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DISSOLVED OXYGEN TOLERANCES OF POST-VELIGER DREISSENIDS

Fagan, Troy Matthew
http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1303488445

Abstract Details

2011, Master of Science (MS), Bowling Green State University, Biological Sciences.
Dreissena bugensis, a freshwater mussel from the Ponto-Caspian region, was discovered in Lake Erie in 1989. Though similar to Dreissena polymorpha, a previous invader to the Great Lakes, it was initially thought that Dreissena bugensis is regulated to colder, deeper portions of the lake were they were thought to be competitively dominant. However, recent evidence indicates that quagga mussels (Dreissena bugensis) have replaced zebra mussels (Dreissena polymorpha) throughout the shallow warm water of Lake Erie’s western basin. Many studies have looked at the physiological and biochemical differences between the two dreissenid species, but no definitive explanation has been given for the slow but overwhelming displacement of Dreissena polymorpha by Dreissena bugensis. In this study, I look specifically at the hypoxia tolerance of post-veliger dreissenids, and determine if mortality rates vary between species over a range of dissolved oxygen concentrations (0.0 – 2.0 mg/l) in a 12-hour period. From August 2007 to September 2007 over 900 dreissenids were collected and tested in 48 trials. Based on a binary logistic regression analysis there was a direct correlation between dreissenid survivorship and dissolved oxygen concentrations (p<0.001), but there was no difference between D. polymorpha and D. bugensis mortality over the dissolved oxygen levels tested (z=-0.069, p=0.484). For the size class tested, visual identification was not possible and some D. polymorpha may have been present in the D. bugensis trials. In order to determine the effect of misclassifying our dreissenids from Lake Erie, I reanalyzed the data assuming that as many as 10% of the D. bugensis were actually D. polymorpha and found a significant species iii effect (z=-2.40, p=0.016). My hypothesis that D. bugensis are more tolerant of lower dissolved oxygen than D. polymorpha as settling post-veligers was not supported by the data I was able to generate. However, the data is limited because it is possible that some of the assumed D. bugensis were in fact D. polymorpha.
Jeffrey G. Miner, PhD (Advisor)
Christine Mayer, PhD (Committee Member)
R. Michael McKay, PhD (Other)
26 p.
Biology; Ecology; Freshwater Ecology
Zebra Mussel; Quagga Mussel; Species Replacement; Dissolved Oxygen; Dreissena polymorpha; Dreissena bugensis; Veliger; Druse; Lake Erie

Recommended Citations

Citations

  • Fagan, T. M. (2011). DISSOLVED OXYGEN TOLERANCES OF POST-VELIGER DREISSENIDS [Master's thesis, Bowling Green State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1303488445

    APA Style (7th edition)

  • Fagan, Troy. DISSOLVED OXYGEN TOLERANCES OF POST-VELIGER DREISSENIDS. 2011. Bowling Green State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1303488445.

    MLA Style (8th edition)

  • Fagan, Troy. "DISSOLVED OXYGEN TOLERANCES OF POST-VELIGER DREISSENIDS." Master's thesis, Bowling Green State University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1303488445

    Chicago Manual of Style (17th edition)

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This open access ETD is published by Bowling Green State University and OhioLINK.