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Marine Ecology Progress Series

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MEPS 406:121-133 (2010)  -  DOI:

Preferred use of bacteria over phytoplankton by deep-sea nematodes in polar regions

Jeroen Ingels1,*, Pieter Van den Driessche1, Ilse De Mesel2, Sandra Vanhove3, Tom Moens1, Ann Vanreusel1

1Marine Biology Department, Ghent University, Krijgslaan 281 S8, 9000 Ghent, Belgium
2Institute for Marine Resources & Ecosystem Studies, PO Box 77, 4400 AB Yerseke, The Netherlands
3The International Polar Foundation, Tweestationstraat 120A, Brussels 1070, Belgium

ABSTRACT: The present study explored the selective feeding properties of Antarctic and Arctic deep-sea nematodes within an experimental setup. Nematodes are assumed to play an important role in the carbon flux within the polar bathyal food webs, but knowledge about their natural diets is limited. For the first time, deep-sea multicore sediment samples from both polar regions were incubated aboard research vessels with either 13C-labelled bacteria or diatoms to determine whether the nematode community prefers freshly settled phytodetritus to a bacterial food source. The cores were collected at 2112 to 2400 m water depth and incubated onboard for 1, 3 and 6 d in the Arctic (Hausgarten) and for 1, 7 and 14 d in Antarctica (Kapp Norvegia). Natural carbon isotope signals of nematodes and organic sedimentary carbon showed a clear average offset (+3.2‰). The contribution of bacteria to the diet of nematodes explained this 13C offset and observed natural 13C isotopic signatures. The nematodes showed a clear, relatively rapid (maximum at 6 to 7 d) and significant selective response to the pulse of 13C enriched bacteria in surface sediments of both regions. This indicated that bacteria were preferred over fresh phytoplankton as a carbon source for both Arctic and Antarctic deep-sea nematode communities. The results also suggest that bacteria may provide a path through which unused detritus may enter the traditional metazoan food web by microbial reworking of organic matter. At the same time, uptake rates of nematode communities were minimal, which suggests the contribution of nematodes to benthic mineralisation of freshly deposited organic matter may be limited in deep polar seas.

KEY WORDS: Deep-sea nematodes · Bacteria · Phytoplankton · Polar regions

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Cite this article as: Ingels J, Van den Driessche P, De Mesel I, Vanhove S, Moens T, Vanreusel A (2010) Preferred use of bacteria over phytoplankton by deep-sea nematodes in polar regions. Mar Ecol Prog Ser 406:121-133.

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