Primary productivity impacts community structure of euphausiids in the low-latitude Indian and Pacific Oceans

IF 1.3 4区地球科学 Q4 OCEANOGRAPHY Journal of Oceanography Pub Date : 2024-02-14 DOI:10.1007/s10872-024-00713-z

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Abstract

Euphausiids are a vital component of global marine micronekton. To reveal the primary environmental factors influencing euphausiid distribution patterns in the previously overlooked low-latitude ecosystems, we investigated a large-scale community structure of euphausiids covering the North Pacific subtropical gyre (NPSG) and low-latitude eastern Indian (EI), and South Pacific Oceans (SP). A total of 41 euphausiid species from six genera were identified. Integrated primary production (PP) correlated significantly with the euphausiid abundance and species diversity and displayed the most critical influence on the variations in euphausiid community structure in low latitudes. Dissolved oxygen (DO) was the second significant environmental driver. Due to the distinct distribution patterns of euphausiid species in response to different PP and DO levels, the low-latitude euphausiid assemblages were mainly distinguished into subtropical and tropical communities. The subtropical euphausiid community associated with lower PP and higher DO demonstrated significantly lower euphausiid abundance but higher diversity than the tropical community. Euphausia brevis, E. mutica, and Stylocheiron abbreviatum, which characterize the subtropical community, appear to depend less on the phytoplanktonic prey. Euphausia diomedeae and Hansarsia gracilis, typifying the tropical population, showed stronger hypoxia tolerance. Additionally, each community was further divided into three subgroups under the influence of surface PP (subtropical: marginal NPSG, central NPSG, and austral EI-SP subgroups; tropical: the Bay of Bengal, equatorial EI, and equatorial EI-SP subgroups). These results suggested that food resource is the most important in shaping euphausiids’ community structure in an oligotrophic ecosystem with subtle hydrography gradients.

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初级生产力对低纬度印度洋和太平洋中的竹节虫群落结构的影响

摘要 Euphausiids 是全球海洋微浮游生物的重要组成部分。为了揭示以前被忽视的低纬度生态系统中影响极细小蠹分布模式的主要环境因素，我们研究了北太平洋亚热带涡旋（NPSG）、低纬度东印度洋（EI）和南太平洋（SP）的大规模极细小蠹群落结构。共鉴定出 6 个属的 41 种 euphausiid。综合初级生产力（PP）与 euphausiid 的丰度和物种多样性密切相关，对低纬度地区 euphausiid 群落结构的变化影响最大。溶解氧（DO）是第二个重要的环境驱动因素。由于低纬度地区的极鞭毛虫物种在不同的PP和溶解氧水平下有不同的分布模式，因此低纬度地区的极鞭毛虫群落主要分为亚热带群落和热带群落。与热带群落相比，与较低的PP和较高的DO相关联的亚热带极毛虫群落的极毛虫丰度明显较低，但多样性较高。Euphausia brevis、E. mutica 和 Stylocheiron abbreviatum 是亚热带群落的特征，它们对浮游植物猎物的依赖程度似乎较低。热带群落中的 Euphausia diomedeae 和 Hansarsia gracilis 则表现出较强的耐缺氧能力。此外，每个群落在表层 PP 的影响下进一步分为三个亚群（亚热带：边缘 NPSG 亚群、中部 NPSG 亚群和澳大利亚 EI-SP 亚群；热带：孟加拉湾亚群、赤道 EI 亚群和赤道 EI-SP 亚群）。这些结果表明，在一个具有微妙水文地理梯度的寡营养生态系统中，食物资源是形成竹刀鱼群落结构的最重要因素。

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来源期刊

Journal of Oceanography 地学-海洋学

CiteScore

3.50

自引率

13.00%

发文量

审稿时长

6-12 weeks

期刊介绍： The Journal of Oceanography is the official journal of the Oceanographic Society of Japan and open to all oceanographers in the world. The main aim of the journal is to promote understandings of ocean systems from various aspects including physical, chemical, biological, geological oceanography as well as paleoceanography, etc. The journal welcomes research focusing on the western North Pacific and Asian coastal waters, but the study region is not limited to the Asian Pacific. The journal publishes original articles, short contributions, reviews, and correspondence in oceanography and related fields.