Carbon and Nitrogen Uptake of Calcareous Benthic Foraminifera along a Depth-Related Oxygen Gradient in the OMZ of the Arabian Sea

Frontiers in Microbiology
Annekatrin J EngePetra Heinz

Abstract

Foraminifera are an important faunal element of the benthos in oxygen-depleted settings such as Oxygen Minimum Zones (OMZs) where they can play a relevant role in the processing of phytodetritus. We investigated the uptake of phytodetritus (labeled with (13)C and (15)N) by calcareous foraminifera in the 0-1 cm sediment horizon under different oxygen concentrations within the OMZ in the eastern Arabian Sea. The in situ tracer experiments were carried out along a depth transect on the Indian margin over a period of 4 to 10 days. The uptake of phytodetrital carbon within 4 days by all investigated species shows that phytodetritus is a relevant food source for foraminifera in OMZ sediments. The decrease of total carbon uptake from 540 to 1100 m suggests a higher demand for carbon by species in the low-oxygen core region of the OMZ or less food competition with macrofauna. Especially Uvigerinids showed high uptake of phytodetrital carbon at the lowest oxygenated site. Variation in the ratio of phytodetrital carbon to nitrogen between species and sites indicates that foraminiferal carbon and nitrogen use can be decoupled and different nutritional demands are found between species. Lower ratio of phytodetrital carbon and nitrogen at 5...Continue Reading

References

Sep 8, 2006·Nature·Nils Risgaard-PetersenGijsbert J van der Zwaan
May 3, 2008·Science·Lothar StrammaVolker Mohrholz
Aug 16, 2008·Science·Robert J Diaz, Rutger Rosenberg
Jan 19, 2010·Proceedings of the National Academy of Sciences of the United States of America·Elisa Piña-OchoaNils Risgaard-Petersen
Dec 3, 2011·The ISME Journal·Joan M BernhardDavid J Beaudoin

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Citations

Dec 22, 2020·Frontiers in Microbiology·Clare BirdJennifer S Fehrenbacher

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