Comparative Functional Responses Predict the Invasiveness and Ecological Impacts of Alien Herbivorous Snails.
Comparative Functional Responses Predict the Invasiveness and Ecological Impacts of Alien Herbivorous Snails.
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比较功能反应预测外来草食性蜗牛的入侵和生态影响
DOI：
10.1371/journal.pone.0147017
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发表时间：
2016
期刊：
影响因子：
3.7
通讯作者：
Hu Y
中科院分区：
文献类型：
--
作者：
Xu M;Mu X;Dick JT;Fang M;Gu D;Luo D;Zhang J;Luo J;Hu Y
了解外来物种的入侵和生态影响的决定因素是生态学中最受欢迎和最紧迫的研究问题之一。几项研究表明，比较外来和本地捕食者对本地猎物的功能反应（FR）的价值，然而，该技术与食草性外来物种和作为一个预测的入侵性，不同于生态影响的探索不足。在这里，在中国，我们进行了一个围隔实验，以比较三种草食性蜗牛物种之间的FR：金苹果蜗牛，福寿螺，一种高度入侵和高影响的外来物种列入“100个世界上最严重的外来入侵物种”; Planorbarius corneus，一种非入侵，低影响的外来物种;和中国本土蜗牛，铜锈环棱螺，当喂养四个本地发生的植物物种。此外，通过使用数值响应方程，我们模拟了蜗牛消费者的人口动态。对于标准FR参数，我们发现，入侵和破坏性的外来蜗牛有最高的“攻击率”，最短的“处理时间”h和最高的估计最大摄食率，1/hT，而本地物种有最低的攻击率，最长的处理时间和最低的最大摄食率。非侵入性的，低影响的外来物种有一贯的中间FR参数。外来入侵物种的种群增长潜力高于本地螺种，而非外来入侵物种的种群增长潜力介于两者之间。因此，虽然比较FR方法已被提出作为一种可靠的方法来预测入侵捕食者的生态影响，我们的研究结果进一步表明，比较FR可以扩展到预测外来食草动物的入侵性和生态影响，并应探讨在其他类群和营养组，以确定该方法的一般效用。
Understanding determinants of the invasiveness and ecological impacts of alien species is amongst the most sought-after and urgent research questions in ecology. Several studies have shown the value of comparing the functional responses (FRs) of alien and native predators towards native prey, however, the technique is under-explored with herbivorous alien species and as a predictor of invasiveness as distinct from ecological impact. Here, in China, we conducted a mesocosm experiment to compare the FRs among three herbivorous snail species: the golden apple snail, Pomacea canaliculata, a highly invasive and high impact alien listed in “100 of the World's Worst Invasive Alien Species”; Planorbarius corneus, a non-invasive, low impact alien; and the Chinese native snail, Bellamya aeruginosa, when feeding on four locally occurring plant species. Further, by using a numerical response equation, we modelled the population dynamics of the snail consumers. For standard FR parameters, we found that the invasive and damaging alien snail had the highest “attack rates” a, shortest “handling times” h and also the highest estimated maximum feeding rates, 1/hT, whereas the native species had the lowest attack rates, longest handling times and lowest maximum feeding rates. The non-invasive, low impact alien species had consistently intermediate FR parameters. The invasive alien species had higher population growth potential than the native snail species, whilst that of the non-invasive alien species was intermediate. Thus, while the comparative FR approach has been proposed as a reliable method for predicting the ecological impacts of invasive predators, our results further suggest that comparative FRs could extend to predict the invasiveness and ecological impacts of alien herbivores and should be explored in other taxa and trophic groups to determine the general utility of the approach.