Trophic variability of inter- and intra-copepod species in the South Sea of Korea during summer

IF 2.1 3区 地球科学 Q2 OCEANOGRAPHY
Hyuntae Choi , Seeryang Seong , Nayeon Park , Seunghan Lee , Dokyun Kim , Wonchoel Lee , Kyung-Hoon Shin
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引用次数: 0

Abstract

Spatial variation and interspecies differences in the trophic position (TP) of copepods were investigated using nitrogen isotope ratios of amino acids. In the summer of 2021, coastal waters and the Changjiang diluted water generated clear seawater temperature and salinity fronts in the South Sea of Korea. Paracalanus parvus s. l. was a dominant species in the copepod community, and the second dominant species differed among inshore, intermediate, and offshore sites. The TP of each copepod species was estimated in two ways, considering only metazoan diets (TPGlu, based on glutamic acid and phenylalanine nitrogen isotope ratios) and both metazoan and protistan diets (TPAla, based on alanine and phenylalanine nitrogen isotope ratios). Both TPGlu and TPAla indicated trophic variability among copepod species and the contribution of protistan diets as a food source in the study area. Calanus sinicus showed a similar herbivorous TP of 2.0 in both TPGlu and TPAla, suggesting little contribution from protistan diets. Two copepod species (P. parvus s. l. and Acartia omorii) exhibited TPGlu values of approximately 2.0 but their TPAla values increased from 0.1 to 0.5, indicating mixed diets of both primary producers and protists. The other three copepods (Pseudocalanus sp., Oithona similis, and O. atlantica) showed a wide range in TPGlu (2.4–3.1) and TPAla (2.7–3.4), suggesting that protistan trophic transfers enhance TPAla (by up to 0.5) in omnivorous copepods. We found a spatial variation in the TPs of copepods among water masses by various controlling factors including surface seawater temperature, salinity, and size-fractionated Chl-a. Our findings support that the TP values could be potential indicative of interspecies variability, providing useful information on the composition of the planktonic food web.

夏季韩国南海甲壳动物物种间和物种内的营养变异性
利用氨基酸的氮同位素比值研究了桡足类营养位置(TP)的空间变化和种间差异。2021 年夏季,沿岸水域和长江稀释水在韩国南海形成了明显的海水温度和盐度锋。Paracalanus parvus s. l.是桡足类群落的优势种,第二优势种在近岸、中间和离岸地点有所不同。每种桡足类的 TP 有两种估算方法,一种是仅考虑元虫食物(TPGlu,基于谷氨酸和苯丙氨酸氮同位素比值),另一种是同时考虑元虫和原生动物食物(TPAla,基于丙氨酸和苯丙氨酸氮同位素比值)。TPGlu和TPAla都表明了研究区域内桡足类物种之间的营养变异性以及原生动物作为食物来源的贡献。鲣鱼(Calanus sinicus)在TPGlu和TPAla中的草食性TP值均为2.0,表明原生动物食物的贡献很小。两种桡足类(P. parvus s. l.和 Acartia omorii)的 TPGlu 值约为 2.0,但其 TPAla 值从 0.1 增至 0.5,表明它们既以初级生产者为食,也以原生动物为食。其他三种桡足类(Pseudocalanus sp.、Oithona similis 和 O. atlantica)的 TPGlu 值(2.4-3.1)和 TPAla 值(2.7-3.4)范围较大,表明原生动物的营养转移会提高杂食性桡足类的 TPAla 值(最高可达 0.5)。我们发现,受表层海水温度、盐度和粒度分馏 Chl-a 等各种控制因素的影响,不同水团中桡足类的 TPs 存在空间差异。我们的研究结果表明,TP 值可能是物种间变异的潜在指标,为浮游食物网的组成提供了有用的信息。
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来源期刊
Continental Shelf Research
Continental Shelf Research 地学-海洋学
CiteScore
4.30
自引率
4.30%
发文量
136
审稿时长
6.1 months
期刊介绍: Continental Shelf Research publishes articles dealing with the biological, chemical, geological and physical oceanography of the shallow marine environment, from coastal and estuarine waters out to the shelf break. The continental shelf is a critical environment within the land-ocean continuum, and many processes, functions and problems in the continental shelf are driven by terrestrial inputs transported through the rivers and estuaries to the coastal and continental shelf areas. Manuscripts that deal with these topics must make a clear link to the continental shelf. Examples of research areas include: Physical sedimentology and geomorphology Geochemistry of the coastal ocean (inorganic and organic) Marine environment and anthropogenic effects Interaction of physical dynamics with natural and manmade shoreline features Benthic, phytoplankton and zooplankton ecology Coastal water and sediment quality, and ecosystem health Benthic-pelagic coupling (physical and biogeochemical) Interactions between physical dynamics (waves, currents, mixing, etc.) and biogeochemical cycles Estuarine, coastal and shelf sea modelling and process studies.
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