Ann Hedrick

Ann Hedrick

Position Title
Adjunct Professor

Department of Neurobiology, Physiology and Behavior, College of Biological Sciences

1011 Life Sciences

Profile Introduction

Animal personalities; mate choice and sexual selection; antipredator behavior; genetic basis for individual differences in behavior; correlations among functionally different behavioral traits.

Research Interests

My research program focuses on the evolution of behavior, particularly the evolution of animal personalities, mating behavior, and antipredator behavior. I am especially interested in the interplay between sexual selection and natural selection. My research falls into three general areas of inquiry: (1) Animal personality and measuring correlations between different behavioral traits; (2) Studies of individual variation in mating preferences, (3) Investigating links between mating behavior and anti-predator behavior. For this work, 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 to those with shorter durations. Call duration is a heritable trait. I am now investigating correlations among functionally different behavioral traits ("behavioral syndromes") and the genetic basis for these correlations, causes for differences in mating selectivity among females, and mating behavior and anti-predator behavior in populations that differ in predation. My work has been supported by grants from the National Science Foundation and the Academy of Finland.

Animal personality; correlations among functionally different traits; genetic basis for individual differences in behavior; mate choice and sexual selection; antipredator behavior.

Grad Group Affiliations

  • Animal Behavior

Specialties / Focus

  • Behavior Ecology and Sociobiology


  • NPB 90C Current Topics in Animal Behavior
  • NPB 159 Frontiers in Animal Behavior


  • Hedrick Laboratory
    • Ann Hedrick, P.I., Kenneth Chapin (Postdoctoral Scholar), Cameron Jones, Tinh Ton

Field Sites

  • California, Arizona

Professional Societies

  • Animal Behavior Society
  • International Society for Behavioral Ecology


  • 1977 BA (Biology) University of Virginia
  • 1984 MS (Zoology) University of California, Davis
  • 1987 PhD (Zoology) University of California, Davis


Hedrick, A. (Editor) 2017. The development of animal personality. e-book, Frontiers in Ecology and Evolution, doi:10.3389/fevo.2017.00014

DiRienzo, N. & A. Hedrick. 2014. Animal personalities and their implications for complex signaling. Current Zoology 60: 381-386.

Hedrick, A.V. & J. Bunting. 2013. An attractive male trait and aggressiveness are negatively correlated in wild field crickets, but uncorrelated in lab-reared crickets. Behavioral Ecology and Sociobiology 68: 233-238.

Hedrick, A. 2013. Family effects on anti-predator behavior in the field cricket Gryllus integer. Journal of Insect Behavior 26: 832-836.

Polkii, M., Kortet, R., Hedrick, A. & Rantala, M. 2013. Dominance is not always an honest signal of quality but females may be able to detect the dishonesty. Biology Letters 9: 20121002.

DiRienzo, N., Pruitt, J., & A.V. Hedrick Juvenile exposure to acoustic signals from conspecifics alters developmental trajectory and adult personality. Animal Behaviour 84: 861-868.

Hedrick, A.V. & R. Kortet. 2012. Effects of body size on selectivity for mating cues in different sensory modalities. Biological Journal of the Linnean Society 105: 160-168.

Hedrick, A. & R.K. Kortet. 2012. Sex differences in the repeatability of boldness over metamorphosis. Behavioral Ecology and Sociobiology 66: 407-412.

Hedrick, A. & R. Kortet. 2012. Effects of body size on selectivity for mating cues in different sensory modalities. Biological Journal of the Linnean Society 105:160-168.

Niemela P., DiRienzo N., & Hedrick, A. 2012. Predator-induced changes in the boldness of naive field crickets, Gryllus integer, depends on behavioural type. Animal Behavior 84, 129-135.

Niemela,P., Vainikka A., Hedrick, A. & Kortet R. 2011. Integrating behaviour with life history: boldness of the field cricket, Gryllus integer, during ontogeny. Functional Ecology 26: 450-456.

Kortet, R., Hedrick A.V. & Vainikka, A. 2010. Parasitism, predation and the evolution of animal personalities. Ecology Letters 13: 1449-1458.

Leonard, A.S. & A.V. Hedrick. 2010. Long-distance signals influence assessment of close range mating displays in the field cricket, Gryllus integer. Biological Journal of the Linnean Society 100: 856-865.

Leonard, A.S. & A.V. Hedrick. 2009. Single versus multiple cues in mate discrimination by males and females. Animal Behaviour 77: 151-159.

Leonard, A.S. & A.V. Hedrick. 2009. Male and female crickets use different decision rules in response to mating signals. Behavioral Ecology 20: 1175-1184.

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

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.

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.

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.

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.