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首页> 外文期刊>Oceanographic Literature Review >Impacts of the non-native alga Sargassum horneri on benthic community production in a California kelp forest
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Impacts of the non-native alga Sargassum horneri on benthic community production in a California kelp forest

机译：非本土藻类霍德利霍尔尼对加州海带森林底栖群落生产的影响

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The arrival of Sargassum horneri throughout the Southern California Bight and the Baja Peninsula has raised concern regarding kelp forest resilience and ecosystem function following the invasion of this non-native species. To understand how S. horneri impacts native algal abundance and community production, we removed S. horneri from experimental plots over a period of 11 mo. We measured impacts on native algal communities and community productivity using SCUBA surveys and benthic chambers equipped with oxygen, temperature, and light sensors. We observed a nearly 4-fold increase in recruitment of Macrocystis pyrifera and a 9-fold in crease in adult M. pyrifera stipe density in S. horneri removal plots, but no discernable changes in net community production among treatments. We found ephemeral increases in gross community production and community respiration in the non-removal plots that coincided with periods of peak S. horneri biomass. To understand the temporal dynamics of community production, we de - ployed benthic chambers across a rocky reef dominated by S. horneri. Here, temporal variation in community production was most strongly related to corresponding variation in water temperature and changes in S. horneri biomass related to its annual lifecycle. Overall, our study indicates that S. horneri presence contributed to ephemeral increases in gross community production and community respiration, but it did not affect net community production. Moreover, S. horneri removal can lead to increases in native algal abundances given favorable abiotic conditions. We suggest that S. horneri thrives in a disturbed ecosystem rather than being a driver of ecosystem change.
机译：在南加州南部的南部的萨格萨鲁姆霍店的到来并在入侵这种非本地物种后对海带森林复原力和生态系统功能提出了担忧。要了解S. Horneri如何影响本土藻类丰富和社区生产，我们从11月的一段时间内从实验块中取出了S. Horneri。我们使用潜水和光传感器的水肺测量和底腔测量对本地藻类社区和群落生产力的影响。我们观察到宏型患者患者升高近4倍，在S. Horneri去除情节中的成人M.Pyrifera瘦谱度中的折痕9倍，但治疗之间的净社区生产没有可辨别的变化。我们发现群落生产和社区呼吸中的短暂增加，在不拆卸地块中，恰逢峰霍德利生物质的峰值。要了解社区生产的时间动态，我们在由S. Horneri主导的岩石珊瑚礁上进行了底层底栖床。这里，社区生产的时间变化与与其年生命周期相关的水温和S. Horneri生物量的变化最强烈相关。总体而言，我们的研究表明，S. Horneri的存在促成了群体群落生产和社区呼吸的短暂增加，但它没有影响净社区生产。此外，S. Horneri去除可以导致天然藻类丰富的增加，所述非生物条件。我们建议S. Horneri在一个受扰动的生态系统中茁壮成长，而不是成为生态系统变革的司机。

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  • 来源
    《Oceanographic Literature Review》 |2020年第9期|1984-1984|共1页
  • 作者

    G.H. Sullaway; M.S. Edwards;

  • 作者单位

    Coastal and Marine Institute Laboratory San Diego State University 5500 Campanile Drive San Diego CA 92182 United States;

    Coastal and Marine Institute Laboratory San Diego State University 5500 Campanile Drive San Diego CA 92182 United States;

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