Advanced search
1 file | 6.34 MB Add to list

A threefold perspective on the role of a pockmark in benthic faunal communities and biodiversity patterns

Author
Organization
Abstract
Pockmarks are circular-shaped depressions that increase seabed heterogeneity and are characterized by discontinuous fluid emissions. To understand how environmental conditions of pockmarks affect the structure of macroand meiofauna, we investigated two sites in a pockmark field in the northwestern Madagascar margin. In a comparative approach, we explored the community structure of the dominant taxa (Polychaeta, Nematoda and hyaline foraminifera) in each component (macro-, metazoan meiofauna and foraminifera, respectively). The investigated active pockmark showed approximately two times higher meiofauna abundance compared to in a site away from another pockmark field, but macrofauna showed the opposite trend, with almost half density at the pockmark site. However, at both sites, macroand meiofauna showed higher richness and abundance values in the top well-oxygenated layers of the sediment than in the underlaying ones. Polychaeta and Nematoda showed lower richness in the pockmark, opposed to hyaline foraminiferans, but lower evenness in the pockmark was found for the three groups. The detection of gas flares in the water column attests of the recent activity within the pockmark. High amount of sulfur-bearing minerals (mainly pyrite) evidences a production of dissolved free sulfides (not detected at the time of sampling) by sulfate reduction process driven by organic matter degradation and anaerobic oxidation of methane. Furthermore, recent increase in sedimentation rates in the past 70 years and organic matter inputs could have led to higher organic matter degradation rates resulting in reduced conditions and a high oxygen consumption. All this together seem to act as key factors in the determination of variation in richness, abundance and community composition of macrofauna and meiofauna. Additionally, some taxa seem to be more tolerant to these extreme conditions, such as species belonging to the Nematoda genus Desmodora and the phylum Kinorhyncha, which are highly abundant in the pockmark, and hence, may be considered as potential bioindicators of pockmark activity in this area. Further studies are required for a better assessment.
Keywords
Aquatic Science, Oceanography, Pockmark, Meiofauna, Macrofauna, Foraminifera, Nematoda, Polychaeta, SEEP MACROFAUNAL COMMUNITIES, EAST FLOWER GARDEN, METHANE SEEPS, NEMATODE ASSEMBLAGES, FORAMINIFERAL FAUNAS, CANYON BAY, IN-SITU, SEA, SULFIDE, OXYGEN

Downloads

  • (...).pdf
    • full text (Published version)
    • |
    • UGent only
    • |
    • PDF
    • |
    • 6.34 MB

Citation

Please use this url to cite or link to this publication:

MLA
Sánchez, Nuria, et al. “A Threefold Perspective on the Role of a Pockmark in Benthic Faunal Communities and Biodiversity Patterns.” DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS, vol. 167, 2021, doi:10.1016/j.dsr.2020.103425.
APA
Sánchez, N., Zeppilli, D., Baldrighi, E., Vanreusel, A., Lahitsiresy, M. G., Brandily, C., … Olu, K. (2021). A threefold perspective on the role of a pockmark in benthic faunal communities and biodiversity patterns. DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS, 167. https://doi.org/10.1016/j.dsr.2020.103425
Chicago author-date
Sánchez, Nuria, Daniela Zeppilli, Elisa Baldrighi, Ann Vanreusel, Max Gasimandova Lahitsiresy, Christophe Brandily, Lucie Pastor, et al. 2021. “A Threefold Perspective on the Role of a Pockmark in Benthic Faunal Communities and Biodiversity Patterns.” DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS 167. https://doi.org/10.1016/j.dsr.2020.103425.
Chicago author-date (all authors)
Sánchez, Nuria, Daniela Zeppilli, Elisa Baldrighi, Ann Vanreusel, Max Gasimandova Lahitsiresy, Christophe Brandily, Lucie Pastor, Lara Macheriotou, Guillermo García-Gómez, Stéphanie Dupré, and Karine Olu. 2021. “A Threefold Perspective on the Role of a Pockmark in Benthic Faunal Communities and Biodiversity Patterns.” DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS 167. doi:10.1016/j.dsr.2020.103425.
Vancouver
1.
Sánchez N, Zeppilli D, Baldrighi E, Vanreusel A, Lahitsiresy MG, Brandily C, et al. A threefold perspective on the role of a pockmark in benthic faunal communities and biodiversity patterns. DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS. 2021;167.
IEEE
[1]
N. Sánchez et al., “A threefold perspective on the role of a pockmark in benthic faunal communities and biodiversity patterns,” DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS, vol. 167, 2021.
@article{8687546,
  abstract     = {{Pockmarks are circular-shaped depressions that increase seabed heterogeneity and are characterized by discontinuous fluid emissions. To understand how environmental conditions of pockmarks affect the structure of macroand meiofauna, we investigated two sites in a pockmark field in the northwestern Madagascar margin. In a comparative approach, we explored the community structure of the dominant taxa (Polychaeta, Nematoda and hyaline foraminifera) in each component (macro-, metazoan meiofauna and foraminifera, respectively). The investigated active pockmark showed approximately two times higher meiofauna abundance compared to in a site away from another pockmark field, but macrofauna showed the opposite trend, with almost half density at the pockmark site. However, at both sites, macroand meiofauna showed higher richness and abundance values in the top well-oxygenated layers of the sediment than in the underlaying ones. Polychaeta and Nematoda showed lower richness in the pockmark, opposed to hyaline foraminiferans, but lower evenness in the pockmark was found for the three groups. The detection of gas flares in the water column attests of the recent activity within the pockmark. High amount of sulfur-bearing minerals (mainly pyrite) evidences a production of dissolved free sulfides (not detected at the time of sampling) by sulfate reduction process driven by organic matter degradation and anaerobic oxidation of methane. Furthermore, recent increase in sedimentation rates in the past 70 years and organic matter inputs could have led to higher organic matter degradation rates resulting in reduced conditions and a high oxygen consumption. All this together seem to act as key factors in the determination of variation in richness, abundance and community composition of macrofauna and meiofauna. Additionally, some taxa seem to be more tolerant to these extreme conditions, such as species belonging to the Nematoda genus Desmodora and the phylum Kinorhyncha, which are highly abundant in the pockmark, and hence, may be considered as potential bioindicators of pockmark activity in this area. Further studies are required for a better assessment.}},
  articleno    = {{103425}},
  author       = {{Sánchez, Nuria and Zeppilli, Daniela and Baldrighi, Elisa and Vanreusel, Ann and Lahitsiresy, Max Gasimandova and Brandily, Christophe and Pastor, Lucie and Macheriotou, Lara and García-Gómez, Guillermo and Dupré, Stéphanie and Olu, Karine}},
  issn         = {{0967-0637}},
  journal      = {{DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS}},
  keywords     = {{Aquatic Science,Oceanography,Pockmark,Meiofauna,Macrofauna,Foraminifera,Nematoda,Polychaeta,SEEP MACROFAUNAL COMMUNITIES,EAST FLOWER GARDEN,METHANE SEEPS,NEMATODE ASSEMBLAGES,FORAMINIFERAL FAUNAS,CANYON BAY,IN-SITU,SEA,SULFIDE,OXYGEN}},
  language     = {{eng}},
  pages        = {{17}},
  title        = {{A threefold perspective on the role of a pockmark in benthic faunal communities and biodiversity patterns}},
  url          = {{http://dx.doi.org/10.1016/j.dsr.2020.103425}},
  volume       = {{167}},
  year         = {{2021}},
}

Altmetric
View in Altmetric
Web of Science
Times cited: