Simple harpacticoid composition observed at deep hydrothermal vent sites on sea knoll calderas in the North-west Pacific
Simple harpacticoid composition observed at deep hydrothermal vent sites on sea knoll calderas in the North-west Pacific
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在西北太平洋海丘破火山口的深部热液喷口处观察到的简单类锥体成分
DOI：
10.1017/s0025315421000874
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发表时间：
2021
影响因子：
1.2
通讯作者：
Iseda Koki
中科院分区：
文献类型：
--
作者：
Nakasugi Futa;Shimanaga Motohiro;Nomaki Hidetaka;Watanabe Hiromi Kayama;Kitahashi Tomo;Motomura Yusuke;Iseda Koki
Dirivultid桡足类（管口目）是在深海热液喷口发现的最成功的小型底栖生物之一，是这些生境中小型底栖生物以往大多数生态研究的重点。然而，对于典型深海海底的主要底栖桡足类-Harpacticoida-的生态，人们对群落结构的变化和喷口处的控制因素了解得不多。研究了北太平洋西部三个相邻海丘（Bayonnaise Knoll、Myojin Knoll和Myojin-sho Caldera）破火山口热液喷口烟囱结构中底栖类Harpacticoid组成的空间异质性及其与环境参数的关系。虽然以前的研究报告的dirivultids的分布与空间差异的有机质的稳定碳同位素特征（δ 13 C）在现场活动的烟囱碎屑中的强烈相关，多变量分析检测参数和harpacticoid组成在这项研究中没有显着的相关性。相反，高协会的harpacticoid组合物与水深和总有机碳（TOC）浓度的差异进行了检测。Ectinosomatidae占主导地位，在较低的TOC值在最浅的Bayonnaise Knoll的喷口处，而他们不太普遍，在更深的喷口领域在其他小圆丘，Miraciidae是最丰富的家庭。这项研究表明，喷口化能自养碳的可用性不是控制hapacticoids的组成的主要因素，即使在热液喷口的栖息地，而是由食物量，无论其资源（包括海洋雪从海面），在研究区。
Dirivultid copepods (Siphonostomatoida), one of the most successful meiobenthic organisms found at deep-sea hydrothermal vents, have been the focus of most previous ecological studies among meiofauna in these habitats. The ecology of Harpacticoida, a major benthic copepod group in typical deep-sea floor, however, is not well understood in terms of variations in community structure and controlling factors at venting sites. The spatial heterogeneities in benthic harpacticoid composition and their association with environmental parameters were investigated at hydrothermal vent chimney structures in the calderas of three neighbouring sea knolls (Bayonnaise Knoll, Myojin Knoll and Myojin-sho Caldera) in the western North Pacific. While a previous study had reported the distribution of dirivultids was strongly associated with spatial differences in stable carbon isotopic signatures (δ13C) of organic matter in the detritus on active chimneys in the field, multivariate analyses detected no significant corelation between the parameter and harpacticoid composition in this study. Instead, high associations of the harpacticoid composition with differences in water depth and total organic carbon (TOC) concentration were detected. Ectinosomatidae dominated at vent sites with lower TOC values in the shallowest Bayonnaise Knoll, while they were less prevalent at deeper vent fields in the other knolls, where Miraciidae was the most abundant family. This study indicated the availability of vent chemoautotrophic carbon is not a primary factor controlling the composition of harpacticoids even in the habitats on the hydrothermal vents, but instead by the food amount, regardless of its resources (including marine snow from the sea surface), in the study area.