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Lincoln Park Zoo
Why frog populations are declining
Why frog populations are declining

Regarding Timothy B. Wheeler's recent article on declining amphibian populations, the mysterious disappearance of many frogs may be due to an invasive plant species known as buckthorn ("Alarming U.S. decline seen in environment's sentinels," May 23). Buckthorn was imported from Europe in the 19th century and was initially employed for garden hedges. But since then it has spread throughout the woodlands of America. Buckthorn is notorious for shading other native plants, inhibiting their growth and allowing increased visibility for amphibian predators. Research by Seth Magle of the Lincoln Park Zoo confirms denser numbers of predators wherever buckthorn resides. ...

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