Teaching -- philosophy.

Links to course materials:

Research -- description and free computational tools for zero-crossing data analysis

Favorite Web Links

Contact Information
Office: O'Neil 108
Spring 2010 office hours:

Labs: O'Neil 104 & O'Neil 206
Email:kprestwi@holycross.edu
Phone: (508) 793-2578 (Office and Labs)
(508) 793-2656 (Department)
FAX: (508) 793-2696

last updated 1 February , 2010 -- best viewed at screen res = 1024 X 768

Teaching

My principal goals are to teach students to think about the ways that biological systems both function and interact with each other and their environment. This approach is consistent with my main areas of research -- physiology looks at interacting systems within the organism or at how these represent adaptation to particular environments and behavior can be studied mechanistically (how is it produced) and/or in terms of how it adapts an animal to its environment.

My approach to teaching is to minimize note taking by providing students with a nearly complete set of course notes. This allows us to devote more class time to discussion. The methods I use require students to be active learners who remain current with the course materials.

Course materials that I have developed can be found using the links below; they are free for anyone's use of modification provided they are not sold.

Course Websites and Other Web-Based Teaching Materials:

Research

Frequency analysis using zero-crossing, a free program (Macintosh)

Photo: mating in A. arboreus -- the male continues to sing as he passes a spermatophore to the female.               Photo ar Right: A male Anurogryllus arboreus about to begin calling for a mate. If you have an audio-enabled browser, click on the cricket's photo and hear a short example of its song.

My research takes two directions. The first involves the studies of the importance of energy in acoustic communication in animals. In particular, I am interested in the what are often termed "mating calls". These calls, which are generally produced only by males, are often very loud and are produced at a high rate over a long period of time. I have been able to show that such calls are very expensive energetically. In ectothermic ("cold-blooded") animals such as many insects and frogs, the expense of producing these calls rivals or exceeds that of terrestrial locomotion. Besides looking at the metabolic energy required to produce such calls, I have also looked at the acoustic energy in the call and have been able to determine that animals do not change their metabolic energy into sound very efficiently. For instance, efficiency of locomotion such as walking, running, swimming or flying is typically 10 to 20% while the efficiency of sound production is generally less than 1%. This discovery has led me and my students to investigate anatomical factors which actually determine the efficiency of sound production -- for instance features of the forewings of crickets

My other area of interest is in understanding the limitations of the locomotory system of spiders. Spiders are superbly adapted predators. Their hunting styles vary from ambush, to cornering prey in burrows, to active pursuit and, of course, to the use of a bewildering variety of webs. Each species has its own particular morphological, physiological and behavioral traits that correlate the type of prey capture it uses. In my lab we look at the energetic consequences of these different approaches to prey capture. For instance, we have studied the amount of energy required to build different types of webs. We have tried to estimate the amount of energy required to capture different types of prey using different methods.

We are especially interested in understanding the limits (constraints) imposed on a spider's ability to move about rapidly. We compare species in terms of the their oxygen consumption, heart rates, and anaerobic and phosphagen metabolism during different types of exercise and recovery from that exercise. The ultimate goal of these studies are to (i) better understand some of the adaptations that spiders possess and relate these to similar predators in an attempt to understand the selective factors associated with various predatory patterns, and, (ii) come to a better understanding of the evolution of locomotory systems.

Photo:This is one of my spider subjects -- a wolf spider, Hogna lenta. Its body is about 2 cm long.

Recent Research Students

The Bear's Recent and/or Best
Most Available as E-prints (pdf)

Prestwich, K. N. 2007. Measuring the efficiency of sound production. Physiol Biochem Zool. 80, 157-165.

Prestwich, K. N. 2006. Anaerobic Metabolism and Maximal Running  in the Scorpion Centruroides  hentzi  (Banks) (Scorpiones, Buthidae). J. Arachnology 34,351-356.

Prestwich, K. N. and O'Sullivan, K. 2005. Simultaneous measurement of metabolic and acoustic power and the efficiency of sound production in two mole cricket species (Orthoptera: Gryllotalpidae). J. Exp. Biol. 208, 1495-1512.

Hung, Y. P. and K. N. Prestwich. 2005. Is significant acoustic energy found in audible and ultrasound harmonics of the carrier frequency in ensiferan calling songs? J. Orthoptera Res. 13, 63-71.

Prestwich, K. N., Lenihan, K. M. , and Martin, D. M. 2000. The control of carrier frequency in cricket calls: a refutation of the subalar-tegminal resonance/auditory feedback model. J. Exp. Biol. 203, 585-596.

Prestwich, K.N. 1994. Energy and constraints on acoustic communication in insects and anurans. American Zoologist 34(6): 625-643.

Prestwich, K.N., K. E. Brugger, and M. Topping. 1989. Energy and communication in three species of hylid frogs: power input, power output and efficiency. J. Exp. Biol. 144: 53-80.

Prestwich, K.N. 1988a. The constraints on maximal activity in spiders, I. Evidence against the hydraulic insufficiency hypothesis. J. Comp. Physiol. B. 158: 437-447.

Prestwich, K.N. 1988b. The constraints on maximal activity in spiders, II. Limitations imposed by phosphagen depletion and anaerobic metabolism. J. Comp. Physiol. B. 158: 449-456.

Anderson, J.F., and K. N. Prestwich. 1985. The physiology of exercise at and above maximal aerobic capacity in a theraphosid (tarantula) spider Brachypelma smithii. J. Comp. Physiol. 155: 529-539.

Prestwich, K. N. 1983a. Anaerobic metabolism in spiders. Physiol. Zool. 56:112-121

Prestwich, K. N. 1983b. The roles of aerobic and anaerobic metabolism in active spiders. Physiol. Zool. 56:122-132

Anderson, J.F. and K.N. Prestwich. Respiratory gas exchange in spiders. Physiol. Zool. 55:72-90.

Prestwich, K. N. and T. J. Walker. 1981. Energetics of singing in crickets: Effects of temperature in three trilling species (Orthoptera: Gryllidae). J. Comp. Physiol. 143:199-212

Anderson, J. F. and K. N. Prestwich. 1980. Scaling of subunit structures in book lungs of spiders (Araneae). J. Morph. 165: 167-174.

Prestwich, K. N. 1977. The energetics of web-building in spiders. Comp. Biochem. Physiol. 57A:321-326.

Anderson, J. F. and K. N. Prestwich. 1975. The fluid pressure pumps of spiders (Chelicerata, Araneae). Z. Morph. Tiere 81:257-277.

Some of My Favorite Websites:

Sea Turtle Conservation:

Dr. Jeanne A. Mortimer's Scholarly Publications -- publications and reports by an important sea turtle conservation biologist (and long-time friend!)

Professional Societies ( I am pleased to belong to these organizations):

The American Arachnological Society -- links to many websites dealing with spiders and arachnids, listings of opportunities for graduate studies in arachnology.

The Animal Behavior Society (ABS) - includes information on animal behavior and teaching

The Society for Conservation Biology (SCB) -- includes resources for students and those interested in biological conservation

The Society for Integrative and Comparative Biology (SICB) -- mostly society information, for nonmembers there is a page of useful links.

The Orthopterists' Society: taxonomic and other information about orthopterans presented by the International Orthopterists' Society

My home away from home:

University of Florida Entomology and Nematology Department

Science and Natural History:

The singing insects of North America: photos, distribution maps, bibliographies, and best of all, recordings of songs.

Cornell Lab of Ornithology Bioacoustics Research Program: about birds and bioacoustics in general

Massachusetts snakes

Habitat Restoration: The University of Florida's Natural Area Teaching Laboratory (NATL). See where I spend some of my spare time "doing forestry" while Gainesville in the early summer for mostly research purposes. This is an area of the UF campus that is being restored as a long-leaf pine community.

Florida Entomologist (On-Line): an excellent example of a fully on-line journal (also available in print).

An Example of an On-Line Textbook: Integrated Pest Management textbook that is entirely on line, including an explanation of the project.

Photo: KP attempts to get around some of the problems of scale -- unfortunately this is a grasshopper, not a big cricket. (Boston Museum of Science display).

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