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Dr. Thomas M. Clark

Dr. Thomas M. Clark
  • Associate Professor of Comparative Physiology & Entomology
  • B.S. Louisiana State University (1985)
  • M.S. University of Southwestern Louisiana (1989)
  • Ph.D. University of California, Irvine (1994)
  • Office: Northside 128D
  • Phone: 574-520-4882
  • Email: tclark2 AT iusb.edu

Research

My research interests are in the fields of comparative physiology, entomology, and insect physiology.  Much of my work has addressed the physiology of mosquitoes.  These insects are by far the most important arthropod disease vectors, responsible for millions of human deaths each year.  My work in mosquitoes ranges from such phenomena as the effects of ambient salinity and pH on growth, development, and energy expenditures, to endocrine and neural regulation of midgut function and hemolymph composition, and plasticity of function of individual organs and tissues in response to media differing in ionic composition and pH.  Another study, in collaboration with Dr. Remold of the University of Louisville, addresses the interaction of mosquitoes and dengue virus. I have also recently begun to investigate the anatomy and physiology of larvae of the midge Chaoborus.  This aquatic predator is quite different from mosquito larvae, and shows many interesting adaptations

 

Publications

Clark T.M., Vieira M.A.L., Huegel K.L., Flury D., and Carper M. (2007). Strategies for regulation of hemolymph pH in acidic and alkaline water by the larval mosquito Aedes aegypti (L.)(Diptera; Culicidae). J. Exp. Biol. 210, 4359-4367.

Clark T.M., Hutchinson M.J., Huegel K.L., Moffett S.B., Moffett D.F. (2005). Additional morphological and physiological heterogeneity within the midgut of larval Aedes aegypti (Diptera: Culicidae) revealed by histology, electrophysiology, and effects of Bacillus thuringiensis endotoxin. Tissue and Cell 37, pp. 457-468.

Clark T.M., Flis B.J., and Remold S.K. (2004). Differences in the effects of salinity on larval growth and developmental programs of a freshwater and a euryhaline mosquito species (Insecta: Diptera, Culicidae). J. Exp. Biol. 207, pp. 2289-2295.

Clark T.M., Flis B.J., and Remold S.K. (2004). pH tolerances and regulatory abilities of freshwater and euryhaline Aedes mosquito larvae (Insecta: Diptera, Culicidae). J. Exp. Biol. 207, 2297-2304.

Clark T.M., Koch A., and Moffett D.F. (2000). The electrical properties of the anterior stomach of the larval mosquito (Aedes aegypti). J. Exp. Biol. 203: 1093-1101.

Clark T.M. (1999). The evolution and adaptive significance of larval midgut alkalinization in the insect superorder Mecopterida. J. Chem. Ecol. 25(8): 1945-1960.

Clark T.M., Koch A., and Moffett D.F. (1999). The anterior and posterior “stomach” regions of larval Aedes midgut: regional specialization of ion transport and stimulation by 5-HT. J. Exp. Biol. 202: 247-252.

Clark T.M., Koch A., and Moffett D.F. (1998). Alkalinization by Manduca sexta anterior midgut: requirements and characteristics. Comp. Biochem. Physiol.: A 121, 181-187.

Clark T.M., Hayes T.K., Holman G.M., and Beyenbach K.W. (1998). The concentration dependence of CRF-like diuretic peptide: mechanisms of action.  J. exp. Biol. 201: 1753-1762.

Clark T.M., Hayes T.K., and Beyenbach K.W. (1998). Dose-dependent effects of CRF-like diuretic peptide on transcellular and paracellular pathways in insect Malpighian tubules. Am. J. Physiol. 274: F834-F840

Clark T.M., and Bradley T.J. (1998). Additive effects of 5-HT and diuretic peptide on Aedes Malpighian tubule fluid secretion. Comp. Biochem. Physiol. 119A, 599-605.

Clark T.M., and Bradley T.J.  (1997). Malpighian tubules of larval Aedes aegypti are hormonally stimulated by 5-hydroxytryptamine in response to increased salinity. Arch. Insect Biochem. Physiol. 34:123-141.

Clark T.M., and Bradley T.J. (1996). Stimulation of Malpighian tubules from larval Aedes aegypti by secretagogues. J. Insect Physiol. 42: 593-602.

Clark T.M., and Spring J.H. (1992). Excretion in the house cricket: role of second messengers in Malpighian tubule function. Can. J. Zool. 70: 1347-1353.

Spring J.H., and Clark T.M. (1990). Diuretic and antidiuretic factors which act on the Malpighian tubules of the house cricket, Acheta domesticus. Progress in Clinical and Biological Research 342: 559-564.

Book Chapters

Clark T.M. (2003). Water Balance, Hormonal Control of.  In: The Encyclopedia of Insects.  Ed. Resh and Cardé. Academic Press.

Clark T.M. (2008). Water Balance, Hormonal Control of.  In: The Encyclopedia of Insects, 2ND ed., revised.  Ed. Resh and Cardé. Academic Press.

Scholarly presentations

Clark, T.M., Lawecki J., Huegel K.L., Vieira M.A.L., McLister J., Carper M. (2006). Novel mechanisms for regulation of hemolymph pH in the larval mosquito Aedes aegypti. Entomological Society of America, annual meeting, Indianapolis, IN.        

Clark, T.M., Lawecki J.L., and Hirschler A.N. (2004). Actions of the serotonin-selective reuptake inhibitor alaproclate in the larval mosquito: does serotonin regulate hemolymph pH? Society for Integrative and Comparative Biology, New Orleans, LA.

Clark T.M., Flis B.J. (2003). Identical pH tolerances of saline water and freshwater Aedes mosquito larvae. Society for Integrative and Comparative Biology, Toronto, Ontario, CA.

Clark T.M. (2003). Actions of serotonin on the posterior stomach of larval Aedes aegypti.  Society for Integrative and Comparative Biology, Toronto, Ontario, CA.

Clark T.M., Flis B.J., and Remold, S.R. (2002). Effects of salinity and pH on life-history parameters of larval Aedes mosquitoes (Insecta: Diptera).  Entomological Society of America, E. Lansing MI.

Clark T.M. and Flis B.J. (2002). Physiological aspects of the broad pH tolerance of larval Aedes aegypti (Insecta: Diptera). Entomological Society of America, E. Lansing MI.

Clark, T.M. (2001). Integrative aspects of epithelial transport in larval Aedes aegypti.  Society for Integrative and Comparative Biology annual meeting; Symposium  "Integrative aspects of epithelial structure and function (A tribute to John Phillips). Chicago, Il.

Clark, T.M., Hutchinson M.J., Moffett D.F. (2001). Apical surface morphology of the stomach region of the larval mosquito midgut.  Society for Integrative and Comparative Biology annual meeting, Chicago, Il.

Clark T.M., Koch A.R., and Moffett D.F. (1999). Stimulation by 5-HT of region-specific ion transport processes in larval mosquito midgut that are independent of V-ATPase and Na/K-ATPase. Society for Integrative and Comparative Biology, Chicago, Ill. Am. Zool. 38, Abstract # 404, pg. 116A.

Moffett D.F., Clark T.M., and Koch A.R. (1999). Lepidopteran gut alkali secretion is stimulated by endogenous modulator and low magnesium. Am. Zool. 38, Abstract # 416, pg. 119A.

Clark T.M. (1998). The evolution and adaptive significance of larval midgut alkalinization in the insect superorder Mecopterida. Entomological Society of America annual meeting.

Clark, T.M., Koch, A.R., and Moffett D.F. (1998). Electrophysiological behavior of isolated anterior and posterior stomach regions of larval Aedes midgut. Am. Zool. 37, Abstract # 505, pg. 142A.

Beyenbach K.W., Clark T.M., and Hayes T.K. (1996). Mechanism of action of CCRF-like diuretic peptide: stimulation of two intracellular signal pathways.  Proc. XX Intl. Congr. Entomol., Abstract # 05-121, pg. 184.

Clark T.M. (1993). Evidence for hormonal control of Malpighian tubules in larval Aedes aegypti. Intl. Symp. Mol. Insect Sci.,  2, 40.

Clark T.M. and Bradley T.J. (1993). Short term changes in hemolymph properties of larval Aedes aegypti in response to physiological challenges affect Malpighian tubule secretion rates in vitro. Am. Zool. 33(5): 43A.

Clark T.M. and Bradley T.J. (1992). Tissue extracts stimulate fluid secretion by larval Aedes aegypti Malpighian tubules. Am. Zool. 32(5): 49A.

Spring J.H., Clark T.M., and Kim I.S. (1990). Effects of HPLC-purified hormones and second messengers on secretion by the Malpighian tubules of the cricket, Acheta domesticus. Southwest Regional Conference on Experimental Endocrinology, Texas A&M University.

Clark T.M. and Spring J.H. (1988). The role of second messengers in stimulation of secretion by Malpighian tubules of the house cricket. Am. Zool. 28(4): 108A.

Invited seminars

Clark, T.M. (2003). Regulation of insect hemolymph composition. University of Akron, Department of Biology.

Clark, T.M. (2001). Integrative and regulatory aspects of insect epithelial transport.  University of Illinois, Department of Entomology.

Clark, T.M. (2001). Integrative aspects of epithelial transport in larval Aedes aegypti.  Society for Integrative and Comparative Biology annual meeting; Symposium  "Integrative aspects of epithelial structure and function (A tribute to John Phillips). Chicago, Il.

Clark, T.M. (1999). Ecological, evolutionary, and comparative aspects of insect midgut physiology. John Carroll University.