Thinning of mature lodgepole pine stands increases scolytid bark beetle abundance and diversity

Hindmarch, Trevor D.; Reid, Mary L.

doi:10.1139/x01-083

Cited by 33 publications

(15 citation statements)

References 29 publications

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“…Most previous research on scolytids has been conducted at the smaller patch or stand scale, with no consideration of the landscape context of the patch. For example, the abundance of scolytids and their associated predators has been shown to be influenced by stand‐level variables such as thinning (Schroeder 1999, Hindmarch and Reid 2001) and stand condition (Erbilgin and Raffa 2002, Erbilgin et al 2002). Decreases in predator to prey ratios in isolated stands in our study are likely not due to such factors because stand conditions (size, age, tree density, tree species, number of recently dead or dying trees) were similar for the two landscape types.…”

Section: Discussionmentioning

confidence: 99%

Habitat loss decreases predator–prey ratios in a pine‐bark beetle system

Ryall¹,

Fahrig²

2005

Oikos

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L. 2005. Habitat loss decreases predator Á/prey ratios in a pinebark beetle system. Á/ Oikos 110: 265 Á/270.Increasing intensity of land use by humans has led to loss of natural habitats, resulting in isolation of remaining habitat fragments. Using a pine-bark beetle ecosystem as a model, we tested the hypothesis that the ratio of abundance of predators to prey should decrease with increasing habitat loss at the landscape scale. We selected ten red pine (Pinus resinosa ) sites, representing extremes of available habitat within a 2 km radius surrounding each stand. The bark beetle, Ips pini , and its coleopteran predators were sampled using baited multiple funnel traps. Effects of stand isolation were considerable; ratios of predators to prey (mean number of predators/number of prey9/SE) were significantly reduced in isolated stands (0.389/0.09) as compared to those with large amounts of surrounding conifer habitat (1.639/0.41). The decline in ratio occurred both because there was: a) a lower abundance of predators (ca 0.5 Á/0.8 )/) captured in isolated stands; and b) a significantly higher number of prey (ca 2.2 )/) captured in isolated stands. Isolation or loss of habitat, therefore, differentially affected the two trophic levels, supporting theoretical predictions. Reductions in predator abundance and, presumably, enemy-caused mortality may lead to changes in the population dynamics of their prey species, possibly leading to increased outbreaks as habitat becomes increasingly isolated.

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Section: Discussionmentioning

confidence: 99%

Habitat loss decreases predator–prey ratios in a pine‐bark beetle system

Ryall¹,

Fahrig²

2005

Oikos

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“…Previous studies have used larval galleries or emergence holes as a by‐product of larval sampling (Saint‐Germain et al., ; Webb et al., ) or as proof of beetle presence in coarse woody debris (Lindelo et al., ; Hindmarch & Reid, ; Hayes et al., ), but few studies have considered them as an indicator of colonization (but see Jonsell & Weslien, ; Eriksson et al., , ). To our knowledge, this study is the first to contrast flight intercept trap catches with the density of emergence holes in plantations subjected to thinning treatments producing relatively fine woody debris.…”

Section: Discussionmentioning

confidence: 99%

“…Both directly and indirectly, thinning will also affect several forest processes such as decomposition and mineralization (Thibodeau et al., ), species dispersal (Pothier, ), species fitness and trophic interactions (Moreau et al., ; Moreau & Quiring, ) as well as resource availability (Thibault & Moreau, ). Thus, we may suspect that one or several of these processes can produce documented increases in abundance and diversity of organisms following commercial thinning treatments (Hindmarch & Reid, ; Sullivan et al., ; Pothier, ). However, given the small size of the debris produced by thinning, there is a possibility that the latter can act as an ecological trap by attracting species without fulfilling their ecological needs (Schlaepfer et al., ).…”

Section: Introductionmentioning

confidence: 99%

Settling in or passing through: differentiating between wood‐boring beetle visitation and colonization after a dead wood pulse

Gandiaga

Thibault

Nadeau

et al. 2018

Entomologia Exp Applicata

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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. In a manipulative field study, we surveyed the response of wood‐boring beetles (Coleoptera) to the small debris produced by commercial thinning operations in white spruce plantations using two methods. First, we sampled the wood‐boring beetles visiting the plantations using flight intercept traps. Then, at the end of the resource pulse in fresh woody debris, we documented the abundance of beetle emergence holes on vertical and horizontal woody debris, which indicate wood‐boring beetle colonization. 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. Only small‐body beetles colonized the horizontal debris and most debris were not colonized. Vertical dead wood, even if present in relatively small 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 importance of distinguishing between species visitation and colonization following a resource pulse when sampling relies on indirect trapping methods.

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“…Thinning treatments conducted during the summer and winter may significantly increase populations of Hylastes spp., vectors of Leptographium and Grosmannia spp. These two fungi are known to contribute to SPD by triggering plants to release defensive volatile compounds …”

Section: Discussionmentioning

confidence: 99%

“…These two fungi are known to contribute to SPD by triggering plants to release defensive volatile compounds. 31 Generally, thinning is recommended as a bark beetle management strategy because it decreases tree competition, promotes a higher level of vigor in remaining trees, removes trees that are susceptible to fungi and insects and decreases the infestation rates of remaining trees. 12,32,33 In recent years, row thinning operations have been preferred in young pine plantations owing to the speed and associated economic benefits.…”

Section: Discussionmentioning

confidence: 99%

The effect of thinning and clear-cut on changes in the relative abundance of root-feeding beetle (Coleoptera: Curculionidae) in Pinus taeda plantations in central Alabama and Georgia

2013

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This study reports on the relative abundance responses of pathogen-vectoring root-feeding beetles to a thinning and clear-cut treatment in P. taeda stands. Thinning treatments conducted during the summer and winter may increase the relative abundance of Hylastes spp., vectors of Leptographium and Grosmannia spp., which are known to contribute to SPD by triggering plants to release defensive volatile compounds.

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Thinning of mature lodgepole pine stands increases scolytid bark beetle abundance and diversity

Cited by 33 publications

References 29 publications

Habitat loss decreases predator–prey ratios in a pine‐bark beetle system

Habitat loss decreases predator–prey ratios in a pine‐bark beetle system

Settling in or passing through: differentiating between wood‐boring beetle visitation and colonization after a dead wood pulse

The effect of thinning and clear-cut on changes in the relative abundance of root-feeding beetle (Coleoptera: Curculionidae) in Pinus taeda plantations in central Alabama and Georgia

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