Factors influencing recruitment and appearance of bull kelp, Nereocystis luetkeana (phylum Ochrophyta)
Factors influencing recruitment and appearance of bull kelp, Nereocystis luetkeana (phylum Ochrophyta)
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DOI：
10.1111/jpy.12814
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发表时间：
2019-02-01
影响因子：
2.9
通讯作者：
Nordstrom, Jessica R.
中科院分区：
文献类型：
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作者：
Dobkowski, Katie A.;Flanagan, K. Darby;Nordstrom, Jessica R.
一年生物种的动态与其每年的补充能力密切相关。我们研究了竞争和繁殖体的可用性如何影响招聘和外观和跟踪生存的一年一次的海洋大型藻类，公牛海带（Nereocystis luetkeana），这是在华盛顿州的萨利希海的主要生物栖息地。我们假设（i）幼年N. luetkeana将表现出一个季节性的外观作为一个队列在春天和（ii）竞争空间将比繁殖体（孢子）在网站附近建立N.卢特基纳层我们标记了N。luetkeana招募在现场跟踪外观和生存跨季节（春，夏，秋，冬），使用双因素交叉设计，以评估竞争和繁殖体的可用性对新N的外观的影响。luetkeana孢子体。幸存者N。luetkeana的新成员很少，虽然大多数新成员在春季出现，但每个季节都会出现一些新成员。新N.与其他季节相比，luetkeana新兵在春季实验性“播种”后也出现得最早（中位数8周对>20周）。消除大型藻类的竞争对手（“清除”）影响的外观新兵比增强繁殖在春天。对调节新氮素季节性出现的因素有了更好的理解。luetkeana孢子体进一步加深了我们对这一关键基础物种在不同季节的外观和持久性的理解，随着全球海洋条件的变化，这一点越来越重要，并突出了研究具有多个阶段和地理区域复杂生活史的生物体的重要性。
The dynamics of annual species are strongly tied to their capacity for recruitment each year. We examined how competition and propagule availability influence recruitment and appearance and tracked survivorship of an annual species of marine macroalgae, the bull kelp (Nereocystis luetkeana), which serves as major biogenic habitat in the Salish Sea of Washington State. We hypothesized that (i) juvenile N. luetkeana would exhibit a seasonal appearance as a cohort in the spring and (ii) competition for space would be more limiting than propagules (spores) to recruitment at sites adjacent to established N. luetkeana beds. We tagged N. luetkeana recruits in the field to track appearance and survivorship across seasons (spring, summer, fall, and winter), using a two-factor crossed design to assess effects of competition and propagule availability on appearance of new N. luetkeana sporophytes. Survivorship of N. luetkeana recruits was low and, whereas most new individuals arose in the spring, some appeared in every season. New N. luetkeana recruits also appeared the earliest (median 8 weeks vs. >20 weeks) after experimental "seeding" in the spring as compared to other seasons. Eliminating macroalgal competitors ("clearing") influenced the appearance of recruits more than enhancement of propagules in the spring. An improved understanding of factors regulating the seasonal appearance of new N. luetkeana sporophytes furthers our understanding of this crucial foundation species' appearance and persistence across seasons, which is increasingly important as global ocean conditions change, and highlights the importance of studying organisms with complex life histories across multiple stages and geographical regions.