Nematode abundance in cold seep sediments of the Darwin mud volcano

During the JC-10 cruise (2007), we sampled the Darwin mud volcano (MV) for meiofaunal community and trophic structure in relation of pore-water geochemistry along a 10 m transect from a seep site on the rim of the crater towards the MV slope. Sediment samples were retrieved by the ROV Isis using pus...

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Bibliographic Details
Main Authors: Pape, Ellen, Vanreusel, Ann
Format: Dataset
Language:English
Published: PANGAEA 2012
Subjects:
34
Acantholaimus
Actinonema
Aegialoalaimus
Amphimonhystrella
Amphimonhystrella bullacauda
Anoplostoma
Antarcticonema
Anticoma
Anticyathus
Antomicron
Aponema
Axonolaimus
Bathyepsilonema
Bathyeurystomina
Calligyrus
Calyptronema
Camacolaimus
Campylaimus
Ceramonema
Cervonema
Chromadorella
Chromadorina
Chromadorita
Comesa
Counting
Crenopharynx
Cricohalalaimus
Cyartonema
Daptonema
Darwin Mounds
Deontolaimus
Depth
bottom/max
sediment/rock
top/min
Desmodora
Desmodora pilosa
Desmoscolex
Desmotricoma
Dichromadora
Didelta
Diplopeltula
Disconema
Dolicholaimus
Doliolaimus
Eleutherolaimus
Elzalia
Antarc*
Online Access:https://doi.pangaea.de/10.1594/PANGAEA.802807
https://doi.org/10.1594/PANGAEA.802807
Description
Summary:During the JC-10 cruise (2007), we sampled the Darwin mud volcano (MV) for meiofaunal community and trophic structure in relation of pore-water geochemistry along a 10 m transect from a seep site on the rim of the crater towards the MV slope. Sediment samples were retrieved by the ROV Isis using push cores. On board and after the pore water extraction, the top 10 cm of the cores were sliced into 1 cm sections and fixed them in 4% formaldehyde for meiofaunal community analysis. In the home laboratory, the formaldehyde-fixed samples were washed over a 32 µm mesh sieve and extracted the meiofauna from the sediment by Ludox centrifugation (Heip et al. 1985). Meiofauna was then sorted, enumerated and identified at coarse taxonomic level. From each slice, ca. 100 nematodes were identified to genus level. Afterwards, abundance of Nematoda were depth integrated over the top 5 cm to gain individual abundances per 10 cm**2. Overall, total nematode biomass in the top 5 cm of the seep sediment core was ~10x higher than that in the core taken 1100 m away. Nematode genus composition varied little among cores and was mainly dominated by Sabatieria.

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