Nematode community composition in hydrothermal vent and adjacent non-vent fields around Myojin Knoll, a seamount on the Izu-Ogasawara Arc in the western North Pacific Ocean
Nematode community composition in hydrothermal vent and adjacent non-vent fields around Myojin Knoll, a seamount on the Izu-Ogasawara Arc in the western North Pacific Ocean
复制标题
北太平洋西部伊豆-小笠原弧上的海山明神山周围热液喷口和邻近非热液喷口区域的线虫群落组成
DOI：
10.1007/s00227-014-2460-4
复制
发表时间：
2014
期刊：
影响因子：
--
通讯作者：
M.
中科院分区：
文献类型：
--
作者：
Setoguchi;Y.;Nomaki;H.;Kitahashi;T.;Watanabe;H.;Inoue;K.;Ogawa;NO;Shimanaga;M.
与热液喷口等化学合成生态系统中的特定大型底栖无脊椎动物不同，据报告，这种生境中的小型底栖动物群落与邻近“正常”环境中的小型底栖动物有很强的分类重叠。然而，小型动物直到最近才被纳入对这些环境的研究，关于这些群落的详细信息仍然很少。这在西北太平洋尤其如此，尽管该地区的火山口中有许多海山有活跃的喷口。首次对日本伊豆-小川弧海山Myojin Knoll(32°06‘N，139°52’E，深度1300 m)的热液喷口区域沉积物中线虫群落组成进行了研究，并与火山口内外相邻的非喷口区域进行了比较。多变量分析表明，破火山口周围热液区与非热液区的线虫组成存在明显差异。但在两个或全部三个喷口都发现了共性属，如Oxystomina、Pareudesmoscolex、Desmoscolex和Microlaimus，但它们的等级贡献在三个喷口之间存在差异。将Myojin Knoll的数据与不同区域(如北斐济盆地、东太平洋海隆、中大西洋海脊)其他深海喷口环境的数据进行比较，发现Myojin火山口的喷口与火山口周围非喷口的线虫组成更接近，而不是其他地区的喷口。来自西北太平洋的这些数据还表明，在热液喷口地区缺乏远程运输系统和小型动物的当地适应。
In contrast to specific large benthic invertebrates in chemosynthetic ecosystems such as hydrothermal vents, meiofaunal communities in such habitats have been reported to have strong taxonomic overlap with meiofauna in the adjacent “normal” environments. However, meiofauna have only recently been included in studies of those environments and detailed information on these communities is still rare. This is especially true in the Northwest Pacific Ocean, even though there are many seamounts with active vents in the calderas of the region. Nematode community composition at the genus level in sediments from a hydrothermal vent field in the caldera of Myojin Knoll (32°06′N, 139°52′E, depth 1,300 m), a seamount on the Izu-Ogasawara Arc, Japan, was investigated for the first time and was compared with adjacent non-vent areas inside and outside the caldera. Multivariate analyses showed that the composition of nematodes in the hydrothermal field was significantly different from that in the non-hydrothermal fields around the caldera. However, the common genera, such asOxystomina,Pareudesmoscolex,Desmoscolex, andMicrolaimuswere found in two, or all three vent fields while their rank contributions differed among the three fields. When the data from Myojin Knoll were compared with those from other deep-sea vent environments in different regions (e.g., North Fiji Basin, East Pacific Rise, Mid-Atlantic Ridge), the nematode composition in the vent field of the Myojin caldera was more similar to that of the non-vent fields around the caldera than the composition in vent fields of other regions. These data from the Northwest Pacific Ocean also suggest the absence of long-range transport systems and local adaptations for meiofauna in hydrothermal vent fields.