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Response of the benthic foraminiferal community to a simulated short-term phytodetritus pulse in the abyssal North Pacific

Enge, A.J., Nomaki, H., Ogawa, N.O., Witte, U., Moeseneder, M.M., Lavik, G, Ohkouchi, N, Kitazato, H, Kučera, M and Heinz, P (2011) Response of the benthic foraminiferal community to a simulated short-term phytodetritus pulse in the abyssal North Pacific Marine Ecology Progress Series, 438, pp. 129-142. (doi:10.3354/meps09298).

Record type: Article

Abstract

Foraminifera are an important faunal element of the abyssal ecosystem and largely depend on deposited particulate organic matter from the photic zone to sustain their metabolism for growth and reproduction. However, their role in the carbon cycle in deep-sea sediments is insufficiently studied. We investigated benthic foraminifera at Station M (4000 m depth) in the Northeast Pacific and assessed the response of individual species to a simulated phytodetritus pulse during an in situ feeding experiment. Sediments were incubated for 4 d with 13C-labeled diatoms (Thalassiosira weissflogii) applied to the sediment surface. The living foraminiferal community (>0.063 mm) of the upper 3 cm contained >100 species and was strongly dominated by a few taxa of soft-walled saccamminids. Population density of the entire living foraminiferal community was highest at the sediment surface (mean ± SD = 279 ± 72 ind. 10 cm?3 in background and 13C-incubated cores) and decreased gradually with depth. Large differences were observed in the uptake of the algal material among species and between depth levels. During the experiment, 0.82 mg C m?2 were ingested, mainly by calcareous (~60%) and agglutinated (~40%) foraminifera. Uptake was highest at the sediment surface and 3 to 5 times less in deeper sediment horizons. Despite clear signs of vitality and a strong representation in the foraminiferal community, none of the soft-walled species showed a noticeable response to the offered algal material. We conclude that soft-walled foraminifera may not be important to the short-term phytodetrital matter cycling at the abyssal sea floor.

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More information

Published date: 2011
Keywords: Deep sea, North Pacific, In situ feeding experiment, ?13C, Isotopic labeling, Benthic foraminifera, Carbon remineralization, Soft-walled saccamminid
Organisations: Marine Biogeochemistry

Identifiers

Local EPrints ID: 202781
URI: http://eprints.soton.ac.uk/id/eprint/202781
PURE UUID: fcc6c305-afde-4637-b074-af89f7a78881

Catalogue record

Date deposited: 09 Nov 2011 10:38
Last modified: 18 Jul 2017 11:09

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Contributors

Author: A.J. Enge
Author: H. Nomaki
Author: N.O. Ogawa
Author: U. Witte
Author: M.M. Moeseneder
Author: G Lavik
Author: N Ohkouchi
Author: H Kitazato
Author: M Kučera
Author: P Heinz

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