峡湾冷水珊瑚礁生物量分布图揭示了垂直壁生境的独特功能作用

IF 2.3 3区 地球科学 Q2 OCEANOGRAPHY
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引用次数: 0

摘要

峡湾为大型冷水珊瑚礁(CWC)提供了独特的栖息地,这些珊瑚礁通常生长在山坡和垂直岩壁上。峡湾珊瑚礁是挪威最繁荣的冷水珊瑚礁之一。然而,对这些珊瑚礁,尤其是壁礁的研究却明显不足。在这里,我们绘制了挪威哈当厄尔峡湾内造礁珊瑚Lophelia pertusa(同义为Desmophyllum pertusum)和主要的大型CWC礁相关悬浮觅食动物(海绵Geodia barretti和Mycale lingua、CWC Madrepora oculata和双壳贝Acesta excavata)的生物量、总碳储量和碳周转(作为呼吸作用)图。遥控潜水器(ROV)记录的壁礁和礁石视频被用来估算特定物种的生物量。结合高分辨率地形数据(2 × 2 米),使用随机森林(RF)模型制作了物种生物量预测图。由此得出的生物量数据与文献中物种特有的碳含量和碳呼吸速率相结合,估算出壁礁与岩礁的碳储量和碳周转率。射频模型的特定区域结果显示,壁礁对所有物种都具有较高的栖息地适宜性,但孔雀鱼除外,因为孔雀鱼在壁礁上更占优势。因此,壁礁对所有物种的生物量、碳储量和周转率的支持都比台阶礁高出 11 倍,但孔雀鱼除外,其生物量、碳储量和周转率是台阶礁的两倍。因此,壁礁上主要悬浮取食动物(所有研究物种)的总平均碳周转率是基礁的 1.5 至 4.8 倍。底栖壁礁巨型动物的碳周转率很高,而且可能广泛分布于挪威峡湾和全球各地,因此它们在化学武器公约珊瑚礁系统中的生物量和功能作用可能很大,但却被忽视了。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Biomass mapping of fjordic cold-water coral reefs reveals distinct functional role of vertical wall habitat

Fjords provide unique habitats for large cold-water coral (CWC) reefs, typically growing on sills and vertical walls. Fjord reefs are among the most thriving CWC reefs in Norway. Yet, these reefs, especially the wall reefs, are notoriously understudied. Here, we mapped the biomass, total carbon (C) stocks and C turnover (as respiration) of the reef-building coral Lophelia pertusa (syn. Desmophyllum pertusum), and dominant, large CWC reef-associated suspension feeders (the sponges Geodia barretti and Mycale lingua, the CWC Madrepora oculata and the bivalve Acesta excavata) within the Hardangerfjord, Norway. Remotely Operated Vehicle (ROV) recorded videos from wall and sill reefs were used to estimate species-specific biomass. Coupled with high resolution terrain data (2 × 2 m), predictive maps of species biomass were produced using a random forest (RF) model. The resulting biomass data were integrated with species-specific C content and C respiration rates from literature to estimate C stocks and C turnover of wall versus sill reefs. Area-specific results from the RF models reveal that wall reefs had a higher habitat suitability for all species except L. pertusa, which was more dominant on the sills. Accordingly, the wall reefs supported an up to 11 times higher biomass, C stock, and turnover for all species, except for L. pertusa, which had two-fold higher values on the sill reef. As a result, the wall reefs showed a 1.5 to 4.8 times higher total mean C turnover by dominant suspension feeders (all studied species) compared to the sill reefs. With their high C turnover and their presumably wide distribution in Norwegian fjords and globally, benthic wall reef megafauna may have a substantial, but overlooked biomass and functional role within CWC reef systems.

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来源期刊
CiteScore
4.60
自引率
4.20%
发文量
144
审稿时长
18.3 weeks
期刊介绍: Deep-Sea Research Part I: Oceanographic Research Papers is devoted to the publication of the results of original scientific research, including theoretical work of evident oceanographic applicability; and the solution of instrumental or methodological problems with evidence of successful use. The journal is distinguished by its interdisciplinary nature and its breadth, covering the geological, physical, chemical and biological aspects of the ocean and its boundaries with the sea floor and the atmosphere. In addition to regular "Research Papers" and "Instruments and Methods" papers, briefer communications may be published as "Notes". Supplemental matter, such as extensive data tables or graphs and multimedia content, may be published as electronic appendices.
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