Degree of ontogenetic diet shift and trophic niche partitioning of Euphausia superba and Thysanoessa macrura are influenced by food availability
Degree of ontogenetic diet shift and trophic niche partitioning of Euphausia superba and Thysanoessa macrura are influenced by food availability
复制标题
磷虾和缨缨个体发育饮食转变和营养生态位划分的程度受食物供应量的影响
DOI：
10.1007/s00343-022-2067-4
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发表时间：
2023-04
影响因子：
1.6
通讯作者：
Guang Yang
中科院分区：
文献类型：
--
作者：
Zhipeng Pang;Xupeng Chi;Zhihui Song;Haibo Li;Yunyan Chen;Guang Yang
南极磷虾和缨环磷虾是南大洋的主要磷虾种类，据报道它们的栖息地经常重叠。对这两种磷虾的摄食策略的研究将有助于我们更好地了解它们的共存机制并估计磷虾在南大洋食物网中所扮演的角色。利用 2017/2018 年和 2018/2019 年南方夏季在阿蒙森海收集的样本中的脂肪酸和稳定同位素生物标志物，研究了不同个体发育阶段（尖尾虫、幼虫、成虫）的 E.Superba 和 T.macrura 的营养动力学。硅藻，如脆杆藻属。是2017/2018夏季浮游植物种类最多的物种，而2018/2019夏季浮游植物丰度以褐囊藻为主。 2018/2019年，随着两个物种的个体发育，肉食性指数18:1n–9/18:1n–7逐渐增加，表明与幼鱼和幼虫相比，成虫更倾向于肉食性摄食。同时，2018/2019年夏季，在幼鱼和成鱼阶段，大斑竹的δ^15N值比木竹更大。我们的结果表明，两种磷虾之间的营养生态位分化出现在幼体后期，并且可能受到食物供应的影响。与 E.Superba 相比，T.macrura 更倾向于根据食物供应情况进行杂食性或肉食性捕食。
Euphausia superba and Thysanoessa macrura are dominant krill species in the Southern Ocean and their habitats are often overlapped reportedly. Studies of the feeding strategies of these two krill species will help us better understand the coexistence mechanisms and estimate the roles that krill played in the food web of the Southern Ocean. The trophodynamics of E. superba and T. macrura at different ontogenetic stages (furcilia, juvenile, adult) were studied using fatty acid and stable isotope biomarkers in the samples collected in Amundsen Sea during austral summer of 2017/2018 and 2018/2019. Diatoms like Fragilariopsis spp. was the most abundant phytoplankton species in the summer of 2017/2018, while the abundance of phytoplankton in the summer of 2018/2019 was dominated by Phaeocystis sp. The gradual increase of the carnivorous index 18:1n–9/18:1n–7 with ontogeny of both species in 2018/2019 indicated more carnivorous feeding of adults compared with juveniles and larvae. Meanwhile, greater δ^15N values of T. macrura than that of E. superba were more significant in the juvenile and adult stages during the summer of 2018/2019. Our results indicate that the trophic niche differentiation between the two krill species appeared in postlarval stage and can be influenced by food availability. Compared with E. superba, T. macrura was more prone to feed omnivorously or carnivorously responding to food availability.
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DOI：
10.3389/fmars.2020.610248
发表时间：
2021-01
期刊：
--
影响因子：
--
作者：
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10.1016/j.dsr2.2019.104719
发表时间：
2020-04
影响因子：
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影响因子：
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DOI：
10.1016/j.dsr.2014.09.002
发表时间：
2015
期刊：
--
影响因子：
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影响因子：
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