protection and Management Measures for the Maintenance of Ascaphus Truei Populations in the Skeena Region and other management resources identified at the end of this factsheet. Inventory and monitoring resources include standardized methods (Resource Information Standards Committee) # 39 “Inventory Methods for Tailed Frogs and Pacific Giant Salamanders (Version 2.0)2.” Other than areas supporting high density adult populations, typical visual encounter surveys (VES) for adults/sub-adults can produce inconclusive results. Larval surveys may provide greater certainty for inventory purposes. Other approaches to inventorying and monitoring such as those found in “Measuring and Monitoring Biological Diversity - Standard Methods for Amphibians” and “Suitability of Amphibians and Reptiles for Translocation” are recommended.