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| Titel |
CellTracker Green labelling vs. rose bengal staining: CTG wins by points in distinguishing living from dead anoxia-impacted copepods and nematodes |
| VerfasserIn |
M. Grego, M. Stachowitsch, M. Troch, B. Riedel |
| 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 ; 10, no. 7 ; Nr. 10, no. 7 (2013-07-09), S.4565-4575 |
| Datensatznummer |
250018330
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| Publikation (Nr.) |
 copernicus.org/bg-10-4565-2013.pdf |
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| Zusammenfassung |
| Hypoxia and anoxia have become a key threat to shallow coastal seas. Much is known about their impact on macrofauna, less on
meiofauna. In an attempt to shed more light on the latter group, in particular from a process-oriented view, we experimentally
induced short-term anoxia (1 week) in the northern Adriatic Sea (Mediterranean) and examined the two most abundant
meiofauna taxa – harpacticoid copepods and nematodes. Both taxa also represent different ends of the tolerance spectrum, with
copepods being the most sensitive and nematodes among the most tolerant. We compared two methods: CellTracker Green (CTG) –
new labelling approach for meiofauna – with the traditional rose bengal (RB) staining method. CTG binds to active enzymes and
therefore colours live organisms only. The two methods show considerable differences in the number of living and dead
individuals of both meiofauna taxa. Generally, RB will stain dead but not yet decomposed copepods and nematodes equally as it does live
ones. Specifically, RB significantly overestimated the number of living copepods in all sediment layers in anoxic samples, but
not in any normoxic samples. In contrast, for nematodes, the methods did not show such a clear difference between anoxia and
normoxia. RB overestimated the number of living nematodes in the top sediment layer of normoxic samples, which
implies an overestimation of the overall live nematofauna. For monitoring and biodiversity studies, the RB method might
be sufficient, but for more precise quantification of community degradation, especially after an oxygen depletion event,
CTG labelling is a better tool. Moreover, it clearly highlights the surviving species within the copepod or nematode community.
As already accepted for foraminiferal research, we demonstrate that the CTG
labelling is also valid for other meiofauna groups. |
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