Windows to the Atmosphere: Stomatal Ecology Across Leaf Surfaces and Climates

<p data-end="797" data-start="169"><em data-end="248" data-start="169">Windows to the Atmosphere: Stomatal Ecology Across Leaf Surfaces and Climates</em> is an inquiry-based laboratory module designed for upper-level undergraduate courses in ecology, plant biology, and environmental science. The module engages students in investigating how stomatal traits—density, size, and distribution across adaxial and abaxial leaf surfaces—reflect plant functional adaptations to environmental conditions. Using clear nail polish or similar techniques, students create stomatal impressions from leaves, quantify stomatal characteristics using microscopy, and analyze trait variation across species and habitats.</p> <p data-end="1368" data-start="799">Through guided hypothesis testing and data analysis, students connect stomatal structure and function to ecological trade-offs between carbon gain and water loss, and to broader environmental gradients such as light availability, moisture, temperature, and atmospheric CO₂. The module can be completed as a standalone laboratory exercise or expanded into a course-based undergraduate research experience (CURE), in which students grow plants from diverse climatic origins, collect multi-week datasets, and test climate–trait relationships using real environmental data.</p> <p data-end="1815" data-start="1370">This module emphasizes authentic ecological practices, including experimental design, quantitative analysis, and scientific communication, while reinforcing core ecological and evolutionary concepts. Adaptable to a range of course levels and institutional contexts, <em data-end="1663" data-start="1636">Windows to the Atmosphere</em> provides students with hands-on experience in plant functional ecology and illustrates how organismal traits mediate responses to environmental change.</p>