Abstract：
Although sampling the five tallest young aspen in a stand is useful for detecting the occurrence of any aspen recruitment, this technique overestimates the population response of aspen to wolf reintroduction. Our original conclusion that random sampling described a trophic cascade that was weaker than the one described by non-random sampling is unchanged.
摘要：
尽管在一个摊位上对五个最高的年轻白杨进行采样对于检测任何白杨招募的发生都很有用，这种技术高估了白杨对狼重新引入的种群反应。我们最初的结论是，随机抽样描述的营养级联比非随机抽样描述的营养级联弱，这是不变的。
