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Full-Text Articles in Physical Sciences and Mathematics
Microbial Methane Production In Oxygenated Water Column Of An Oligotrophic Lake, Hans-Peter Grossart, Katharina Frindte, Claudia Dziallas, Werner Eckert, Kam W. Tang
Microbial Methane Production In Oxygenated Water Column Of An Oligotrophic Lake, Hans-Peter Grossart, Katharina Frindte, Claudia Dziallas, Werner Eckert, Kam W. Tang
VIMS Articles
The prevailing paradigm in aquatic science is that microbial methanogenesis happens primarily in anoxic environments. Here, we used multiple complementary approaches to show that microbial methane production could and did occur in the well-oxygenated water column of an oligotrophic lake (Lake Stechlin, Germany). Oversaturation of methane was repeatedly recorded in the well-oxygenated upper 10 m of the water column, and the methane maxima coincided with oxygen oversaturation at 6 m. Laboratory incubations of unamended epilimnetic lake water and inoculations of photoautotrophs with a lake-enrichment culture both led to methane production even in the presence of oxygen, and the production was …
A Brown-World Cascade In The Dung Decomposer Food Web Of An Alpine Meadow: Effects Of Predator Interactions And Warming, Xw Wu, Je Duffy, Pb Reich, Sc Sun
A Brown-World Cascade In The Dung Decomposer Food Web Of An Alpine Meadow: Effects Of Predator Interactions And Warming, Xw Wu, Je Duffy, Pb Reich, Sc Sun
VIMS Articles
Top-down control has been extensively documented in food webs based on living plants, where predator limitation of herbivores can cascade to facilitate plant growth (the green-world hypothesis), particularly in grasslands and aquatic systems. Yet the ecosystem role of predators in detrital food webs is less explored, as is the potential effect of climate warming on detritus-based communities. We here show that predators have a "brown-world" role in decomposer communities via a cascading top-down control on plant growth, based on the results of an experiment that factorially manipulated presence and size of two predator species as well as temperature (warmed vs. …
Multivariable Statistical Regression Models Of The Areal Extent Of Hypoxia Over The Texas-Louisiana Continental Shelf, David R. Forrest, Rochelle Hetland, Sf Dimarco
Multivariable Statistical Regression Models Of The Areal Extent Of Hypoxia Over The Texas-Louisiana Continental Shelf, David R. Forrest, Rochelle Hetland, Sf Dimarco
VIMS Articles
Observations of the areal extent of seasonal hypoxia over the Texas-Louisiana continental shelf from 1985 to 2010 are correlated with a variety of physical and biogeochemical forcing mechanisms. Significant correlation is found between hypoxic area and both nitrogen load (r(2) = 0.24) and east-west wind speed (r(2) = 0.16). There is also a significant increasing trend in the areal extent of hypoxia in time; a linearly increasing trend over the entire record (r(2) = 0.17), a step increase in area for the years 1994 and beyond (r(2) = 0.21), and a step increase for 1993 and beyond (r(2) = 0.29) …