The jointly held Cascadia Prairie-Oak Partnership and the Northwest Scientific Association ecoregional conference is coming up on March 20-23 in Portland. Don't miss the early registration deadline on February 28. CNLM's Americorps Plant Propagation Specialist, Greg Eide is a co-author on the study below, one of many that will be presented at the conference.
"In a study that will be presented at the 2013 NWSA (CPOP) conference, several northwest lichenologists collaborated to survey macrolichen diversity on Quercus garryana. Macrolichens are lichens that are foliose, fruticose, stratified, or unstratified, and that are usually easily identifiable in the field, as opposed to microlichens such as pin and crustose lichens. For this most comprehensive oak lichen survey to date the researchers visited 9 oak stands throughout Washington, not only expanding the known ranges of many oak-associated species (e.g. Normandina pulchella), but also collecting 3 recorded for the first time in the state (e.g Collema quadrifidum). Records from herbaria and other Washington oak lichen studies were compiled to evaluate the rarity of observed species and potentially rare species known from nearby locations.
Normandina pulchella found on a Garry Oak at Joint Base Lewis-McChord (photo taken by Greg Eide).
Lichen communities are very indicative of the air quality in a given area because they rely on dry deposition for all nutrient intake, rather than having a vascular system for transporting nutrients from one part to another like plants. This allows a keen observer to distinguish sites with good air quality from sites with poor air quality by comparing the occurrence of pollution tolerant species to that of intolerant species. Air quality data plots were established at several sites enabling land managers to document air quality changes in the future. Although there are surely oak stands harboring previously undocumented species occurrences, this baseline list and subsequent discussion will help to integratelichens into current restoration and management practices along with just as integral vascular plants and animals.
The authors of the study are John Villella, Daphne Stone, Lalita Calabria, Katherine Glew, and Greg Eide."