John D Hatle

Professor • Physiology

Biology • College of Arts & Sciences

Areas of Expertise

Teaching Responsibilities:  General Biology 3, Anatomy and Physiology 2


Research Interests:  Effects of reproduction and diet on lifespan in insects 


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. Hence, I study the effects of reproduction on lifespan in grasshoppers and flesh flies. See my Research Web page for more information.


UNF Outstanding Faculty Scholarship Award, 2010-2011 (one of two awarded)

Grants and Contracts Awarded

NIH-R15 award to study allocation of ingested nutrients in long-lived grasshoppers. $245,000. 2010-2013. 

Publications & Presentations

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

Hatle JD*, Kellengerber JW, Viray E, Smith AM, Hahn DA (2013) Life-extending ovariectomy in grasshoppers increases somatic storage, but dietary restriction with an equivalent feeding rate does not.  Experimental Gerontology 48: 966-972.


Judd ET, Wessels FJ, Drewry MD, Grove M, Wright K, Hahn DA, Hatle JD* (2011) Ovariectomy in grasshoppers increases somatic storage, but proportional allocation of ingested nutrients to somatic tissues is unchanged. Aging Cell 10:972-979.

Drewry MD, Williams JM, Hatle JD* (2011) Life-extending dietary restriction and ovariectomy result in similar feeding rates but different physiological responses in grasshoppers. Experimental Gerontology 46:781-786 .

Wessels FJ, Kristal R, Rourke M, Hatle JD, Hahn DA* (in press) The timing of resource availability does not affect reproductive allotment or the rate of oocyte development in the flesh fly, Sarcophaga crassipalpis. Ecological Entomology. Published online. DOI: 10.1111/j.1365-2311.2011.01273.x

Wessels FJ, Kristal R, Netter F, Hatle JD, Hahn DA* (2011) Does it Pay to Delay? Flesh Flies Show Adaptive Plasticity in Reproductive Timing. Oecologia 165:311-320.

Stauffer TW, Hatle JD, Whitman DW* (2011) Divergent egg physiologies in two closely related grasshopper species: Taeniopoda eques versus Romalea microptera (Orthoptera: Romaleidae). Environmental Entomology 40:157-166.

Urian AG, Hatle JD, Gilg MR* (2011) Thermal constraints for range expansion of the invasive green mussel, Perna viridis, in the southeastern United States. Journal of Experimental Zoology A: Ecological Genetics and Physiology 315:12-21.

Judd ET1, Hatle JD*1, Drewry MD , Wessels FJ, Hahn DA (2010) Allocation of nutrients to somatic tissues in young ovariectomized grasshoppers. Integrative and Comparative Biology 50:818-828. (1equal contribution)

Hatle JD*, Oppert B (2010) Insect gut physiology and nutrition: insights into diverse systems. African Entomology 18:1-7.

Hatle JD*, Paterson CS, Jawaid I, Lentz C, Wells SM, Fronstin RB (2008) Protein accumulation underlying lifespan extension via ovariectomy in grasshoppers is consistent with the disposable soma hypothesis but is not due to dietary restriction. Experimental Gerontology 43:900-908.

Fronstin RB and Hatle JD* (2008) A cumulative feeding threshold required for vitellogenesis can be obviated with juvenile hormone treatment in lubber grasshoppers. Journal of Experimental Biology 211:79-85.

Hatle JD*, Wells S, Fuller LE, Allen IC, Gordy LJ, Melnyk S and Quattrochi J (2006) Calorie restriction and late-onset calorie restriction extend lifespan but do not alter protein storage in female grasshoppers. Mechanisms of Ageing and Development 127:883–891.

HatleContact Information

Building 59, Room 3314

(904) 620-2778


Office Hours

MW - 4-5pm and TR - 1045am-noon for spring 2012