Report of epibenthic macrofauna found from Haima cold seeps and adjacent deep-sea habitats, South China Sea

Dong, Dong; Li, Xinzheng; Yang, Mei; Gong, Lin; Yang, Li; Sui, Jixing; Gan, Zhibin; Kou, Qi; Xiao, Ning; Zhang, Junlong

doi:10.1007/s42995-020-00073-9

Cited by 32 publications

(26 citation statements)

References 37 publications

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“…So far, gregarine apicomplexans have been only reported from 0.32% of invertebrate species (Levine, 2018 ). There is a well-known high diversity of benthic invertebrates in coastal and deep oceans (Dong et al, 2021 ), highlighting that a great diversity of gregarines/apicomplexans awaits to be unveiled and linked to their hosts, as we have shown in this study.…”

Section: Discussionsupporting

confidence: 55%

Seagrass Colonization Alters Diversity, Abundance, Taxonomic, and Functional Community Structure of Benthic Microbial Eukaryotes

Pan

et al. 2022

Front. Microbiol.

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Seagrass form high productive ecosystems in coastal environments. However, the effects of these coastal plants on the structure and function of the belowground eukaryotic microbiome remain elusive. In this study, we characterized the community of microbial eukaryotes (microeukaryotes) in both vegetated and unvegetated sediments using 18S rRNA gene amplicon sequencing and quantitative PCR. Analysis of sequencing data showed that the eelgrass (Zostera marina) colonization decreased the alpha diversity indices of benthic microeukaryotes. Apicomplexa represented an average of 83% of reads across all samples, with a higher proportion at the vegetated sites. The taxonomic community structure was significantly different between these two types of sediments, for which the concentration of NH4+ in sediment porewater and salinity could account. Phylogenetic analyses of long 18S rRNA genes (around 1,030 bp) indicated these apicomplexan parasites are closely related to gregarine Lecudina polymorpha. Determination of 18S rRNA gene abundances provided evidence that the eelgrass markedly promoted the biomass of the gregarine and all microeukaryotes in the seagrass-colonized sediments and confirmed that the gregarine was hosted by a polychaete species. Significantly higher gene abundances of heterotrophs and mixotrophs were found at the vegetated sites, which could be explained by the finer sediments and short supply of dissolved inorganic nitrogen, respectively. The pigmented protists were more abundant in 18S rRNA gene copies at the lower and higher pH levels than at the intermediate. Nevertheless, the fractions of heterotrophs and phototrophs in the community were significantly related to porewater N:P ratio. These results indicate that seagrass colonization significantly induces an increase in overall biomass and a decrease in diversity of benthic microeukaryotes, making them more heterotrophic. This study also highlights that the hotspot of eukaryotic parasites could be linked with the high productivity of a natural ecosystem.

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Section: Discussionsupporting

confidence: 55%

Seagrass Colonization Alters Diversity, Abundance, Taxonomic, and Functional Community Structure of Benthic Microbial Eukaryotes

Pan

et al. 2022

Front. Microbiol.

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“…In the present study, we identified 12 macrobenthic species from five phyla, and 12 families in the Haima cold seep surveys. By comparison, Dong et al (2021) detected 24 macrofauna species in Haima cold seep. This apparent difference in species richness may be explained by differences in sampling effort (Nakajima et al, 2014).…”

Section: Discussion Species Diversity and Community Structure Of Macr...mentioning

confidence: 98%

“…The collected species were photographed immediately after being transported to the deck, then placed in liquid nitrogen and stored at -80°C. Morphological characteristics were used to preliminarily identify species for collected organisms according to relevant references (Zhao et al, 2020;Dong et al, 2021), and DNA barcodes were used for further species identification. The description of the species identified was given in supplementary electronic material.…”

Section: Sample Collection and Species Identificationmentioning

confidence: 99%

“…Therefore, there is an urgent need for efficient biodiversity surveys to inform conservation. Studies on biodiversity of some deep-sea species in Haima cold seep have been reported Dong et al, 2021;Ke et al, 2022); however, knowledge on community characteristics and genetic diversity of macrobenthos in Haima cold seep remains limited. As Haima cold seep is increasingly being assessed for its gas hydrate mineral wealth, baseline data on the biodiversity of benthic invertebrates is needed for effective management and ecosystem protection (Everett and Park, 2018).…”

Section: Introductionmentioning

confidence: 99%

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Community Characteristics and Genetic Diversity of Macrobenthos in Haima Cold Seep

et al. 2022

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Knowledge about community structure and genetic diversity can help assess the potential for change in the loss and restoration of biodiversity, thereby facilitating effective management and ecosystem protection. Macroinvertebrate communities are an important biotic component of deep sea cold seep ecosystems. As Haima cold seep is increasingly being assessed for its potential gas hydrate mineral wealth, knowledge of community characteristics and genetic diversity of macrobenthos is needed to anticipate the potential impacts on biodiversity. In this study, we examined species diversity and community structure at five sites in the Haima cold seep using a remote-operated vehicle (ROV) for in situ surveying. The results identified 12 macrobenthic species from 5 phyla and 12 families. The macrobenthos community could be divided into two communities (H1 and H2=mussel bed community, and H3 and H4= vesicomyid clams community) based on CLUSTER and NMDS analyses. Gigantidas haimaensis (Mollusca), Branchipolynoe pettiboneae (Annelida), and Histampica haimaensis (Echinodermata) were most dominant within their respective phyla, with values of the dominance of 0.160, 0.021 and 0.114, respectively. The genetic diversity of these three typical macrobenthic species in the Haima cold seep was evaluated using the mitochondrial cytochrome c oxidase subunit I (COI) gene, haplotype, and nucleotide diversity values were 0.651 to 0.912 and 0.00148 to 0.00812, respectively, representing high haplotype diversity but low nucleotide diversity. Finally, mitochondrial concatenated dataset (MCD) sequences from three mitochondrial genes (ATP6, COI, and NAD4) and 294,734 genome-wide single nucleotide polymorphisms (SNPs) from restriction site-associated DNA-sequencing (RAD-seq) data were obtained from 60 individuals from two sites (H1 and H2), providing deep insight into the genetic diversity and structure of G. haimaensis, the engineer species in Haima cold seep. No significant genetic differentiation between G. haimaensis in H1 and H2 was detected based on MCD sequences. Nevertheless, when using SNP datasets, a small but clear genetic subdivision between G. haimaensis in the two sites as revealed by STRUCTURE and principal component analysis (PCA). The results comprehensively illuminate macrobenthos biodiversity in the Haima cold seep ecosystem and provide a baseline against which population dynamics may be assessed in the future.

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“…Figure16. The distributions of the species of Iridogorgia, based on the data of references[4][5][6][7][8][10][11][12][13][14]39,40,43].…”

mentioning

confidence: 99%

Morphological and Molecular Characterization of Five Species Including Three New Species of Golden Gorgonians (Cnidaria: Octocorallia) from Seamounts in the Western Pacific

Zhan

2021

Biology

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Members of genus Iridogorgia Verrill, 1883 are the typical deep-sea megabenthos with only seven species reported. Based on an integrated morphological-molecular approach, eight sampled specimens of Iridogorgia from seamounts in the tropical Western Pacific are identified as three new species, and two known species I. magnispiralis Watling, 2007 and I. densispicula Xu, Zhan, Li and Xu, 2020. Iridogorgia flexilis sp. nov. is unique in having a very broad polyp body base with stout and thick scales. Iridogorgia densispiralis sp. nov. can be distinguished by rods present in both polyps and coenenchyme, and I. verrucosa sp. nov. is characterized by having numerous verrucae in coenenchyme and irregular spindles and scales in the polyp body wall. Phylogenetic analysis based on the nuclear 28S rDNA indicated that I. densispiralis sp. nov. showed close relationships with I. splendens Watling, 2007 and I. verrucosa sp. nov., and I. flexilis sp. nov. formed a sister clade with I. magnispiralis. In addition, due to Rhodaniridogorgia fragilis Watling, 2007 nested into the Iridogorgia clade in mtMutS-COI trees and shared highly similar morphology to the latter, we propose to eliminate the genus Rhodaniridogorgia by establishing a new combination Iridogorgia fragilis (Watling, 2007) comb. nov. and resurrecting I. superba Nutting, 1908.

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Report of epibenthic macrofauna found from Haima cold seeps and adjacent deep-sea habitats, South China Sea

Cited by 32 publications

References 37 publications

Seagrass Colonization Alters Diversity, Abundance, Taxonomic, and Functional Community Structure of Benthic Microbial Eukaryotes

Seagrass Colonization Alters Diversity, Abundance, Taxonomic, and Functional Community Structure of Benthic Microbial Eukaryotes

Community Characteristics and Genetic Diversity of Macrobenthos in Haima Cold Seep

Morphological and Molecular Characterization of Five Species Including Three New Species of Golden Gorgonians (Cnidaria: Octocorallia) from Seamounts in the Western Pacific

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