聚合定殖桡足类对高纬度峡湾生物碳泵的影响

IF 3.8 1区 地球科学 Q1 LIMNOLOGY Limnology and Oceanography Pub Date : 2024-07-29 DOI:10.1002/lno.12641
Camilla Svensen, Morten Iversen, Fredrika Norrbin, Klas Ove Möller, Ingrid Wiedmann, Jofrid Skarðhamar, Coralie Barth-Jensen, Slawomir Kwasniewski, Mateusz Ormanczyk, Anna Maria Dąbrowska, Marja Koski
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引用次数: 0

摘要

浮游动物对下沉聚集体的消耗会影响输出到深海的有机碳的质量和数量。越来越多的实验室证据表明,与小颗粒相关的桡足类通过摄食下沉颗粒影响通量衰减,但这一现象尚未在现场得到量化。我们研究了一种丰富的颗粒定殖桡足类动物--Microsetella norvegica--对亚北极峡湾垂直碳通量衰减的影响。这项研究结合了对垂直碳通量、海洋雪的丰度和大小分布以及粪便颗粒和藻类聚集体降解率的实地测量。雌性 Norvegica 在暴露于聚集物时改变了摄食行为,对海洋雪的摄食率为 0.20 μg C ind.-1 d-1,对完整磷虾粪粒的摄食率为 0.11 μg C ind.-1 d-1,相当于雌性身体碳质量的 48% 和 26%。由于海面丰度高达约 50 ind.L-1,诺维盖贻贝种群有可能承担水体上层 50 米处几乎所有的碳清除量,这取决于集合体的类型。我们的观测结果突显了丰富的小型桡足类对生物地球化学循环的潜在重要性,因为它们会影响出口通量及其在黄昏区的衰减。
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Impact of aggregate-colonizing copepods on the biological carbon pump in a high-latitude fjord

Zooplankton consumption of sinking aggregates affects the quality and quantity of organic carbon exported to the deep ocean. Increasing laboratory evidence shows that small particle-associated copepods impact the flux attenuation by feeding on sinking particles, but this has not been quantified in situ. We investigated the impact of an abundant particle-colonizing copepod, Microsetella norvegica, on the attenuation of the vertical carbon flux in a sub-Arctic fjord. This study combines field measurements of vertical carbon flux, abundance, and size-distribution of marine snow and degradation rates of fecal pellets and algal aggregates. Female M. norvegica altered their feeding behavior when exposed to aggregates, and ingestion rates were 0.20 μg C ind.−1 d−1 on marine snow and 0.11 μg C ind.−1 d−1 on intact krill fecal pellets, corresponding to 48% and 26% of the females' body carbon mass. Due to high sea surface abundance of up to ~ 50 ind. L−1, the population of M. norvegica had the potential to account for almost all the carbon removal in the upper 50 m of the water column, depending on the type of the aggregate. Our observations highlight the potential importance of abundant small-sized copepods for biogeochemical cycles through their impact on export flux and its attenuation in the twilight zone.

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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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