Temporal dietary shift in jellyfish revealed by stable isotope analysis

Temporal dietary shift in jellyfish revealed by stable isotope analysis
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稳定同位素分析揭示水母饮食的暂时转变

DOI:
10.1007/s00227-016-2892-0
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发表时间:
2016
期刊:
影响因子:
2.4
通讯作者:
Jan Dierking
Jan Dierking
中科院分区:
生物学2区
文献类型:
--
作者:
Jamileh Javidpour;Ashlie N Cipriano;A Mittermayr;Jan Dierking

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2011年6 - 10月,通过对西波罗的海基尔峡湾海蜇(Aurelia aurita)和水母(Cyanea capillata)钟状组织中δ 13 C、δ 15 N和δ 34 S的分析,研究了海蜇钟状组织中稳定同位素组成的时间变化。A的所有SI值的强烈和显著的时间变化。δ 13 C增加~3 ‰,δ 15 N减少~4 ‰,δ 34 S急剧减少~7 ‰。虽然水母同位素生态学的知识差距,特别是缺乏可靠的营养富集因子,要求保守的解释我们的数据,观察到的变化,特别是在δ 34 S,通过MixSIR混合模型表示,将与时间饮食转变A。从中型浮游动物(>150微米)到微型浮游生物和来自底栖生物的小的再悬浮颗粒(0.8-20微米)。一种迄今未被纳入模型的未知食物来源的存在也可能导致这种转变。在C. capillata,其同位素组成保持稳定,并与一个主要的mesozoooacetonitic饮食一致。混合模式输出主要由δ 34 S值驱动,表明A.在C. capillatathan先前报道,因此,一个潜在的不太重要的intraguild捕食之间的水母在基尔峡湾。总体而言,我们的研究结果清楚地强调了潜在的大量种内同位素季节性变化的水母,这应该考虑到在未来的喂养生态学研究这一组。
A temporal change in the stable isotope (SI) composition of jellyfish in the Kiel Fjord, Western Baltic Sea, was documented by analyzing δ13C, δ15N and δ34S of bell tissue ofAurelia auritaandCyanea capillatain the period between June and October 2011. A strong and significant temporal change in all SI values ofA. auritawas found, including an increase of ~3 ‰ in δ13C, a decrease of ~4 ‰ in δ15N and sharp decline of ~7 ‰ in δ34S. While knowledge gaps in jellyfish isotope ecology, in particular the lack of reliable trophic enrichment factors, call for a conservative interpretation of our data, observed changes in particular in δ34S, as indicated by means of a MixSIR mixing model, would be consistent with a temporal dietary shift inA. auritafrom mesozooplankton (>150 µm) to microplankton and small re-suspended particles (0.8–20 µm) from the benthos. Presence of a hitherto unidentified food source not included in the model could also contribute to the shift. During the 2-month occurrence ofC. capillata, its isotope composition remained stable and was consistent with a mainly mesozooplanktonic diet. Mixing model output, mainly driven by δ34S values, indicated a lower proportion ofA. auritain the diet ofC. capillatathan previously reported, and thus to a potentially lesser importance of intraguild predation among jellyfish in the Kiel Fjord. Overall, our results clearly highlighted the potential for substantial intraspecific isotopic seasonal variation in jellyfish, which should be taken into account in future feeding ecology studies on this group.
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