Weider Lab Fall 2017: Back Row: L-R: Larry Weider, Jake Scott, Emily Kiehnau, Michael Onwuchuruba, Ronak Tapiavala; Front Row: L-R: Ritu Kulkarni, Rachel Hartnett
2018 Dr. Silvia Markova and Dr. Petr Kotlik, Institute of Animal Physiology and Genetics, Czech Academy of Sciences, (March-December)
2008 Dr. Teresa Crease, Department of Integrative Biology, University of Guelph, Ontario, Canada (February-May)
2012-15 Dr. Joaquin Muńoz, U. of Oklahoma Biological Station/Sevilla, Spain
2010-13 Dr. Philip Morton, U. of Oklahoma Biological Station (currently at the University of Oklahoma School of Denistry)
2007-15 Dr. Dagmar Frisch, U. of Oklahoma Biological Station (currently a Bioinformatics Instructor, Berlin, Germany)
2006-07 Dr. James Larson, U. of Oklahoma Biological Station (currently a Research Scientist, USGS Upper Midwest Environmental Science Center, La Crosse, Wisconsin)
2005-06 Dr. Chad Hargrave, U. of Oklahoma Biological Station (currently an Associate Professor, Dept. of Biological Sciences and Associate Vice-President for Research & Special Programs, Sam Houston State U., Texas)
2000-01 Dr. Richard Broughton, Dept. of Zoology/Biological Station, U. of Oklahoma (currently Professor and Chair, OU Dept. of Biology)
1997 Dr. Martin Cerny, Dept. of Hydrobiology, Charles University, Prague, Czech Rep.
1994-96 Dr. Piet Spaak, Centre for Limnology, Netherlands Inst. of Ecology, Nieuwersluis, NL(currently Head of the Dept. of Aquatic Ecology, EAWAG, Dubdendorf, Switzerland)
1995 Dr. France Dufresne, Dept. of Zoology, U. of Guelph, Ontario, Canada. (currently an Associate Professor, Dept. of Biology, U. of Quebec at Rimouski)
1994-95 Dr. Luc De Meester, Laboratory of Animal Ecology, U. of Ghent, Belgium. (currently Professor, Dept. of Biology, KU-Leuven, Belgium; effective 15 January 2020 – Scientific Director, Leibnitz Institute of Freshwater Ecology & Inland Fisheries – IGB, Berlin, Germany)
1991-93 Dr. Joanna Pijanowska, Dept. of Hydrobiology, U. of Warsaw, Poland (currently Head of this department since 2010).
Graduate Student Alumni:
2012-2017 Rachel Harnett (Ph.D., former NSF Graduate Research Fellow; currently a postdoc at Oklahoma State University)
Dr. Hartnett’s work has focused on how population dynamics influence community properties using Daphnia as a model organism. She has been interested in potential mechanisms of size-distribution variation along an increasing experimental scale of size and ecological complexity (from life-history to mesocosm experiments). From this work, she has focused on two main arms: 1) mechanisms and patterns of size distributions, and 2) the role of species evenness in community theory and application. Rachel successfully defended her Ph.D. dissertation in November 2017, and was awarded her doctorate in December 2017. She was awarded and has accepted one of the inaugural Diversity Postdoctoral Fellowships in the College of Arts & Sciences (CAS) at Oklahoma State University. She took up her new position effective 1 July 2018. Please visit her website http://www.rnhartnett.net for more information.
2010-16 Billy Culver (Ph.D. student, U. of Oklahoma) (currently an Assistant Professor of Biology, School of Biological & Physical Sciences, Northwestern State University of Louisiana)
2013-15 Aime’e Yousey (M.S. student, U. of Oklahoma) (currently in the private sector in Albuquerque, N.M.)
2008-10 Mingyan Lin (M.S., U. of Oklahoma)
2002-07 Punidan Jeyasingh (Ph.D., U. of Oklahoma) (currently an Associate Professor, Dept. of Integrative Biology, Oklahoma State Univ.)
2000-01 Wenjun Wang (Ph.D. student, U. of Oklahoma)
1997-00 Petra Limburg (Ph.D., U. of Kiel, Germany) (currently in the private sector in Germany)
1996-99 Thomas Berendonk (Ph.D., U. of Kiel, Germany) (currently Professor of Limnology, Technical University-Dresden, Germany)
1997-98 Angelika Denk (M.Sc. student, U. of Regensburg, Germany)
1994-97 Suzanne E. Mitchell (Ph.D. – NERC-CASE, U. of Hull, England) (currently Director, Aeona Limited, Edinburgh, Scotland)
1997 Lilla Pokutta (M.Sc. – U. of Hamburg, Germany)
1989-90 Mary H. Murdoch (M.Sc. – U. of Windsor, Canada) (currently Principal, Stantec Environmental Services, Fredericton, New Brunswick, Canada)
Undergraduate Student Alumni:
2018-2019 Kristina Floyd (B.S. Honors, U. of Oklahoma)
Kristina worked as a summer Undergraduate Research Assistant (UGRA) for our lab in summer 2018. Her Honors Research project examined the effects of food quality differences (i.e., high phosphorus – P vs low P food) on life-history fecundity patterns in a set of F2 recombinant inbred lines (clones) of Daphnia pulicaria established by selfing a F1 hybrid clone from two F0 parental lines from South Center (SC) Lake in Minnesota. (Kristina started at OU Dental School in June 2019.)
2018-2019 Brandon Day (B.S., U. of Oklahoma)
Brandon joined the lab in fall 2018, and he conducted Independent Study, in collaboration with Matt Wersebe. He examined salinity tolerance differences among Daphnia pulicaria clones isolated from Minnesota lakes. (Currently, Brandon has applied for the Environmental Law program – U. of Texas at San Antonio.)
2017-2019 Ritu Kulkarni (B.S. Honors – U. of Oklahoma)
Ritu joined our lab in fall 2017. Her Honors Research project focused on the interactions between food quality and predator kairomones on the life-history features of Daphnia pulex, D. pulicaria, and an experimentally-created hybrid clone between these two parental species. She defended her Honors Research Thesis in December 2018, and presented her results at the Annual OU Undergraduate Research Day in Spring 2019. (Ritu is currently a senior at OU and is slated to graduate in May 2020 with the intent to enter medical school after graduation.)
2017-2018 Ronak Tapiavala (B.S., U. of Oklahoma)
Ronak’s research project involved the study of the artificial sweetener sucralose, and its potential impact on physiological and metabolic aspects of Daphnia. Sucralose is one of the main ingredients found in the artificial sweetener, Splenda, which is found in a wide variety of low-calorie beverages. Given that sucralose is quite “metabolically stable”, much of it ends up into aquatic ecosystems via waste-water run-off. Its role as a man-made eco-toxicant remains to be fully examined. One of the major assays that Ronak performed involved testing the effects of sucralose on the heart rate of various clones of Daphnia, including both modern-day clones, as well as “ancient” (centuries-old) clones to determine if modern Daphnia clones have adapted to this artificial sweetener. Here is a video clip of a Daphnia pulicaria female (carrying eggs/embryos) that has been exposed to sucralose. You can see the beating heart just above the brood chamber, which contains developing embryos. (Ronak graduated from OU in May 2018. He began dental school at the UT Health San Antonio School of Dentistry in fall 2019.)
2017 – 2018 Jake Scott (B.S., U. of Oklahoma)
Jake joined our lab in fall 2017. He completed his independent study project in spring 2018, which was a comparative study on the “nutritional ecology” of several different algal food types and their impact on growth and reproduction among several species of Daphnia, including D. pulicaria, and D. mendotae. Jake graduated from OU in May 2019.
2016-17 Michael Onwuchuruba (B.S., National Merit Scholar, U. of Oklahoma). Michael graduated from OU in May 2018 and is applying to medical/DO schools.
2016-17 Christian Brewer (B.S., U. of Oklahoma, National Merit Scholar, OU Honors College)(Christian started medical school in August 2017 at UT-Southwestern in Dallas).
2015-16 Hayley Severson (B.S., U. of Oklahoma, National Merit Scholar, UROP award winner) (Hayley completed her Masters of Public Health, U. of Wisconsin-Madison, and began medical school at UWM in fall 2017).
2012-2016 Frank “Weston” Speer (B.S. Biology, 2016, U. of Oklahoma; UROP award winner)
Weston’s research project involved the study of the aquatic crustacean (brine shrimp) Artemia franciscana, a prominent model organism. With the aid of international colleagues, he obtained A. franciscana populations from several different countries. His project aimed to determine the optimal hatching cues for these populations. Additionally, he engineered a novel hatchery system that could be applied to an array of aquatic organisms. The results of his independent study research were recently published in the journal Hydrobiologia. In August 2018, Weston started medical school at Oklahoma State University (OSU)-Tulsa.
2015 Arianne Rick (B.S., U. of Oklahoma, OU Honors College) (started dental school at the U. of Florida in fall 2017)
2011-13 Jeff Medders (B.S., U. of Oklahoma)
2012-13 Alex Mutz (B.S., U. of Oklahoma)
2011 Rosa Yorks (B.S. , Oklahoma State Univ.)
2011 Tiffany Glover (B.S., Langston Univ., Oklahoma)
2011 Garrett Schulze (Kingston High, Oklahoma)(currently applying for entry into the Oklahoma State Trooper Academy)
2011 Kelsie Montgomery (high-school student, Red River Technology Center, Oklahoma)
2010 Michael Leitch (B.S., U. of Oklahoma)
2005-06 Laura Harolds (B.S. Honors, U. of Oklahoma, UROP award winner)
2003 Andrea Bean (B.S., U. of Oklahoma)
2003 Jaime Ramos (B.S., U. of Oklahoma)
2002 Robyn Moran (B.S., S.W. Okla. State)
2002 Lynette Matthews (B.S., Arizona State U.)
2002 Amy Ramsey (B.S., Botany, U. of Oklahoma)
2001 Jeremiah Smith (B.S., U. of Oklahoma)
2001 Kim Land (B.S., U. of Oklahoma)
2000 Amanda Warren (B.S., U. of Oklahoma)
1992 Gerhard Griebe (B.Sc. honors – U. of Oldenburg, Germany)
1992 Andreas Heinken (B.Sc. – Free University – Berlin, Germany)
1992 Adrian Howe (B.Sc. – EC Comet Program, U. of Swansea, Wales)
1989-90 Catherine Delvanminck (B.Sc. honors – U. of Windsor, Canada)