Distribution of siphonophores in the Northwest Pacific Ocean and links to environmental conditions

Frontiers in Marine Science

Marine Science

Nayeon Park¹  Wonchoel Lee¹  Hyuntae Choi²  Kyung-Hoon Shin² 

[1] Department of Life Science, College of Natural Sciences, Hanyang University, Seoul, Republic of Korea;Research Institute for Natural Sciences, Hanyang University, Seoul, Republic of Korea;Department of Marine Science and Convergent Technology, Hanyang University, Ansan, Republic of Korea;

关键词: biodiversity;    gelatinous zooplankton;    indicator species;    Kuroshio Extension;    siphonophore;    stable isotope;    trophic position;   

DOI  :  10.3389/fmars.2023.1223477

 received in 2023-05-16, accepted in 2023-08-28,  发布年份 2023

来源: Frontiers

【 摘 要 】

Despite their abundance in marine ecosystems, studies on siphonophores are limited. In this study, 26 species of siphonophores in the Northwest Pacific Ocean were identified during multiple cruises of the R/V ISABU from 2018–2020, and various factors that may affect the occurrence of siphonophores, including water temperature, salinity, zooplankton biomass, and trophic niche were investigated. Statistical analysis revealed that the distribution of siphonophores and their biomass could be divided into two water mass groups, affected by the Kuroshio and Oyashio Currents. The species with high contributions to distinguishing the water mass groups (including Chelophyes contorta, Dimophyes arctica, Bassia bassensis, and Eudoxoides spiralis—mainly belonging to the Diphyidae) showed species-specific correlations with water temperature and salinity. This suggests that diphyids can be used as indicator species for currents and hydrological factors that influence water mass. The biomass of siphonophores exhibited a trend opposite to that of non-gelatinous zooplankton and showed no association with other gelatinous zooplankton. These results can be interpreted from an ecological niche perspective. Through nitrogen and carbon stable isotope analyses, the dietary sources of siphonophores could potentially overlap with those of chaetognaths or non-gelatinous zooplankton. Because the trophic position of siphonophores (2.4–3.2) also falls in the range of those of chaetognaths (2.8–3.4) and non-gelatinous zooplankton including copepods, euphausiids, and amphipods (2.4–3.5), diet competition with carnivorous mesozooplankton could be predicted. Considering that the diversity and biomass of most siphonophores are strongly positively correlated with water temperature and salinity, expansion of the Kuroshio Current is expected to lead to an increase in siphonophores in the Northwest Pacific in the future. The findings of this study are anticipated to provide novel insights into climate change prediction and response and enhance our understanding of siphonophore communities.

【 授权许可】

Unknown   
Copyright © 2023 Park, Choi, Shin and Lee