Forest statistics for east Texas counties - 1986

Lang, Linda L.; Bertelson, Daniel F.

doi:10.2737/so-rb-118

Cited by 2 publications

(3 citation statements)

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“…The first was simply the number of spots detected (e.g., Billings & Pase 1979). This was used for the 30-yr record of spots in southeastern Texas (Region 1 of the Forest Survey of East Texas, Lang & Bertelson 1986). For the period 1973-1987, and for the whole of east Texas, we have also estimated the number of beetle-infested trees in each county in each year by multiplying the number of spot infestations in each size category by the median number of trees in the category and summing the products.…”

Section: Methodsmentioning

confidence: 99%

“…this method produces more accurate estimates than the first one, because the average size of spots may fluctuate as beetle populations increase and decline. The number of infested trees was then divided by the area (in acres) occupied by pine and mixed pine-hardwood forest in each county (Earles 1976, Lang & Bertelson 1986 to obtain a relative estimate of D. frontalis population density.…”

Section: Methodsmentioning

confidence: 99%

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Why Do Populations of Southern Pine Beetles (Coleoptera: Scolytidae) Fluctuate?

Turchin

Lorio

Taylor

et al. 1991

Environmental Entomology

128

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It is widely believed that population outbreaks of the southern pine beetle (Dendroctonus frontalts Zimm.) are caused by vagaries of climate, such as periods of severe drought. According to this view, D. frontalts population dynamics are dominated by densityindependent processes. We have statistically analyzed a So-yr record of D. frontalts activity in east Texas and have assessed the relative roles of density-independent and density-dependent factors in beetle population fluctuations. Regressionsof the rate of population change on three climatic variables were not significant. By contrast, both time-series and regression analyses provided strong and consistent evidence for delayed density regulation of D. frontalts populations. Thus, in contrast to previous analyses, we conclude that D. frontalts outbreaks are driven not by stochastic fluctuations of weather, but by some unknown population process acting in a delayed density-dependent manner. This result provides a starting point for a current study that will experimentally test various hypotheses concerning the role of natural enemies in D. frontalts cycles.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Why Do Populations of Southern Pine Beetles (Coleoptera: Scolytidae) Fluctuate?

Turchin

Lorio

Taylor

et al. 1991

Environmental Entomology

128

View full text Add to dashboard Cite

show abstract

“…A companion report, Resource Bulletin , discusses the forest resource in terms of timber values. Data summaries by county are provided in Resource Bulletin SO-i18 (Lang and Bertelson 1987). Earlier surveys were conducted in 1935, 1935-55, 1965, and 1975(see McWilliams and Lord 1988.…”

Section: Introductionmentioning

confidence: 99%

Nontimber values of East Texas timberland

Rudis¹

1988

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East Texas timberland is described in terms of (A) water and soils, (B) range or livestock use, (C) wildlife habitat, and (D) recreation.. The results presented in this report provide information about East Texas' forest resource in terms of nontimber values. Data were gathered while surveying timberland for regional forest management and planning. Further evaluation and critical assessment at appropriate levels of aggregation is encouraged. More detailed information is available at cost and through cooperative agreements with research institutions. Address inquiries to: Project Leader,

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Forest statistics for east Texas counties - 1986

Cited by 2 publications

References 0 publications

Why Do Populations of Southern Pine Beetles (Coleoptera: Scolytidae) Fluctuate?

Why Do Populations of Southern Pine Beetles (Coleoptera: Scolytidae) Fluctuate?

Nontimber values of East Texas timberland

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