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Investigation of diatom endemism and species response to climate events using examples from the genera Cyclotella (Lindavia) and Surirella in the Lake El'gygytgyn sediment record

Feitl, Melina G
http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1467979020

Abstract Details

2016, Master of Science (MS), Bowling Green State University, Geology.
Diatom assemblages from ancient lakes are a powerful proxy for recording past climatic events due to their high environmental sensitivity. A composite core drilled from Lake El’gygytgyn, northeastern Russian Arctic, contains an abundant diatom record extending to ~3.5 Ma. Preliminary research on the core has documented multiple shifts between the dominant planktonic genera. Declines in the plankton concentration have been associated with cold events. However, the nature of the lake’s ice cover during these events is still debated. To understand the connections between diatoms and climate in the lake, a systematic morphologic analysis was performed on examples of the planktonic genus Cyclotella (Lindavia) and the large benthic genus Surirella. Observations were made using light microscopy and scanning electron microscopy on samples from 1.2 Ma to recent. Cyclotella valves have large diameter and multiple morphologies during warm intervals and have smaller diameter and a single morphology during cold intervals. Major changes in morphology coincide with cold, low productivity events. These observations suggest that Cyclotella morphology is strongly climate driven. Large Surirella species occur throughout the 1.2 myr record, increasing in abundance from ~500 ka to recent. Abundance and morphological changes are less correlated with climatic variability suggesting that Surirella habitats are less influenced by events affecting the lake’s plankton
Jeffrey Snyder (Advisor)
Sheila Roberts (Committee Member)
Peg Yacobucci (Committee Member)
146 p.
Paleoclimate Science
Cyclotella; Surirella; Lake Elgygytgyn; paleoclimate; paleolimnology; ancient lakes; Arctic; diatoms

Recommended Citations

Citations

  • Feitl, M. G. (2016). Investigation of diatom endemism and species response to climate events using examples from the genera Cyclotella (Lindavia) and Surirella in the Lake El'gygytgyn sediment record [Master's thesis, Bowling Green State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1467979020

    APA Style (7th edition)

  • Feitl, Melina. Investigation of diatom endemism and species response to climate events using examples from the genera Cyclotella (Lindavia) and Surirella in the Lake El'gygytgyn sediment record. 2016. Bowling Green State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1467979020.

    MLA Style (8th edition)

  • Feitl, Melina. "Investigation of diatom endemism and species response to climate events using examples from the genera Cyclotella (Lindavia) and Surirella in the Lake El'gygytgyn sediment record." Master's thesis, Bowling Green State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1467979020

    Chicago Manual of Style (17th edition)

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