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2 edition of Effects of gizzard shad on nutrient cycles and phytoplankton in a reservoir ecosystem found in the catalog.

Effects of gizzard shad on nutrient cycles and phytoplankton in a reservoir ecosystem

Maynard H Schaus

Effects of gizzard shad on nutrient cycles and phytoplankton in a reservoir ecosystem

roles of diet, biomass and population size-structure

by Maynard H Schaus

  • 166 Want to read
  • 7 Currently reading

Published .
Written in English

    Subjects:
  • Gizzard shad -- Food,
  • Gizzard shad -- Size,
  • Reservoir ecology

  • Edition Notes

    Statementby Maynard H. Schaus
    The Physical Object
    Paginationix, 158 leaves :
    Number of Pages158
    ID Numbers
    Open LibraryOL15245297M

      Consumption of benthic-derived nutrients and subsequent excretion of these nutrients into the water column by gizzard shad represents an important nutrient source to phytoplankton (Shostell and Bukaveckas, ; Vanni et al., ; Schaus et al., ; Williamson et al., ). However, the role of nutrient storage in living fish and the fate.   Black dots are empirical data of phytoplankton (producer), zooplankton (consumer), and larval gizzard shad (predator) production from mesocosm experiments by Dickman et al. (). Gray bars show model predictions under high light K = mg C/L, low light K = mg C/L, high nutrient P = mg P/L, and low nutrient P = mg P/L .

      Shallow lakes are dominated by small omnivorous fish, but the roles of these small fish in aquatic ecosystems are not well-known. A small omnivorous bitterling (Acheilognathus macropterus) has been found to be dominant after lake restoration in shallow lakes. We conducted a mesocosm experiment to examine the effects of bitterling on water quality and . We also collected weekly samples of potential food resources (phytoplankton and periphyton) for the estimation of algal production and stoichiometric quality (carbon:nitrogen:phosphorus). Light had strong effects on food resource quality; however, resource quality did not significantly predict tadpole growth or development.

    The gizzard shad (Dorosoma cepedianum), for example, has a voracious appetite for various forms of plankton across its life cycle. It is an obligate planktivore when it is a juvenile, in part due to its very small mouth size. As it grows it becomes an omnivore, taking phytoplankton, zooplankton, and larger pieces of nutritious detritus.   We investigated the roles of a benthivorous (Prochilodus brevis, Steindachner ) and a planktivorous (Oreochromis niloticus, Linnaeus, ) fish in translocating phosphorus from the benthic to the pelagic habitat of a tropical eutrophic shallow lake and its impact on phytoplankton biomass and water transparency. We performed two field .


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Effects of gizzard shad on nutrient cycles and phytoplankton in a reservoir ecosystem by Maynard H Schaus Download PDF EPUB FB2

We examined the role of the omnivorous fish, gizzard shad (Dorosoma cepedianum), in transporting nutrients from sediments into the water column and their subsequent impacts on manipulated sediment access and fish size during two mesocosm experiments to determine how these factors could alter the effects of gizzard shad on by:   The detritivorous fish, gizzard shad (Dorosoma cepedianum), provides nutrients to phytoplankton in reservoirs by ingesting organic detritus associated with sediments and excreting substantial quantities of nutrients such as N and P in soluble forms that are highly available to estimated nutrient excretion by gizzard shad in a eutrophic reservoir Cited by: Effects of gizzard shad Dorosoma cepedianum on benthic communities in a large southern reservoir (Lake Texoma, U.S.A.) were examined during two field enclosure and exclosure experiments in which enclosures were stocked at high and low densities in and 1.

The St. Johns River Water Management District removed over million kg of gizzard shad (Dorosoma cepedianum) from Lake Apopka, FL during –, as a means of reducing lake phosphorus and phytoplankton concentrations and improving water steps included reduction of external nutrient inputs and operation of a treatment by:   Effects of gizzard shad on nutrient cycles and phytoplankton in a reservoir ecosystem: roles of diet, biomass and population size-structure.

Dissertation. Miami University, Oxford, Ohio, USA. Gizzard shad stimulated total N and P, suggesting an important nutrient transport effect. Thus, gizzard shad impact phytoplankton through an interaction of top-down and bottom-up effects.

Lakewidc gizzard shad biomass in July was kg ha -I, Our estimates of nutrient excretion by the gizzard shad population ranged from to pmol NH,-N liter-' d-l and to Gizzard shad have myriad effects on reservoirs, including impacts on nutrients, phytoplankton, zooplankton, and fish, and many of their effects vary with ecosystem productivity (i.e., watershed.

The American gizzard shad (Dorosoma cepedianum), also known as the mud shad, is a member of the herring family of fish, and is native to large swaths of fresh and brackish waters of the United States of America. The adult has a deep body, with a silvery-green coloration above fading to plain silver below.

The gizzard shad commonly resides in freshwater lakes, reservoirs. Therefore, gizzard shad can magnify the direct effects of nutrient subsidies on phytoplankton production, and these multiple effects must be considered in.

Much research had been conducted on the influence of gizzard shad in more nutrient limited reservoir systems. Gizzard shad can effectively cycle nutrients from the benthos into the pelagia through foraging and excretion and often times they release nutrients not previously available in these systems (Schaus et al.,Vanni,Vanni et.

To compare the nutrient effects of gizzard shad. among gizzard shad, zooplankton, and phytoplankton in. We examined effects of two cycles of variation in rainfall using a.

Effects of gizzard shad on phytoplankton and nutrient dynamics: role of sediment feeding and fish size. Ecology Crossref, ISI, Google Scholar. Schaus MH, Vanni MJ, Wissing TE, Bremigan MT, Garvey JE, Stein RA. Nutrient release by one of the consumers (gizzard shad) was compared with tributary loading over a nine-year period to assess inter-annual variation in their relative importance.

Historical records of inflow chemistry, discharge and gizzard shad biomass showed that variation in tributary inputs was the primary determinant of seasonal and inter. Schaus, M. H., Effects of Biomanipulation on Nutrient Cycles in Central Florida Lakes via Nutrient Excretion and Bioturbation by Gizzard Shad.

Project #SKAA, Final Report. Johns River Water Management District, Palatka, FL. Comparison of ponds containing gizzard shad with control ponds without fish showed that gizzard shad predation suppressed populations of Keratella sp., Diaphanosoma brachyurum, copepod nauplii, Chaoborus sp., and cyclopoid copepodids and adults, but enhanced populations of Diaptomus pallidus copepodids and adults.

These results confirm previous laboratory. Gizzard shad feed mostly on sediment detritus and excrete sediment‐derived nutrients into the water column, thereby mediating a cross‐habitat translocation of nutrients to phytoplankton.

We quantified nitrogen and phosphorus cycling (excretion) rates of gizzard shad, as well as nutrient demand by phytoplankton, in seven lakes over a four. Analysis of an year dataset from seven shallow lakes in Florida provides evidence of hydrologic factors controlling dynamics of cyanobacteria blooms.

Depth was the most important variable, and there was a synergistic effect with flushing. When the lakes were deep, rainfall led to water discharges and disruption of stagnant conditions that maintained blooms.

Effects of biomanipulation on nutrient cycles in central Florida lakes via nutrient excretion and bioturbation by gizzard shad Effects of Gizzard Shad on Phytoplankton and Nutrient.

Schaus M.H. and Vanni M.J., Effects of omnivorous gizzard shad on phytoplankton and nutrient dynamics: role of sediment feeding and fish size.

Ecology, 81, – [CrossRef] [Google Scholar]. Gizzard Shad Dorosoma cepedianum are commonly manipulated as a prey species in the United States but are widely viewed as undesirable in small impoundments because of direct and indirect effects on desirable sport fishes.

Montgomery State Fishing Lake in southeastern Kansas became populated with Gizzard Shad during a flood event inand .The influx of large numbers of alewife, Alosa pseudoharengus, into relatively small freshwater systems may have a considerable impact upon pre—established food chains and nutrient cycles.

We estima.Introduction. Fish affect lacustrine nutrient dynamics directly and indirectly. Direct effects occur by the regeneration (excretion and egestion), sequestration and translocation of nutrients while indirect effects result from feeding activities that alter community structure, e.g., differential predation effects on zooplankton composition or zoobenthic biomass.