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Microcalorimetry of the smallest plankton fraction: in search for the sources of heat dissipation IBSS Repository
Mukhanov, V. S.; Kemp, R. B..
Heat production by the plankton pico (0.2 to 2 μm) and femto (<0.2 μm) fractions was measured in the dark using a microcalorimetric method. It was surprisingly found that the femtofraction (FF) produced more heat per seawater volume (48 ± 24 (95% CI) μW l-1) than the picofraction (25 ± 14 μW l-1). Consequently, we tested two hypotheses which could explain the phenomenon through a differentiation between the potential sources of heat in FF: (i) metabolism of ultramicrobacteria, the only living component in the fraction besides the non-metabolizing virioplankton which are unable to produce heat; (ii) extracellular chemical processes in aquatic environments. Results of microcalorimetry and respirometry combined with the use of antimicrobial agents...
Tipo: Journal Contribution Palavras-chave: Microcalorimetry; Heat production; Ultramicrobacteria; Virioplankton; Bacterioplankton; Extracellular enzyme activity; Микрокалориметрия; Теплопродукция; Ультрамикробактерии; Вириопланктон; Бактериопланктон; Внеклеточная ферментативная активность.
Ano: 2005 URL: http://repository.ibss.org.ua/dspace/handle/99011/234
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Nutrient scarcity strengthens soil fauna control over leaf litter decomposition in tropical rainforests ArchiMer
Peguero, Guille; Sardans, Jordi; Asensio, Dolores; Fernández-martínez, Marcos; Gargallo-garriga, Albert; Grau, Oriol; Llusià, Joan; Margalef, Olga; Márquez, Laura; Ogaya, Romà; Urbina, Ifigenia; Courtois, Elodie A.; Stahl, Clément; Van Langenhove, Leandro; Verryckt, Lore T.; Richter, Andreas; Janssens, Ivan A.; Peñuelas, Josep.
Soil fauna is a key control of the decomposition rate of leaf litter, yet its interactions with litter quality and the soil environment remain elusive. We conducted a litter decomposition experiment across different topographic levels within the landscape replicated in two rainforest sites providing natural gradients in soil fertility to test the hypothesis that low nutrient availability in litter and soil increases the strength of fauna control over litter decomposition. We crossed these data with a large dataset of 44 variables characterizing the biotic and abiotic microenvironment of each sampling point and found that microbe-driven carbon (C) and nitrogen (N) losses from leaf litter were 10.1 and 17.9% lower, respectively, in the nutrient-poorest site,...
Tipo: Text Palavras-chave: Biogeochemistry; Extracellular enzyme activity; Litter decomposition; Nutrients; Soil fauna.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00513/62424/69469.pdf
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