Canadian Forest Service Publications

Vertical distribution of three longhorned beetle species (Coleoptera: Cerambycidae) in burned trees of the boreal forest. Cadorette-Breton, Y.; Hébert, C.; Ibarzabal, J.; Berthiaume, R.; Bauce, É. 2016. Can. J. For. Res. 46:564-571.

Year: 2016

Issued by: Laurentian Forestry Centre

Catalog ID: 36615

Language: English

Availability: PDF (request by e-mail)

Available from the Journal's Web site.
DOI: 10.1139/cjfr-2015-0402

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This study aimed to characterize the vertical distribution of longhorned beetle larvae in burned trees of the eastern Canadian boreal forest. Black spruce and jack pine trees burned at three severity levels were cut, and 30-cm boles were collected from the ground up to a height of 9.45 m. Boles were debarked and dissected to collect insect larvae. Results show that the three most abundant longhorned beetle species were vertically segregated among burned jack pine and black spruce trees, but the section having the highest timber value was heavily infested by woodborer larvae. Larval density distribution of Monochamus scutellatus scutellatus and of Acmaeops proteus proteus could be linked with bark thickness, which also depends on fire severity. Lightly burned stands of black spruce were the most heavily infested and should be salvaged only if they are easily accessible and can thus be rapidly harvested and processed at the mill. More severely burned stands should be salvaged later as they will be less affected by woodborers, as should jack pine which is lightly infested compared with black spruce. The ecological role of stumps should be further investigated since they could still have an ecological value after salvage logging as Arhopalus foveicollis uses them specifically.

Plain Language Summary

By studying burned black spruce and jack pine trees, researchers observed that the section of the trees having the greatest timber value was heavily infested by whitespotted sawyer larvae. Larvae tunnel into the wood, which decreases the market value of the stems.

In the boreal forest of eastern Canada, lightly burned black spruce stands were the most heavily infested. Therefore, they should be salvaged only if they can be rapidly harvested and processed at the mill, ideally within three months of the fire. Easy access to recently burned stands therefore is an important factor in determining the timber value of stands.

More severely burned black spruce stands can be salvaged later as they are less affected by the whitespotted sawyer. The same applies to jack pine stands, no matter to which extent they were burned.