Community composition, distribution, and contribution of microbenthos in offshore sediments from the Yellow Sea

doi:10.1016/j.csr.2011.06.008

	Community composition, distribution, and contribution of microbenthos in offshore sediments from the Yellow Sea
	Meng, Zhaocui 1,2; Xu, Kuidong1 ; Lei, Yanli1 ; Xu, KD (reprint author), Chinese Acad Sci, Inst Oceanol, Qingdao 266071, Peoples R China
	2011-09-15
发表期刊	CONTINENTAL SHELF RESEARCH
ISSN	0278-4343
卷号	31 期号:14 页码:1437-1446
文章类型	Article
摘要	We investigated the spatial distribution and composition of microbenthos in the seafloor sediments from 48 stations in the Yellow Sea using epifluorescence microscopy and quantitative protargol staining techniques. The bacterial abundance ranged from 2.4 x 10(8) to 1.9 x 10(9) cells cm(-3) in the wet sediment, about three orders of magnitude higher than that of phototrophic (PNFs, from 6.4 x 10(5) to 8.8 x 10(6) cells cm(-3)) and heterotrophic nanoflagellates (HNFs, from 5.8 x 10(4) to 5.9 x 10(6) cells cm(-3)) and four orders of magnitude higher than that of cyanobacteria (from 2.3 x 10(4) to 2.3 x 10(6) cells cm(-3)) in the upper 5 cm of sediments. The abundance of diatoms varied greatly, from 3-1.1 x 10(5) cells cm(-3) in the upper 8 cm of sediments, whereas those of heterotrophic microflagellates (HMFs, 1-182 cells cm(-3)) and ciliates (1-221 cells cm(-3)) were less varied and lower. The biomass partitioning indicates the primary importance of benthic bacteria (503 mu g C cm(-3) on average), followed by PNFs (40.7 mu g C cm(-3)), HNFs (19.3 mu g C cm(-3)), and finally by cyanobacteria (8.8 mu g C cm(-3)). Benthic diatoms (0.8 mu g C cm(-3)), ciliates (0.15 mu g C cm(-3)), and HMFs (0.03 mu g C cm(-3)) contribute relatively small fractions to the total biomass of the microbenthos. About 95% of diatoms, 77% of ciliates, and 56% of HMFs were distributed in the upper 2 cm of sediments, whereas no distinct vertical distributions were observed for bacteria, cyanobacteria, PNFs, and HNFs. The microbenthos are quantitatively important in the shallow seafloor, wherein their main components have an average abundance three orders of magnitude higher than the corresponding planktonic organisms in the same sea area. Our estimates indicate that pico-sized phytobenthos might contribute a large proportion to the primary production. Benthic ciliates and heterotrophic flagellates contribute about 90% to the estimated combined metabolic rate of micro- and meiobenthic consumers in the whole sea area, with nanoheterotrophs accounting for the majority. The data suggest the potential for the rapid primary and secondary production of microbenthos and detrital utilization in the shallow seafloor sediments of the Yellow Sea. (C) 2011 Elsevier Ltd. All rights reserved.; We investigated the spatial distribution and composition of microbenthos in the seafloor sediments from 48 stations in the Yellow Sea using epifluorescence microscopy and quantitative protargol staining techniques. The bacterial abundance ranged from 2.4 x 10(8) to 1.9 x 10(9) cells cm(-3) in the wet sediment, about three orders of magnitude higher than that of phototrophic (PNFs, from 6.4 x 10(5) to 8.8 x 10(6) cells cm(-3)) and heterotrophic nanoflagellates (HNFs, from 5.8 x 10(4) to 5.9 x 10(6) cells cm(-3)) and four orders of magnitude higher than that of cyanobacteria (from 2.3 x 10(4) to 2.3 x 10(6) cells cm(-3)) in the upper 5 cm of sediments. The abundance of diatoms varied greatly, from 3-1.1 x 10(5) cells cm(-3) in the upper 8 cm of sediments, whereas those of heterotrophic microflagellates (HMFs, 1-182 cells cm(-3)) and ciliates (1-221 cells cm(-3)) were less varied and lower. The biomass partitioning indicates the primary importance of benthic bacteria (503 mu g C cm(-3) on average), followed by PNFs (40.7 mu g C cm(-3)), HNFs (19.3 mu g C cm(-3)), and finally by cyanobacteria (8.8 mu g C cm(-3)). Benthic diatoms (0.8 mu g C cm(-3)), ciliates (0.15 mu g C cm(-3)), and HMFs (0.03 mu g C cm(-3)) contribute relatively small fractions to the total biomass of the microbenthos. About 95% of diatoms, 77% of ciliates, and 56% of HMFs were distributed in the upper 2 cm of sediments, whereas no distinct vertical distributions were observed for bacteria, cyanobacteria, PNFs, and HNFs. The microbenthos are quantitatively important in the shallow seafloor, wherein their main components have an average abundance three orders of magnitude higher than the corresponding planktonic organisms in the same sea area. Our estimates indicate that pico-sized phytobenthos might contribute a large proportion to the primary production. Benthic ciliates and heterotrophic flagellates contribute about 90% to the estimated combined metabolic rate of micro- and meiobenthic consumers in the whole sea area, with nanoheterotrophs accounting for the majority. The data suggest the potential for the rapid primary and secondary production of microbenthos and detrital utilization in the shallow seafloor sediments of the Yellow Sea. (C) 2011 Elsevier Ltd. All rights reserved.
关键词	Microbenthos Distribution Abundance Biomass Sediment Yellow Sea
学科领域	Oceanography
DOI	10.1016/j.csr.2011.06.008
URL	查看原文
收录类别	SCI
语种	英语
WOS记录号	WOS:000295438900005
引用统计	被引频次：10[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
版本	出版稿
条目标识符	http://ir.qdio.ac.cn/handle/337002/11387
专题	海洋生物分类与系统演化实验室
通讯作者	Xu, KD (reprint author), Chinese Acad Sci, Inst Oceanol, Qingdao 266071, Peoples R China
作者单位	1.Chinese Acad Sci, Inst Oceanol, Qingdao 266071, Peoples R China 2.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China
第一作者单位	中国科学院海洋研究所
推荐引用方式 GB/T 7714	Meng, Zhaocui,Xu, Kuidong,Lei, Yanli,et al. Community composition, distribution, and contribution of microbenthos in offshore sediments from the Yellow Sea[J]. CONTINENTAL SHELF RESEARCH,2011,31(14):1437-1446.
APA	Meng, Zhaocui,Xu, Kuidong,Lei, Yanli,&Xu, KD .(2011).Community composition, distribution, and contribution of microbenthos in offshore sediments from the Yellow Sea.CONTINENTAL SHELF RESEARCH,31(14),1437-1446.
MLA	Meng, Zhaocui,et al."Community composition, distribution, and contribution of microbenthos in offshore sediments from the Yellow Sea".CONTINENTAL SHELF RESEARCH 31.14(2011):1437-1446.

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