From the strange hypotheses department. Flowers struggle to set seed at the upper limit of their altitude range so we assume: it’s too warm there (too close to the sun?); they are flowering too early for pollinator activity; they are at the extreme limit of their range… Guess which option appeals to our Washingtonian researchers?
University of Washington researcher Elinore Theobald is studying the relationship between flowers and their pollinators on Washington’s highest mountain. And what she is finding so far — avalanche lilies at higher elevation set seed at one-third the rate of lilies elsewhere on the mountain — points to troubling questions.
Is it possible that the lilies are struggling because of a mismatch in their timing with their pollinators? And does that, in turn, point to trouble as the climate changes?
Theobald, a doctoral candidate, is working with field assistants Natasha Lozanoff and Margot Tsakonas to understand not just how a single species might be affected by even small changes in temperature, but how biological interactions between species respond to changing climates.
It is, if you will, a burning question: The average annual temperature in the Pacific Northwest has increased 1.5 degrees Fahrenheit since 1920, and is projected to increase an additional 3.6 to 7.2 degrees or more by the end of the century, according to the Climate Impacts Group at the University of Washington.
What might that mean for plant and animal communities? One way to find out is to head to the mountain, Theobald figured, where the range in elevation can be a proxy for the shifts in climate that are forecast.
She posits that understanding how plant and pollinator interactions are playing out at those different elevations today might be a clue to what will occur in the future. And if you love avalanche lilies, it might not be good.
