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Catastrophic wildfire and number of populations as factors influencing risk of extinction for Gila trout (Onchorhnchus gilae)

Author(s): D. K. Brown, A. A. Echelle, D. L. Propst, J. E. Brooks, W. L. Fisher
Year Published: 2001
Description:

We used the computer program RAMAS to explore the sensitivity of an extinction-risk model for the Gila trout (Oncorhynchus gibe) to management of wildfires and number of populations of the species. The Gila trout is an endangered salmonid presently restricted to very few headwaters of the Gila and San Francisco river tributaries in southwestern New Mexico. Life history data for 10 extant populations were used to examine sensitivity of the species* viability to changes in a variety of factors including population size. fecundity, life stage structure, number of populations. severity and probability of forest fires, and a regulated fishery. The probability and severity of forest fires and number of populations had the greatest effect on viability. Results indicate that successful conservation of Gila trout requires establishment of additional populations and reduction of the severity of forest fires through a program incorporating more frequent, but less severe, fires.

Citation: Brown, D. K., A. A. Echelle, D. L. Propst, J. E. Brooks, and W. L. Fisher. 2001. Catastrophic wildfire and number of populations as factors influencing risk of extinction for Gila trout (Oncorhynchus gilae). Western North American Naturalist, v. 61, no. 2, p. 139-148.
Topic(s): Fire Effects, Ecological - Second Order, Wildlife, Fire & Fuels Modeling, Fire & Wildlife, Fish
Ecosystem(s): None
Document Type: Book or Chapter or Journal Article
NRFSN number: 18501
FRAMES RCS number: 38056
TTRS (Tall Timbers Research Station) Number: 12610
Record updated: Nov 20, 2018