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首页> 外文期刊>Marine biology >Little giants: a rapidly invading seagrass alters ecosystem functioning relative to native foundation species
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Little giants: a rapidly invading seagrass alters ecosystem functioning relative to native foundation species

机译：小巨人：迅速入侵的海草改变了相对于本土基础物种的生态系统

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The spread of invasive species is a major component of global ecological change and how and when to manage particular species is a difficult empirical question. Ideally, these decisions should be based on the specific impacts of invading species including both their effects on native competitors and how they may or may not play similar roles in broader ecosystem functioning. Halophila stipulacea is an invasive seagrass currently spreading through the Caribbean, and as seagrasses are foundation species, the effects of invasion have the potential to be particularly far-reaching. To evaluate the impacts of H. stipulacea we quantified spread and potential for displacement of native seagrasses as well as the effects of invasion on multiple ecosystem processes, particularly resource support for higher trophic levels and habitat creation. Long-term monitoring suggested that H. stipulacea likely displaces some native seagrasses (Syringodium filiforme and Halodule wrightii), but not others. Halophila stipulacea had lower N and protein levels and higher C:N ratios than native seagrasses, and as such is a poorer quality resource for consumers. We also observed significantly lower consumption of H. stipulacea than the native S. filiforme but limited differences compared to Thalassia testudinum. We found H. stipulacea created a more nutrient limited environment than T. testudinum and there were significantly distinct invertebrate assemblages in native- and invasive-dominated seagrass beds, but no difference in species richness or invertebrate biomass. These results suggest that the spread of H. stipulacea would impact a variety of ecological processes, potentially restructuring seagrass ecosystems through both direct impacts on environmental conditions (e.g., nutrient availability) and indirect food web interactions.
机译：侵入物种的传播是全球生态变革的主要成分，以及如何管理特定物种是一个艰难的经验问题。理想情况下，这些决定应基于入侵物种的具体影响，包括它们对本机竞争对手的影响以及它们在更广泛的生态系统运行中可能或可能不会发挥类似的角色。哈洛米拉夏季西亚是目前通过加勒比蔓延的侵入性海草，随着海草是基础物种，侵袭的影响有可能特别深远。评估H.恒舒培的影响我们量化的蔓延和潜力对土着海草的流离失所以及侵袭对多种生态系统过程的影响，特别是资源支持，对更高的营养水平和栖息地创作。长期监测表明H.Tipulacea可能取代某些原生海草（红细胞和Halodule Wrightii），而不是其他人。嗜睡脂肪酸脂肪酸的N和蛋白质水平较低，C：N比原生海草的比例较低，因此对消费者来说是一种较差的质量资源。我们还观察到H.恒定的脂肪酸消耗明显低于天然的S. Filiforme但与Thalassia Testudinum相比有限的差异。我们发现H.Tipulacea创造了比T. Tastudinum更具营养有限的环境，并且在天然和侵入式主导的海草床中显着明显不同，但物种丰富性或无脊椎动物生物量没有差异。这些结果表明，H.恒平的扩散将影响各种生态过程，通过直接影响环境条件（例如，营养可用性）和间接食品网相互作用来影响海草生态系统。

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