Autumn is here and resistance is futile. Nights are colder, days are shorter, and swimmers at the nude dock on Lost Lake are fewer and goosebumpier. Look closely, and youll even see yellow tinges on the cottonwood leaves.
Yellow tinges. Not gold, and never orange or red. Even at the height of fall, local cottonwoods and alders add only small dashes of colour to Whistlers hillsides. For a proud Canadian steeped in the images of Tom Thomson and the Group of Seven, somethings missing.
Back east, autumns brilliant oranges and reds inspire artists, poets, and tourism marketing boards. Thats why you dont need to be Dudley Doright to deduce the red maple leaf on Canadas flag was chosen by an easterner. Especially since the stylized leaf represents a sugar maple, a tree famous for turning fiery red in fall and not often found west of the Ontario-Manitoba border. (Theres a historical irony in the truth. The maple leaf was first adopted as the symbol of Quebecs nationalist St. Jean Baptiste Society in 1834.)
Without the easts colourful mix of maple, birch, beech, and oak, autumns in the Coast Mountains arent notably picturesque or paintable. In fact, with the exception of the cottonwoods and alders (and some planted aspens and eastern maples), things here look pretty much the same year-round. The conifer-dominated forests remain evergreen.
So what gives? Why are our forests so dominated by conifers? The answer is complex (another way of saying I dont know for sure) and combines geology, glacial history, soil, and climate.
The Coast Mountains are comprised mostly of acidic bedrocks, especially granites and granodiorites. Acidic rock and recent deglaciation result in young, acidic soils (mainly Podzols) which favour conifers over deciduous trees.
But theres a chicken-and-egg aspect to this explanation. What came first: acidic soil, or plants causing acidic soil? Our two dominant plant families, the pines and heaths (Pinaceae and Ericaceae), both thrive on acidic, low-nutrient soil. Both also produce nutrient-poor litter which acidifies the soil. In contrast, deciduous trees produce leaves which tend to reduce soil acidity and increase soil nutrients.
Our climate also contributes to the dominance of conifers. Whistler skiers are intimately familiar with wet snow measured in cementimetres. The rain-soaked snowpack develops early and insulates the ground from freezing. Unfrozen soil allows conifers to photosynthesize while deciduous trees are leafless. In spring, a conifer can start photosynthesizing even while its base is covered by snow.
Whatever the exact cause, we are rich in conifers and poor in deciduous trees. And the wests conifer-dominated mountains apparently didnt impress the Group of Seven much. When some of the Group, justifiably famous for their faithful representation of the beauty and warmth of eastern fall colours, visited the Rockies in the 1920s, they painted a cold and remote place. Just check Lawren Harriss stark, foreboding shapes rendered in cool blues and whites, dark greens, and black.
We obviously view our mountain landscape differently. And, though the display is more subtle, our so-called evergreen forests offer a fall beauty of their own. Here its the shrubs that provide most of the colour: huckleberries, dogwoods, and a host of other species dapple crimsons and oranges into forest openings, sub-alpine meadows, and stream banks. And even though our autumn landscapes never graced the canvasses of the Group of Seven, that neednt stop you from toting your palette and easel into the woods to create your own Canadian classic.
Monthly Bird Walk The next bird walk will take place Saturday, Oct. 2nd and will start at the later fall/winter time of 8 a.m. Join Whistler experts in the monthly update of our feathered locals and migrants. For details, contact Michael Thompson at 604-932-5010.
Calling all Aspiring Nature Writers and Photographers Have an interest in natural history? Want to educate others about your favourite flora and/or fauna? Write your very own Naturespeak article or send us your photos to accompany our articles. For more information contact Sorcha Masterson at 604-932-5089 or firstname.lastname@example.org