Nematode communities from a natural oil seep off Svalbard
Cold-seep sediments, where active fluid seepage rich is observed, have been associated with the presence of endemic nematode communities. Under the scope of the AKMA project, a seep site located offshore Svalbard was sampled for the first time to investigate the Nematoda assemblages associated with...
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ftunivevora:oai:dspace.uevora.pt:10174/33934 2023-09-05T13:17:35+02:00 Nematode communities from a natural oil seep off Svalbard Balsa, J. Argentino, C. Riva, F. Adão, H. Panieri, G. Ramalho, S.P. 2022-12-05 http://hdl.handle.net/10174/33934 eng eng 18th International Meiofauna Conference João Balsa, Claudio Argentino, Federica Riva, Helena Adão, Giuliana Panieri, Sofia P. Ramalho, 2022. Nematode communities from a natural oil seep off Svalbard. 18th International Meiofauna Conference, 18thIMCO, 5-9th December, Wellington, New Zealand. http://hdl.handle.net/10174/33934 sim nao MARE e BIO nd hadao@uevora.pt 367 openAccess natural oil seep off Svalbard Nematodes lecture 2022 ftunivevora 2023-08-14T17:51:07Z Cold-seep sediments, where active fluid seepage rich is observed, have been associated with the presence of endemic nematode communities. Under the scope of the AKMA project, a seep site located offshore Svalbard was sampled for the first time to investigate the Nematoda assemblages associated with methane and crude oil seepage. Replicated samples were collected by means of the blade- and push-cores, on a bacterial mat where active gas and oil seepage was observed, as well as in sediments nearby without evident seepage activity, as reference. Sediments collected were used to characterize the community structure and diversity of the meiofauna taxa, particularly the nematode assemblages, as well as key environmental parameters (i.e, sediment and pore-water geochemistry, organic content, grain size). Preliminary observations showed no major differences in total meiofauna density between microhabitats, with a predominance of nematodes (>90%), followed by harpacticoid copepods and nauplii larvae, as typically seen in other deep-sea environments. However, an in-depth investigation into the nematode assemblages, revealed a low nematode diversity in the bacterial mats sediments, by comparison, to the reference. Bacterial mat-associated assemblages were predominantly composed of Halomonhystera sp.1 (39%), followed by a single Chromadoridae species (32%). Evidence of morphological and reproductive adaptations were observed in several of the species present and could be indicative of how these organisms are able to survive the toxic environmental conditions at this seep site, namely high concentrations of hydrogen sulphide and crude oil. These observations contribute to a large gap in the understanding of how infauna thrive in extreme environments in the Arctic. Lecture Arctic Svalbard Copepods Repositório Científico da Universidade de Évora Arctic Svalbard |
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Open Polar |
collection |
Repositório Científico da Universidade de Évora |
op_collection_id |
ftunivevora |
language |
English |
topic |
natural oil seep off Svalbard Nematodes |
spellingShingle |
natural oil seep off Svalbard Nematodes Balsa, J. Argentino, C. Riva, F. Adão, H. Panieri, G. Ramalho, S.P. Nematode communities from a natural oil seep off Svalbard |
topic_facet |
natural oil seep off Svalbard Nematodes |
description |
Cold-seep sediments, where active fluid seepage rich is observed, have been associated with the presence of endemic nematode communities. Under the scope of the AKMA project, a seep site located offshore Svalbard was sampled for the first time to investigate the Nematoda assemblages associated with methane and crude oil seepage. Replicated samples were collected by means of the blade- and push-cores, on a bacterial mat where active gas and oil seepage was observed, as well as in sediments nearby without evident seepage activity, as reference. Sediments collected were used to characterize the community structure and diversity of the meiofauna taxa, particularly the nematode assemblages, as well as key environmental parameters (i.e, sediment and pore-water geochemistry, organic content, grain size). Preliminary observations showed no major differences in total meiofauna density between microhabitats, with a predominance of nematodes (>90%), followed by harpacticoid copepods and nauplii larvae, as typically seen in other deep-sea environments. However, an in-depth investigation into the nematode assemblages, revealed a low nematode diversity in the bacterial mats sediments, by comparison, to the reference. Bacterial mat-associated assemblages were predominantly composed of Halomonhystera sp.1 (39%), followed by a single Chromadoridae species (32%). Evidence of morphological and reproductive adaptations were observed in several of the species present and could be indicative of how these organisms are able to survive the toxic environmental conditions at this seep site, namely high concentrations of hydrogen sulphide and crude oil. These observations contribute to a large gap in the understanding of how infauna thrive in extreme environments in the Arctic. |
format |
Lecture |
author |
Balsa, J. Argentino, C. Riva, F. Adão, H. Panieri, G. Ramalho, S.P. |
author_facet |
Balsa, J. Argentino, C. Riva, F. Adão, H. Panieri, G. Ramalho, S.P. |
author_sort |
Balsa, J. |
title |
Nematode communities from a natural oil seep off Svalbard |
title_short |
Nematode communities from a natural oil seep off Svalbard |
title_full |
Nematode communities from a natural oil seep off Svalbard |
title_fullStr |
Nematode communities from a natural oil seep off Svalbard |
title_full_unstemmed |
Nematode communities from a natural oil seep off Svalbard |
title_sort |
nematode communities from a natural oil seep off svalbard |
publisher |
18th International Meiofauna Conference |
publishDate |
2022 |
url |
http://hdl.handle.net/10174/33934 |
geographic |
Arctic Svalbard |
geographic_facet |
Arctic Svalbard |
genre |
Arctic Svalbard Copepods |
genre_facet |
Arctic Svalbard Copepods |
op_relation |
João Balsa, Claudio Argentino, Federica Riva, Helena Adão, Giuliana Panieri, Sofia P. Ramalho, 2022. Nematode communities from a natural oil seep off Svalbard. 18th International Meiofauna Conference, 18thIMCO, 5-9th December, Wellington, New Zealand. http://hdl.handle.net/10174/33934 sim nao MARE e BIO nd hadao@uevora.pt 367 |
op_rights |
openAccess |
_version_ |
1776198710591488000 |