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| Titel |
Meiofauna winners and losers of coastal hypoxia: case study harpacticoid copepods |
| VerfasserIn |
M. Grego, B. Riedel, M. Stachowitsch, M. De Troch |
| 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. 2 ; Nr. 11, no. 2 (2014-01-22), S.281-292 |
| Datensatznummer |
250117142
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| Publikation (Nr.) |
 copernicus.org/bg-11-281-2014.pdf |
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| Zusammenfassung |
| The impact of anoxia on meiobenthic copepod species was assessed by means of
a field experiment. Four plexiglass chambers were deployed in situ in 24 m depth to
simulate an anoxic event of 9 days, 1 month, 2 months and 10 months. From
normoxic to anoxic conditions, we recorded a drop in copepod density and
species richness. With increasing duration of anoxia the relative abundance
of the individuals of the family Cletodidae increased, and they survived the
1 month and 2 month anoxia, the latter with few specimens. They were the
true "winners" of the experimentally induced anoxia. Dominance did not
increase in the deployments because not one, but several species from this
family were tolerant to anoxia. The overall rate of survival was the same
for males and females, but no juvenile stages of copepods survived in
anoxia. During a recovery phase of 7 days after a short-term anoxia of 9
days, harpacticoid copepod density did not increase significantly, and there
was only a slight increase in species diversity. We concluded that no
substantial colonisation from the surrounding sediment took place. The
survivors, however, showed a high potential for recovery according to the
number of gravid females, whose number increased significantly once the
oxygen was available again. These findings imply that substantial energy is
allocated to reproduction in the recovery phase. |
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