Hydrothermal activity lowers trophic diversity in Antarctic hydrothermal sediments
-
Published:2017-12-20
Issue:24
Volume:14
Page:5705-5725
-
ISSN:1726-4189
-
Container-title:Biogeosciences
-
language:en
-
Short-container-title:Biogeosciences
Author:
Bell James B., Reid William D. K.ORCID, Pearce David A., Glover Adrian G.ORCID, Sweeting Christopher J., Newton JasonORCID, Woulds ClareORCID
Abstract
Abstract. Hydrothermal sediments are those in which hydrothermal fluid is discharged through sediments and are one of the least studied deep-sea ecosystems. We present a combination of microbial and biochemical data to assess trophodynamics between and within hydrothermal and background areas of the Bransfield Strait (1050–1647 m of depth). Microbial composition, biomass, and fatty acid signatures varied widely between and within hydrothermally active and background sites, providing evidence of diverse metabolic activity. Several species had different feeding strategies and trophic positions between hydrothermally active and inactive areas, and the stable isotope values of consumers were not consistent with feeding morphology. Niche area and the diversity of microbial fatty acids was lowest at the most hydrothermally active site, reflecting trends in species diversity. Faunal uptake of chemosynthetically produced organics was relatively limited but was detected at both hydrothermal and non-hydrothermal sites, potentially suggesting that hydrothermal activity can affect trophodynamics over a much wider area than previously thought.
Publisher
Copernicus GmbH
Subject
Earth-Surface Processes,Ecology, Evolution, Behavior and Systematics
Reference105 articles.
1. Adams, T. S. and Sterner, R. W.: The effect of dietary nitrogen content on trophic level 15N enrichment, Limnol. Oceanogr., 45, 601–607, 2000. 2. Aquilina, A., Connelly, D. P., Copley, J. T., Green, D. R., Hawkes, J. A., Hepburn, L., Huvenne, V. A., Marsh, L., Mills, R. A., and Tyler, P. A.: Geochemical and Visual Indicators of Hydrothermal Fluid Flow through a Sediment-Hosted Volcanic Ridge in the Central Bransfield Basin (Antarctica), Plos One, 8, e54686, https://doi.org/10.1371/journal.pone.0054686, 2013. 3. Aquilina, A., Homoky, W. B., Hawkes, J. A., Lyons, T. W., and Mills, R. A.: Hydrothermal sediments are a source of water column Fe and Mn in the Bransfield Strait, Antarctica, Geochim. Cosmochim. Ac., 137, 64–80, 2014. 4. Bell, J. B., Aquilina, A., Woulds, C., Glover, A. G., Little, C. T. S., Reid, W. D. K., Hepburn, L. E., Newton, J., and Mills, R. A.: Geochemistry, faunal composition and trophic structure at an area of weak methane seepage on the southwest South Georgia margin, Roy. Soc. Open Sci., 3, 160284, https://doi.org/10.1098/rsos.160284, 2016a. 5. Bell, J. B., Woulds, C., Brown, L. E., Little, C. T. S., Sweeting, C. J., Reid, W. D. K., and Glover, A. G.: Macrofaunal ecology of sedimented hydrothermal vents in the Bransfield Strait, Antarctica, Front. Mar. Sci., 3, 32, 2016b.
Cited by
9 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献
|
|