Nitrogen fixation in Lake Mendota, Madison, Wisconsin1
نویسندگان
چکیده
منابع مشابه
Diel variation of nitrogen fixation in Lake Valencia, Venezuela’
During 198 1 we examined the diel variations of nitrogen fixation in Lake Valencia, Venezuela. Four species of heterocyst-bearing blue-green algae were common but subdominant in the phytoplankton. In samples taken from and incubated at 0.5 m, the rate of nitrogen fixation per unit volume of water was lowest at night (~6% of the maximum daytime rate), increased from dawn until early afternoon, a...
متن کاملThe light response of nitrogen fixation in Lake Valencia, Venezuela’
Water samples from six depths in the upper water column of Lake Valencia, Venezuela, were incubated in situ with acetylene at several depths corresponding to different light exposures. On five dates there was sufficient nitrogen fixation to define the light-response curve for samples taken at 2 and 100 cm. The light response of nitrogen fixation was modeled successfully with an equation previou...
متن کاملThe horizontal heterogeneity of nitrogen fixation in Lake Valencia, Venezuela’
Spatial and temporal variability of nitrogen fixation in Lake Valencia, Venezuela, were quantified on the basis of duplicate water samples collected from a depth of 0.5 m at 16 sites on 10 dates. The concentration of heterocysts in samples was determined and the samples were incubated with acetylene in situ. Two-way ANOVA was used to separate the variance associated with site (fixed spatial pat...
متن کاملAssociation of hydrogen metabolism with methanogenesis in Lake Mendota sediments.
Lake Mendota sediments were studied to determine the role of H2 in sediment methanogenesis. H2 was generally not detectable in sediment. The addition of H2 to sediment significantly increased methanogenensis. The amount of methane produced was proportional to the concentration of hydrogen added. H2 addition stimulated the reduction of CO2 to methane, but did not significantly stimulate the conv...
متن کاملCoherence between lake ice cover, local climate and teleconnections (Lake Mendota, Wisconsin)
0022-1694/$ see front matter 2009 Elsevier B.V. A doi:10.1016/j.jhydrol.2009.06.024 * Corresponding author. Tel.: +1 414 229 6756; fax E-mail address: [email protected] (H.R. Bravo). Ice duration has shortened and the ice-off date has become earlier for Lake Mendota from 1905 to 2000 as air temperatures have warmed and snowfall has increased. In addition, the ice record has cyclic components at i...
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ژورنال
عنوان ژورنال: Limnology and Oceanography
سال: 1976
ISSN: 0024-3590
DOI: 10.4319/lo.1976.21.3.0365