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Fucus vesiculosus populations on artificial structures have potentially reduced fecundity and are dislodged at greater rates than on natural shores
Marine Environmental Research ( IF 3.3 ) Pub Date : 2021-03-31 , DOI: 10.1016/j.marenvres.2021.105324
Veronica Farrugia Drakard , Paul Brooks , Tasman P. Crowe , Hannah S. Earp , Bryan Thompson , Nathan Bourke , Ruby George , Chloe Piper , Pippa J. Moore

Artificial structures are widespread features of coastal marine environments. These structures, however, are poor surrogates of natural rocky shores, meaning they generally support depauperate assemblages with reduced population sizes. Little is known about sub-lethal effects of such structures, for example, in terms of demographic properties and reproductive potential that may affect the dynamics and long-term viability of populations. Such understanding is particularly important for ecosystem engineer species, such as the intertidal seaweed Fucus vesiculosus. In this study, F. vesiculosus was sampled on eight artificial structures and eight natural shores along the east coast of Ireland and the west coast of Wales. Algal percentage cover, biomass, density of individuals, and growth rate did not differ between artificial and natural shores. Growth and reproductive cycles were consistent with previous studies for this species. While there was considerable variation from site to site, on average, populations on natural shores produced a higher number of mature receptacles during the peak reproductive period in April, and lower rates of dislodgement than on artificial structures. As F. vesiculosus reach peak reproductive output after 24 months, this suggests that individuals may be removed from populations on artificial structures before reaching their full reproductive potential. In this case, this did not influence density, percentage cover, or biomass, which suggests that F. vesiculosus populations on artificial structures may function similarly to those on natural shores if supported by suitable source populations, but potentially may not persist otherwise.



中文翻译:

与天然海岸相比,人工结构上的墨角藻种群繁殖力可能降低,并且流离失所的速率更高。

人造结构是沿海海洋环境的普遍特征。但是,这些结构是天然岩石海岸的替代物,这意味着它们通常支持人口减少的贫化组合。关于这种结构的亚致死作用知之甚少,例如,就可能影响人口动态和长期生存能力的人口特性和生殖潜力而言。这种理解对于生态系统工程学物种尤其重要,例如潮间带海藻(Fucus vesiculosus)。在这项研究中,F。vesiculosus在爱尔兰东海岸和威尔士西海岸的八个人造结构和八个自然海岸上进行了采样。人工和天然海岸之间的藻类百分比覆盖率,生物量,个体密度和增长率没有差异。生长和生殖周期与以前对该物种的研究一致。尽管各地之间差异很大,但平均而言,在4月的繁殖高峰期,天然海岸的种群产生了更多的成熟容器,而移出的速率低于人工结构。由于F. vesiculosus在24个月后达到峰值生殖产量,这表明个体可能会在达到其完全繁殖潜能之前从人工结构的种群中移出。在这种情况下,这不会影响密度,覆盖率或生物量,这表明,如果有合适的来源种群支持,人工结构上的维氏梭菌种群的功能可能与天然海岸上的相似,但可能不会持续存在。

更新日期:2021-04-09
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