Trophic interactions of fish communities at midwater depths enhance long-term carbon storage and benthic production on continental slopes

Type Article
Date 2014-07
Language English
Author(s) Trueman C. N.1, Johnston G.2, 3, O'Hea B.2, 3, Mackenzie KirsteenORCID1
Affiliation(s) 1 : Univ Southampton, Natl Oceanog Ctr, Southampton S014 3ZH, Hants, England.
2 : Inst Marine, Rinville, Ireland.
3 : Oranmore Co, Galway, Ireland.
Source Proceedings Of The Royal Society B-biological Sciences (0962-8452) (Royal Soc), 2014-07 , Vol. 281 , N. 1787 , P. 10p.)
DOI 10.1098/rspb.2014.0669
WOS© Times Cited 77
Keyword(s) benthic-pelagic coupling, food web, North Atlantic, carbon, nitrogen, mesopelagic
Abstract Biological transfer of nutrients and materials between linked ecosystems influences global carbon budgets and ecosystem structure and function. Identifying the organisms or functional groups that are responsible for nutrient transfer, and quantifying their influence on ecosystem structure and carbon capture is an essential step for informed management of ecosystems in physically distant, but ecologically linked areas. Here, we combine natural abundance stable isotope tracers and survey data to show that mid-water and bentho-pelagic-feeding demersal fishes play an important role in the ocean carbon cycle, bypassing the detrital particle flux and transferring carbon to deep long-term storage. Global peaks in biomass and diversity of fishes at mid-slope depths are explained by competitive release of the demersal fish predators of mid-water organisms, which in turn support benthic fish production. Over 50% of the biomass of the demersal fish community at depths between 500 and 1800 m is supported by biological rather than detrital nutrient flux processes, and we estimate that bentho-pelagic fishes from the UK-Irish continental slope capture and store a volume of carbon equivalent to over 1 million tonnes of CO2 every year.
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Trueman C. N., Johnston G., O'Hea B., Mackenzie Kirsteen (2014). Trophic interactions of fish communities at midwater depths enhance long-term carbon storage and benthic production on continental slopes. Proceedings Of The Royal Society B-biological Sciences, 281(1787), 10p.). Publisher's official version : https://doi.org/10.1098/rspb.2014.0669 , Open Access version : https://archimer.ifremer.fr/doc/00737/84940/