浮游植物动力学和营养偏好驱动亚南极浮游生物 δ13C 和 δ15N 的季节变化趋势

IF 3.8 1区 地球科学 Q1 LIMNOLOGY
Luca Stirnimann, Thomas G. Bornman, Hans M. Verheye, Sarah E. Fawcett
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引用次数: 0

摘要

海洋浮游生物的碳氮同位素比值(δ13C 和 δ15N)记录了食物网底部的生物地球化学过程。在南大洋,这些主要来自夏季的数据被用来推断地表二氧化碳浓度和生物碳输出的潜力。然而,人们对浮游生物δ13C和δ15N的变化仍然知之甚少,南大洋缺乏季节性测量数据尤其是一个限制因素。在此,我们研究了冬季、夏季和秋季从亚寒带海洋采集的悬浮颗粒物(SPM)和浮游动物的δ13C 和 δ15N。夏季δ13CSPM和δ15NSPM较低的原因是硅藻对冬季混合过程中提供的硝酸盐有很强的依赖性。到了秋季,δ13CSPM 增加,δ15NSPM 减少,这与中夏至夏末铁的限制有利于硅藻被主要消耗回收铵的纳米浮游植物取代是一致的。到了冬季,细菌对生物量的分解超过了新生物量的产生,从而降低了δ13CSPM,提高了δ15NSPM。同时采样的浮游动物的δ13C和δ15N总体上反映了δ13CSPM和δ15NSPM的变化,只有一个秋季不匹配,表明原位SPM并不总是浮游动物的主要食物来源。我们的研究显示了营养动力学和浮游植物群落组成如何影响亚南极地区同位素基线的季节性,并强调了铁的可用性的关键作用。这项工作对基于同位素的食物网研究具有启示意义,强调了考虑 δ13CSPM 和 δ15NSPM 的季节变化以及浮游植物(即 SPM)与浮游动物生物量的不同周转时间的必要性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Seasonal trends in Subantarctic plankton δ13C and δ15N are driven by phytoplankton dynamics and nutrient preference
The carbon and nitrogen isotope ratios (δ13C and δ15N) of marine plankton record biogeochemical processes at the base of the food web. In the Southern Ocean, such data, predominantly from summer, have been used to infer surface CO2 concentrations and the potential for biological carbon export. However, variability in plankton δ13C and δ15N remains poorly understood, with the lack of seasonal measurements from the Southern Ocean emerging as a particular limitation. Here, we investigate the δ13C and δ15N of suspended particulate matter (SPM) and zooplankton collected from the Subantarctic Ocean in winter, summer, and autumn. The low summertime δ13CSPM and δ15NSPM can be explained by strong diatom reliance on nitrate supplied during winter mixing. A subsequent increase in δ13CSPM and decrease in δ15NSPM by autumn is consistent with iron limitation in mid‐ to late‐summer favoring diatom succession by nano‐phytoplankton that consume mainly recycled ammonium. By winter, bacterial decomposition of biomass outpaces new biomass production, decreasing δ13CSPM and raising δ15NSPM. The δ13C and δ15N of contemporaneously sampled zooplankton generally reflect the variability in δ13CSPM and δ15NSPM, with one autumn mismatch suggesting that in situ SPM is not always the dominant zooplankton food source. Our study shows how nutrient dynamics and phytoplankton community composition shape the seasonality of the Subantarctic's isotopic baselines, emphasizing a key role for iron availability. This work has implications for isotope‐based food web studies, highlighting the need to consider seasonal variability in δ13CSPM and δ15NSPM, as well as the different turnover times of phytoplankton (i.e., SPM) vs. zooplankton biomass.
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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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