Evidence of nitrification and denitrification in high and low microbial abundance sponges

Marie Lise Schläppy, Sandra I. Schöttner, Gaute Lavik, Marcel M.M. Kuypers, Dirk de Beer, Friederike Hoffmann

Research output: Contribution to journalArticle

83 Citations (Scopus)

Abstract

Aerobic and anaerobic microbial key processes were quantified and compared to microbial numbers and morphological structure in Mediterranean sponges. Direct counts on histological sections stained with DAPI showed that sponges with high microbial abundances (HMA sponges) have a denser morphological structure with a reduced aquiferous system compared to low microbial abundance (LMA) sponges. In Dysidea avara, the LMA sponge, rates of nitrification and denitrification were higher than in the HMA sponge Chondrosia reniformis, while anaerobic ammonium oxidation and sulfate reduction were below detection in both species. This study shows that LMA sponges may host physiologically similar microbes with comparable or even higher metabolic rates than HMA sponges, and that anaerobic processes such as denitrification can be found both in HMA and LMA sponges. A higher concentration of microorganisms in the mesohyl of HMA compared to LMA sponges may indicate a stronger retention of and, hence, a possible benefit from associated microbes.

Original languageEnglish
Pages (from-to)593-602
Number of pages10
JournalMarine Biology
Volume157
Issue number3
DOIs
Publication statusPublished - Feb 2010
Externally publishedYes

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