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| Titel |
Foraminiferal species responses to in situ, experimentally induced anoxia in the Adriatic Sea |
| VerfasserIn |
D. Langlet, C. Baal, E. Geslin, E. Metzger, M. Zuschin, B. Riedel, N. Risgaard-Petersen, M. Stachowitsch, F. J. Jorissen |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 11, no. 7 ; Nr. 11, no. 7 (2014-04-04), S.1775-1797 |
| Datensatznummer |
250117341
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| Publikation (Nr.) |
 copernicus.org/bg-11-1775-2014.pdf |
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| Zusammenfassung |
| Anoxia was successfully induced in four benthic chambers installed at 24 m
depth in the northern Adriatic Sea for periods varying from 9 days to 10
months. During the 10-month period, species richness significantly decreased.
Although no significant change in Shannon diversity and evenness was
observed, the composition of the foraminiferal assemblages changed with time.
This change is due to interspecific differences in tolerance to anoxia.
Reophax nanus, Textularia agglutinans and
Quinqueloculina stelligera all showed a significant
decrease with time, strongly suggesting they are sensitive to anoxia.
Conversely, Eggerella scabra, Bulimina marginata,
Lagenammina atlantica, Hopkinsina pacifica and
Bolivina pseudoplicata appeared to be resistant to the experimental
conditions. Quinqueloculina seminula was apparently sensitive to
anoxia but showed a clear standing stock increase during the first month of
the experiment, which we interpret as an opportunistic response to increasing
organic matter availability due to the degradation of the dead macrofaunal
organisms. None of the anoxia-sensitive species is able to accumulate
intracellular nitrates. Nitrate accumulation could be shown for some tested
specimens of the dominant anoxia-tolerant species E. scabra and
B. marginata. However, tests on the denitrification capacity of
these taxa yielded negative results, suggesting that their resistance to
long-term anoxia is not due to their ability to denitrify. |
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