Degree of ontogenetic diet shift and trophic niche partitioning of <italic style="font-style: italic">Euphausia</italic> <italic style="font-style: italic">superba</italic> and <italic style="font-style: italic">Thysanoessa</italic> <italic style="font-style: italic">macrura</italic> are influenced by food availability

Zhipeng PANG; Xupeng CHI; Zhihui SONG; Haibo LI; Yunyan CHEN; Guang YANG

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Degree of ontogenetic diet shift and trophic niche partitioning of Euphausia superba and Thysanoessa macrura are influenced by food availability

Ecology | Updated：2024-10-12

- Degree of ontogenetic diet shift and trophic niche partitioning of Euphausia superba and Thysanoessa macrura are influenced by food availability
- Journal of Oceanology and Limnology Vol. 41, Issue 3, Pages: 1039-1049(2023)
- Affiliations：
  
  1.College of Environmental and Safety Engineering, Qingdao University of Science and Technology, Qingdao 266061, China
  2.Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
  3.Laboratory for Marine Ecology and Environmental Science, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266237, China
  4.Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao 266071, China
  5.Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, China
- Author bio：
  
  yangguang@qdio.ac.cn
- Funds：
- DOI：
  CLC：
- Received：13 February 2022，
  
  Published：01 May 2023
- Accepted：
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PANG Zhipeng,CHI Xupeng,SONG Zhihui,et al.Degree of ontogenetic diet shift and trophic niche partitioning of Euphausiasuperba and Thysanoessamacrura are influenced by food availability[J].Journal of Oceanology and Limnology,2023,41(03):1039-1049.
DOI：

PANG Zhipeng,CHI Xupeng,SONG Zhihui,et al.Degree of ontogenetic diet shift and trophic niche partitioning of Euphausiasuperba and Thysanoessamacrura are influenced by food availability[J].Journal of Oceanology and Limnology,2023,41(03):1039-1049. DOI：

摘要

Abstract

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

superba

and

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

N values of

macrura

than that of

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

superba

macrura

was more prone to feed omnivorously or carnivorously responding to food availability.

关键词

Keywords

references

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Degree of ontogenetic diet shift and trophic niche partitioning of Euphausia superba and Thysanoessa macrura are influenced by food availability

DOI：

摘要

Abstract

关键词

Keywords

references