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Effects of Light and Turbidity on Foraging Efficiency of Larval Walleye Sander Vitreus

Osborn, Joshua Clay

Abstract Details

2008, Master of Science (MS), Bowling Green State University, Biological Sciences.

Varying levels of light and turbidity are common in the shallow habitats used by some fish species as nurseries. Light attenuation and reductions in reaction distance from suspended sediments are known to negatively affect foraging by adult and juvenile fishes, but the effects of these variables on larval fish have been mixed. Herein, I test the effects of environmentally relevant levels of light (0.5 and 15.0 μmol .s-1.m-2) and turbidity (0, 10, 40, and 100 NTU) onforaging by larval walleye (Sander vitreus) when feeding on zooplankton. Ingested prey biomass was not significantly different as functions of light, turbidity, or their interaction (two-way ANOVA, α = 0.05), although trends in consumption suggest that walleye larvae may forage more efficiently at high light. In addition, apparent foraging peaks at 40 NTU suggest that foraging by walleye larvae may be maximized at intermediate turbidity. Foraging rate was exceptionally reduced for these larval walleye compared to numerical consumption rates found in the literature, so any trends (or lack of trends) need to be assessed in this context. However, the results are consistent with studies reporting detrimental effects of light reduction, and enhanced feeding in the presence of turbidity.

Jeffrey G. Miner, Ph.D. (Advisor)
Rex L. Lowe, Ph.D. (Committee Member)
Christine M. Mayer, Ph.D. (Committee Member)
24 p.

Recommended Citations

Citations

  • Osborn, J. C. (2008). Effects of Light and Turbidity on Foraging Efficiency of Larval Walleye Sander Vitreus [Master's thesis, Bowling Green State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1210825318

    APA Style (7th edition)

  • Osborn, Joshua. Effects of Light and Turbidity on Foraging Efficiency of Larval Walleye Sander Vitreus. 2008. Bowling Green State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1210825318.

    MLA Style (8th edition)

  • Osborn, Joshua. "Effects of Light and Turbidity on Foraging Efficiency of Larval Walleye Sander Vitreus." Master's thesis, Bowling Green State University, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1210825318

    Chicago Manual of Style (17th edition)