Learn more. DOI: Monic Thibault. The commercial thinning of forests creates a dead wood resource pulse in the form of tree tops, branches, and stumps that are used by many organisms as a substrate but are also increasingly coveted as a source of bioenergy. To evaluate the effects Wind Pulse - RRR - Dead Wood (File) commercial thinning, as well as those of woody debris WD harvest, retention or supplementation on communities of cerambycids Coleoptera: CerambycidaeWind Pulse - RRR - Dead Wood (File) family of saprophagous wood-boring beetles, a 3-yr study was carried out in white spruce plantations subjected to three contrasting thinning regimes.
The regimes included a standard commercial thinning, a thinning with biomass removal, and a thinning with added standing dead wood. Beetles were captured starting the first summer following treatment using flight intercept traps, and the Milk Bag - HeavyLarry* - Flop (File, Album) of standing and downed WD was estimated using quadrats.
The results indicated that the complex of 25 cerambycid species was influenced by commercial thinning, by the time elapsed since thinning treatments were carried out, and by the abundance of fresh WD. This suggests that dead wood resource pulses caused by plantation thinning have a strong, beneficial effect on cerambycid communities that wanes as the amount of harvesting debris remaining on site decreases.
Figures - available via license: CC BY 3. Content may be subject to copyright. Conceptual relationship between stand age and fresh woody debris following a clearcut in a naturally regenerated la Viruta - Donato Racciatti - de Racciatti A Darienzo aan unthinned plantation band a plantation that was commercially thinned once Big Fat Mama - Status Quo - Piledriver. Fresh woody debris decay class I—II aold woody debris decay class III—V band snag c volumes measured in the different experimental treatments and secondary forests.
Secondary forests, although not included in the analysis because they are not part of the Wind Pulse - RRR - Dead Wood (File) design, are presented as a reference for the amount of dead wood found in old forests.
Citations 7. References Acanthocinus pusillus was found most often in andand in both disturbed treatments compared to controls, while R. Both of these species have been previously associated with disturbed habitats Dodds, ; Thibault and Moreau, Xylotrechus colonus and X. Response of bark beetles and woodborers to tornado damage and subsequent salvage logging in northern coniferous forests of Maine, USA.
Full-text available. Subsequent salvage operations removed damaged trees from some areas, while leaving blowdown in other areas. Bark beetles Coleoptera: Curculionidae: Scolytinae and woodborers Coleoptera: Buprestidae, Cerambycidae; Hymenoptera: Siricidae were trapped using semiochemical-baited traps from within each of these areas over a three-year period — Disturbance-initiated outbreaks of Dendroctonus rufipennis were a major concern after the windstorm.
However, D. Overall, bark beetles and woodborers were captured at higher numbers in the two disturbed treatments, relative to controls. Individual species responses varied, with many species found more often in one of the disturbed treatments compared to controls. Species richness and abundance were generally higher in disturbed treatments than in controls.
Blowdown and salvage treatments were also more similar to one another than to controls. Large amounts of dead wood provided easily exploitable habitat for wood-inhabiting insects in treatments; however, no evidence of alarming population increases of primary bark beetles were observed, suggesting that salvage operations are not always necessary to protect residual trees from attack by damaging bark beetles.
Indirect effects of an ecosystem engineer: how the Canadian beaver can drive the reproduction of saproxylic beetles. Sep J Zool. However, the paucity of empirical studies on this indirect interaction has hindered the integration of ecosystem engineering and food-web theory. Here, we investigated the effect of the Canadian beaver Castor canadensis on the activity, realized fecundity and ecosystem functions provided by saproxylic beetles by quantifying beetle emergence holes on woody debris within the Kouchibouguac National Park, New Brunswick, Canada.
We tested the hypothesis that perturbation induced by beaver activity enhances the activity and realized fecundity of saproxylic beetles by modifying their habitat and resource accessibility. At each site, we quantified insect emergence holes on snags at increasing distances from the watercourse. Our results suggest that engineered habitat patches enhance the activity and reproduction of saproxylic beetle species, small emergence holes from Scolytinae being only observed in abundance on small trees located close to the watercourse and large emergence holes from Cerambycidae being one third more abundant throughout beaver-modified sites.
The complementary relationship between the Canadian beaver and saproxylic beetles demonstrates the potential for conservation measures encapsulating all Wind Pulse - RRR - Dead Wood (File) these organisms. How long are thinning-induced resource pulses maintained in plantation forests?
Despite the critical role of pulsed resources on the dynamics and conservation of several forest-dwelling species, the transition between the period when the effects Wind Pulse - RRR - Dead Wood (File) a thinning-induced resource pulse are maximal and the period when only residual effects remain has yet to be documented in forest habitats.
In this study, we investigated the occurrence of a transition period after a woody necromass resource pulse produced by commercial thinning operations on flying coleopterans. In a large-scale manipulative study, spruce plantations were subjected to commercial thinning treatments and beetles collected using flight intercept traps during the four years that followed thinning operations.
For two years after thinning treatments, beetle communities differed in composition between thinned and unthinned plantations, species richness and abundance being higher in thinned areas. By the third and fourth year after thinning treatments, these differences started to fade, indicating that the transition period was occurring. This was associated with a decline in the quality of woody debris found Wind Pulse - RRR - Dead Wood (File) to or onto thinning trails.
These results support our hypothesis that fine woody debris, such as those produced by commercial thinning operations, are attractive to beetles for a short period because they rapidly decay and are rarely colonized by wood-boring species, inhibiting further colonization by Wind Pulse - RRR - Dead Wood (File) and mycophagous beetles. Yet, despite a decline in abundance and species richness in thinned areas during the last two years of the study, thinned plantations still harboured richer and more abundant beetle communities than unthinned plantations, suggesting that thinning trails continue to improve beetle dispersal as the woody necromass resource pulse weakens.
Settling in or passing through: Differentiating between wood-boring beetle visitation and colonization after a dead wood pulse.
To determine the effect of resource pulses on animal communities, it is important to differentiate the species colonizing the resource substrate from the ones simply moving through the system. Results demonstrated that the small horizontal debris generated by commercial thinning were used by saproxylic beetles but were not a preferred resource for colonization, by contrast with vertical dead wood.
Vertical dead wood, even if present in relatively Blue Moon - Elvis Presley - The Best Of Elvis Presley quantity when compared to horizontal dead wood, was a major determinant of beetle colonization and community composition.
Biomass removal was shown to have a strong detrimental impact on beetle colonization rates. Based on these results, we suggest that most of the saproxylic species trapped after commercial thinning operations were attracted in response to the initial pulse of resource but did not actually colonize the debris from thinning. Thus, we stress the Its A Small World - World Symphony Orchestra, Arthur Fiedler - World Symphony Orchestra of distinguishing between species visitation and colonization following a resource pulse when sampling relies on indirect trapping methods.
Jul Functional diversity response to hardwood forest management varies across taxa and spatial scales. Bryan D. Contemporary forest management offers a trade-off between the potential positive effects of habitat heterogeneity on biodiversity, and the potential harm to mature-forest communities caused by habitat loss and perforation of the forest canopy. While the response of taxonomic diversity to forest management has received a great deal of scrutiny, the response of functional diversity is largely unexplored.
However, functional diversity may represent a more direct link between biodiversity and ecosystem function. To examine how forest management affects diversity at multiple spatial scales, we analyzed a long-term dataset that captured changes in taxonomic and functional diversity of moths Lepidopteralonghorned beetles Coleoptera: Cerambycidaeand breeding birds in response to contemporary silvicultural systems in oak-hickory hardwood forests.
We used these datasets to address the following questions: how do even- and uneven-aged silvicultural systems affect taxonomic and functional diversity at the scale of managed landscapes compared to the individual harvested and unharvested forest patches that comprise the landscapes, and how do these silvicultural systems affect the functional similarity of assemblages at the scale of managed landscapes and patches?
Due to increased heterogeneity within landscapes, we expected even-aged silviculture to increase and uneven-aged silviculture to decrease functional diversity at the landscape level regardless of impacts at the patch level. Functional diversity responses were taxon-specific with respect to the direction of change and time since harvest.
Responses were also consistent across patch and landscape levels within each taxon. Moth assemblage species richness, functional richness, and functional divergence were negatively affected by harvesting, with stronger effects resulting from uneven-aged than even-aged management. Longhorned beetle assemblages exhibited a peak in species richness two years after harvesting, while functional diversity metrics did not differ between harvested and unharvested patches and managed landscapes.
The species and functional richness of breeding bird assemblages increased in response to harvesting You Are Not All Boring - The Landing EP more persistent effects in uneven- than in even-aged managed landscapes.
For moth and bird assemblages, species turnover was driven by species with more extreme trait combinations. Our study highlights the variability of multi-taxon functional diversity in response to forest management across multiple spatial scales. This article is protected by copyright. All rights reserved. Enhancing bark- and wood-boring beetle colonization and survival in vertical deadwood during thinning entries. Snags are used as habitat by several organisms, including bark- and wood-boring beetles, which contribute to snag decomposition and facilitate subsequent snag colonization by other organisms.
However, snags seldom occur in young managed forests. This study examines how snag characteristics and spatial arrangement affect bark- and wood-boring Wind Pulse - RRR - Dead Wood (File) colonization and survival in spruce plantations subjected to commercial thinning, thinning with biomass removal and thinning with snag creation where a Wind Pulse - RRR - Dead Wood (File) clumps of trees were girdled.
To this end, we documented the volume of snags, their characteristics and the number of beetle emergence holes in their basal section. Snag diameter at breast height, snag species and thinning treatments influenced the number of emergence holes per snag. Positive spatial autocorrelation between the abundance of emergence holes per snag was detected but no other spatial effect was noticeable. This work suggests that vertical deadwood is a limiting factor for bark- and wood-boring beetle colonization within plantations and challenges current thinking Wind Pulse - RRR - Dead Wood (File) the effect of thinning on beetle communities that was developed from window trap studies.
These results underline the importance of large diameter snags for beetle conservation within managed forests and demonstrate that tree girdling during thinning entries is a viable method for creating snags to enhance beetle colonization and survival. Show more. Changes in landscape composition and stand structure from — on an industrial forest in New Brunswick, Canada. David A. Detailed — cruise data and maps were used to compare species composition, age-class distribution, and stand structure between andfor a ha industrial forest in New Brunswick, Canada.
Management,reduced balsam,fir to lower mortality associated with spruce budworm, Choristoneura fumiferana Clem. Management in- creased timber production while maintaining similar softwood species composition, but altered age structure and areas of mixedwood,and hardwood,forest types.
Dying and dead trees - a review of their importance for biodiversity. Jan Saproxylic Invertebrates and their Conservation.
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