Uptake-release dynamics of the inorganic and organic carbon pool mediated by planktonic prokaryotes in the deep Mediterranean Sea

被引:11
作者
Celussi, Mauro [1 ]
Malfatti, Francesca [1 ]
Ziveri, Patrizia [2 ,3 ]
Giani, Michele [1 ]
Del Negro, Paola [1 ]
机构
[1] OGS Ist Nazl Oceanog & Geofis Sperimentale, Div Oceanog, Via A Piccard 54, I-34151 Trieste, Italy
[2] Autonomous Univ Barcelona UAB, Inst Environm Sci & Technol, Bellaterra 08193, Spain
[3] ICREA, Pg Lluis Companys 23, Barcelona 08010, Spain
关键词
BATHYPELAGIC WATERS; MAJOR CONTRIBUTION; EASTERN; OCEAN; MICROBES; BACTERIA; VIRUSES; RESPIRATION; ASSEMBLAGES; METABOLISM;
D O I
10.1111/1462-2920.13641
中图分类号
Q93 [微生物学];
学科分类号
071005 ; 100705 ;
摘要
Understanding the ecosystem functioning in the dark portion of the ocean is a challenge that microbial ecologists are still facing. Due to the large volume, the global deep Ocean plays a central role in the regulation of climate, possibly buffering the rise of atmospheric carbon dioxide if processes of CO2 fixation compensate for respiration. We investigated the rates of several prokaryotic activities (dissolved and particulate primary production, heterotrophic carbon production and respiration) in meso- and bathypelagic waters of the Mediterranean Sea, covering all sub-basins. Chemosynthesis was the main process for C uptake. The rates of organic C (OC) excretion (or viral-induced cell lysis) inferred from the dissolved primary production measurements were noteworthy, being comparable to particulate primary production, and possibly contributing to the formation of non-sinking particulate organic matter. Inorganic C fixation rates were significantly higher than those reported for other deep-sea systems, probably as a consequence of the persistently higher temperature of dark Mediterranean waters or to phylogenetically diverse communities involved in the process. Primary production was negatively correlated with dissolved organic carbon concentration and showed an inverse pattern to heterotrophic carbon production, indicating a niche partitioning between heterotrophs and autotrophs. In sum, the deep Mediterranean Sea harbors active autotrophic communities able to fix inorganic carbon faster than the heterotrophic carbon production rates.
引用
收藏
页码:1163 / 1175
页数:13
相关论文
共 69 条
[1]  
[Anonymous], 2010, ADV OCEANOGR LIMNOL, DOI DOI 10.4081/AIOL.2010.5298
[2]   Active mesopelagic prokaryotes support high respiration in the subtropical northeast Atlantic Ocean -: art. no. L03608 [J].
Arístegui, J ;
Duarte, CM ;
Gasol, JM ;
Alonso-Sáez, L .
GEOPHYSICAL RESEARCH LETTERS, 2005, 32 (03) :1-4
[3]   Microbial oceanography of the dark ocean's pelagic realm [J].
Aristegui, Javier ;
Gasol, Josep M. ;
Duarte, Carlos M. ;
Herndl, Gerhard J. .
LIMNOLOGY AND OCEANOGRAPHY, 2009, 54 (05) :1501-1529
[4]   Dilution limits dissolved organic carbon utilization in the deep ocean [J].
Arrieta, Jesus M. ;
Mayol, Eva ;
Hansman, Roberta L. ;
Herndl, Gerhard J. ;
Dittmar, Thorsten ;
Duarte, Carlos M. .
SCIENCE, 2015, 348 (6232) :331-333
[5]   Coccolith Sr/Ca ratios in the eastern Mediterranean: Production versus export processes [J].
Auliaherliaty, L. ;
Stoll, H. M. ;
Ziveri, P. ;
Malinverno, E. ;
Triantaphyllou, M. ;
Stravrakakis, S. ;
Lykousis, V. .
MARINE MICROPALEONTOLOGY, 2009, 73 (3-4) :196-206
[6]   Prokaryotic dynamics and heterotrophic metabolism in a deep convection site of Eastern Mediterranean Sea (the Southern Adriatic Pit) [J].
Azzaro, M. ;
La Ferla, R. ;
Maimone, G. ;
Monticelli, L. S. ;
Zaccone, R. ;
Civitarese, G. .
CONTINENTAL SHELF RESEARCH, 2012, 44 :106-118
[7]   Prokaryotic carbon utilization in the dark ocean: growth efficiency, leucine-to-carbon conversion factors, and their relation [J].
Baltar, Federico ;
Aristegui, Javier ;
Gasol, Josep M. ;
Herndl, Gerhard J. .
AQUATIC MICROBIAL ECOLOGY, 2010, 60 (03) :227-232
[8]   Significance of non-sinking particulate organic carbon and dark CO2 fixation to heterotrophic carbon demand in the mesopelagic northeast Atlantic [J].
Baltar, Federico ;
Aristegui, Javier ;
Sintes, Eva ;
Gasol, Josep M. ;
Reinthaler, Thomas ;
Herndl, Gerhard J. .
GEOPHYSICAL RESEARCH LETTERS, 2010, 37
[9]   Evidence of prokaryotic metabolism on suspended particulate organic matter in the dark waters of the subtropical North Atlantic [J].
Baltar, Federico ;
Aristegui, Javier ;
Gasol, Josep M. ;
Sintes, Eva ;
Herndl, Gerhard J. .
LIMNOLOGY AND OCEANOGRAPHY, 2009, 54 (01) :182-193
[10]   The Size-Reactivity Continuum of Major Bioelements in the Ocean [J].
Benner, Ronald ;
Amon, Rainer M. W. .
ANNUAL REVIEW OF MARINE SCIENCE, VOL 7, 2015, 7 :185-205