Meiofauna assemblages in and around the Aleutian Trench, with focus on Harpacticoida (Copepoda)

IF 3.8 3区地球科学 Q1 OCEANOGRAPHY

Progress in Oceanography Pub Date : 2025-05-25 DOI:10.1016/j.pocean.2025.103510

Frederic Bonk , Franziska Iwan , Angelika Brandt , Pedro Martínez Arbizu

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Abstract

The aim of this study was to investigate and compare the composition of meiofaunal organisms in and around the Aleutian Trench, with a detailed focus on Harpacticoida. Overall, Nematoda were the most abundant Taxon (88.5 – 86.6%) followed by Copepoda (4.8 – 3.8%). The highest concentrations of these two taxa were observed in the northern rim of the trench and the Bering Sea, while Loricifera demonstrated higher abundances in the southern rim. Furthermore, a greater number of harpacticoid families were identified in samples from the northern rim and the Bering Sea compared to the other sampling sites. A total of 16 different harpacticoid families were identified, with Ectinosomatidae being the most abundant. Samples from the Aleutian trench exhibited low diversity and the lowest number of encountered families. The distribution and composition of meiofaunal organisms were found to be influenced by water depth, silt and clay content, and TOC. For the harpacticoid families, the most influential factors were water depth and Chl-a. The families Ectinosomatidae and Pseudotachidiidae contribute the most to Bray-Curtis dissimilarities. Out of seven selected harpacticoid genera, no genera showed a significant high abundance in the Aleutian trench, while Pseudotachidius showed a higher abundance in the Bering Sea compared to the northern rim of the trench and within the trench, and Zosime showed a higher abundance in the Bering Sea and in the northern rim compared to the southern rim of the trench.

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阿留申海沟内及其周围的小型动物群，重点是桡足类的鳍足类

本研究的目的是调查和比较阿留申海沟及其周围的小动物生物的组成，并详细介绍了Harpacticoida。其中线虫类（88.5 ~ 86.6%）最多，桡足类（4.8 ~ 3.8%）次之。这两个分类群在海沟北缘和白令海的丰度最高，而Loricifera在海沟南缘的丰度较高。此外，与其他采样点相比，在北部边缘和白令海的样本中发现了更多的竖琴科。共鉴定出16个不同的羽虫科，其中以羽虫科数量最多。阿留申海沟的样品多样性低，遇到的科数最少。研究发现，小动物的分布和组成受水深、淤泥和粘土含量以及TOC的影响。对海参科影响最大的因子是水深和Chl-a。寄生科和拟寄生科对布雷-柯蒂斯差异贡献最大。所选的7个harpacticoid属中，没有一个属在阿留申海沟中表现出显著的高丰度，而pseudoachidius属在白令海的丰度高于海沟北缘和海沟内，Zosime属在白令海和海沟北缘的丰度高于海沟南缘。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Progress in Oceanography 地学-海洋学

CiteScore

7.20

自引率

4.90%

发文量

138

审稿时长

3 months

期刊介绍： Progress in Oceanography publishes the longer, more comprehensive papers that most oceanographers feel are necessary, on occasion, to do justice to their work. Contributions are generally either a review of an aspect of oceanography or a treatise on an expanding oceanographic subject. The articles cover the entire spectrum of disciplines within the science of oceanography. Occasionally volumes are devoted to collections of papers and conference proceedings of exceptional interest. Essential reading for all oceanographers.