Introduction: Gradients as Ecological Tools, revisited
Lectures in Ecology will review material covered in BIO 182, reminding students of the gradient and the causes of climatic and ecological variation with elevation. This module will extend beyond material presented in BIO 182 with two quantitative exercises. First, students will use weather station data to calculate potential evapotranspiration (PET, Penman equation) and will compare PET, mean annual temperature, mean annual precipitation, and vegetation type along the CHM Gradient with climate and life zones that occur globally, so that they understand how well the CHM Gradient represents a slice through some of the major temperate ecosystems of the world. Second, students will analyze data from permanent vegetation plots and arthropod pitfall traps using diversity and evenness indices (Southwood 1978) built into a Biodiversity Excel worksheet provided to them.