Overview

Symbiosis, the sustained and intimate associations between unrelated life forms, is now recognized as a ubiquitous phenomenon, one that has shaped evolution since the origin of life and that continues to affect all species. This overview of symbiosis starts with a quick history of relevant early discoveries and researchers, and considers why symbiosis was so long neglected as a respectable topic of biological research and why it was a controversial topic. Today, symbiosis is widely appreciated as being everywhere in nature and as a pervasive influence on ecological communities. One chapter explores the fundamental drivers that lead to symbiotic associations, using examples to illustrate the nature of services exchanged between symbiotic partners. Another considers the evolutionary stability of symbiotic partnerships, which can quickly decay in the face of symbiotic cheating. A full chapter is devoted to the most consequential of all symbioses: the origin of the complex (eukaryotic) cell, and the origin of chloroplasts and green plants. Other triumphs of symbiosis described include the root-fungus associations that enabled plants to colonize land 450 million years ago, gut microbial communities that empower animals to utilize a wide range of foods, including plant fiber wood and sap, and coral-algal symbioses that resulted in the rise of coral reefs.

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Nancy A. Moran is the Raymer Endowed Chair in Integrative Biology at the University of Texas-Austin. She holds a PhD from the University of Michigan. Her honors include membership in the US National Academy of Sciences and the American Academy of Arts and Sciences, a MacArthur fellowship, the International Prize for Biology, and the Selman Waksman award in microbiology. Moran's research is on symbiosis, especially that between insects and microbes. She explores how symbioses have shaped and continue to shape insect evolution and insect populations. SUZIE ALTHENS records from her professional studio in Alaska, near the beautiful Matanuska Glacier. She narrates regularly for major publishers and specializes in audiobooks and e-learning. Suzie is enthusiastic about narrating nonfiction as it provides opportunities to share amazing memoirs, medical discoveries, and inspiration, but she also enjoys mysteries and women's fiction. Suzie narrates children's encyclopedias and donates time to narrate children's fiction for Learning Ally, a nonprofit organization, when she has the opening to woo the reluctant young reader. SUZIE ALTHENS records from her professional studio in Alaska, near the beautiful Matanuska Glacier. She narrates regularly for major publishers and specializes in audiobooks and e-learning. Suzie is enthusiastic about narrating nonfiction as it provides opportunities to share amazing memoirs, medical discoveries, and inspiration, but she also enjoys mysteries and women's fiction. Suzie narrates children's encyclopedias and donates time to narrate children's fiction for Learning Ally, a nonprofit organization, when she has the opening to woo the reluctant young reader.

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