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Title:The depleted carbon isotopic signature of nematodes and harpacticoids and their place in carbon processing in fish farm sediments
Authors:ID Grego, Mateja (Author)
ID Malej, Alenka (Author)
ID De Troch, Marleen (Author)
Files:URL URL - Source URL, visit https://www.frontiersin.org/articles/10.3389/fmars.2020.00572/full
 
.pdf PDF - Presentation file, download (12,60 MB)
MD5: EB4131F51C3C4D98E4EAD30A63218DF4
 
Language:English
Typology:1.01 - Original Scientific Article
Organization:Logo NIB - National Institute of Biology
Abstract:Fish farm-originating organic matter can modify the ecological processes in a benthic ecosystem. This was investigated in the sediments of the northern Adriatic Sea by measuring δ13C signature of nematodes, harpacticoids, and sedimentary organic matter, and by assessing pore water nutrients and bacterial composition. In a mesocosm experiment, 13C-labeled diatoms were added on top of sediment cores and 13C enrichment was measured as a proxy of diatom uptake by meiofauna. The δ13C signatures were depleted under fish farming cages compared to the reference site, as observed for sedimentary organic matter (−24.4‰ vs. −21.8‰), for nematodes (−22.5‰ vs. −17.7‰), and for harpacticoids (−25.3‰ vs. −20.8‰). The direct consumption of fish feed (−22.2‰) was not traced in meiofauna taxa. Nematodes from the farm site likely reflect a diet comprising sedimentary organic matter, as they were enriched by 2‰ relative to the sedimentary organic matter. The nematodes from the reference site were enriched by 4.2‰ relative to the sedimentary organic matter, which implies that they rely on more enriched food sources, like diatoms, which was confirmed by their uptake of 13C-labeled diatoms. The nematode assemblage incorporated more diatom 13C than harpacticoids, making them more important players in the carbon flux from diatoms to higher trophic levels at the reference site. Harpacticoids from the reference site were enriched by 1.1‰ compared to sedimentary organic matter, implying that this was their primary food source. Harpacticoids from the farm site were depleted by 0.9‰ relative to the sedimentary organic matter, indicating they were influenced by a very depleted food source like bacteria. Harpacticoids from both the cage and reference sites consumed 13C-labeled diatoms, which implies their diet might span a broad δ13C range, from bacteria to diatoms. Pore water nutrients with high dissolved inorganic carbon, phosphate, and ammonium concentration indicated an elevated microbial degradation of organic compounds under the fish farm. The denaturing gradient gel electrophoresis analysis showed a 70% similarity between sediment bacteria communities from the fish farm and reference site. The study demonstrated that fish farm-originating organic matter enters the meiofauna food chain, and that nematodes and harpacticoids use different food sources under the fish farm and at the reference site.
Publication status:Published
Publication version:Version of Record
Publication date:28.07.2020
Year of publishing:2020
Number of pages:str. 1-15
Numbering:Vol. 7, article 572
PID:20.500.12556/DiRROS-19521 New window
UDC:574.6
ISSN on article:2296-7745
DOI:10.3389/fmars.2020.00572 New window
COBISS.SI-ID:24147971 New window
Note:Nasl. z nasl. zaslona; Opis vira z dne 31. 7. 2020;
Publication date in DiRROS:22.07.2024
Views:424
Downloads:266
Metadata:XML DC-XML DC-RDF
:
GREGO, Mateja, MALEJ, Alenka and DE TROCH, Marleen, 2020, The depleted carbon isotopic signature of nematodes and harpacticoids and their place in carbon processing in fish farm sediments. Frontiers in marine science [online]. 2020. Vol. 7, no. 572, p. 1–15. [Accessed 8 April 2025]. DOI 10.3389/fmars.2020.00572. Retrieved from: https://dirros.openscience.si/IzpisGradiva.php?lang=eng&id=19521
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Record is a part of a journal

Title:Frontiers in marine science
Shortened title:Front. mar. sci.
Publisher:Frontiers Media S.A.
ISSN:2296-7745
COBISS.SI-ID:523094809 New window

Document is financed by a project

Funder:ARIS - Slovenian Research and Innovation Agency
Project number:P1-0237-2020
Name:Raziskave obalnega morja
Funder:EC - European Commission
Funding programme:European 6th Framework Programme
Project number:006540
Name:Ecosystem Approach for Sustainable Aquaculture
Acronym:ECASA

Licences

License:CC BY 4.0, Creative Commons Attribution 4.0 International
Link:http://creativecommons.org/licenses/by/4.0/
Description:This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.

Secondary language

Language:Slovenian
Keywords:hidrobiologija, ribogojnice, usedline, ogljik


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