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The effects of nutrients, fathead minnows, and submersed macrophytes on the invertebrate community and habitat quality of Delta Marsh

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dc.contributor.author Sandilands, Ken A. en_US
dc.date.accessioned 2007-06-01T19:20:40Z
dc.date.available 2007-06-01T19:20:40Z
dc.date.issued 2000-06-01T00:00:00Z en_US
dc.identifier.uri http://hdl.handle.net/1993/2309
dc.description.abstract The effect of nutrient addition, macrophyte removal and fathead minnow addition on the invertebrate community and habitat quality of Delta Marsh was assessed using 'in situ' enclosures in the Blind Channel. Factors important in determining the stable state of the marsh were chosen as treatments (nutrient addition, submersed macrophyte removal, and fathead minnow addition). The clear water stable state, characterized by low turbidity, low phytoplankton biomass and abundant submersed macrophytes, is most likely when nutrient loading is low, macrophytes are abundant, and top-down control from planktivorous fish is low. The turbid water state, characterized by high turbidity, high phyloplankton biomass and few submersed macrophytes, is most likely when nutrient loading is high, submersed macrophyte biomass is sparse, and top-down control is high. Inorganic nutrient addition (N and P) was found to cause phytoplankton blooms, and thus turbid conditions when submersed macrophyle biomass was relatively low. However, nutrient addition did not cause phytoplankton blooms or turbid conditions when submersed macrophytes were abundant. Addition of fathead minnows resulted in decreased densities of microinvertebrates, and thus a greater biomass of phytoplankton, due to decreased grazing pressure via the trophic cascade. Submersed macrophytes did not provide a refuge for zooplankton from predation by planktivorous young of the year fathead minnows. en_US
dc.format.extent 4873467 bytes
dc.format.extent 184 bytes
dc.format.mimetype application/pdf
dc.format.mimetype text/plain
dc.language en en_US
dc.language.iso en_US
dc.title The effects of nutrients, fathead minnows, and submersed macrophytes on the invertebrate community and habitat quality of Delta Marsh en_US
dc.degree.discipline Zoology en_US
dc.degree.level Master of Science (M.Sc.) en_US


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