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UNF Limnology Students perform field work at Lake Oneida.
Salt marsh
Oyster beds
Students and professor working with a Benthic tray
gator hatchling
entire class crossing florida creek
Two Herons

John D. Hatle

John D. Hatle Headshot


Faculty Bio




Phone: (904) 620-2778

Office: Building 59, Room 3314



Research Interests

Effects of diet on lifespan in insects


Areas of Expertise

Teaching Responsibilities: Physiology, Anatomy and Physiology 2, General Biology 3,



B.A. Luther College (1991)

Ph.D. University of Louisiana - Lafayette (1998)

Post-doc Illinois State University (1998-2003)



Physiology of aging and reproduction in insects

The regulation of lifespan is a basic question in biology, and understanding how aging occurs may have implications for health care. My lab studies the effects of diet on lifespan in grasshoppers. See my Research Web page for more information.


Selected Publications

(student co-authors underlined, corresponding author with *)


Heck MJ, Hatle JD*. (2018) Interaction of Neuropeptide F and diet levels effects carbonyl levels in grasshoppers. Experimental Gerontology.


Hatle JD*, Awan A, Nicholas J, Koch R, Vokrri JR, McCue MD, Williams CM, Davidowitz G, Hahn DA (2017) Life-extending dietary restriction and ovariectomy each increase leucine oxidation and alter leucine allocation in grasshoppers. Experimental Gerontology 96: 155-161.


Heck MJ1, Pehlivanovic M1, Purcell JU, Hahn DA, Hatle JD* (2016) Life-extending dietary restriction reduces oxidative damage of proteins in grasshoppers but does not alter allocation of ingested nitrogen to somatic tissues. J Gerontol A Biol Sci Med Sci. doi:10.1093/gerona/glw094. (1equal contribution)


Tetlak AG, Burnett JB, Hahn DA, Hatle JD* (2015) Vitellogenin RNAi and ovariectomy each increase lifespan, increase protein storage, and decrease feeding, but are not additive in grasshoppers. Biogerontology 16: 761-774.