Forest-Dwelling Vertebrate Faunas and Natural Fire Regimes in British Columbia: Patterns and Implications for Conservation

Structure of native vertebrate faunas within 12 different forest types were related to features of the natural fire regime. Relations between faunal structure and fire regime followed patterns expected if faunas were adapted to fire regimes. Proportions of species breeding early in succession tended to increase with increasing fire size or burn rate (ha/year; p = 0.03); those breeding late in succession tended to decrease (p = 0.04). As fire size increased, proportions of species breeding in cavities decreased (p < 0.01). Proportions of species using downed wood to breed increased as the interval between fires increased and downed wood accumulated (p < 0.01). Forestry practices to maintain biodiversity should mimic natural disturbance patterns, which differ across forest types. Implications for management to maintain vertebrate diversity are summarized in terms of the silvicultural system employed, the size of patches logged, the rate of timber removal, and the appropriate degree of connectivity among unlogged patches. La estructura de la fauna de vertebrados nativos dentro de 12 tipos distintos de bosques, fue relacionada con caracteristicas del regimen de incendios naturales. Las relaciones entre la estructura de la fauna y el regimen de incendios siguieron los patrones esperados para faunas adaptadas al regimen de incendios. Las proporciones de las especies que se reproducen tempranamente en la sucesion, tendio a aumentar con el incremento en el tamano del incendio o tasa de area quemada (ha/ano; p = 0.03); aquellas que se reproducen tardiamente en la sucesion tendieron a decrecer (p = 0.04). A medida que el tamano del incendio aumento, las proporciones de especies que se crian en cavidades decrece (p < 0.01). Las proporciones de las especies que utilizan madera caida para reproducirse se incremento en la medida en que el intervalo entre los incendios aumento y la madera caida se acumulo (p < 0.01). Las practicas forestales llevadas a cabo para mantener la biodiversidad deberian imitar los patrones de las perturbaciones naturales, las cuales difieren segun los tipos de bosques. Las connotaciones para el manejo a efecto de mantener una diversidad de vertebrados se resumen en terminos del sistema de silvicultura empleado, el tamano de los parches talados, la tasa de remocion de madera y el grado apropiado de conectividad entre los parches no talados.

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