Abstract

Species that are introduced into novel habitats have potentially devasting effects on ecosystem services and functions. Predicting which species and introduction events represent the largest threats are important scientific and management goals. It has been suggested that propagule pressure, the sum of individuals introduced, can be used to predict the probability of establishment success. Previous analyses of this hypothesis have often improperly used historical data by combining introductions over large spatial extents and over long time periods. We use the historical record for Common Pheasant releases in the USA to evaluate the process at scales more relevant to the problem of understanding population establishment. Introduction success varied widely among regions with histories of Common Pheasant introductions in the USA. In a series of logistic regression models involving data from the Foreign Game Investigation Program, we found no evidence to support propagule pressure when the ‘state’ in which the releases occurred was included as a random effect. There are many examples of states with large numbers of Common Pheasants that were introduced but failed to establish self-sustaining populations.

Graphic abstract

David Watmough. Dreamstime.com.

中文翻译：

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野鸡（Phasianus colchicus）引种说明繁殖压力在影响引种效果中的规模问题。

摘要

引入新的栖息地的物种可能对生态系统的服务和功能造成毁灭性的影响。预测哪些物种和引入事件构成最大威胁是重要的科学和管理目标。已经提出，繁殖压力，即所引入的个体之和，可以用来预测建立成功的可能性。通过在较大的空间范围和较长的时期内结合介绍，对该假设的先前分析经常不正确地使用了历史数据。我们使用美国“普通野鸡”版本的历史记录，以与了解种群建立问题更相关的规模评估该过程。在美国，随among鸡引进的历史不同，介绍成功的地区也各不相同。在一系列涉及外国游戏调查计划数据的逻辑回归模型中，我们发现，当将释放发生的“状态”作为随机效应包括在内时，没有证据支持繁殖压力。有许多引入了许多野鸡的州的例子，但未能建立自给自足的人口。

图形摘要

大卫·沃特莫夫。Dreamstime.com。