Natural variability of specific forest insect populations and their associated effects in Colorado /

Schmid, J. M.; Mata, S. A.; Forest, Rocky Mountain; Station, Range Experiment

doi:10.5962/bhl.title.99671

Cited by 31 publications

(65 citation statements)

References 19 publications

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“…Windthrow events that occur in susceptible stands may result in outbreak populations of this insect. Scattered windthrow in late winter or spring is most conducive to population increases [58,151]. Windthrown trees should be sampled in late July-August following adult flight to determine attack densities in the downed material using a sampling scheme developed by Schmid [59].…”

Section: Detection and Evaluationmentioning

confidence: 99%

Spruce Beetle Biology, Ecology and Management in the Rocky Mountains: An Addendum to Spruce Beetle in the Rockies

Jenkins

Hebertson

Munson

2014

Forests

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Spruce beetle outbreaks have been reported in the Rocky Mountains of western North America since the late 1800s. In their classic paper, Spruce Beetle in the Rockies, Schmid and Frye reviewed the literature that emerged from the extensive outbreaks in Colorado in the 1940s. A new wave of outbreaks has affected Rocky Mountain subalpine spruce-fir forests beginning in the mid-1980s and continuing to the present. These outbreaks have spurred another surge of basic and applied research in the biology, ecology and management of spruce and spruce beetle populations. This paper is a review of literature on spruce beetle focusing on work published since the late 1970s and is intended as an addendum to Spruce Beetle in the Rockies.

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Section: Detection and Evaluationmentioning

confidence: 99%

Spruce Beetle Biology, Ecology and Management in the Rocky Mountains: An Addendum to Spruce Beetle in the Rockies

Jenkins

Hebertson

Munson

2014

Forests

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“…Most outbreaks occur in stands that are at least 80 years old, with trees at least 8 inches (20 cm) dbh (Koch 1996;Schmid and Mata 1996). Typically, the larger trees are killed in groups of up to 100 (Schmid and Mata 1996).…”

Section: Insectsmentioning

confidence: 99%

Historic range of variability for upland vegetation in the Medicine Bow National Forest, Wyoming

Dillon¹,

Knight²,

Meyer³

2005

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An approach for synthesizing the results of ecological research pertinent to land management is the analysis of the historic range of variability (HRV) for key ecosystem variables that are affected by management activities. This report provides an HRV analysis for the upland vegetation of the Medicine Bow National Forest in southeastern Wyoming. The variables include live tree density, dead tree (snag) density, canopy cover, abundance of coarse woody debris, species diversity, fire return intervals, the abundance of various diseases, the proportion of the landscape in different land cover types, and the degree of patchiness in the landscape. The variables were examined at the stand and landscape scales, using information available in the literature and USFS databases. High-elevation landscapes were considered separately from low-elevation landscapes. Much of the report pertains to forests dominated by lodgepole pine, subalpine fir, and Engelmann spruce at high elevations, and by ponderosa pine and aspen at lower elevations. We defined the HRV reference period for the MBNF as approximately 1600 to 1860.Keywords: aspen, bark beetles, canopy gaps, coarse woody debris, comandra blister rust, dwarf mistletoe, Engelmann spruce, fire effects, disease in Rocky Mountain forests, forest fragmentation, insects in forests, interior forest, landscape ecology, lodgepole pine, mistletoe, mountain pine beetle, ponderosa pine, roads, Rocky Mountain forests, snags, spruce beetle, subalpine fir, subalpine forests, timber harvesting effects, white pine blister rust, wind in forests Executive SummaryThe challenges of sustainable land management have led to an increased emphasis on incorporating the results of science in the decision making process. One approach for accomplishing this objective is through the analysis of the historic range of variability (HRV) for key ecosystem variables that are affected by management activities. The rationale for HRV analyses is that the chances of sustainable forest management are greater if the variation in managed ecosystems includes the range of conditions that are expected at various scales in ecosystems relatively uninfluenced by humans. This report provides an HRV analysis for the upland vegetation of the Medicine Bow National Forest (MBNF).By definition, HRV analyses require the identification of specific variables and an estimation of how those variables fluctuated, at more than one scale, prior to the advent of resource extraction and management by EuropeanAmericans. A complete list of the variables that we examined is found in table 7. Examples include live tree density, dead tree (snag) density, canopy cover, abundance of coarse woody debris, species diversity, fire return intervals, the abundance of various diseases, the proportion of the landscape in different land cover types, and the degree of patchiness in the landscape. We examined variables at two scales-the stand and the landscape-and we separated high-elevation landscapes from low-elevation landscapes. Much of the repo...

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“…there is much evidence for historical MPB epidemics, in the obvious absence of human interference, whose scale is unknown relative to current epidemics (Schmid and Mata, 1996;Alfaro et al, 2004). My study, by identifying MPB .. dispersal highways," may facilitate better management of MPB epidemics; however, it is likely that MPB outbreaks will occur for the foreseeable future.…”

Section: Managem Ent Recommendationsmentioning

confidence: 99%

“…consequences of outbreaks, as well as the conditions during outbreaks, are beneficial for many species ranging from understory vegetation to large mammals (Schmid and Mata, 1996;Martin eta/., 2006).…”

Section: Introductionmentioning

confidence: 99%

A microsatellite analysis of the western Canadian mountain pine beetle (Dendroctonus ponderosae) epidemic: phylogeography and long distance dispersal patterns

Bartell¹

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The mountain pine beetle (MPB) is an eruptive insect that is currently causing an outbreak of record size in Western Canada. A lack of long distance MPB dispersal data has limited our understanding of and ability to manage MPB epidemics. My goal was to determine the MPBs Western Canadmn population structure. upon wh1ch d1spersal patterns may be supenmposed. I analyzed MPBs from 35 mfested lodgepole pine stands at six microsatellite loc1. The MPB exh1bited strong and s1gmticant Western Canadian population structure. Th1~ population ~tructure wa~ mcongruent w1th the structure of its primary symbiont. 0. £ hn igerwn. but congruent \\1 ith the structure of 1ts primary host, P.contorta. Novel fungal selection pres~ure~ ha"Ve probably caused the discrepancy in beetle/fungus phylogeography. A result of Western Canadmn MPB population structure alternately contrasts and supports population structure~ previou~ly reported for Scolytids, including MPBs. The partitioning of MPB populatiOn structure into a Northern and Southern group is most likely the result of postglacial recolonization and differences in MPB population dynamics. Primarily using my genetic data, I inferred the historical movement patterns of the MPB in Western Canada. I found no evidence that the epidemic spread from an epicenter in Tweedsmuir Provincial Park. My data support multiple sources for the current epidemic; I suggest that regional population expansions have caused the rapid escalation in the severity of the current epidemic. MPB movement patterns and atmospheric wind data were concordant; winds in Western Canada are predominantly westerly or southwesterly. which was the predominant direction of inferred movements amo ng MPB populations. In contrast, current MPB population structure best fits a 30-year climatic suitabi lity distribution for a historical as II opposed to the most current ( 1971 -2000) period. The population genetics of long distance MPB dispersal. an evolutionary theory for MPB population dynamics. and MPB "range expansion" are extensively d1scussed. Potential biases and research limitations are noted. Based on my results and inferences. future areas of investigation are noted.An executive summary. with management recommendations. is prov1ded as a conclusion.

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Natural variability of specific forest insect populations and their associated effects in Colorado /

Abstract: Schmid, J.M; Mata, S. A. 1996. Natural variability of specific forest insect populations and their associated effects in Colorado.

Cited by 31 publications

References 19 publications

Spruce Beetle Biology, Ecology and Management in the Rocky Mountains: An Addendum to Spruce Beetle in the Rockies

Spruce Beetle Biology, Ecology and Management in the Rocky Mountains: An Addendum to Spruce Beetle in the Rockies

Historic range of variability for upland vegetation in the Medicine Bow National Forest, Wyoming

A microsatellite analysis of the western Canadian mountain pine beetle (Dendroctonus ponderosae) epidemic: phylogeography and long distance dispersal patterns

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