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Title:Structural and functional responses of harpacticoid copepods to anoxia in the Northern Adriatic: an experimental approach
Authors:ID Roelofs, Marleen (Author)
ID De Troch, Marleen (Author)
ID Riedel, Bettina (Author)
ID Grego, Mateja (Author)
Files:URL URL - Presentation file, visit http://www.biogeosciences.net/10/4259/2013/bg-10-4259-2013.html
 
.pdf PDF - Presentation file, download (3,81 MB)
MD5: BD1F0EE0B7621D6FE94DD04F602B1D98
 
URL URL - Source URL, visit https://doi.org/10.5194/bg-10-4259-2013
 
Language:English
Typology:1.01 - Original Scientific Article
Organization:Logo NIB - National Institute of Biology
Abstract:Combined in situ and laboratory studies were conducted to document the effects of anoxia on the structure and functioning of meiobenthic communities, with special focus on harpacticoid copepods. In a first step, anoxia was created artificially by means of an underwater chamber at 24 m depth in the Northern Adriatic, Gulf of Trieste (Mediterranean). Nematodes were found as the most abundant taxon, followed by harpacticoid copepods. While nematode densities were not affected by treatment (anoxia/normoxia) or sediment depth, these factors had a significant impact on copepod abundances. Harpacticoid copepod family diversity, in contrast, was not affected by anoxic conditions, only by depth. Ectinosomatidae and Cletodidae were most abundant in both normoxic and anoxic samples. The functional response of harpacticoid copepods to anoxia was studied in a laboratory tracer experiment by adding 13C pre-labelled diatoms to sediment cores in order to test (1) if there is a difference in food uptake by copepods under normoxic and anoxic conditions and (2) whether initial (normoxia) feeding of harpacticoid copepods on diatoms results in a better survival of copepods in subsequent anoxic conditions. Independent of the addition of diatoms, there was a higher survival rate in normoxia than anoxia. The supply of additional food did not result in a higher survival rate of copepods in anoxia, which might be explained by the presence of a nutritionally better food source and/or a lack of starvation before adding the diatoms. However, there was a reduced grazing pressure by copepods on diatoms in anoxic conditions. This resulted in a modified fatty acid composition of the sediment. We concluded that anoxia not only impacts the survival of consumers (direct effect) but also of primary producers (indirect effect), with important implications for the recovery phase.
Keywords:morje, plankton, kopepodi, živalski plankton, trofični status, morski plankton, harpaktikoidi, anoksije
Publication status:Published
Publication version:Version of Record
Publication date:26.06.2013
Year of publishing:2013
Number of pages:str. 4259-4272
Numbering:Vol. 10, no. 6
PID:20.500.12556/DiRROS-1010 New window
ISSN:1726-4170
UDC:574
DOI:10.5194/bg-10-4259-2013 New window
COBISS.SI-ID:2809679 New window
Publication date in DiRROS:02.08.2024
Views:538
Downloads:365
Metadata:XML DC-XML DC-RDF
:
ROELOFS, Marleen, DE TROCH, Marleen, RIEDEL, Bettina and GREGO, Mateja, 2013, Structural and functional responses of harpacticoid copepods to anoxia in the Northern Adriatic: an experimental approach. [online]. 2013. Vol. 10, no. 6, p. 4259–4272. [Accessed 9 April 2025]. DOI 10.5194/bg-10-4259-2013. Retrieved from: https://dirros.openscience.si/IzpisGradiva.php?lang=eng&id=1010
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Document is financed by a project

Funder:FWF - Austrian Science Fund
Project number:P21542-B17
Name:“Low dissolved oxygen events in the Northern Adriatic: in situ experimental insights into benthic responses before, during and post-anoxia
Funder:Other - Other funder or multiple funders
Project number:01GA1911W
Acronym:BOF-GOA

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