Animal Behavior Grad Group - Faculty Profile

Home Prospective Students Continuing Students Contributions
Faculty Members Graduate Students Administration

Ann Hedrick Associate Adjunct Professor of Biology Neurobiology, Physiology, and Behavior (College of Biological Sciences) 1011 Life Sciences Office (530) 754-7611 Lab avhedrick@ucdavis.edu
Mate choice and sexual selection; antipredator behavior; genetic basis for individual differences in behavior; correlations among functionally different behavioral traits.

Degrees:
1987 - PhD - University of California, Davis - Zoology
1984 - MS - University of California, Davis - Zoology
1977 - BA - University of Virginia - Biology

Department and Center Affiliations:
Neurobiology, Physiology & Behavior

Professional Societies:
Animal Behavior Society
International Society for Behavioral Ecology
Society for the Study of Evolution

Grad Group Affiliations and Specialties:
Animal Behavior

Publications:
Kortet, R. & A. Hedrick. 2007. A behavioural syndrome in the field cricket Gryllus integer: intrasexual aggression is correlated with activity in a novel environment. Biological Journal of the Linnean Society 91: 475-482.

Kortet, R., M.J. Rantala & A. Hedrick. 2007. Boldness in anti-predator behavior and immune defense in field crickets. Evolutionary Ecology Research 9: 185-197.

Hedrick, A.V., M. Hisada & B. Mulloney. 2007. Tama-kugel: Hardware and software for measuring direction, distance and velocity of locomotion by insects. Journal of Neuroscience Methods 164: 86-92.

Hedrick, A.V. & R.K. Kortet. 2006. Hiding behaviour in two cricket populations that differ in predation pressure. Animal Behaviour 72: 1111-1118.

Hedrick, A.V. 2005. Environmental condition-dependent effects on a heritable, preferred male trait in the field cricket, Gryllus integer. Animal Behaviour 70:1121-1124.

Kortet, R.K. & A.V. Hedrick. 2005. The scent of dominance: female field crickets use odor to predict the outcome of male competition. Behavioral Ecology & Sociobiology 59: 77-83.

Kortet, R.K. & A.V. Hedrick. 2004. Detection of the spider predator, Hololena nedra by naive juvenile field crickets using indirect cues. Behaviour 141: 1189-1196.

Hedrick, A.V. & B. Mulloney. 2004. A multichannel electronic monitor of acoustic behaviors, and software to parse individual channels. Journal of Neuroscience Methods 133: 201-210.

Hedrick, A.V., D. Perez, N. Lichti & J. Yew. 2002. Temperature preferences of male field crickets (Gryllus integer) alter their mating calls. Journal of Comparative Physiology A 188: 799-805.

Hedrick, AV. 2000. Crickets with extravagant mating songs compensate for predation risk with extra caution. Proceedings, Royal Society of London B. 267:671-675

Dill LM, Hedrick AV and A Fraser. 1999. Male mating strategies under predation risk: do females call the shots?. Behavioural Ecology. 10:452-461

Hedrick, A.V. and T. Weber. 1998. Variance in female responses to the fine structure of male song in the field cricket, Gryllus integer. Behavioral Ecology. 9:582-591

Hedrick, A.V. 1994. The heritability of mate-attractive traits: a case study on field crickets. pp. 228-250 in C. Boake, ed. Quantitative genetic studies of behavioral evolution. University of Chicago Press.

Hedrick A.V. & L.M. Dill. 1993. Mate choice by female crickets is influenced by predation risk. Animal Behaviour 46: 193-196.

Riechert, S.E. & A. V. Hedrick 1993. A test for correlations among fitness-linked behavioural traits in the spider Agelenopsis aperta (Aranae, Agelenidae). Animal Behaviour 46: 669-675.

Riechert S.E. & A. V. Hedrick. 1990. Levels of predation and genetically based anti-predator behaviour in the spider, Agelenopsis aperta. Animal Behaviour 40: 679-687.

Hedrick, A.V. & S.E. Riechert. 1989. Genetically-based differences between populations in the foraging behavior of a spider. Oecologia 80: 533-539.

Hedrick A.V. & E.J. Temeles. 1989. The evolution of sexual dimorphism in animals: hypotheses and tests. Trends in Ecology and Evolution 4: 136-138.

Hedrick, A.V. 1988. Female choice and the heritability of attractive male traits: an empirical study. American Naturalist 132: 267-276.

Hedrick, A.V. 1986. Female preferences for male calling bout duration in a field cricket. Behavioral Ecology and Sociobiology 19: 73-77.

Research Interests:
My research program focuses on the evolution of behavior, particularly the evolution of mating behavior. I am especially interested in the interplay between sexual selection and natural selection. My research falls into three general areas of inquiry: (1) Studies of individual variation in mating preferences, (2) Investigating links between mating behavior and anti-predator behavior, and (3) Measuring correlations between different behavioral traits. For these studies, I am using the field cricket, Gryllus integer. In this species, males call to attract females using a rapid trill, and females generally prefer males with longer durations of uninterrupted trilling (calling bouts) to those with shorter calling bouts. Calling-bout length is a heritable trait in males. I am now investigating causes for differences in mating selectivity among females, mating behavior and anti-predator behavior in populations that differ in predation, and correlations among functionally different behavioral traits ("behavioral syndromes"). This work is supported by a grant from the National Science Foundation (IOS-0716332).

Laboratory Personnel:
Hedrick Laboratory - Ann Hedrick, P.I., Anne Leonard, Jamie Bunting, Robert Hua

Field Sites:
California, Arizona

Teaching Interests:

Animal behavior.

Courses Taught:
NPB 102 Animal Behavior
NPB 90C Current Topics in Animal Behavior - Term(s): Winter
NPB 159 Frontiers in Animal Behavior - Term(s): Spring