What Good Is a Dead Tree? A Science Mystery

Gr 4-7–Wechsler solves the mystery of how a fallen oak tree decomposes over 50 years and creates a ecosystem. Readers learn about the central role oak trees have in their symbiotic ecosystems. He covers all levels of the ecosystem, from the tree, bacteria, and fungi to various creatures including insects, slugs, worms, squirrels, woodpeckers, chipmunks, and deer who depend on fallen trees for ­shelter, food, and more. While touted as a science mystery, questions are used as ­didactic devices that help readers learn about specific science concepts such as photosynthesis, digestion, carbon cycle, lifecycles, and ecosystems. Wechsler uses clear, age-relevant text and a range of full-color images. Fact boxes give readers more information on molecules, bacteria, and fungi. Others have information combined with ­diagrams of the carbon cycle, insect life cycles, the layers of a tree trunk, and the mold life cycle. Educators and readers will enjoy the extensive back matter: a timeline of tree decomposition, how to observe and learn from logs, a glossary, index, and bibliography of multimedia resources.