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Benthic carbon fixation and cycling in diffuse hydrothermal and background sediments in the Bransfield Strait, Antarctica
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| Zeitschriftentitel: | Biogeosciences |
|---|---|
| Personen und Körperschaften: | , , , , |
| In: | Biogeosciences, 17, 2020, 1, S. 1-12 |
| Format: | E-Article |
| Sprache: | Englisch |
| veröffentlicht: |
Copernicus GmbH
|
| Schlagwörter: |
| author_facet |
Woulds, Clare Bell, James B. Glover, Adrian G. Bouillon, Steven Brown, Louise S. Woulds, Clare Bell, James B. Glover, Adrian G. Bouillon, Steven Brown, Louise S. |
|---|---|
| author |
Woulds, Clare Bell, James B. Glover, Adrian G. Bouillon, Steven Brown, Louise S. |
| spellingShingle |
Woulds, Clare Bell, James B. Glover, Adrian G. Bouillon, Steven Brown, Louise S. Biogeosciences Benthic carbon fixation and cycling in diffuse hydrothermal and background sediments in the Bransfield Strait, Antarctica Earth-Surface Processes Ecology, Evolution, Behavior and Systematics |
| author_sort |
woulds, clare |
| spelling |
Woulds, Clare Bell, James B. Glover, Adrian G. Bouillon, Steven Brown, Louise S. 1726-4189 Copernicus GmbH Earth-Surface Processes Ecology, Evolution, Behavior and Systematics http://dx.doi.org/10.5194/bg-17-1-2020 <jats:p>Abstract. Sedimented hydrothermal vents are likely to be widespread compared to hard substrate hot vents. They host chemosynthetic microbial communities which fix inorganic carbon (C) at the seafloor, as well as a wide range of macroinfauna, including vent-obligate and background non-vent taxa. There are no previous direct observations of carbon cycling at a sedimented hydrothermal vent. We conducted 13C isotope tracing experiments at three sedimented sites in the Bransfield Strait, Antarctica, which showed different degrees of hydrothermalism. Two experimental treatments were applied, with 13C added as either algal detritus (photosynthetic C), or as bicarbonate (substrate for benthic C fixation). Algal 13C was taken up by both bacteria and metazoan macrofaunal, but its dominant fate was respiration, as observed at deeper and more food-limited sites elsewhere. Rates of 13C uptake and respiration suggested that the diffuse hydrothermal site was not the hot spot of benthic C cycling that we hypothesised it would be. Fixation of inorganic C into bacterial biomass was observed at all sites, and was measurable at two out of three sites. At all sites, newly fixed C was transferred to metazoan macrofauna. Fixation rates were relatively low compared with similar experiments elsewhere; thus, C fixed at the seafloor was a minor C source for the benthic ecosystem. However, as the greatest amount of benthic C fixation occurred at the “Off Vent” (non-hydrothermal) site (0.077±0.034 mg C m−2 fixed during 60 h), we suggest that benthic fixation of inorganic C is more widespread than previously thought, and warrants further study. </jats:p> Benthic carbon fixation and cycling in diffuse hydrothermal and background sediments in the Bransfield Strait, Antarctica Biogeosciences |
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Copernicus GmbH, 2020 |
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| title |
Benthic carbon fixation and cycling in diffuse hydrothermal and background sediments in the Bransfield Strait, Antarctica |
| title_unstemmed |
Benthic carbon fixation and cycling in diffuse hydrothermal and background sediments in the Bransfield Strait, Antarctica |
| title_full |
Benthic carbon fixation and cycling in diffuse hydrothermal and background sediments in the Bransfield Strait, Antarctica |
| title_fullStr |
Benthic carbon fixation and cycling in diffuse hydrothermal and background sediments in the Bransfield Strait, Antarctica |
| title_full_unstemmed |
Benthic carbon fixation and cycling in diffuse hydrothermal and background sediments in the Bransfield Strait, Antarctica |
| title_short |
Benthic carbon fixation and cycling in diffuse hydrothermal and background sediments in the Bransfield Strait, Antarctica |
| title_sort |
benthic carbon fixation and cycling in diffuse hydrothermal and background sediments in the bransfield strait, antarctica |
| topic |
Earth-Surface Processes Ecology, Evolution, Behavior and Systematics |
| url |
http://dx.doi.org/10.5194/bg-17-1-2020 |
| publishDate |
2020 |
| physical |
1-12 |
| description |
<jats:p>Abstract. Sedimented hydrothermal vents are likely to be widespread compared to hard
substrate hot vents. They host chemosynthetic microbial communities which
fix inorganic carbon (C) at the seafloor, as well as a wide range of macroinfauna,
including vent-obligate and background non-vent taxa. There are no previous
direct observations of carbon cycling at a sedimented hydrothermal vent. We
conducted 13C isotope tracing experiments at three sedimented sites in the
Bransfield Strait, Antarctica, which showed different degrees of
hydrothermalism. Two experimental treatments were applied, with 13C
added as either algal detritus (photosynthetic C), or as bicarbonate
(substrate for benthic C fixation). Algal 13C was taken up by both
bacteria and metazoan macrofaunal, but its dominant fate was respiration, as
observed at deeper and more food-limited sites elsewhere. Rates of 13C
uptake and respiration suggested that the diffuse hydrothermal site was not
the hot spot of benthic C cycling that we hypothesised it would be. Fixation
of inorganic C into bacterial biomass was observed at all sites, and was
measurable at two out of three sites. At all sites, newly fixed C was transferred
to metazoan macrofauna. Fixation rates were relatively low compared with
similar experiments elsewhere; thus, C fixed at the seafloor was a minor C
source for the benthic ecosystem. However, as the greatest amount of benthic
C fixation occurred at the “Off Vent” (non-hydrothermal) site (0.077±0.034 mg C m−2 fixed during 60 h), we suggest that benthic fixation of
inorganic C is more widespread than previously thought, and warrants further
study.
</jats:p> |
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| author | Woulds, Clare, Bell, James B., Glover, Adrian G., Bouillon, Steven, Brown, Louise S. |
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| description | <jats:p>Abstract. Sedimented hydrothermal vents are likely to be widespread compared to hard substrate hot vents. They host chemosynthetic microbial communities which fix inorganic carbon (C) at the seafloor, as well as a wide range of macroinfauna, including vent-obligate and background non-vent taxa. There are no previous direct observations of carbon cycling at a sedimented hydrothermal vent. We conducted 13C isotope tracing experiments at three sedimented sites in the Bransfield Strait, Antarctica, which showed different degrees of hydrothermalism. Two experimental treatments were applied, with 13C added as either algal detritus (photosynthetic C), or as bicarbonate (substrate for benthic C fixation). Algal 13C was taken up by both bacteria and metazoan macrofaunal, but its dominant fate was respiration, as observed at deeper and more food-limited sites elsewhere. Rates of 13C uptake and respiration suggested that the diffuse hydrothermal site was not the hot spot of benthic C cycling that we hypothesised it would be. Fixation of inorganic C into bacterial biomass was observed at all sites, and was measurable at two out of three sites. At all sites, newly fixed C was transferred to metazoan macrofauna. Fixation rates were relatively low compared with similar experiments elsewhere; thus, C fixed at the seafloor was a minor C source for the benthic ecosystem. However, as the greatest amount of benthic C fixation occurred at the “Off Vent” (non-hydrothermal) site (0.077±0.034 mg C m−2 fixed during 60 h), we suggest that benthic fixation of inorganic C is more widespread than previously thought, and warrants further study. </jats:p> |
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| spelling | Woulds, Clare Bell, James B. Glover, Adrian G. Bouillon, Steven Brown, Louise S. 1726-4189 Copernicus GmbH Earth-Surface Processes Ecology, Evolution, Behavior and Systematics http://dx.doi.org/10.5194/bg-17-1-2020 <jats:p>Abstract. Sedimented hydrothermal vents are likely to be widespread compared to hard substrate hot vents. They host chemosynthetic microbial communities which fix inorganic carbon (C) at the seafloor, as well as a wide range of macroinfauna, including vent-obligate and background non-vent taxa. There are no previous direct observations of carbon cycling at a sedimented hydrothermal vent. We conducted 13C isotope tracing experiments at three sedimented sites in the Bransfield Strait, Antarctica, which showed different degrees of hydrothermalism. Two experimental treatments were applied, with 13C added as either algal detritus (photosynthetic C), or as bicarbonate (substrate for benthic C fixation). Algal 13C was taken up by both bacteria and metazoan macrofaunal, but its dominant fate was respiration, as observed at deeper and more food-limited sites elsewhere. Rates of 13C uptake and respiration suggested that the diffuse hydrothermal site was not the hot spot of benthic C cycling that we hypothesised it would be. Fixation of inorganic C into bacterial biomass was observed at all sites, and was measurable at two out of three sites. At all sites, newly fixed C was transferred to metazoan macrofauna. Fixation rates were relatively low compared with similar experiments elsewhere; thus, C fixed at the seafloor was a minor C source for the benthic ecosystem. However, as the greatest amount of benthic C fixation occurred at the “Off Vent” (non-hydrothermal) site (0.077±0.034 mg C m−2 fixed during 60 h), we suggest that benthic fixation of inorganic C is more widespread than previously thought, and warrants further study. </jats:p> Benthic carbon fixation and cycling in diffuse hydrothermal and background sediments in the Bransfield Strait, Antarctica Biogeosciences |
| spellingShingle | Woulds, Clare, Bell, James B., Glover, Adrian G., Bouillon, Steven, Brown, Louise S., Biogeosciences, Benthic carbon fixation and cycling in diffuse hydrothermal and background sediments in the Bransfield Strait, Antarctica, Earth-Surface Processes, Ecology, Evolution, Behavior and Systematics |
| title | Benthic carbon fixation and cycling in diffuse hydrothermal and background sediments in the Bransfield Strait, Antarctica |
| title_full | Benthic carbon fixation and cycling in diffuse hydrothermal and background sediments in the Bransfield Strait, Antarctica |
| title_fullStr | Benthic carbon fixation and cycling in diffuse hydrothermal and background sediments in the Bransfield Strait, Antarctica |
| title_full_unstemmed | Benthic carbon fixation and cycling in diffuse hydrothermal and background sediments in the Bransfield Strait, Antarctica |
| title_short | Benthic carbon fixation and cycling in diffuse hydrothermal and background sediments in the Bransfield Strait, Antarctica |
| title_sort | benthic carbon fixation and cycling in diffuse hydrothermal and background sediments in the bransfield strait, antarctica |
| title_unstemmed | Benthic carbon fixation and cycling in diffuse hydrothermal and background sediments in the Bransfield Strait, Antarctica |
| topic | Earth-Surface Processes, Ecology, Evolution, Behavior and Systematics |
| url | http://dx.doi.org/10.5194/bg-17-1-2020 |