Responses of phytoplankton to varied resource availability in large lakes of the Greater Yellowstone Ecosystem

Article Abstract:

Phytoplankton responses to varying resource availability have been studied in three large lakes in the Greater Yellowstone Ecosystem. Connections between aquatic communities and changing environmental conditions were of interest with the hypothesis that algal species efficient in using a certain resource would be correlated with low relative concentrations of the resources, P, N, Si and light. Relationships between resource availability and phytoplankton seasonal succession in the lakes are described

Wyoming, Lakes, Greater Yellowstone ecosystem

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Delta-13 C composition of primary producers and role of detritus in a freshwater coastal ecosystem

Article Abstract:

Wetland phytoplankton may have a relatively depleted delta-13 carbon ratio of dissolved inorganic carbon (DIC) compared to pelagic algae because decomposing detritus is the source of fixed carbon. An in situ experiment demonstrated that the surrounding water is enriched with significant amounts of 13C-depleted DIC as a result of respiration from macrophyte decomposition, and this process lowers the net delta-13 C ratio of DIC in the water when the turbulence is low.

Wetland ecology, Lake Superior, Carbon cycle (Biogeochemistry), Carbon cycle, Detritus

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Determining trophic state in experimental lakes

Article Abstract:

Determination of trophic state in experimental lakes is discussed. If study lakes are small and potentially meromictic, generalization of study results to culturally eutrophied lakes may not be justified. Testing should be carried out to see whether established relationships for such lakes are applicable. Results used to assess trophic state should be in volumetric units used in the trophic state context.

Canada, Statistical Data Included, Methods, Water, Water chemistry, Eutrophication, Chlorophyll, Experimental design, Research design, Phosphorus, Phosphorus (Chemical element), Dissolved oxygen

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