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Challenges to introducing and managing disturbance regimes for Holocarpha macradenia, an endangered annual grassland forb

机译：引入和管理濒危的一年生草地禁忌型全缘马齿en的挑战

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Introducing rare plants to new sites for conservation to offset effects of habitat destruction requires detailed knowledge of habitat requirements, plant demography, and management needs. We conducted a factorial experiment replicated at three coastal prairie sites to test the effects of clipping frequency and litter accumulation on seed germination, seedling survival, reproduction, and seedling recruitment of introduced populations of the endangered, tall-stature, annual forb, Holocarpha macradenia (DC.) E Greene.. Clipping favored H. macradenia, primarily by enhancing seed germination and flower production. Litter accumulation had no effect on seed germination, even after 5 years of treatments. Seedling recruitment was highly site specific with large numbers of recruits recorded at only one of three sites. Although recruitment of seedlings was higher in clipped plots for 2-3 years, by 4-5 years after introduction very few seedlings survived to reproduction in any treatment. We attribute this result to a combination of poor habitat quality, small population size, and lack of a seed bank. We were unsuccessful in introducing this relatively well-studied species of concern to apparently suitable habitat at multiple sites in multiple years, which suggests that translocating rare plant populations to mitigate for habitat destruction is an expensive and highly uncertain endeavor.
机译：将珍稀植物引入新的保护地点以抵消生境破坏的影响需要对生境要求，植物人口统计学和管理需求有详细的了解。我们在三个沿海大草原地区进行了析因试验，以测试剪草频率和凋落物积累对濒危，高身材，一年生Forb，Holocarpha macradenia（ DC。）E. Greene .. Clipping主要通过提高种子的发芽率和花卉产量来青睐Macradenia。即使经过5年的处理，凋落物的积累对种子发芽也没有影响。幼苗招募是高度特定于地点的，只有三个地点之一记录了大量新兵。尽管在修剪的地块中2-3年内幼苗的募集较高，但在引入后的4-5年内，在任何处理中几乎没有幼苗存活到繁殖。我们将此结果归因于栖息地质量差，人口少和缺乏种子库的综合原因。我们未能在多年内将这种经过充分研究的物种引入显然适合在多个地点的生境中，这表明，转移稀有植物种群以减轻生境破坏是一项昂贵且高度不确定的努力。

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