The Experts below are selected from a list of 249 Experts worldwide ranked by ideXlab platform
John P. Hayes - One of the best experts on this subject based on the ideXlab platform.
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Short-Term Response of Dicamptodon tenebrosus Larvae to Timber Management in
2020Co-Authors: Niels Leuthold, Michael J. Adams, John P. HayesAbstract:In the Pacific Northwest, previous studies have found a negative effect of Timber Management on the abundance of stream amphibians, but results have been variable and region specific. These studies have generally used survey methods that did not account for differences in capture probability and focused on stands that were harvested under older Management practices. We examined the influences of contemporary forest practices on larval Dicamptodon tenebrosus as part of the Hinkle Creek paired watershed study. We used a mark-recapture analysis to estimate D. tenebrosus density at 100 1-m sites spread throughout the basin and used extended linear models that accounted for correlation resulting from the repeated surveys at sites across years. Density was associated with substrate, but we found no evidence of an effect of harvest. While holding other factors constant, the model-averaged estimates indicated; 1) each 10% increase in small cobble or larger substrate increased median density of D. tenebrosus 1.05 times, 2) each 100-ha increase in the upstream area drained decreased median density of D. tenebrosus 0.96 times, and 3) increasing the fish density in the 40 m around a site by 0.01 increased median salamander density 1.01 times. Although this study took place in a single basin, it suggests that Timber Management in similar third-order basins of the southwestern Oregon Cascade foothills is unlikely to have short-term effects of D. tenebrosus larvae. 2011 The Wildlife Society.
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short term response of dicamptodon tenebrosus larvae to Timber Management in southwestern oregon
Journal of Wildlife Management, 2012Co-Authors: Niels Leuthold, Michael J. Adams, John P. HayesAbstract:In the Pacific Northwest, previous studies have found a negative effect of Timber Management on the abundance of stream amphibians, but results have been variable and region specific. These studies have generally used survey methods that did not account for differences in capture probability and focused on stands that were harvested under older Management practices. We examined the influences of contemporary forest practices on larval Dicamptodon tenebrosus as part of the Hinkle Creek paired watershed study. We used a mark–recapture analysis to estimate D. tenebrosus density at 100 1-m sites spread throughout the basin and used extended linear models that accounted for correlation resulting from the repeated surveys at sites across years. Density was associated with substrate, but we found no evidence of an effect of harvest. While holding other factors constant, the model-averaged estimates indicated; 1) each 10% increase in small cobble or larger substrate increased median density of D. tenebrosus 1.05 times, 2) each 100-ha increase in the upstream area drained decreased median density of D. tenebrosus 0.96 times, and 3) increasing the fish density in the 40 m around a site by 0.01 increased median salamander density 1.01 times. Although this study took place in a single basin, it suggests that Timber Management in similar third-order basins of the southwestern Oregon Cascade foothills is unlikely to have short-term effects of D. tenebrosus larvae. © 2011 The Wildlife Society.
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Short‐term response of Dicamptodon tenebrosus larvae to Timber Management in southwestern Oregon
Journal of Wildlife Management, 2011Co-Authors: Niels Leuthold, Michael J. Adams, John P. HayesAbstract:In the Pacific Northwest, previous studies have found a negative effect of Timber Management on the abundance of stream amphibians, but results have been variable and region specific. These studies have generally used survey methods that did not account for differences in capture probability and focused on stands that were harvested under older Management practices. We examined the influences of contemporary forest practices on larval Dicamptodon tenebrosus as part of the Hinkle Creek paired watershed study. We used a mark–recapture analysis to estimate D. tenebrosus density at 100 1-m sites spread throughout the basin and used extended linear models that accounted for correlation resulting from the repeated surveys at sites across years. Density was associated with substrate, but we found no evidence of an effect of harvest. While holding other factors constant, the model-averaged estimates indicated; 1) each 10% increase in small cobble or larger substrate increased median density of D. tenebrosus 1.05 times, 2) each 100-ha increase in the upstream area drained decreased median density of D. tenebrosus 0.96 times, and 3) increasing the fish density in the 40 m around a site by 0.01 increased median salamander density 1.01 times. Although this study took place in a single basin, it suggests that Timber Management in similar third-order basins of the southwestern Oregon Cascade foothills is unlikely to have short-term effects of D. tenebrosus larvae. © 2011 The Wildlife Society.
Kimberly R Hall - One of the best experts on this subject based on the ideXlab platform.
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combined long term effects of variable tree regeneration and Timber Management on forest songbirds and Timber production
Forest Ecology and Management, 2011Co-Authors: James D A Millington, Michael B Walters, Megan S Matonis, Edward J Laurent, Kimberly R HallAbstract:The structure of forest stands is an important determinant of habitat use by songbirds, including species of conservation concern. In this paper, we investigate the combined long-term impacts of variable tree regeneration and Timber Management on stand structure, songbird occupancy probabilities, and Timber production in northern hardwood forests. We develop species-specific relationships between bird species occupancy and forest stand structure for canopy-dependent black-throated green warbler (Dendroica virens), eastern wood-pewee (Contopus virens), least flycatcher (Empidonax minimus) and rose-breasted grosbeak (Pheucticus ludovicianus) from field data collected in northern hardwood forests of Michigan’s Upper Peninsula. We integrate these bird-forest structure relationships with a forest simulation model that couples a forest-gap tree regeneration submodel developed from our field data with the US Forest Service Forest Vegetation Simulator (Ontario variant). Our bird occupancy models are better than null models for all species, and indicate species-specific responses to Management-related forest structure variables. When simulated over a century, higher overall tree regeneration densities and greater proportions of commercially high value, deer browse-preferred, canopy tree Acer saccharum (sugar maple) than low-value, browse-avoided subcanopy tree Ostrya virginiana (ironwood) ensure conditions allowing larger harvests of merchantable Timber and had greater impacts on bird occupancy probability change. Compared to full regeneration, no regeneration over 100 years reduces merchantable Timber volumes by up to 25% and drives differences in bird occupancy probability change of up to 30%. We also find that harvest prescriptions can be tailored to affect both Timber removal volumes and bird occupancy probability simultaneously, but only when regeneration is adequate. When regeneration is poor (e.g., 25% or less of trees succeed in regenerating), Timber harvest prescriptions have a greater relative influence on bird species occupancy probabilities than on the volume of merchantable Timber harvested. However, regeneration density and composition, particularly the density of Acer saccharum regenerating, have the greatest long-term effects on canopy bird occupancy probability. Our results imply that forest and wildlife managers need to work together to ensure tree regeneration density and composition are adequate for both Timber production and the maintenance of habitat for avian species over the long-term. Where tree regeneration is currently poor (e.g., due to deer herbivory), forest and wildlife managers should pay particularly close attention to the long-term impacts of Timber harvest prescriptions on bird species.
Raymond M Sheffield - One of the best experts on this subject based on the ideXlab platform.
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the effects of population growth on Timber Management and inventories in virginia
Forest Ecology and Management, 1999Co-Authors: David N Wear, Michael J Foreman, Raymond M SheffieldAbstract:Expanding human populations may have important effects on the availability of Timber from private lands in the South. To examine the effects of development on Timber supply, we compared the density of populations and various site variables with expert opinions on the future location of commercial Timberland for a study site in Virginia. Population density is a significant predictor of commercial Timberland and resulting probability equations provide a method for adjusting Timber inventories. Findings indicate that the transition between rural and urban land use occurs where population density is between 20 and 70 people per square mile. Population effects reduce commercial inventories between 30 and 49% in the study area.
Helen C. Smith - One of the best experts on this subject based on the ideXlab platform.
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Combining carbon sequestration objectives with Timber Management planning
Mitigation and Adaptation Strategies for Global Change, 2003Co-Authors: Fan-rui Meng, Charles P.-a. Bourque, Steven P. Oldford, D. Edwin Swift, Helen C. SmithAbstract:This paper presents a new approachto assessing carbon (C) sequestration incommercial forests at spatial scalesrelevant to forest managers. The approachcombines C-sequestration objectives withTimber and non-Timber (i.e., wildlifehabitat) Management objectives. As ademonstration, the approach is applied to a105,000 ha special Management area innorthern New Brunswick, Canada over asimulated time horizon of 80 years. Carbonstock calculations are carried out bymultiplying a series of simple woodvolume-to-C conversion factors to woodsupply projections generated with theWoodstock™ wood supply (RemSoft Inc.) andCWIZ™ linear programming software. Basicinput requirements to the wood supply modelinclude (i) current forest stand inventoryand forest age structure, (ii) growth andyield curves for naturally developingstands, (iii) modified growth and yieldcurves to describe post-treatment standresponse, (iv) non-Timber objectives, and(v) specific harvesting prescriptions,including extent of application area andintensity. Spatial blocking of stands iscarried out by importing the treatmentschedule from the 80-year plan and byproviding spatial constraints such asgreen-up delays and adjacency rules over a25-year planning horizon. Model projectionindicates that C stock in the forestof the special Management area willincrease in the next 40 years under theproposed harvesting plan and start todecrease thereafter. Under theno-disturbance scenario (both natural andman-made), the carbon stock in the forestwill increase for the next 60 years andstart to decline thereafter. For the wholeplanning period, carbon stock in the forestfollowing current industrial practices willbe less than naturally growing forestwithout any form of disturbance.Although model calculations are notexact, combining C objectives with TimberManagement objectives provides a goodframework for assessing C sequestration incommercial forests, given the excellentquality of the forest input data regardingabove ground biomass. Improvements tomodelled C-sequestration projections maytake place as scientific information aboutthe details of the C cycle in managedforests becomes available.
Niels Leuthold - One of the best experts on this subject based on the ideXlab platform.
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Short-Term Response of Dicamptodon tenebrosus Larvae to Timber Management in
2020Co-Authors: Niels Leuthold, Michael J. Adams, John P. HayesAbstract:In the Pacific Northwest, previous studies have found a negative effect of Timber Management on the abundance of stream amphibians, but results have been variable and region specific. These studies have generally used survey methods that did not account for differences in capture probability and focused on stands that were harvested under older Management practices. We examined the influences of contemporary forest practices on larval Dicamptodon tenebrosus as part of the Hinkle Creek paired watershed study. We used a mark-recapture analysis to estimate D. tenebrosus density at 100 1-m sites spread throughout the basin and used extended linear models that accounted for correlation resulting from the repeated surveys at sites across years. Density was associated with substrate, but we found no evidence of an effect of harvest. While holding other factors constant, the model-averaged estimates indicated; 1) each 10% increase in small cobble or larger substrate increased median density of D. tenebrosus 1.05 times, 2) each 100-ha increase in the upstream area drained decreased median density of D. tenebrosus 0.96 times, and 3) increasing the fish density in the 40 m around a site by 0.01 increased median salamander density 1.01 times. Although this study took place in a single basin, it suggests that Timber Management in similar third-order basins of the southwestern Oregon Cascade foothills is unlikely to have short-term effects of D. tenebrosus larvae. 2011 The Wildlife Society.
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short term response of dicamptodon tenebrosus larvae to Timber Management in southwestern oregon
Journal of Wildlife Management, 2012Co-Authors: Niels Leuthold, Michael J. Adams, John P. HayesAbstract:In the Pacific Northwest, previous studies have found a negative effect of Timber Management on the abundance of stream amphibians, but results have been variable and region specific. These studies have generally used survey methods that did not account for differences in capture probability and focused on stands that were harvested under older Management practices. We examined the influences of contemporary forest practices on larval Dicamptodon tenebrosus as part of the Hinkle Creek paired watershed study. We used a mark–recapture analysis to estimate D. tenebrosus density at 100 1-m sites spread throughout the basin and used extended linear models that accounted for correlation resulting from the repeated surveys at sites across years. Density was associated with substrate, but we found no evidence of an effect of harvest. While holding other factors constant, the model-averaged estimates indicated; 1) each 10% increase in small cobble or larger substrate increased median density of D. tenebrosus 1.05 times, 2) each 100-ha increase in the upstream area drained decreased median density of D. tenebrosus 0.96 times, and 3) increasing the fish density in the 40 m around a site by 0.01 increased median salamander density 1.01 times. Although this study took place in a single basin, it suggests that Timber Management in similar third-order basins of the southwestern Oregon Cascade foothills is unlikely to have short-term effects of D. tenebrosus larvae. © 2011 The Wildlife Society.
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Short‐term response of Dicamptodon tenebrosus larvae to Timber Management in southwestern Oregon
Journal of Wildlife Management, 2011Co-Authors: Niels Leuthold, Michael J. Adams, John P. HayesAbstract:In the Pacific Northwest, previous studies have found a negative effect of Timber Management on the abundance of stream amphibians, but results have been variable and region specific. These studies have generally used survey methods that did not account for differences in capture probability and focused on stands that were harvested under older Management practices. We examined the influences of contemporary forest practices on larval Dicamptodon tenebrosus as part of the Hinkle Creek paired watershed study. We used a mark–recapture analysis to estimate D. tenebrosus density at 100 1-m sites spread throughout the basin and used extended linear models that accounted for correlation resulting from the repeated surveys at sites across years. Density was associated with substrate, but we found no evidence of an effect of harvest. While holding other factors constant, the model-averaged estimates indicated; 1) each 10% increase in small cobble or larger substrate increased median density of D. tenebrosus 1.05 times, 2) each 100-ha increase in the upstream area drained decreased median density of D. tenebrosus 0.96 times, and 3) increasing the fish density in the 40 m around a site by 0.01 increased median salamander density 1.01 times. Although this study took place in a single basin, it suggests that Timber Management in similar third-order basins of the southwestern Oregon Cascade foothills is unlikely to have short-term effects of D. tenebrosus larvae. © 2011 The Wildlife Society.
