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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潮间带岩藻类荷尔莫斯拉班克斯菌的种群统计：招募对当地丰度的重要性


形成树冠的大型藻类构成了全球多样化沿海生态系统的基础。类岩藻类的班氏藻通常是澳大利亚南部和新西兰温带潮间带的主要树冠形成大型藻类，通常与珊瑚草皮的下层植被相关。班氏激素很容易受到自然和人为干扰，尽管其数量丰富，但很少有研究考察这一重要物种的人口统计学。这项研究确定了H. Bankii对其树冠和林下珊瑚草皮的不同干扰梯度的人口反应。我们建立了一些图，其中在脉冲扰动中操纵H.bankii和/或林下珊瑚草皮的密度来模拟干扰事件。被操纵的地块包含八种处理方法，范围从 100% 去除H. Bankii到 100% 去除林下珊瑚草皮。然后，我们对招募人员进行了衡量，并对个别招募人员进行了长达 18 个月的跟踪，以确定成长和存活率。我们发现，在整个实验过程中，班克氏菌的招募量随季节变化，在夏季最高，新招募者的存活率普遍较高，并且该物种生长缓慢且寿命较长。此外，干扰水平似乎并不影响招募、生长或存活率，并且招募后死亡率与H.bankii密度无关。在这个系统中， H. Banksii似乎是一种相对长寿的多年生物种，其人口统计与密度无关，这似乎允许从干扰中恢复。