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首页> 外文期刊>Marine ecology progress series >Mechanisms leading to recruitment inhibition of giant kelp Macrocystis pyrifera by an understory alga
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Mechanisms leading to recruitment inhibition of giant kelp Macrocystis pyrifera by an understory alga

机译：导致植物林藻植入巨型海藻麦克累累菌菌Pyrifera的机制

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摘要

The forest-forming giant kelp Macrocystis pyrifera and the communities it supports have been decreasing across their native ranges in many parts of the world. The sudden removal of giant kelp canopies by storms increases space and light for the colonization by understory macroalgae, such as Desmarestia herbacea, which can inhibit M. pyrifera recovery and alter local community composition. Understanding the mechanisms by which algae such as D. herbacea interact with M. pyrifera can provide insight into patterns of kelp forest recovery following these disturbances and can aid in predicting future community structure. This study experimentally tested the independent and combined effects of two likely competitive mechanisms by which D. herbacea might inhibit recovery of M. pyrifera in the Point Loma kelp forest in San Diego, California (USA). Specifically, we conducted field experiments to study the individual and combined effects of shade and scour by D. herbacea on the survival of M. pyrifera microscopic life stages, and the recruitment, survival, and growth of its young sporophytes. Our results show that scour had the strongest negative effect on the survival of M. pyrifera microscopic life stages and recruitment, but shade and scour both adversely affected survival and growth of these sporophytes as they grew larger. Canopy-removing storms are increasing in frequency and intensity, and this change could facilitate the rise of understory species, like D. herbacea, which might alter community succession and recovery of kelp forests.
机译：森林成型巨型海藻宏rocystis Pyrifera以及其支持的社区在世界许多地方的原生范围内一直在逐渐减少。风暴突然去除巨型海藻檐篷增加了林下植物的殖民化的空间和光线，例如Desmarestia Herbacea，其可以抑制M.Pyrifera回收和改变局部群落组合物。了解藻类如D.草酸藻与M. Pyrifera的机制可以在这些障碍之后提供对海藻森林恢复模式的洞察力，并有助于预测未来的社区结构。本研究通过D. Herbacea在加利福尼亚州圣地亚哥（美国）的点洛马海带森林中抑制了两种可能的竞争机制的独立和综合影响。具体而言，我们进行了现场实验，以研究D. Herbacea在M. pyrifera微观寿命的存活率上的个体和综合影响，以及其幼孢子体的招生，存活和生长。我们的研究结果表明，SCOUR对M. Pyrifera显微寿命和招聘的生存具有最强的负面影响，但由于它们增长更大，因此对这些孢子素的生存和生长产生了不利影响和生长的阴影和冲刷。渐变的风暴在频率和强度增加，这种变化可以促进林下物种的兴起，如紫草属，这可能会改变社区连续和海带森林的恢复。

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