globalchange  > 影响、适应和脆弱性
DOI: 10.1111/gcb.13779
论文题名:
Imbalanced nutrient recycling in a warmer ocean driven by differential response of extracellular enzymatic activities
作者: Ayo B.; Abad N.; Artolozaga I.; Azua I.; Baña Z.; Unanue M.; Gasol J.M.; Duarte C.M.; Iriberri J.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2017
卷: 23, 期:10
起始页码: 4084
结束页码: 4093
语种: 英语
英文关键词: alkaline phosphatase ; C:N:P molar ratio ; extracellular enzymatic activity ; global warming ; leucine aminopeptidase ; subtropical and tropical ocean ; temperature-sensitivity ; β-glucosidase
英文摘要: Ocean oligotrophication concurrent with warming weakens the capacity of marine primary producers to support marine food webs and act as a CO2 sink, and is believed to result from reduced nutrient inputs associated to the stabilization of the thermocline. However, nutrient supply in the oligotrophic ocean is largely dependent on the recycling of organic matter. This involves hydrolytic processes catalyzed by extracellular enzymes released by bacteria, which temperature dependence has not yet been evaluated. Here, we report a global assessment of the temperature-sensitivity, as represented by the activation energies (Ea), of extracellular β-glucosidase (βG), leucine aminopeptidase (LAP) and alkaline phosphatase (AP) enzymatic activities, which enable the uptake by bacteria of substrates rich in carbon, nitrogen, and phosphorus, respectively. These Ea were calculated from two different approaches, temperature experimental manipulations and a space-for-time substitution approach, which generated congruent results. The three activities showed contrasting Ea in the subtropical and tropical ocean, with βG increasing the fastest with warming, followed by LAP, while AP showed the smallest increase. The estimated activation energies predict that the hydrolysis products under projected warming scenarios will have higher C:N, C:P and N:P molar ratios than those currently generated, and suggest that the warming of oceanic surface waters leads to a decline in the nutrient supply to the microbial heterotrophic community relative to that of carbon, particularly so for phosphorus, slowing down nutrient recycling and contributing to further ocean oligotrophication. © 2017 John Wiley & Sons Ltd
资助项目: This is a contribution to the MALASPINA Expedition 2010 project, funded by the CONSOLIDER-Ingenio 2010 program from the Spanish Ministry of Economy and Competitiveness (Ref. CSD2008-00077). NA was supported by a grant from the Basque Government (Ref. BFI-2010-130). We thank one anonymous reviewer for helpful comments on an earlier version of this manuscript. We thank the participants in the Malaspina Expedition and the crew of BIO Hespérides and the personnel of the Marine Technology Unit of CSIC (UTM) for their invaluable support.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60772
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作者单位: Department of Immunology, Microbiology and Parasitology, Faculty of Science and Technology, University of the Basque Country UPV/EHU, Leioa-Bizkaia, Spain; Research Centre for Experimental Marine Biology and Biotechnology PiE-UPV/EHU, Plentzia-Bizkaia, Spain; Institut de Ciències del Mar, CSIC, Barcelona, Spain; Department of Global Change Research, Instituto Mediterráneo de Estudios Avanzados (CSIC-UIB), Esporles, Spain; Biological and Environmental Science & Engineering Division, Red Sea Research Center (RSRC), King Abdullah University of Science and Technology (KAUST), Thuwal, Saudi Arabia

Recommended Citation:
Ayo B.,Abad N.,Artolozaga I.,et al. Imbalanced nutrient recycling in a warmer ocean driven by differential response of extracellular enzymatic activities[J]. Global Change Biology,2017-01-01,23(10)
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