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 Deep-sea bacterial communities in sediments and guts of deposit-feeding holothurians in Portuguese canyons (NE Atlantic)
Please use this identifier to cite or link to this item http://hdl.handle.net/10773/6461

title: Deep-sea bacterial communities in sediments and guts of deposit-feeding holothurians in Portuguese canyons (NE Atlantic)
authors: Amaro, T
Witte, H
Herndl, GJ
Cunha, MR
Billett, DSM
keywords: Molpadia musculus; NE Atlantic
Holothurian
Bacteria
Portuguese Canyons
DGGE
NE Atlantic
issue date: 2-Jun-2009
publisher: Elsevier
abstract: Deposit-feeding holothurians often dominate the megafauna in bathyal deep-sea settings, in terms of both abundance and biomass. Molpadia musculus is particularly abundant at about 3400 m depth in the Nazare Canyon on the NE Atlantic Continental Margin. However, these high abundances are unusual for burrowing species at this depth. The objective of this research was to understand the reasons of the massive occurrence of these molpadiid holothurians in the Nazare Canyon. To address this question we investigated possible trophic interactions with bacteria at sites where the organic content of the sediment was different (Setubal and Cascais Canyons, NE Atlantic Continental Margin). The molecular fingerprinting technique of Denaturing Gradient Gel Electrophoresis (DGGE) with band sequencing, combined with non-metric multidimensional scaling and statistical analyses, was used to compare the bacterial community diversity in canyon sediments and holothurian gut contents. Our results suggest that M. musculus does not need to develop a specialised gut bacterial community to aid digestion where the sediment is rich in organic matter (Nazare Canyon); in contrast, such a community may be developed where the sediment is poorer in organic matter (Cascais Canyon). (C) 2009 Elsevier Ltd. All rights reserved.
URI: http://hdl.handle.net/10773/6461
ISSN: 0967-0637
publisher version/DOI: http://dx.doi.org/10.1016/j.dsr.2009.05.014
source: Deep Sea Research Part I: Oceanographic Research Papers
appears in collectionsCESAM - Artigos
BIO - Artigos
PT Mar - Artigos

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