Treesearch

The following is a report on the status of Candidate Old-growth (hereafter identified as COG) on National Forest System administered lands in California in the past, a t present, and in the immediate fhture. These r e s u l t s are based on information that may be speculative and contain inconsistencies, and therefore must be treated with caution. COG on these lands has declined substantially since 1900 or about the time the National Forest System was established. Estimated declines are from about 4 million acres in 1900 t o about 2 million acres a t present--a decline of about 50 percent.

Synopsis - Examples from California are used to illustrate typical responses to erosion and debris flow disasters the United States. Political institutions leave virtually all responsibility for disaster prevention to the lowest levels of government or to individuals. Three circumstances in which disasters occur are discussed: urbanized debris cones, urbanized unstable landforms, and logging of unstable terrain. By far the greatest economic losses result from the urbanization of unstable landforms. These losses occur not because of a lack of appropriate mitigative technology, but as the...

Examples from California are used to illustrate typical responses to erosion and debris flow disasters in the United States. Political institutions leave virtually all responsibility for disaster prevention to the lowest levels of government or to individuals. Three circumstances in which disasters occur are discussed: urbanized debris cones, urbanized unstable landforms, and logging of unstable terrain. By far the greatest economic losses result from the urbanization of unstable landforms. These losses occur not because of a lack of appropriate mitigative technology, but as the result of...

Much of the work on life history evolution in plants has dealt with allocation of reproductive effort (Abrahamson 1975; Abrahamson and Gadgil 1973; Gaines et al. 1974; McNaughton 1975; Oka 1976; Stearns 1976, 1977, 1980; Newell and Tramer 1978; Primack 1979). The juvenile period, however, occupies a major and critical portion of the life cycle of many species. Allocation of growth among vegetative organs during the juvenile period may place constraints on later development. The work of Marks (1975) and others (Troughton 1960; Monk 1966; Harper 1977; Pitelka 1977; Abrahamson 1979) suggested...

Methods were devloped for rearing Glypta fumiferanae Viereck on a nondiapausing laboratory colony of the western spruce budworm, Choristoneura occidentalis Freeman. Both host and parasite are univoltine and undergo diapause in nature. In this study, the parasite's voltinism was synchronized with that of a nondiapausing host. G fumiferanae mated readily in the laboratory, and 5 consecutive generations were reared with an average generation time of less than 8 weeks-much less that the 23 weeks needed for 1 generation to develop in the field. Developmental times are reported, and some aspects...