Genetic assessment of meiobenthic community composition and spatial distribution in coastal sediments along northern Gulf of Mexico
Genetic assessment of meiobenthic community composition and spatial distribution in coastal sediments along northern Gulf of Mexico
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DOI：
10.1016/j.marenvres.2016.05.011
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发表时间：
2016-08-01
影响因子：
3.3
通讯作者：
Halanych, Kenneth M.
中科院分区：
文献类型：
--
作者：
Brannock, Pamela M.;Wang, Lei;Halanych, Kenneth M.
小型底栖生物（小型底栖生物和微型真核生物）通过其在营养物运输、沉积物稳定性和食物网相互作用中的作用，对水生环境中的生态系统功能做出重要贡献。尽管它们在生态上的重要性，有关这些社区在不同的空间和时间尺度上的变化的信息并不广为人知。墨西哥湾（GOM）的许多研究都集中在深海或大陆架地区，而很少关注海湾和沿海地区。在这里，我们采取了一个整体的方法，通过使用高通量测序方法来研究空间变化的小型底栖生物群落内亚拉巴马海湾和沿海北方GOM地区。沉积物样品收集沿着三个横断面（密西西比声音：MS，FOCAL：FT，和橘子海滩：OB）从2010年9月至2012年4月和社区组成确定的元巴编码的V9高变区的核18 S rRNA基因。结果表明，硅藻、环节动物、节肢动物和线虫是样品中的主要类群，而其他门在整个数据集中也存在。地点发挥了更大的作用比时间采样的社区组成。然而，样本是在很短的时间范围内收集的。样本聚类参照样带，与最东部样带（OB）有一个独特的社区组成相比，其他两个样带（MS和FT）。社区在区域方面也有差异（海湾与大陆架）。体积密度和无机碳百分比是唯一测得的环境因素，与社会组成。(C)2016爱思唯尔有限公司版权所有
Meiobenthic (meiofauna and micro-eukaryotes) organisms are important contributors to ecosystem functioning in aquatic environments through their roles in nutrient transport, sediment stability, and food web interactions. Despite their ecological importance, information pertaining to variation of these communities at various spatial and temporal scales is not widely known. Many studies in the Gulf of Mexico (GOM) have focused either on deep sea or continental shelf areas, while little attention has been paid to bays and coastal regions. Herein, we take a holistic approach by using high-throughput sequencing approaches to examine spatial variation in meiobenthic communities within Alabama bays and the coastal northern GOM region. Sediment samples were collected along three transects (Mississippi Sound: MS, FOCAL: FT, and Orange Beach: OB) from September 2010 to April 2012 and community composition was determined by metabarcoding the V9 hypervariable region of the nuclear18S rRNA gene. Results showed that Stramenopiles (diatoms), annelids, arthropods (copepods), and nematodes were the dominate groups within samples, while there was presence of other phyla throughout the dataset. Location played a larger role than time sampled in community composition. However, samples were collected over a short temporal scale. Samples clustered in reference to transect, with the most eastern transect (OB) having a distinct community composition in comparison to the other two transects (MS and FT). Communities also differed in reference to region (Bay versus Shelf). Bulk density and percent inorganic carbon were the only measured environmental factors that were correlated with community composition. (C) 2016 Elsevier Ltd. All rights reserved.