Nitrogen fixation in Lake Mendota, Madison, Wisconsin1
TL;DR: Despite its small overall contribution to the annual nitrogen budget, N2 fixation is significant in maintaining blue-green algal nuisances in surface water when non-N2-fixing phytoplankton cannot compete effectively.
read more
Abstract: The effects of various environmental conditions, and of cell composition, heterocyst content, and nitrogen content of algal samples, on fixation of N2 by colonial and filamentous algae in Lake Mendota were investigated.
Heterocyst content and temperature were significantly and positively related to acetylene reduction activity (N2 fixation); depth of sample collection was negatively related. Available data do not show whether statistical correlations of acetylene reduction activity with dissolved O2 and pH represent specific effects of O2 and pH on this activity, or simply reflect chemical changes caused by algal photosynthesis.
During summer stratification, when surface-water content of combined inorganic nitrogen was severely depleted, N2 fixation associated with heterocystous blue-green algae contributed 85% of the total N2 fixed. Bacterial N2 fixation was low compared to that of algae. Despite its small overall contribution to the annual nitrogen budget (38,000 kg of nitrogen; ca. 7% of the total input), N2 fixation is significant in maintaining blue-green algal nuisances in surface water when non-N2-fixing phytoplankton cannot compete effectively.
read more
Chat with Paper
AI Agents for this Paper
Find similar papers on Google Scholar, PubMed and Arxiv
Write a critical review of this paper
Analyze citations of this paper to find unaddressed research gaps
Citations
Nitrogen fixation in freshwater, estuarine, and marine ecosystems. 1. Rates and importance1
TL;DR: Nitrogen fixation appears important in making up deficits in nitrogen availability relative to phosphorus availability in many lakes, contributing to the phosphorus-limited status of these systems.
586
Nitrogen fixation in freshwater, estuarine, and marine ecosystems. 2. Biogeochemical controls1
TL;DR: The tendency toward less nitrogen fixation by plankton in estuaries and coastal marine ecosystems than in lakes subject to similar loadings of nitrogen and phosphorus may be due to a lower availability in oxic seawater of one or more trace elements required for nitrogen fixation, such as molybdenum and iron.
441
The role of nitrogen fixation in cyanobacterial bloom toxicity in a temperate, eutrophic lake.
TL;DR: How rapid early summer declines in N followed by bursts of N fixation have shaped cyanobacterial communities in a eutrophic lake (Lake Mendota, Wisconsin, USA), possibly driving toxic Microcystis blooms throughout the growing season is described.
Modeling methane emissions from arctic lakes: Model development and site-level study
TL;DR: In this article, a process-based climate-sensitive lake biogeochemical model was developed to investigate the response of methane emissions from this region to global warming, in which the processes of methane production, oxidation, and transport were modeled within a one-dimensional sediment and water column.
Stratification of aerobic methane‐oxidizing organisms in Lake Mendota, Madison, Wisconsin1
TL;DR: The microflora responsible for methane oxidation are stratified in a narrow band in the thermocline of Lake Mendota where dissolved oxygen is low during summer as mentioned in this paper, which suggests that methanotrophic bacteria co-oxidized ammonia.
119
References
•Book
Standard methods for the examination of water and wastewater
A.E. Greenberg,Lenore S. Clesceri,Andrew D. Eaton +2 more
- 01 Jan 1992
TL;DR: The most widely read reference in the water industry, Water Industry Reference as discussed by the authors, is a comprehensive reference tool for water analysis methods that covers all aspects of USEPA-approved water analysis.
97.9K
•Book
A practical handbook of seawater analysis
J. D. H. Strickland,Timothy R. Parsons +1 more
- 01 Jan 1968
11.8K
•Book
BMD : biomedical computer programs
Wilfrid J. Dixon
- 01 Jan 1965
TL;DR: This book is very referred for you because it gives not only the experience but also lesson, it is about this book that will give wellness for all people from many societies.
2.8K
In situ studies on n2 fixation using the acetylene
Reduction Technique,W. D. P. Stewart,G. P. Fitzgerald,Robert H. Burris +3 more
- 01 Jan 2016
TL;DR: Data obtained in experiments designed to test the feasibility of employing a simple method for measuring acetylene reduction as an index of N2 fixation in the field illustrate that the method is practical and extremely sensitive.
858