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首页> 外文期刊>Journal of Experimental Marine Biology and Ecology >Nutrients and herbivory, but not sediments, have opposite and independent effects on the tropical macroalga, Padina boryana
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Nutrients and herbivory, but not sediments, have opposite and independent effects on the tropical macroalga, Padina boryana

机译：营养和草食对热带巨藻Padina boryana具有相反和独立的作用，但对沉积物没有影响

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摘要

Multiple anthropogenic stressors including overfishing, nutrient loading, and sediments are major drivers that may support the proliferation of macroalgae on coral reefs; however, few studies have investigated all three simultaneously. We evaluated the effects of all three stressors (nutrient enrichment, small and large sediment grain sizes, and herbivory) on biomass accumulation of the dominant coral reef macroalga Padina boryana in a multifactorial field experiment on a fringing reef in Mo'orea, French Polynesia. Biomass accumulation of P. boryana was controlled by the separate, but not interactive, effects of herbivory and nutrients; although we did not detect effects of sediments, these may have been obscured by high variability leading to low statistical power. With herbivores, biomass remained the same or decreased up to 50% in 12 days compared to similar to 50-100% increases in biomass without herbivores. Overall, enriched P. boryana grew similar to 4-fold greater compared to ambient treatments, both with and without herbivory. Our results suggest that any release from bottom-up and/or top-down controls that may occur simultaneously on these nearshore reefs may facilitate proliferation of this tropical macroalga, and, in contrast to the prevailing paradigm, we found these effects can function independently.
机译：多种人为压力源，包括过度捕捞，营养物和沉积物，是可能导致大型藻类在珊瑚礁上繁殖的主要驱动力；但是，很少有研究同时调查这三个方面。我们在法属波利尼西亚Mo'orea的边缘礁多因素田间试验中，评估了所有三种压力源（营养物富集，沉积物颗粒大小的小和草食性）对主要珊瑚礁大藻Padina boryana生物量积累的影响。食草假单胞菌的生物量积累受食草和养分的单独作用（而非相互作用）控制；尽管我们没有检测到沉积物的影响，但这些变化可能已被高变异性掩盖了，从而导致较低的统计功效。食草动物的生物量在12天之内保持不变或减少高达50％，而无食草动物的生物量增加了50-100％。总体而言，无论是否使用除草剂，富集的体育假单胞菌与环境处理相比增长了近四倍。我们的结果表明，可能同时发生在这些近海礁石上的自下而上和/或自上而下的控制措施的任何释放都可能促进这种热带大型藻类的繁殖，并且与流行的范例相反，我们发现这些作用可以独立发挥作用。

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