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When a good fire is a bad fire. Grizzlies and pine nuts

I’ve been working with a small chain saw on the trees around my upper cabin.  Most of my 6 acres is on a plateau above the main cabin.  That arcreage butts up to Shoshone National Forest.  The original owner of my cabin, Doc Firor, deeded that area to Nature Conservancy who gave it to the forest service.  That entire plateau extends for several miles and is prime elk habitat.Riddle Flat from across the river. Prime elk habitat

Almost all of the trees up there are Pinus flexilis or Limber Pine.  Limber Pine is a white bark pine, which basically means it has bunches of 5 needles.  The pine whose common name is Whitebark pine is Pinus albicaulis.  That’s the one that everybody is talking about when they say Grizzlies are dependent on the whitebark pine crop.   But Limber Pine seeds are just as tasty, and squirrels cache them just the same.  Whitebark Limber on left; doug fir on right

Pinus albicaulis and Pinus flexilis are both considered keystone species–that is, without them, an ecosystem can just cascade apart.  And both of them are being infected with an imported fungus that is the cause of white pine blister rust.  This fungus can kill a tree, and its killing massive amounts of Whitebark Pines in the Pacific Northwest.  The Rockies have not been quite as vulnerable because its so much drier here.  But with global warming, and the pine beetles, trees that are weakened by the fungus succumb quickly.My one room upper cabin.  No water. No plumbing.  Yes heat!

I was trying to find out if grizzs will eat Limber Pine nuts as well.  That was important to me, because many of my trees have the rust.  And I’m trying to find out how to identify correctly the rust, as well as how to treat the trees.  Avalanche Peak, Yellowstone.  Dead whitebark pines

I went to the National Forest administrative offices last week in Cody. They are all so helpful and nice there.  One of the supervisors lent me a new phamphlet and told me there’s a pheromone for the beetles, but nothing for the rust.  She said its awfully hard to determine the difference on the tree.

What I really want is a source of blister rust-free seedlings to underplant.  The bad news is that whitebarks take 40-50 years to begin to cone.  But I can wait.  The worse news is that if you can even find a source of seedlings, expect 50% mortality in the first few years.  In fact, the booklet has a really complicated formula to determine how many seedlings you need, based on existing site infections and super-overplanting for death.  The thing I think would be smart would be to do successive planting over a period of 5-7 years.  And since I have a test plot that could be a model for the rest of the nearby forest, I’d love it if the Forest Service used me for testing.  Robin at the Ag department told me they do test plots on private land often.

Meanwhile, I’m going on what’s said on the internet and in this phamphlet.  I’ve been limbing up by hand and by machine up to 6-8′ from the ground all of my trees (this is a several year project!), starting with around my upper cabin.  Since the trees are older, most of the bottom limbs are dead anyways.  But limbing up will provide air circulation and light, both will help the trees health.Before pruning; cabin is in the background

Another interesting thing about blister rust is the Ribes (Gooseberry) connection.  When the rust first came to this continent, in the 1930’s, they found that Ribes was a host.  So the government in their wisdom, decided to eliminate all the Ribes in the West.  But there are so many species of Gooseberry native to the West, over 150 in North America.  And Ribes is an important food for wildlife.  You could never eradicate all the Ribes, and that’s just what they found.

As I was doing all my pruning, sure enough, many many trees have Ribes growing right on top of the trunk.  Besides being a host for a nasty disease, I did have to wonder about other types of symbiotic relations between the two, for example nutrient exchange.  I haven’t learned about that yet.

Whitebark pines, including my Limber Pine, are an amazing tree.  Unlike most pines, they are not wind pollinated, but dependent upon the Clark’s Nutcracker for dispersal.  Squirrels too  cache the seeds but not as far.  They grow on thin soils, at high altitudes, and usually are the first to colonize in disturbed sites, such as fires and landslides.  Grizzlies depend on their nutritious content to fatten them up for winter, or satisfy them in the early spring.  Grizzlies can’t climb the trees to get the seed.  Instead, they are experts at finding squirrel caches and robbing them.  When I asked about my Limber Pines, a forester said that grizzlies eat their seeds, but they are rougher so they aren’t number one on the menu.  Obviously my plot as well as the forest next to me is just as important for the grizzly recovery.

The benefits of fire in this care are so mixed.  Whitebarks are fire-dependent.  Where fires have been suppressed, more shade tolerant conifers replace them and there is little opportunity for regeneration.  So they like that clear open ground.  But their cones don’t open with heat.  The seeds are animal dispersed, so there needs to be stands for their new growth, which means they like low- and moderate-intensity fires.  That’s hard to have in areas with so much beetle kill and fire suppression like my valley.  To add fuel to the fire so to speak, scorch or fire damage on trees that would otherwise live, increases their susceptibility to beetle-kill.After pruning.  Cabin is now visible. Deer will love this!

Regardless, I’m thinning away, hoping for more air circulation, light, and in addition all that thinning imitates a ground fire.  Many of the natives I would plant in California requires a good chopping back to the ground every so often to mimic fire.  That’s what I’m doing for now.

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One Response

  1. […] my favorite native flowering 3 season plant is Ribes or Gooseberry.  You may have read my post on White Blister Rust on our native white bark pines.  Ribes are a host for this European fungus.  Extensive attempts to eradicate western Ribes sp. […]

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