Biology 2483A Study Guide - Midterm Guide: Isogamy, Stoma, Greater Prairie Chicken

• School: Western University
• Department: Biology
• Course: Biology 2483A
• Professor: Hugh Henry

Document Summary

Maxims: organisms interact and are interconnected, everything goes somewhere, no population can increase in size forever, finite energy and resources result in trade-offs, organisms evolve, communities and ecosystems change over time, spatial scale matters. Net primary productivity (npp): energy captured by producers, minus the amount lost as heat in cellular respiration. Energy moves through ecosystems in a single direction can"t be recycled, but nutrients are recycled. Deformity and decline in amphibian populations: a case study. Observation of pacific tree frogs suggested that a parasite (ribeiroia ondatrae, a trematode flatworm) can cause deformities. Glass bead that mimicked parasite showed deformities. Deformities of pacific tree frogs occurred only in ponds which also had an aquatic snail, planorbella tenuis, the intermediate host of the parasite. Controlled experiment: tree frog eggs were exposed to ribeiroia parasites in the lab evidence that parasite caused deformities.