ScienceDaily (Oct. 4, 2009) — The catastrophic decline around the world of “apex” predators such as wolves, cougars, lions or sharks has led to a huge increase in smaller “mesopredators” that are causing major economic and ecological disruptions, a new study concludes.
Loss Of Top Predators Causing Surge In Smaller Predators, Ecosystem Collapse
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There’s an excellent book on this subject: Where The Wild Things Were by William Stolzenburg. It is really well done and readable, and shows that large predators are one of the most important shapers of whole ecosystems.