Abstract
Results from two regional surveys and multi-lake seasonal studies were used to investigate the variability of phytoplankton photosynthesis and planktonic community respiration in central Amazon floodplain lakes. Hypothesized effects of optical and chemical variables on planktonic photosynthesis and respiration were examined statistically. Changes in dissolved oxygen in light and dark bottles distributed along light-gradients in a shipboard incubator or in situ were used to calculate volumetric community respiration (R c), volumetric gross photosynthesis (P), daily integral gross photosynthesis (Π), and daily integral community respiration rates (Λ). Π varied significantly among all lakes with source-water river stage and source-water river type. Λ also varied significantly with source-water river stage. Variation in maximum depth linked to source-water river stage was a key factor controlling seasonal variations in Π through its influence on total suspended solids and total phosphorus concentrations which affected light extinction and light-saturated photosynthesis, respectively. The predominance of sub-saturated dissolved O2 in the pelagic surface waters of Amazon floodplain lakes was attributed to high integral R c:P ratios, indicating the existence of large sustained inputs of non-phytoplankton organic carbon to these environments.
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Acknowledgements
We thank the Instituto Nacional de Pesquisas da Amazonia (INPA) for cooperation and logistic support, EMBRAPA for providing surface irradiance data, A. Nobre for assistance in the design and construction of the photosynthesis incubator, and S. Souza for assistance in analyzing light data. Support was provided by National Science Foundation Grants DEB-81-11398, BSR-87-06643, BSR-16359 and BSR-87-18423, NASA grant NAGW-1066, IAEA Grant BRA 0/010 and a Fulbright Fellowship (JMM).
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Guest editors: Koen Martens, Sidinei M. Thomaz, Diego Fontaneto & Luigi Naselli-Flores / Emerging Trends in Aquatic Ecology II
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Forsberg, B.R., Melack, J.M., Richey, J.E. et al. Regional and seasonal variability in planktonic photosynthesis and planktonic community respiration in Amazon floodplain lakes. Hydrobiologia 800, 187–206 (2017). https://doi.org/10.1007/s10750-017-3222-3
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DOI: https://doi.org/10.1007/s10750-017-3222-3