A multi-trophic marker approach reveals high feeding plasticity in Barents Sea under-ice fauna
A multi-trophic marker approach reveals high feeding plasticity in Barents Sea under-ice fauna
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多营养标记方法揭示了巴伦支海冰下动物群的高摄食可塑性
DOI：
10.1016/j.pocean.2022.102895
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发表时间：
2022
影响因子：
4.1
通讯作者：
Kohlbach D
中科院分区：
文献类型：
--
作者：
Kohlbach D
生长在北冰洋海冰内部和附着在海冰底部的微藻(渐变藻类)可以作为生活在海-冰-水界面(冰下动物)的动物的营养食物来源，特别是在春季底冰-藻类水华期间。因此，冰下动物可能受到海冰减少和冰藻初级生产量变化的影响。为了研究这一点，对2021年5月在巴伦支海北部生产力有显著差异的两个地点的脊状海冰下采集的浮游生物(=PPOM)和与冰有关的颗粒有机质(=IPOM)和与冰有关的两足动物--冰川双足类和极地鳕鱼(Boreogadus Saida)--的营养标志含量进行了评估。具体地说，我们调查了硅藻和甲藻产生的脂肪酸(FAs)、中上层和渐近性高度分枝异戊二烯(HBI)脂以及甾醇的组成，以确定动物在春季的饮食偏好和与海冰栖息地的营养联系。PPOM和IPOM中FAs的相对比例差异很大，分别表明中上层生境和渐近生境之间物种组成和退化状态的差异。消费者的FA特征和甾醇含量很大程度上类似于已知的饮食结构，强烈依赖硅藻来源的碳。冰川，是一种程度较高的肉食性食草动物。在极地鳕鱼中摄食水蚤的霍利姆和证据。在生产者和消费者中，要么检测到低浓度的同源HBI，要么根本没有检测到，这可能是因为其来源硅藻的丰度非常低。显著的营养标记变异性。在生产力高的陆架坡站与生产力较低的北极盆地中部站收集的冰川表明，碳源组成的灵活性高得惊人，在可获得的情况下对远洋食物的依赖程度更高，而在远洋产量较低时，冰藻碳的重要性更高。然而，尽管在我们的数据集中普遍缺乏(低于检测下限)出现的HBI，但与其他季节相比，IPOM中较高的冰藻生物量和多不饱和脂肪酸的比例表明，冰藻是春季替代中上层碳的一种有价值的营养碳源。
Microalgae growing within and attached to the bottom of Arctic sea ice (sympagic algae) can serve as a nutritious food resource for animals inhabiting the sea-ice water interface (under-ice fauna), particularly during the bottom ice-algal bloom in spring. As a consequence, under-ice fauna is likely impacted by sea-ice decline and changes in ice-algal primary production. To investigate this, samples of pelagic (=PPOM) and ice-associated particulate organic matter (=IPOM) and the ice-associated amphipodsApherusa glacialisandEusirus holmii, and polar cod (Boreogadus saida), collected below ridged sea ice at two locations with pronounced differences in productivity in the northern Barents Sea during May 2021, were assessed for their trophic marker content. Specifically, we investigated the composition of diatom- and dinoflagellate-produced fatty acids (FAs), pelagic and sympagic highly branched isoprenoid (HBI) lipids as well as sterols to determine the animals’ dietary preferences and trophic association to the sea-ice habitat during spring. Relative proportions of FAs differed strongly between PPOM and IPOM, indicating differences in species composition and degradation state between pelagic and sympagic habitats, respectively. FA signatures and sterol content of the consumers largely resembled known diet compositions with a strong reliance on diatom-derived carbon inA. glacialis, a higher degree of carnivory inE. holmiiand evidence ofCalanus-feeding in polar cod. Sympagic HBIs were detected at either low concentrations or not at all, in both producers and consumers, likely as a result of the very low abundance of their source diatoms. Pronounced trophic marker variability inA. glacialiscollected at the highly productive shelf slope station versus the less productive central Arctic Basin station suggests a surprisingly high flexibility in carbon-source composition with a stronger reliance on pelagic food when available versus a higher importance of ice algal carbon when pelagic production is low. Nevertheless and despite the general lack (below detection limit) of sympagic HBIs in our dataset, high ice-algal biomass and elevated proportions of polyunsaturated FAs in IPOM compared to other seasons indicate that ice algae constitute a valuable nutritional carbon source as alternative to pelagic carbon during spring.
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DOI：
10.3389/fmars.2020.610248
发表时间：
2021-01
期刊：
--
影响因子：
--
作者：
D. Kohlbach;H. Hop;A. Wold;K. Schmidt;L. Smik;S. Belt;Amalia Keck Al-Habahbeh;M. Woll;M. Graeve;A. Dabrowska;A. Tatarek;A. Atkinson;P. Assmy
通讯作者：
D. Kohlbach;H. Hop;A. Wold;K. Schmidt;L. Smik;S. Belt;Amalia Keck Al-Habahbeh;M. Woll;M. Graeve;A. Dabrowska;A. Tatarek;A. Atkinson;P. Assmy
影响因子：
3
作者：
Belt, Simon T.;Brown, Thomas A.;Mundy, C. J.
通讯作者：
Mundy, C. J.
加拿大北极地区巴芬湾春季深海底栖大型动物对冰源有机物的依赖通过多个营养标记突出
DOI：
--
发表时间：
2020
期刊：
Elementa: Science of the Anthropocene
影响因子：
--
作者：
G. Yunda;T. Brown;L. Michel;B. Saint;Rémi Amiraux;C. Nozais;P. Archambault
通讯作者：
P. Archambault
影响因子：
1.3
作者：
Lörz AN;Tandberg AHS;Willassen E;Driskell A
通讯作者：
Driskell A
漂浮的北极海冰藻类和南极 1 海冰硅藻中甾醇的鉴定
影响因子：
3.3
作者：
S. Belt;T. Brown;L. Smik;P. Assmy
通讯作者：
P. Assmy