Journal ArticleDOI
Lake trophic state and the limnological effects of omnivorous fish
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The experiment suggests that filter-feeding omnivorous fish interact synergistically with trophic state so that the limnological effects of omnivory fish become more intense with increased eutrophication.Abstract:
Ecologists have hypothesized that planktivorous fish have greater effects on the plankton and water quality of oligotrophic lakes than eutrophic lakes We tested this hypothesis in a tank-mesocosm experiment of factorial design in which five biomass levels of filter-feeding omnivorous gizzard shad (Dorosoma cepedianum) were cross-classified with two levels of lake trophic state achieved by filling tank-mesocosms with water and plankton transported by truck from two lakes with different trophic states The presence of gizzard shad significantly increased total phosphorus, primary productivity, chlorophyll, and particulate phosphorus (PP) 2–20 and 20–200 µm and significantly decreased Secchi depth, cladocerans, copepods and PP > 200 µm The effects of gizzard shad on chlorophyll, Secchi depth, cladocerans, copepods and PP 2–20 and > 200 µm were dependent on lake trophic state and most intense in the eutrophic lake system This experiment suggests that filter-feeding omnivorous fish interact synergistically with trophic state so that the limnological effects of omnivorous fish become more intense with increased eutrophicationread more
Citations
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Journal ArticleDOI
Microcosm experiments have limited relevance for community and ecosystem ecology: comment
Ray W. Drenner,Asit Mazumder +1 more
TL;DR: In this article, the authors present an alternative view of the role of microcosm experiments for both research and graduate education in aquatic ecology and argue that there is little information supporting Carpenter's (1996) suggestion that microcosms are disconnected from natural lake systems.
Journal ArticleDOI
Nutrient cycling by fish supports relatively more primary production as lake productivity increases.
Michael J. Vanni,Anna M. Bowling,Elizabeth M. Dickman,R. Scott Hale,Karen A. Higgins,Martin J. Horgan,Lesley B. Knoll,William H. Renwick,Roy A. Stein +8 more
TL;DR: This study quantified the nutrient cycling role of an abundant detritivorous fish species, the gizzard shad, in reservoir ecosystems along a gradient of ecosystem productivity, and supports the hypothesis that watersheds and gizzardShad jointly regulate primary production in reservoirs ecosystems.
Journal ArticleDOI
Linking Landscapes and Food Webs: Effects of Omnivorous Fish and Watersheds on Reservoir Ecosystems
Michael J. Vanni,Kristin K. Arend,Mary T. Bremigan,David B. Bunnell,James E. Garvey,María J. González,William H. Renwick,Patricia A. Soranno,Roy A. Stein +8 more
TL;DR: The abundance of gizzard shad increases with watershed agriculturalization, most likely through a variety of mechanisms operating on larval and adult life stages as mentioned in this paper, and many of their effects vary with ecosystem productivity (i.e., watershed land use).
Journal ArticleDOI
Do the trophic cascade hypothesis and classical biomanipulation approaches apply to tropical lakes and reservoirs
TL;DR: In this paper, the trophic cascade hypothesis and classical biomanipulation approaches apply to tropical lakes and reservoirs, and the results show that they apply well in tropical lakes.
Journal ArticleDOI
Effects of gizzard shad on phytoplankton and nutrient dynamics: role of sediment feeding and fish size
TL;DR: Gizzard shad impact phytoplankton through an interaction of top-down and bottom-up effects, which are facilitated by a large detrital subsidy to this system.
References
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Book
Statistical Principles in Experimental Design
TL;DR: In this article, the authors introduce the principles of estimation and inference: means and variance, means and variations, and means and variance of estimators and inferors, and the analysis of factorial experiments having repeated measures on the same element.
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Statistical Principles in Experimental Design
TL;DR: This chapter discusses design and analysis of single-Factor Experiments: Completely Randomized Design and Factorial Experiments in which Some of the Interactions are Confounded.
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A trophic state index for lakes1
TL;DR: A numerical trophic state index for lakes has been developed that incorporates most lakes in a scale of 0 to 100, which represents a doubling in algal biomass as well as various measures of biomass or production.
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The measurement of total phosphorus in seawater based on the liberation of organically bound fractions by persulfate oxidation1
David W. Menzel,Nathaniel Corwin +1 more
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Trophic Relationships in Freshwater Pelagic Ecosystems
TL;DR: Relative impacts of bottom-up (producer controlled) and top-down (consumer controlled) forces on the biomass and size structure of five major components of freshwater pelagic systems were estimated.