| ZHANG Ye,LI Chaolun,YANG Guang,WANG Yanqing,TAO Zhencheng,ZHANG Yongshan,WANG Aijun.Ontogenetic diet shift in Antarctic krill (Euphausia superba) in the Prydz Bay: a stable isotope analysis[J].Acta Oceanologica Sinica,2017,36(12):67-78 |
| 基于稳定性同位素的普里兹湾南极大磷虾不同发育阶段食性转变分析 |
| Ontogenetic diet shift in Antarctic krill (Euphausia superba) in the Prydz Bay: a stable isotope analysis |
| 投稿时间：2016-01-20 |
| DOI：10.1007/s13131-017-1049-4 |
| 中文关键词: 南极大磷虾 普里兹湾 食性转变 稳定性同位素 Isosource |
| 英文关键词:Antarctic krill Prydz Bay diet shift stable isotope IsoSource |
| 基金项目:Chinese Polar Environment Comprehensive Investigation & Assessment Programmes under contract No. CHINARE2016-01-05; the Scientific and Technological Innovation Project financially supported by Qingdao National Laboratory for Marine Science and Technology under contract No. 2015ASKJ01; the National Natural Science Foundation of China under contract No. 41206180. |
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| 中文摘要: |
| 作为南大洋最常见和优势的生物物种，南极大磷虾（Euphausia superba）在食物网结构和能量流动过程中扮演着重要的角色。本文研究了2012/2013年夏季普里兹湾南极大磷虾的摄食，并用稳定性同位素方法分析了其食性的转变。大磷虾成体的氮稳定性同位素值（（2.78±0.58）‰）高于未成体（（1.69±0.70）‰），而成体的碳稳定性同位素值（-（28.26±1.08）‰）则稍稍低于未成体的值（-（27.48±1.35）‰）。用0m、25m、50m水深的颗粒有机物（POM）合起来代表大磷虾的植物性饵料。植物性饵料和中型浮游动物是南极大磷虾在普里兹湾的夏季最重要的食物来源。POM（0/25/50 m）对未成体和成体大磷虾的饵料贡献分别为56%-69%和26%-34%。而中型浮游动物占据未成体和成体大磷虾的饵料比例则分别为13%-34%和58%-71%。这些结果表示，随着大磷虾的生长，其饵料由以较低营养级浮游植物为主的POM向以中型浮游动物为主的高营养级类群转变。这种“饵料组成随生长发育发生转换”的营养策略有利于降低南极大磷虾未成体与成体之间的饵料竞争，帮助他们更好地适应南大洋海洋生态系统。 |
| 英文摘要: |
| As one of the most common and dominant species in the Southern Ocean, Antarctic krill (Euphausia superba) play a significant role in food web structure and the process of energy flow. The diet of Antarctic krill in the Prydz Bay during austral summer of 2012/2013 was investigated and the ontogenetic shift in krill diet was evaluated using the stable isotope method. The nitrogen stable isotope values (δ15N) of adults ((2.78±0.58)‰) were much higher than those of juveniles ((1.69±0.70)‰), whereas the carbon stable isotope values (δ13C) of adults (-(28.26±1.08)‰) were slightly lower than those of juveniles (-(27.48±1.35)‰). Particulate organic matter (POM) from 0, 25, and 50 m depth combined (0/25/50 m) represented phytoplankton food items. The results showed that phytoplankton food items in surface water and mesozooplankton were two essential food items for Antarctic krill in the Prydz Bay during summer. POM (0/25/50 m) contributes 56%-69% and 26%-34% to the diet of juvenile and adult krill, respectively, whereas mesozooplankton composes 13%-34% and 58%-71% of the diet of juvenile and adult krill, respectively. Thus, an ontogenetic diet shift from POM (0/25/50 m), which consists mainly of phytoplankton, to a higher trophic level diet containing mesozooplankton, was detected. The capacity for adults to consume more zooplankton food items may minimize their food competition with juveniles, which rely mostly on phytoplankton food items. This suggests “diet shift with ontogeny” which may somehow help krill keep their dietary energy budget balanced and well adapted to the Antarctic marine ecosystem as a dominant species. |
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