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Risks from competitively inferior immigrant populations: Implications of mass effects for species conservation

机译：来自劣等移民人口的风险：质量效应对物种保护的影响

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Many species are maintained by a rain of propagules from a source population and thereby persist in a location from which they would ordinarily be excluded by competition. This is one explanation for the persistence of competitively inferior domestic species in natural environments. The purpose of our study was to estimate the effect of immigrant populations on competitively superior wild species in terms of the risks of decline-the quasiextinction risk-of the wild population and the quasiexplosion risk of the immigrant population. A simple mathematical model of escape and competition demonstrates that the risks to a wild population may be appreciable. We found that even when the species maintained by mass effects is not viable in the absence of competition and immigration, low escape rates (e.g., enough to give the invasive population a net positive growth rate) can make a wild-competing species vulnerable within 10 years. The probability that the immigrant population will exceed lower bounds increases rapidly with rates of escape and growth. [References: 25]
机译：许多物种通过源种群的繁殖体的雨来维持，并因此而存在于通常被竞争排除在外的位置。这是自然环境中劣等竞争性物种持续存在的一种解释。我们研究的目的是根据野生种群下降的风险（准灭绝风险）和移民种群的准爆炸风险，评估移民种群对竞争优势野生物种的影响。一个简单的逃避和竞争数学模型表明，野生种群面临的风险可能是可观的。我们发现，即使在没有竞争和移民的情况下，靠质量效应维持的物种不可行时，低逃逸率（例如足以使入侵种群获得净正增长率）也可能使野生竞争物种在10天内变得脆弱年份。移民人口越过下界的可能性随着逃逸和增长的速度而迅速增加。 [参考：25]

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