Temporal patterns of primary production in a large ultra-oligotrophic Antarctic freshwater lake

Polar Biology ◽  
1997 ◽  
Vol 18 (6) ◽  
pp. 363-370 ◽  
Author(s):  
Peter Bayliss ◽  
J. Cynan Ellis-Evans ◽  
Johanna Laybourn-Parry
Keyword(s):  
Primary Production ◽  
Temporal Patterns ◽  
Freshwater Lake ◽  
Antarctic Freshwater Lake

scholarly journals Photoheterotrophy by aerobic anoxygenic bacteria modulates carbon fluxes in a freshwater lake

2021 ◽  
Author(s):  
Kasia Piwosz ◽  
Cristian Villena-Alemany ◽  
Izabela Mujakić
Keyword(s):  
Primary Production ◽  
Net Primary Production ◽  
Carbon Fluxes ◽  
Photochemical Reactions ◽  
Freshwater Lake ◽  
Infrared Light ◽  
Community Respiration ◽  
New Paradigm ◽  
Heterotrophic Microorganisms ◽  
Global Carbon

AbstractLakes are a significant component of the global carbon cycle. Respiration exceeds net primary production in most freshwater lakes, making them a source of CO2 to the atmosphere. Driven by heterotrophic microorganisms, respiration is assumed to be unaffected by light, thus it is measured in the dark. However, photoheterotrophs, such as aerobic anoxygenic photoheterotrophic (AAP) bacteria that produce ATP via photochemical reactions, substantially reduce respiration in the light. They are an abundant and active component of bacterioplankton, but their photoheterotrophic contribution to microbial community metabolism remains unquantified. We showed that the community respiration rate in a freshwater lake was reduced by 15.2% (95% confidence interval (CI): 6.6–23.8%) in infrared light that is usable by AAP bacteria but not by primary producers. Moreover, significantly higher assimilation rates of glucose (18.1%; 7.8–28.4%), pyruvate (9.5%; 4.2–14.8%), and leucine (5.9%; 0.1–11.6%) were measured in infrared light. At the ecosystem scale, the amount of CO2 from respiration unbalanced by net primary production was by 3.69 × 109 g CO2 lower over these two sampling seasons when measured in the infrared light. Our results demonstrate that dark measurements of microbial activity significantly bias the carbon fluxes, providing a new paradigm for their quantification in aquatic environments.

Spatial-temporal patterns of net primary production in Anji (China) between 1984 and 2014

2020 ◽  
Vol 110 ◽  
pp. 105954 ◽  
Author(s):  
Shulin Chen ◽  
Hong Jiang ◽  
Yan Chen ◽  
Zhijian Cai
Keyword(s):  
Primary Production ◽  
Net Primary Production ◽  
Temporal Patterns

scholarly journals Spatial and temporal patterns of herbaceous primary production in semi-arid shrublands: a remote sensing approach

2016 ◽  
Vol 27 (4) ◽  
pp. 716-727 ◽  
Author(s):  
Lisandro J. Blanco ◽  
José M. Paruelo ◽  
Martín Oesterheld ◽  
Fernando N. Biurrun
Keyword(s):  
Remote Sensing ◽  
Primary Production ◽  
Temporal Patterns ◽  
Spatial And Temporal Patterns ◽  
Arid Shrublands ◽  
Semi Arid
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