Ecosystem responses to invasion are strongly influenced by interactions between invaders and native species. If native species provide biotic resistance by consuming or competing with an invader, the invasion may be slowed, and/or invasive populations may be limited. If local herbivores recognize an invasive plant as being similar to native species, they may graze it more readily. Biotic resistance is thus generally predicted to increase if the invader is phylogenetically related to natives. However, if the native species were unpalatable, then grazers may be predisposed to avoid the invader, thus reducing biotic resistance from consumption. In the marine realm, invertebrate grazers often avoid feeding on invasive algae. However, tests comparing macroalgal invaders to phylogenetically related natives have been rare. Here we present data for invertebrate grazing and habitat use of (i) invasive Agarophyton vermiculophyllum (Rhodophyta: Gracilariales: Gracilarieae), (ii) the native contribal species Gracilaria tikvahiae, and (iii) an unrelated native, Ulva sp., the most common native alga in the system. We find that grazers prefer Ulva over both Gracilarieae, both for feeding and for habitat use. These data suggest that biotic resistance from consumption is low and not enhanced by the presence of a closely related native alga.

中文翻译：

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Grazer 与入侵的 Agarophyton vermiculophyllum (Rhodophyta) 的相互作用：与相关与不相关的本地藻类的比较

生态系统对入侵的反应受到入侵者和本地物种之间相互作用的强烈影响。如果本地物种通过消耗或与入侵者竞争来提供生物抗性，入侵可能会减慢，和/或入侵种群可能会受到限制。如果当地食草动物认为入侵植物与本地物种相似，他们可能更容易吃草。因此，如果入侵者在系统发育上与本地人相关，那么通常预测生物抗性会增加。然而，如果本地物种不好吃，那么食草动物可能倾向于避开入侵者，从而减少因食用而产生的生物抗性。在海洋领域，无脊椎动物食草动物通常避免以入侵藻类为食。然而，将大型藻类入侵者与系统发育相关的本地人进行比较的测试很少见。在这里，我们提供了无脊椎动物放牧和栖息地利用的数据 (i) 侵入性 Agarophyton vermiculophyllum (Rhodophyta: Gracilariales: Gracilariaeae)，(ii) 本地部落物种 Gracilaria tikvahiae，以及 (iii) 一种不相关的本地，Ulva sp.，最常见的系统中的原生藻类。我们发现食草动物更喜欢石莼而不是江蓠科，无论是饲养还是栖息地。这些数据表明，来自消费的生物抗性很低，并且不会因存在密切相关的本地藻类而增强。用于饲养和栖息地。这些数据表明，来自消费的生物抗性很低，并且不会因存在密切相关的本地藻类而增强。用于饲养和栖息地。这些数据表明，来自消费的生物抗性很低，并且不会因存在密切相关的本地藻类而增强。