Cathie A. Page, Christine Giuliano, Carly J. Randall
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Crustose coralline algae (CCA) cover on seeding units prior to deployment was a significant driver of short‐ and long‐term spat survival (22% of variation). Survival of <jats:italic>Acropora millepora</jats:italic> and <jats:italic>A. muricata</jats:italic> spat did not differ according to benthic community variation. Increasing cover of branching <jats:italic>Acropora</jats:italic> corals was correlated with decreased survival and the size of <jats:italic>Montipora aequituberculata</jats:italic> spat, although CCA cover on plugs remained the most influential factor determining survival. Interspecific variation in spat survival and size and higher survival and size in the side‐facing orientation of the seeding units suggest natural variation in response to the seeding method, warranting further experiments to refine species selection and deployment methods prior to upscaling. 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引用次数: 0
摘要
在工程基质上播种新定居的珊瑚是一种正在开发的技术,旨在增加珊瑚礁上幼年珊瑚的数量,从而提高珊瑚礁对气候变暖的适应能力。利用分层取样设计,我们探索了原位播种珊瑚(孢子)存活和生长变化的空间尺度,并研究了南部近海大堡礁播种孢子成功的环境驱动因素。10 个月后,在最小的空间尺度(1-2 米)上,幼体存活率和大小的变化最大(分别占变化的 27% 和 11%),这表明定居后存活和生长的主要驱动因素发生在这一尺度上。投放前播种单元上的壳状珊瑚藻(CCA)覆盖率是短期和长期孢子存活率的重要驱动因素(占变异的 22%)。Acropora millepora 和 A. muricata 的存活率并不因底栖群落的变化而不同。分枝状 Acropora 珊瑚覆盖率的增加与 Montipora aequituberculata 藻体存活率和大小的减小有关,尽管插条上的 CCA 覆盖率仍然是决定存活率的最有影响力的因素。种间珊瑚存活率和大小的差异以及播种单元朝向侧面的存活率和大小较高,表明播种方法存在自然差异,因此在扩大规模之前,有必要进行进一步的实验,以完善物种选择和部署方法。播种孢子存活率和大小在地点内的高度差异突出表明,今后需要在精细的空间尺度上对造成定居后死亡的生态因素进行研究。
Benthic communities influence coral seeding success at fine spatial scales
The deployment of engineered substrates seeded with newly settled corals is a technique being developed to increase the numbers of juvenile corals on reefs with the goal of improving reef resilience in response to climate warming. Using a hierarchical sampling design, we explored the spatial scales at which seeded coral (spat) survival and growth varied in situ and investigated the environmental drivers of seeded spat success in the southern inshore Great Barrier Reef. After 10 months, variation in spat survival and size was greatest at the smallest spatial scale (1–2 m) (27 and 11% of variation, respectively), indicating the scale at which the main drivers of post‐settlement survival and growth are occurring. Crustose coralline algae (CCA) cover on seeding units prior to deployment was a significant driver of short‐ and long‐term spat survival (22% of variation). Survival of Acropora millepora and A. muricata spat did not differ according to benthic community variation. Increasing cover of branching Acropora corals was correlated with decreased survival and the size of Montipora aequituberculata spat, although CCA cover on plugs remained the most influential factor determining survival. Interspecific variation in spat survival and size and higher survival and size in the side‐facing orientation of the seeding units suggest natural variation in response to the seeding method, warranting further experiments to refine species selection and deployment methods prior to upscaling. High within‐site variation in seeded spat survival and size highlights the need for future studies of ecological factors driving post‐settlement mortality at fine spatial scales.
期刊介绍:
Restoration Ecology fosters the exchange of ideas among the many disciplines involved with ecological restoration. Addressing global concerns and communicating them to the international research community and restoration practitioners, the journal is at the forefront of a vital new direction in science, ecology, and policy. Original papers describe experimental, observational, and theoretical studies on terrestrial, marine, and freshwater systems, and are considered without taxonomic bias. Contributions span the natural sciences, including ecological and biological aspects, as well as the restoration of soil, air and water when set in an ecological context; and the social sciences, including cultural, philosophical, political, educational, economic and historical aspects. Edited by a distinguished panel, the journal continues to be a major conduit for researchers to publish their findings in the fight to not only halt ecological damage, but also to ultimately reverse it.