Assessment of Potential Indicator Species for Monitoring ...

stocks. Tadpoles turn into tiny frogs in two to three months (Orchard pers.
comm.1992).
2d. Migration behaviour is well documented?
Not well documented.
2e. Information on historic abundance?
No.
3a. Can nests or animal be easily located?
Males have a loud mating call which can be heard for several kilometres. This
could help in locating breeding sites (Orchard pers. comm. 1994).
3b. Can samples be easily collected?
Finding clusters of eggs should be fairly easy. Each egg in the mass is usually
yellow on top and brown on the bottom (Orchard pers. comm. 1994).
4a. Captive rearing possible and well understood?
Yes (Johnson 1980 reviewed in Harfenist et al. 1989).
4b. Captive breeding possible and well understood?
Insufficient information.
5a. Is there historic information on contaminant burdens in the Fraser Basin?
No.
5b. Has this species been used in contaminant studies in other regions?
Yes (Johnson 1980 reviewed in Harfenist et al.1989).
5c. Have biological effects for this species been studied?
Yes (Johnson 1980 reviewed in Harfenist et al.1989).
RED-LEGGED FROG Rana aurora
1a. Present in the Fraser Basin year-round?
Yes.
1b. Broad distribution?
No, they occur in the coastal region of the Fraser Valley as far up as Chilliwack
(Orchard 1984).
1c. Common in Fraser Basin?
No.
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