Factors governing rate of invasion: a natural experiment using Argentine ants
Factors governing rate of invasion: a natural experiment using Argentine ants
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DOI：
10.1007/s004420050509
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发表时间：
1998-06-01
期刊：
影响因子：
2.7
通讯作者：
Holway, DA
中科院分区：
文献类型：
--
作者：
Holway, DA
预测生物入侵的成功是入侵生物学的主要目标。然而，由于入侵过程的复杂性和时空异质性，确定入侵的原因可能很困难。本研究的目的是评估阿根廷蚂蚁（Linepithema humile），一种广泛的入侵物种的入侵率的影响因素。在北方加州的下游萨克拉门托河谷的河岸林地中，对20个独立的阿根廷蚂蚁种群的入侵率进行了4年的测量。入侵率的先验预测因子包括流量（非生物适宜性的衡量），干扰和本地蚂蚁丰富度。此外，诱饵被用来估计丰富的阿根廷蚂蚁和本地蚂蚁在20个网站。一个多元回归模型占近一半的平均侵袭率的变化（R-2 = 0.46）？但在这项分析中，河流流量是唯一重要的因素。阿根廷蚂蚁传播，平均16米年（-1）在网站与永久性流和撤退，平均-6米年（-1）在网站与间歇性流。入侵率是独立的干扰和本地蚂蚁丰富度。阿根廷蚂蚁招募到更多的诱饵在入侵地区的数量比本土蚂蚁在未入侵的地区。此外，入侵率呈正相关的比例，诱饵招募的本地蚂蚁在未入侵的地区。总之，这些研究结果表明，非生物的适合性是至关重要的，在确定入侵率的阿根廷蚂蚁。
Predicting the success of biological invasions is a major goal of invasion biology. Determining the causes of invasion's, however, can be difficult, owing to the complexity and spatio-temporal heterogeneity of the invasion process. The purpose of this study was to assess factors influencing rate of invasion for the Argentine ant (Linepithema humile), a widespread invasive species. The rate of invasion for 20 independent Argentine ant populations was measured over 4 years in riparian woodlands in the lower Sacramento River Valley of northern California. A priori predictors of rate of invasion included stream flow (a measure of abiotic suitability), disturbance, and native ant richness. In addition, baits were used to estimate the abundance of Argentine ants and native ants at the 20 sites. A multiple regression model accounted for nearly half of the variation in mean rate of invasion (R-2 = 0.46)? but stream flow was the only significant factor in this analysis. Argentine ants spread, on average, 16 m year(-1) at sites with permanent stream flow and retreated, on average, -6 m year(-1) at sites with intermittent stream flow. Rate of invasion was independent of both disturbance and native ant richness. Argentine ants recruited to more baits in higher numbers in invaded areas than did native ants in uninvaded areas. In addition, rate of invasion was positively correlated with the proportion of baits recruited to by native ants in uninvaded areas. Together, these findings suggest that abiotic suitability is of paramount importance in determining rate of invasion for the Argentine ant.