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Food-Web Complexity in Guaymas Basin Hydrothermal Vents and Cold Seeps.

Author(s): Portail M, Olu K, Dubois SF, Escobar-Briones E, Gelinas Y, Menot L, Sarrazin J

PLoS One. 2016;11(9):e0162263 Authors: Portail M, Olu K, Dubois SF, Escobar-Briones E, Gelinas Y, Menot L, Sarrazin J

Article GUID: 27683216
Preservation of organic matter in marine sediments by inner-sphere interactions with reactive iron.

Author(s): Barber A, Brandes J, Leri A, Lalonde K, Balind K, Wirick S, Wang J, Gélinas Y

Sci Rep. 2017 03 23;7(1):366 Authors: Barber A, Brandes J, Leri A, Lalonde K, Balind K, Wirick S, Wang J, Gélinas Y

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Differences in Riverine and Pond Water Dissolved Organic Matter Composition and Sources in Canadian High Arctic Watersheds Affected by Active Layer Detachments.

Author(s): Wang JJ, Lafrenière MJ, Lamoureux SF, Simpson AJ, Gélinas Y, Simpson MJ

Environ Sci Technol. 2018 Feb 06;52(3):1062-1071 Authors: Wang JJ, Lafrenière MJ, Lamoureux SF, Simpson AJ, Gélinas Y, Simpson MJ

Article GUID: 29301070
Title:Food-Web Complexity in Guaymas Basin Hydrothermal Vents and Cold Seeps.
Authors:Portail M,  Olu K,  Dubois SF,  Escobar-Briones E,  Gelinas Y,  Menot L,  Sarrazin J
Link:https://www.ncbi.nlm.nih.gov/pubmed/27683216?dopt=Abstract
Category:PLoS One
PMID:27683216
Dept Affiliation: CHEMBIOCHEM
1 Laboratoire Environnement Profond, REM/EEP, Institut Carnot Ifremer EDROME, Centre de Bretagne, Plouzané, France.
2 Laboratoire Ecologie Benthique, DYNECO, Ifremer, Centre de Bretagne, Plouzané, France.
3 Instituto de Ciencias del Mar y Limnología, Universidad Nacional Autónoma de México, Mexico City D.F., Mexico.
4 GEOTOP and Chemistry and Biochemistry Department, Concordia University, Montréal, Québec, Canada.

Description:

Food-Web Complexity in Guaymas Basin Hydrothermal Vents and Cold Seeps.

PLoS One. 2016;11(9):e0162263

Authors: Portail M, Olu K, Dubois SF, Escobar-Briones E, Gelinas Y, Menot L, Sarrazin J

Abstract

In the Guaymas Basin, the presence of cold seeps and hydrothermal vents in close proximity, similar sedimentary settings and comparable depths offers a unique opportunity to assess and compare the functioning of these deep-sea chemosynthetic ecosystems. The food webs of five seep and four vent assemblages were studied using stable carbon and nitrogen isotope analyses. Although the two ecosystems shared similar potential basal sources, their food webs differed: seeps relied predominantly on methanotrophy and thiotrophy via the Calvin-Benson-Bassham (CBB) cycle and vents on petroleum-derived organic matter and thiotrophy via the CBB and reductive tricarboxylic acid (rTCA) cycles. In contrast to symbiotic species, the heterotrophic fauna exhibited high trophic flexibility among assemblages, suggesting weak trophic links to the metabolic diversity of chemosynthetic primary producers. At both ecosystems, food webs did not appear to be organised through predator-prey links but rather through weak trophic relationships among co-occurring species. Examples of trophic or spatial niche differentiation highlighted the importance of species-sorting processes within chemosynthetic ecosystems. Variability in food web structure, addressed through Bayesian metrics, revealed consistent trends across ecosystems. Food-web complexity significantly decreased with increasing methane concentrations, a common proxy for the intensity of seep and vent fluid fluxes. Although high fluid-fluxes have the potential to enhance primary productivity, they generate environmental constraints that may limit microbial diversity, colonisation of consumers and the structuring role of competitive interactions, leading to an overall reduction of food-web complexity and an increase in trophic redundancy. Heterogeneity provided by foundation species was identified as an additional structuring factor. According to their biological activities, foundation species may have the potential to partly release the competitive pressure within communities of low fluid-flux habitats. Finally, ecosystem functioning in vents and seeps was highly similar despite environmental differences (e.g. physico-chemistry, dominant basal sources) suggesting that ecological niches are not specifically linked to the nature of fluids. This comparison of seep and vent functioning in the Guaymas basin thus provides further supports to the hypothesis of continuity among deep-sea chemosynthetic ecosystems.

PMID: 27683216 [PubMed]