Respiration rates and active carbon flux of mesopelagic fishes (Family Myctophidae) in the Scotia Sea, Southern Ocean
Respiration rates and active carbon flux of mesopelagic fishes (Family Myctophidae) in the Scotia Sea, Southern Ocean
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DOI：
10.3354/meps12861
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发表时间：
2019-02-01
影响因子：
2.5
通讯作者：
Tarling, Geraint A.
中科院分区：
文献类型：
--
作者：
Belcher, Anna;Saunders, Ryan A.;Tarling, Geraint A.
中层鱼类最近被强调为海洋生态系统的一个重要组成部分，但对其研究甚少，特别是关于它们在海洋上层食物网和海洋地球化学循环中的作用。Myctophids（Myctophidae科）是中层鱼类中生物量最占优势的类群之一，它们的大规模垂直迁移提供了将碳迅速转移到深海的手段，在那里碳可以被隔离数百年或更长时间。在这项研究中，我们开发了一个简单的回归myctophid鱼呼吸速率使用文献为基础的湿质量和栖息地温度数据。我们将此回归到收集的整个南大洋斯科蒂亚-威德尔部门的净捕捞数据，以估计生物量占主导地位的myctophid物种的呼吸速率。卡氏Electrona carlsbergi、南极Electrona anaitica和Gymnoscopelus braueri对总的Myctophid呼吸有很高的贡献（高达85%）。尽管斯科舍海南部的温度较低（-1.46至0.95摄氏度），但这里的总呼吸量与斯科舍海中部和北方的温暖沃茨一样高（达到1.1 mg C m（-2）d（-1））。垂直迁移群落的最大呼吸碳通量为0.05 ~ 0.28 mg C m（-2）d（-1），相当于Scotia-Weddell地区某些地区重力颗粒有机碳通量的47%。我们的研究提供了第一个基线估计的呼吸速率和碳通量的myctophids在南大洋。然而，需要直接测量真菌呼吸和一般中层鱼类的呼吸，以进一步限制这些估计并将这些通量纳入碳预算中。
Mesopelagic fish have recently been highlighted as an important, but poorly studied component of marine ecosystems, particularly regarding their role in the marine pelagic food webs and biogeochemical cycles. Myctophids (Family Myctophidae) are one of the most biomass-dominant groups of mesopelagic fishes, and their large vertical migrations provide means of rapid transfer of carbon to the deep ocean where it can be sequestered for centuries or more. In this study, we develop a simple regression for the respiration rate of myctophid fish using literature-based wet mass and habitat temperature data. We apply this regression to net haul data collected across the Scotia-Weddell sector of the Southern Ocean to estimate respiration rates of the biomass-dominant myctophid species. Electrona carlsbergi, Electrona antarctica, and Gymnoscopelus braueri made a high contribution (up to 85 %) to total myctophid respiration. Despite the lower temperatures of the southern Scotia Sea (-1.46 to 0.95 degrees C), total respiration here was as high (reaching 1.1 mg C m(-2) d(-1) ) as in the warmer waters of the mid and northern Scotia Sea. The maximum respiratory carbon flux of the vertically migrating community was 0.05 to 0.28 mg C m(-2) d(-1), equivalent to up to 47 % of the gravitational particulate organic carbon flux in some parts of the Scotia-Weddell region. Our study provides the first baseline estimates of respiration rates and carbon flux of myctophids in the Southern Ocean. However, direct measurements of myctophid respiration, and of mesopelagic fish generally, are needed to constrain these estimates further and incorporate these fluxes into carbon budgets.