Deep-sea bacterial communities in sediments and guts of deposit-feeding holothurians in Portuguese canyons (NE Atlantic)

被引:56
作者
Amaro, Teresa [1 ,2 ,4 ]
Witte, Harry [3 ]
Herndl, Gerhard J. [3 ,5 ]
Cunha, Marina R. [1 ,2 ]
Billett, David S. M. [4 ]
机构
[1] Univ Aveiro, CESAM, P-3810193 Aveiro, Portugal
[2] Univ Aveiro, Dept Biol, P-3810193 Aveiro, Portugal
[3] Royal Netherlands Inst Sea Res, Dept Biol Oceanog, NL-1790 AB Den Burg, Netherlands
[4] Univ Southampton, DEEPSEAS Grp Ocean Biogeochem & Ecosyst, Natl Oceanog Ctr, Southampton SO14 3ZH, Hants, England
[5] Univ Vienna, Vienna Ecol Ctr, Dept Marine Biol, A-1090 Vienna, Austria
关键词
Molpadia musculus; Holothurian; Bacteria; Portuguese Canyons; DGGE; NE Atlantic; GRADIENT GEL-ELECTROPHORESIS; PORCUPINE ABYSSAL-PLAIN; MACROBENTHIC COMMUNITIES; ONEIROPHANTA-MUTABILIS; DIGESTIVE STRATEGIES; IBERIAN MARGIN; ORGANIC-MATTER; NAZARE CANYON; DIVERSITY; BIODIVERSITY;
D O I
10.1016/j.dsr.2009.05.014
中图分类号
P7 [海洋学];
学科分类号
0707 ;
摘要
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.
引用
收藏
页码:1834 / 1843
页数:10
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