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Invasional meltdown: an experimental test and a framework to distinguish synergistic, additive, and antagonistic effects
Hydrobiologia ( IF 2.6 ) Pub Date : 2019-11-05 , DOI: 10.1007/s10750-019-04107-x
Raul Rennó Braga , Vanessa Maria Ribeiro , André Andrian Padial , Sidinei Magela Thomaz , Igor de Paiva Affonso , Juliana Wojciechowski , Luiz Guilherme dos Santos Ribas , Eduardo Ribeiro Cunha , Vanessa Graciele Tiburcio , Jean Ricardo Simões Vitule

The potential role of positive interactions among co-invaders is at the core of the invasional meltdown hypothesis. The interaction of non-native species could result in an exacerbation of each other’s effects. Thus, the resulting effect of multiple non-native species on ecosystems can be greater than the sum of their individual effects. We designed an analytical framework and a set of mesocosm experiments to assess the potential synergistic effects of three non-native species ( Limnoperna fortunei , Astronotus crassipinnis , and Hydrilla verticillata ) in a highly invaded floodplain in southern Brazil. We analyzed ecosystem, community, and population attributes in scenarios with non-natives. Our hypothesis of a synergistic effect was not supported. Even though effects of the invasive species were detected for all ecological levels, evidence indicated that these effects were additive. In addition to adding to the statement that origin (i.e., native vs. non-native status) does matter, we provide a tool to differentiate additive, synergistic, and antagonistic effects in situations with multiple invasions, and experimentally demonstrate additive effects of non-native species at different ecological levels.

中文翻译:

入侵性崩溃:区分协同、相加和拮抗作用的实验测试和框架

共同入侵者之间积极互动的潜在作用是入侵崩溃假说的核心。非本地物种的相互作用可能导致彼此影响的加剧。因此,多个非本地物种对生态系统的影响可能大于它们各自影响的总和。我们设计了一个分析框架和一组中观实验,以评估三种非本地物种(Limnoperna Fortunei、Astronotus crassipinnis 和 Hydrilla verticillata)在巴西南部高度入侵的洪泛区的潜在协同效应。我们分析了非本地人情景中的生态系统、社区和人口属性。我们的协同效应假设没有得到支持。尽管在所有生态层面都检测到了入侵物种的影响,证据表明这些影响是相加的。除了添加来源(即本地与非本地状态)确实重要的声明之外,我们还提供了一种工具来区分多重入侵情况下的加性、协同和拮抗作用,并通过实验证明非本地状态的加性效应不同生态水平的本地物种。
更新日期:2019-11-05
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