Metabolism of a subtidal rocky mussel reef in a high-temperate setting: pathways of organic C flow
Metabolism of a subtidal rocky mussel reef in a high-temperate setting: pathways of organic C flow
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DOI：
10.3354/meps13372
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发表时间：
2020-07-09
影响因子：
2.5
通讯作者：
Glud, Ronnie N.
中科院分区：
文献类型：
--
作者：
Attard, Karl M.;Rodil, Ivan F.;Glud, Ronnie N.
贻贝在岩石基质上形成丰富的，物种丰富的珊瑚礁，但这一关键栖息地在碳（C）循环中的作用仍然知之甚少。我们进行了一个5米深的光贻贝trossulus礁在波罗的海中部的季节性研究，调查有机碳流的途径和速率。珊瑚礁的总初级生产力（GPP）和呼吸（R）的季节性估计使用水下O-2涡动协方差小时和每日的时间尺度。摄影测量和生物采样被用来量化珊瑚礁粗糙度和贻贝覆盖率，并推导贻贝过滤和生物沉积。贻贝非常丰富，达到50 000 ind. m（-2）左右，珊瑚礁结构使海底表面积增加了44%。GPP（每小时）高达20 mmol O-2 m（-2）h（-1），GPP（每日）高达10（7）mmol O-2 m（-2）d（-1），与附近的海草树冠相当。每小时的涡流通量线性响应的光照强度和流速，较高的速度提高珊瑚礁O-2吸收在夜间。在13个测量日中，有12个日的珊瑚礁R-日超过GPP（日），R-年（29 mol O-2 m（-2）yr（-1））是GPP（年）的3倍。该礁维持了一个生产力的微生物和动物群落，其活动占了类似的R-年的50%。水平水平流促进食物供应的珊瑚礁，并可能促进大量的贻贝生物沉积物的横向C出口。我们的分析表明，由于持续的环境变化，贻贝礁范围的减少将有重大影响的运输和转化的C和营养物质在波罗的海沿海。
Mytilid mussels form abundant, species-rich reefs on rocky substrates, but the role of this key habitat in carbon (C) cycling remains poorly understood. We performed a seasonal study on a 5 m deep photic Mytilus trossulus reef in the Central Baltic Sea to investigate pathways and rates of organic C flow. Reef gross primary production (GPP) and respiration (R) were estimated seasonally using underwater O-2 eddy covariance on hourly and daily timescales. Photogrammetry and biotic sampling were used to quantify reef rugosity and mussel coverage, and to derive mussel filtration and biodeposition. Mussels were highly abundant, reaching similar to 50 000 ind. m(-2), and the reef structure increased the seabed surface area by 44%. GPP(hourly) was up to 20 mmol O-2 m(-2) h(-1) and GPP(daily) was up to 10(7) mmol O-2 m(-2) d(-1), comparable to a nearby seagrass canopy. Hourly eddy fluxes responded linearly to light intensity and flow velocity, with higher velocities enhancing reef O-2 uptake at night. Reef R-daily exceeded GPP(daily) on 12 of 13 measurement days, and R-annual (29 mol O-2 m(-2) yr(-1)) was 3-fold larger than GPP(annual). The reef sustained a productive community of microbes and fauna whose activities accounted for similar to 50% of R-annual. Horizontal water advection promoted food supply to the reef and likely facilitated substantial lateral C export of mussel biodeposits. Our analyses suggest that a reduction in mussel reef extent due to ongoing environmental change will have major implications for the transport and transformation of C and nutrients within the coastal Baltic Sea.