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Dead Giveaway: Rising Mortality Rates Suggest Effectiveness Of Lake Erie Grass Carp (Ctenopharyngodon idella) Control

Lang, Kaitlen
http://orcid.org/0000-0002-5224-562X
http://rave.ohiolink.edu/etdc/view?acc_num=toledo1651772333192628

Abstract Details

2022, Master of Science, University of Toledo, Biology (Ecology).
Grass Carp (Ctenopharyngodon idella) is a large, invasive herbivore that may harm Lake Erie’s ecology and economy. A large-scale, multi-agency collaboration to remove as many Grass Carp as possible from the basin has increased effort every year since 2017. However, removal has fallen short of the Lake Erie Committee’s goal of 390 fish per year since its enactment. A biological indicator, such as mortality, can assess changes in population demographics and may provide a more sensitive way than total catch to determine whether control efforts are effective. I modeled mortality rates from 2014-2021 using a multilevel linear model to estimate annual mortality, relative to the overall mean, from the entire time-series of data. The data were grouped by the number of fish in each age class within each year. This analysis suggests that mortality rates increased after 2017. Positive correlations between mortality and the number of fish harvested per year suggest that removal may be driving increases in the mortality rate. This research directly addressed fishery managers needs to better understand Grass Carp population dynamics and supports the adaptive management framework identified in the Lake Erie Grass Carp Adaptive Response Strategy.
Christine Mayer (Committee Chair)
Patrick Kocovsky (Committee Member)
William Hintz (Committee Member)
Mark DuFour (Committee Member)
33 p.
Ecology
Great Lakes, Invasion Biology, Ecology

Recommended Citations

Citations

  • Lang, K. (2022). Dead Giveaway: Rising Mortality Rates Suggest Effectiveness Of Lake Erie Grass Carp (Ctenopharyngodon idella) Control [Master's thesis, University of Toledo]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1651772333192628

    APA Style (7th edition)

  • Lang, Kaitlen. Dead Giveaway: Rising Mortality Rates Suggest Effectiveness Of Lake Erie Grass Carp (Ctenopharyngodon idella) Control. 2022. University of Toledo, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=toledo1651772333192628.

    MLA Style (8th edition)

  • Lang, Kaitlen. "Dead Giveaway: Rising Mortality Rates Suggest Effectiveness Of Lake Erie Grass Carp (Ctenopharyngodon idella) Control." Master's thesis, University of Toledo, 2022. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1651772333192628

    Chicago Manual of Style (17th edition)

toledo1651772333192628
178
© 2022, all rights reserved.
This open access ETD is published by University of Toledo and OhioLINK.