Quantifying bivalve phytoplankton depletion in a eutrophic system: an integrated approach

IF 3.8 1区 地球科学 Q1 LIMNOLOGY Limnology and Oceanography Pub Date : 2024-09-19 DOI:10.1002/lno.12680
Daniel Taylor, Hans Jakobsen, Maren Moltke Lyngsgaard, Miroslaw Darecki, Mortimer Werther, Marie Maar, Camille Saurel
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Abstract

The removal of organic particulate matter, predominantly phytoplankton, in eutrophic coastal seas and estuaries is considered an ecosystem service performed by large bivalve assemblages. Mussel farming has been proposed as a measure to mitigate eutrophication, as filtration directly reduces the concentration of chlorophyll a (Chl a), a primary ecological indicator. Seston depletion is typically assessed by in situ investigation, which generally lacks spatiotemporal coverage of features relative to greater ecosystem dynamics. To assess the scale and structure of this service, the present study couples multiple measurement approaches, including moored stations, synoptic transect surveys, flow cytometry, a preliminary drone survey technique, and satellite remote sensing within and around a large mussel farm. Significant depletion patterns were observed with all methods, and mixing gradients could be detected hundreds of meters beyond the farm, with repeatable patterns but distinct findings between methods. The intensity of the depletion signal was correlated with mussel biomass loads, ambient conditions, and hydrodynamic regimes, ranging from 5% to 91% relative Chl a depletion and Secchi depth increases of up to 2 m. Changes in particle size distributions were impacted in all downstream areas, as well as phytoplankton diversity. Observed depletion gradients with satellite imagery were consistent with other measurements and can be used to complement in situ field measurements. The findings of this study, will inform carrying capacity assessments, farm configuration, and development of impact assessment programs on seston removal for bivalve aquaculture.

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富营养化系统中双壳浮游植物耗竭的量化:一种综合方法
在富营养化的沿岸海域和河口,大型双壳类群落可清除有机颗粒物质(主要是浮游植物),这被认为是一种生态系统服务。有人建议将贻贝养殖作为一种缓解富营养化的措施,因为贻贝的过滤作用可直接降低作为主要生态指标的叶绿素 a(Chl a)的浓度。淤泥消耗通常通过现场调查进行评估,而现场调查通常缺乏与更大生态系统动态相关的时空特征覆盖。为了评估这种服务的规模和结构,本研究结合了多种测量方法,包括大型贻贝养殖场内和周围的系泊站、同步横断面调查、流式细胞仪、初步的无人机调查技术和卫星遥感。所有方法都能观察到显著的耗竭模式,在养殖场数百米之外也能检测到混合梯度,模式可重复,但不同方法的结果截然不同。耗损信号的强度与贻贝生物量负荷、环境条件和水动力机制相关,相对 Chl a 耗损从 5%到 91%不等,Secchi 深度增加达 2 米。卫星图像观测到的耗损梯度与其他测量结果一致,可用于补充现场测量结果。这项研究的结果将为双壳贝类水产养殖的承载能力评估、养殖场配置和淤泥去除影响评估项目的开发提供参考。
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来源期刊
Limnology and Oceanography
Limnology and Oceanography 地学-海洋学
CiteScore
8.80
自引率
6.70%
发文量
254
审稿时长
3 months
期刊介绍: Limnology and Oceanography (L&O; print ISSN 0024-3590, online ISSN 1939-5590) publishes original articles, including scholarly reviews, about all aspects of limnology and oceanography. The journal''s unifying theme is the understanding of aquatic systems. Submissions are judged on the originality of their data, interpretations, and ideas, and on the degree to which they can be generalized beyond the particular aquatic system examined. Laboratory and modeling studies must demonstrate relevance to field environments; typically this means that they are bolstered by substantial "real-world" data. Few purely theoretical or purely empirical papers are accepted for review.
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