Nitrogen Fixation by Periphyton and Plankton on the Amazon Floodplain at Lake Calado

Nitrogen fixation by periphyton and plankton was measured on the Amazon floodplain using the acetylene reduction method calibrated with 15N-N2. The average ratio (± SD) of moles C2H4 reduced per mole N2-N fixed was 3.4 ± 0.7, similar to other studies. Periphyton and plankton had high rates of light-...

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Published in:Biogeochemistry 1994-02, Vol.26 (1), p.41-66
Main Authors: Doyle, Robert D., Fisher, Thomas R.
Format: Article
Language:English
Subjects:
Alkynes
Animal and plant ecology
Animal, plant and microbial ecology
Biological and medical sciences
Floodplains
Fresh water ecosystems
Freshwater
Fundamental and applied biological sciences. Psychology
Lakes
Macrophytes
Meadows
Nitrogen
Nitrogen fixation
Periphyton
Plankton
Synecology
Watersheds
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container_title Biogeochemistry
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creator Doyle, Robert D.
Fisher, Thomas R.
description Nitrogen fixation by periphyton and plankton was measured on the Amazon floodplain using the acetylene reduction method calibrated with 15N-N2. The average ratio (± SD) of moles C2H4 reduced per mole N2-N fixed was 3.4 ± 0.7, similar to other studies. Periphyton and plankton had high rates of light-dependent nitrogen fixation, with dark nitrogen fixation averaging 26% of the average rates in the light. The average daily (24 h) rates for periphyton nitrogen fixation in 1989 and 1990 were 1.79 and 0.51 mmol N2-N· m-2· d-1 respectively, which are comparable to summer rates in many temperate cyanobacterial assemblages. Nitrogen fixation was depressed at NO3- concentrations as low as 0.5 μM, and was below detection limits at concentrations of 4 μM, which occurred during periods of river flooding. Planktonic nitrogen fixation rates were high (0.5-0.8 mmol N2-N· m2· d-1) during the high-water and drainage phases of the annual hydrograph when the floodplain waters were draining towards the river (low NO3-), but rates were undetectable $(
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The average ratio (± SD) of moles C2H4 reduced per mole N2-N fixed was 3.4 ± 0.7, similar to other studies. Periphyton and plankton had high rates of light-dependent nitrogen fixation, with dark nitrogen fixation averaging 26% of the average rates in the light. The average daily (24 h) rates for periphyton nitrogen fixation in 1989 and 1990 were 1.79 and 0.51 mmol N2-N· m-2· d-1 respectively, which are comparable to summer rates in many temperate cyanobacterial assemblages. Nitrogen fixation was depressed at NO3- concentrations as low as 0.5 μM, and was below detection limits at concentrations of 4 μM, which occurred during periods of river flooding. Planktonic nitrogen fixation rates were high (0.5-0.8 mmol N2-N· m2· d-1) during the high-water and drainage phases of the annual hydrograph when the floodplain waters were draining towards the river (low NO3-), but rates were undetectable $(&lt;0.05\ \text{mmol N}_{2}-\text{N}\cdot \text{m}^{2}\cdot \text{d}^{-1})$ when there was river flooding (high NO3-). 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The average ratio (± SD) of moles C2H4 reduced per mole N2-N fixed was 3.4 ± 0.7, similar to other studies. Periphyton and plankton had high rates of light-dependent nitrogen fixation, with dark nitrogen fixation averaging 26% of the average rates in the light. The average daily (24 h) rates for periphyton nitrogen fixation in 1989 and 1990 were 1.79 and 0.51 mmol N2-N· m-2· d-1 respectively, which are comparable to summer rates in many temperate cyanobacterial assemblages. Nitrogen fixation was depressed at NO3- concentrations as low as 0.5 μM, and was below detection limits at concentrations of 4 μM, which occurred during periods of river flooding. Planktonic nitrogen fixation rates were high (0.5-0.8 mmol N2-N· m2· d-1) during the high-water and drainage phases of the annual hydrograph when the floodplain waters were draining towards the river (low NO3-), but rates were undetectable $(&lt;0.05\ \text{mmol N}_{2}-\text{N}\cdot \text{m}^{2}\cdot \text{d}^{-1})$ when there was river flooding (high NO3-). Nitrogen fixation by periphyton and plankton in 1989-1990 accounted for approximately 8% of previously reported total annual nitrogen inputs to the floodplain at Lake Calado.</description><subject>Alkynes</subject><subject>Animal and plant ecology</subject><subject>Animal, plant and microbial ecology</subject><subject>Biological and medical sciences</subject><subject>Floodplains</subject><subject>Fresh water ecosystems</subject><subject>Freshwater</subject><subject>Fundamental and applied biological sciences. 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Psychology</topic><topic>Lakes</topic><topic>Macrophytes</topic><topic>Meadows</topic><topic>Nitrogen</topic><topic>Nitrogen fixation</topic><topic>Periphyton</topic><topic>Plankton</topic><topic>Synecology</topic><topic>Watersheds</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Doyle, Robert D.</creatorcontrib><creatorcontrib>Fisher, Thomas R.</creatorcontrib><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>Water Resources Abstracts</collection><collection>Environmental Sciences and Pollution Management</collection><collection>ASFA: Aquatic Sciences and Fisheries Abstracts</collection><collection>Aquatic Science &amp; Fisheries Abstracts (ASFA) 2: Ocean Technology, Policy &amp; Non-Living Resources</collection><collection>Aquatic Science &amp; Fisheries Abstracts (ASFA) 3: Aquatic Pollution &amp; Environmental Quality</collection><collection>Aquatic Science &amp; Fisheries Abstracts (ASFA) Professional</collection><jtitle>Biogeochemistry</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Doyle, Robert D.</au><au>Fisher, Thomas R.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Nitrogen Fixation by Periphyton and Plankton on the Amazon Floodplain at Lake Calado</atitle><jtitle>Biogeochemistry</jtitle><date>1994-02</date><risdate>1994</risdate><volume>26</volume><issue>1</issue><spage>41</spage><epage>66</epage><pages>41-66</pages><issn>0168-2563</issn><eissn>1573-515X</eissn><coden>BIOGEP</coden><abstract>Nitrogen fixation by periphyton and plankton was measured on the Amazon floodplain using the acetylene reduction method calibrated with 15N-N2. The average ratio (± SD) of moles C2H4 reduced per mole N2-N fixed was 3.4 ± 0.7, similar to other studies. Periphyton and plankton had high rates of light-dependent nitrogen fixation, with dark nitrogen fixation averaging 26% of the average rates in the light. The average daily (24 h) rates for periphyton nitrogen fixation in 1989 and 1990 were 1.79 and 0.51 mmol N2-N· m-2· d-1 respectively, which are comparable to summer rates in many temperate cyanobacterial assemblages. Nitrogen fixation was depressed at NO3- concentrations as low as 0.5 μM, and was below detection limits at concentrations of 4 μM, which occurred during periods of river flooding. 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source JSTOR Archival Journals and Primary Sources Collection; Springer LINK Archives
subjects Alkynes
Animal and plant ecology
Animal, plant and microbial ecology
Biological and medical sciences
Floodplains
Fresh water ecosystems
Freshwater
Fundamental and applied biological sciences. Psychology
Lakes
Macrophytes
Meadows
Nitrogen
Nitrogen fixation
Periphyton
Plankton
Synecology
Watersheds
title Nitrogen Fixation by Periphyton and Plankton on the Amazon Floodplain at Lake Calado
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