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Vertical distribution and respiration rates of benthic foraminifera : Contribution to aerobic remineralization in intertidal mudflats covered by Zostera noltei meadows

Cesbron, F.; Geslin, E.; Jorissen, F. J.; Delgard, M. L.; Charrieau, L. LU ; Deflandre, B.; Jézéquel, D.; Anschutz, P. and Metzger, E. (2016) In Estuarine, Coastal and Shelf Science 179. p.23-38
Abstract

The present study investigates the influence of seagrass root systems on benthic hard-shelled meiofauna (foraminifera). In February and July 2011, sediment cores were collected at low tide at two sites in Arcachon lagoon, a vegetated site with Zostera noltei and a second site with bare sediments. We used the highly discriminative CellTracker™ Green fluorogenic probe technique to recognize living foraminifera and to describe foraminiferal density and diversity. Three dominant species of foraminifera were observed: Ammonia tepida, Haynesina germanica and Eggerella scabra. The two calcareous species, A. tepida and H. germanica, were preferentially found in the upper half to 1 cm of the sediment. At the vegetated site, these two species had... (More)

The present study investigates the influence of seagrass root systems on benthic hard-shelled meiofauna (foraminifera). In February and July 2011, sediment cores were collected at low tide at two sites in Arcachon lagoon, a vegetated site with Zostera noltei and a second site with bare sediments. We used the highly discriminative CellTracker™ Green fluorogenic probe technique to recognize living foraminifera and to describe foraminiferal density and diversity. Three dominant species of foraminifera were observed: Ammonia tepida, Haynesina germanica and Eggerella scabra. The two calcareous species, A. tepida and H. germanica, were preferentially found in the upper half to 1 cm of the sediment. At the vegetated site, these two species had a slightly deeper microhabitat. In the literature, both species have been described alive in much deeper sediment layers, possibly due to false positives from the Rose Bengal staining method. These two species also showed 1) higher densities at the site with Z. noltei, 2) a higher density in February when conditions were supposed optimal due to a microphytobenthos bloom, and 3) dissolved calcitic shells in July, probably resulting from a lower pH. The agglutinated species E. scabra was present alive down to at least 7 cm depth. E. scabra showed high densities in the anoxic part of the sediment at both the vegetated and bare sites, with a substantially higher density in summer at the site with bare sediments. Its presence at depth may be related to its trophic requirements; this species could be less dependent on labile organic matter than A. tepida and H. germanica. On this intertidal mudflat, the foraminiferal contribution to aerobic carbon remineralization, based on respiration rate measurements, can account for up to 7% of the diffusive oxygen uptake, almost five times more than the maximum contribution recorded in open marine environments (300 m depth) in the Bay of Biscay.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Biogeochemistry, Carbon remineralization, Living benthic foraminifera, Microhabitat, Zostera noltei
in
Estuarine, Coastal and Shelf Science
volume
179
pages
16 pages
publisher
Elsevier
external identifiers
  • scopus:84969745985
  • wos:000381531600004
ISSN
0272-7714
DOI
10.1016/j.ecss.2015.12.005
language
English
LU publication?
yes
id
bcdfa55b-2ab7-4028-bd7f-ebac12df6458
date added to LUP
2016-11-02 14:59:56
date last changed
2017-09-10 05:11:13
@article{bcdfa55b-2ab7-4028-bd7f-ebac12df6458,
  abstract     = {<p>The present study investigates the influence of seagrass root systems on benthic hard-shelled meiofauna (foraminifera). In February and July 2011, sediment cores were collected at low tide at two sites in Arcachon lagoon, a vegetated site with Zostera noltei and a second site with bare sediments. We used the highly discriminative CellTracker™ Green fluorogenic probe technique to recognize living foraminifera and to describe foraminiferal density and diversity. Three dominant species of foraminifera were observed: Ammonia tepida, Haynesina germanica and Eggerella scabra. The two calcareous species, A. tepida and H. germanica, were preferentially found in the upper half to 1 cm of the sediment. At the vegetated site, these two species had a slightly deeper microhabitat. In the literature, both species have been described alive in much deeper sediment layers, possibly due to false positives from the Rose Bengal staining method. These two species also showed 1) higher densities at the site with Z. noltei, 2) a higher density in February when conditions were supposed optimal due to a microphytobenthos bloom, and 3) dissolved calcitic shells in July, probably resulting from a lower pH. The agglutinated species E. scabra was present alive down to at least 7 cm depth. E. scabra showed high densities in the anoxic part of the sediment at both the vegetated and bare sites, with a substantially higher density in summer at the site with bare sediments. Its presence at depth may be related to its trophic requirements; this species could be less dependent on labile organic matter than A. tepida and H. germanica. On this intertidal mudflat, the foraminiferal contribution to aerobic carbon remineralization, based on respiration rate measurements, can account for up to 7% of the diffusive oxygen uptake, almost five times more than the maximum contribution recorded in open marine environments (300 m depth) in the Bay of Biscay.</p>},
  author       = {Cesbron, F. and Geslin, E. and Jorissen, F. J. and Delgard, M. L. and Charrieau, L. and Deflandre, B. and Jézéquel, D. and Anschutz, P. and Metzger, E.},
  issn         = {0272-7714},
  keyword      = {Biogeochemistry,Carbon remineralization,Living benthic foraminifera,Microhabitat,Zostera noltei},
  language     = {eng},
  month        = {09},
  pages        = {23--38},
  publisher    = {Elsevier},
  series       = {Estuarine, Coastal and Shelf Science},
  title        = {Vertical distribution and respiration rates of benthic foraminifera : Contribution to aerobic remineralization in intertidal mudflats covered by Zostera noltei meadows},
  url          = {http://dx.doi.org/10.1016/j.ecss.2015.12.005},
  volume       = {179},
  year         = {2016},
}