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Home NEWS Science News Biology

UBCO researchers concerned about prey and predator species in post-fire logging areas

Bioengineer by Bioengineer
September 23, 2020
in Biology
Reading Time: 3 mins read
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Salvage harvesting damages vital habitat for wildlife species

IMAGE

Credit: Photo credit Angelina Kelly.

New research from UBC Okanagan shows that salvage logging on land damaged by wildfires has negative impacts on a variety of animals.

While post-fire salvage logging is used to mitigate economic losses following wildfire, Karen Hodges, a biology professor in the Irving K. Barber Faculty of Science, says the compounded effects of wildfire and post-fire salvage logging are more severe than what wildlife experience from fire alone.

Wildfires have been increasing in prevalence and severity in recent decades, Hodges says, and salvaging trees after a fire is a common practice. However, the scale and intensity of post-fire logging removes important regenerating habitat for a variety of forest species.

“When trees are removed from a newly burned landscape, birds and mammals lose the last remnants of habitat,” she adds. “Salvage logging decreases forest biodiversity and changes ecological processes of post-fire forest regeneration. Mosaics of regenerating forest are changed through the removal of standing and downed trees, which would naturally remain on the landscape following fire.”

Hodges notes while BC’s logging industry is heavily regulated, harvesting differs between normal harvests and post-fire logging. More frequent wildfires mean an increase in post-fire salvage logging.

“Salvage logging is often done urgently as harvesters attempt to get burned timber to market before the wood deteriorates,” she says. “Salvage logging is also done at larger scales and intensities than a standard harvest. This post-fire harvest means wildlife species that can manage after a wildfire do not rebound as quickly from this second disturbance.”

The research led by master’s student Angelina Kelly studied populations of snowshoe hares and red squirrels in post-fire and salvage-logged areas of the Chilcotin–an area severely impacted by wildfires in 2010 and 2017. Hares and squirrels are important species because predators such as coyote, bobcats, marten, lynx, goshawks and great horned owls rely on them to survive.

“The main concern of a snowshoe hare is to avoid predators. Hares select stands with protective vegetation cover and avoid open areas like clearcuts–even if those areas provide food,” says Kelly. “Because of their need for vegetative cover, snowshoe hare populations decrease immediately following fires, clearcut logging or salvage logging.”

Their study area, about 32,000 hectares on the eastern edge of the Chilcotin Plateau, was ravaged by wildfire in 2017. While looking for evidence of hares and squirrels, the researchers also conducted vegetation surveys to quantify important habitat attributes in mature forests, burned forest and areas where salvage logging had taken place.

“Post-fire salvage logging greatly changed the habitat structure of post-fire stands, removing vegetative cover and rendering those sites unsuitable for hares and red squirrels,” says Kelly. “The post-fire salvage-logged areas supported no hares or red squirrels for at least eight to nine years after the initial wildfire. Burn areas where no post-fire harvesting took place supported low densities of hares and red squirrels by that time.”

This loss of prey species contributes to declines in forest predators such as lynx, marten and owls, as Hodges and her team have documented in this region and other studies.

Hodges and Kelly stress that any trees or vegetation left after a wildfire are critical for wildlife immediately after a fire, and promote a healthy mosaic of post-fire habitat. Residual trees facilitate regeneration of burned areas, while also supporting wildlife.

###

Their research was published recently in Forest Ecology and Management, and was funded by grants from the Habitat Conservation Trust Foundation and the Natural Sciences and Engineering Research Council of Canada.

Media Contact
Wellborn, Patty
[email protected]

Original Source

https://news.ok.ubc.ca/2020/09/23/ubco-researchers-concerned-about-important-prey-and-predator-species-in-post-fire-logging-areas

Related Journal Article

http://dx.doi.org/10.1016/j.foreco.2020.118272

Tags: BiodiversityBiologyClimate ChangeEcology/EnvironmentForestryPlant Sciences
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