Canopy‐forming macroalgae form the basis of diverse coastal ecosystems globally. The fucoid Hormosira banksii is often the dominant canopy‐forming macroalga in the temperate intertidal of southern Australia and New Zealand, where it is commonly associated with an understory of coralline turf. Hormosira banksii is susceptible to both natural and anthropogenic disturbance and despite its abundance, few studies have examined the demography of this important species. This study determined the demographic response of H. banksii to different gradients of disturbance to both its canopy and to the understory coralline turf. We established plots in which the density of H. banksii and/or understory coralline turf was manipulated in a pulse perturbation to simulate a disturbance event. The manipulated plots contained eight treatments ranging from 100% removal of H. banksii to 100% removal of the understory coralline turf. We then measured recruitment and followed individual recruits for up to 18 months to determine growth and survivorship. We found that H. banksii recruitment was seasonally variable throughout the experiment and highest over summer, survivorship of recruits was generally high, and the species was slow‐growing and long‐lived. Moreover, the level of disturbance did not seem to affect recruitment, growth, or survivorship and post‐recruitment mortality was independent of H. banksii density. In this system, it appears that H. banksii is a relatively long‐lived perennial species whose demography is density‐independent which appears to allow recovery from disturbance.

中文翻译：

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潮间褐藻类Hormosira bankii的人口统计学：招聘对当地丰富度的重要性

形成冠层的大型藻类构成全球多样化的沿海生态系统的基础。在澳大利亚南部和新西兰的温带潮间带中，岩藻Hormosira bankii通常是占优势的树冠形成大型藻类，那里通常与珊瑚草皮下层相关。Hormosira bankii易受自然和人为干扰，尽管数量众多，但很少有研究检查该重要物种的人口统计资料。这项研究确定了H. bankii对树冠层和林下珊瑚礁草皮的不同扰动梯度的人口响应。我们建立了一些样条，其中H. bankii的密度和/或林下珊瑚礁草皮以脉冲扰动方式进行操作，以模拟干扰事件。操纵的地块包含八种处理方法，从100％去除H.bankii到100％去除林下珊瑚线草皮。然后，我们测量了招募人数，并跟踪了长达18个月的个人招募人员，以确定其成长和生存能力。我们发现，在整个实验过程中，H。bankii的募集在季节上是变化的，并且在夏季最高，新兵的存活率通常很高，并且该物种生长缓慢且寿命长。此外，干扰水平似乎并未影响招募，生长或生存，并且招募后的死亡率与银行H.ii密度无关。在这个系统中，H. bankii是一种相对长寿的多年生物种，其人口统计学与密度无关，似乎可以从干扰中恢复。