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Ch. 25 Populations & Ecosystems, Cross Connection: Coastal dune plants…
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Cross Connection: Coastal dune plants are r-selected species. Their windblown seeds. land, germinate, and grow quickly and then produce many more seeds. They can grow so rapidly and reproduce so abundantly because almost no energy is spent on antiherbivore defenses or drought adaptation.
Cross Connection: The bush of Salvia leucophylla is surrounded by a zone devoid of vegetation. Allochemics given off by the salvias penetrate the top layers of soil and inhibit seed germination. If a seedling can get its roots through the top zone, the plant may grow well, but herbivory by rabbits and mice that live in the protection of the salvias become a problem.
Cross Connection: On modern American farms, plants are given optimal amounts of fertilizer and water; pesticides and insecticides keep pathogens under control, and a variety of weed-control measures eliminate competition from other species.
