The forest canopy above us holds secrets most people never notice—miniature ecosystems thriving on tree trunks that tell profound stories about our changing world. In this eye-opening conversation with Dr. Yolanda Wiersma, professor of biology at Memorial University in Newfoundland, we venture into the fascinating realm of landscape ecology and lichen biodiversity.
Dr. Wiersma introduces us to landscape ecology—a discipline studying interactions between living things and their environments at scales visible from airplane windows. From the rolling hills and forests to human developments cutting across them, these patterns shape everything living beneath the canopy. Her work bridges traditional scientific approaches with Indigenous knowledge, leading to remarkable discoveries in unexpected places.
The heart of our discussion revolves around lichens—organisms far more complex than most realize. These aren't single lifeforms but miniaturized ecosystems combining fungi, algae, and sometimes bacteria from three different kingdoms. Dr. Wiersma's passion shines as she describes how these slow-growing organisms "eat the air" through photosynthesis while producing hundreds of unique chemical compounds, some with antimicrobial properties so effective that birds line their nests with them to protect vulnerable chicks.
Perhaps most surprising is Dr. Wiersma's discovery of a lichen biodiversity hotspot in central Newfoundland—an area previously overlooked by scientists until a member of the Qalipu First Nation reached out with photographs of rare specimens. This collaboration led to documenting 175 species in a region not previously known for lichen diversity, highlighting how traditional knowledge enriches scientific understanding.
Whether you're a nature enthusiast, someone curious about the hidden workings of our forest ecosystems, or simply appreciate learning about overlooked wonders in our natural world, this conversation will transform how you see the trees around you. Listen now to discover the miniature worlds thriving silently above our heads and what they can teach us about our changing planet.