Now showing items 1-20 of 48

    • Behavioral thermoregulation in lizards: importance of associated costs 

      Huey, Raymond B. (American Association for the Advancement of Science, 1974-05-31)
      The Puerto Rican lizard Anolis cristatellus behaviorally regulates body temperature in an open habitat but passively tolerates lower and more variable temperatures in an adjacent forest where basking sites are few and ...
    • Latitudinal pattern of between-altitude faunal similarity: mountains might be "higher" in the tropics 

      Huey, Raymond B. (The University of Chicago, 1978-01)
      Moving up or down a mountain from a given site, one encounters faunas that differ by varying degrees. The elevational separation between sites obviously influences the magnitude of that difference (faunal similarity is ...
    • Ecological consequences of foraging mode 

      Huey, Raymond B.; Pianka, Eric R. (Ecological Society of America, 1981-08)
      Desert lizards are typically either widely foraging or sit-and-wait predators, and these foraging modes are correlated with major differences in ecology. Foraging mode is related to the type of prey eaten by lizards. Widely ...
    • Hot rocks and not-so-hot rocks: retreat-site selection by garter snakes and its thermal consequences 

      Huey, Raymond B.; Peterson, Charles R.; Arnold, Stevan J.; Porter, Warren P. (Ecological Society of America, 1989-08)
      Studies of behavioral thermoregulation of ectotherms have typically focused only on active animals. However, most temperate-zone ectotherms actually spend more time sequestered in retreats (e.g., under rocks) than active ...
    • Evaluating temperature regulation by field-active ectotherms: the fallacy of the inappropriate question 

      Hertz, Paul E.; Huey, Raymond B.; Stevenson, R. D. (University of Chicago, 1993-11)
      We describe a research protocol for evaluating temperature regulation from data on small field-active ectothermic animals, especially lizards. The protocol requires data on body temperatures (Tb) of field-active ectotherms, ...
    • Multiple Mating, Sperm Competition, and Meiotic Drive 

      Haig, David; Bergstrom, Carl T. (Blackwell Publishing LTD, 1995)
      Most discussions of "sperm competition" have ignored the potential for competition among the different sperm genotypes present in the ejaculate of a single male. Rivalry within ejaculates may limit cooperation among the ...
    • Signalling Among Relatives. I. When is signalling too costly? 

      Bergstrom, Carl T.; Lachmann, Michael (The Royal Society, 1997)
      Zahavi's handicap principle, originally proposed as an explanation for sexual selection of elaborate male traits (Zahavi, 1975) suggests that signalling can be honest if less desirable signallers must pay a higher cost in ...
    • Signalling among relatives. II. Beyond the Tower of Babel. 

      Bergstrom, Carl T.; Lachmann, Michael (Academic Press INC Elsevier Science, 1998)
      Models of costly signalling are commonly employed in evolutionary biology in order to explain how honest communication between individuals with conflicting interests can be stable. These models have focused primarily on a ...
    • Pure versus mixed strategists: the evolution of behavioral heterogeneity in individuals and populations 

      Bergstrom, Carl T.; Godfrey-Smith, Peter (Kluwer Academic Publishers, 1998)
      A wide range of ecological and evolutionary models predict variety in phenotype or behavior when a population is at equilibrium. This heterogeneity can be realized in different ways. For example, it can be realized through ...
    • Signalling Among Relatives. III. Talk is cheap. 

      Bergstrom, Carl T.; Lachmann, Michael (National Academy of Sciences, 1998-04)
      The Sir Philip Sidney game has been used by numerous authors to show how signal cost can facilitate honest signaling among relatives. Here, we demonstrate that, in this game, honest cost-free signals are possible as well, ...
    • Germline bottlenecks and the evolutionary maintenance of mitochondrial genomes 

      Bergstrom, Carl T.; Pritchard, Jonathan K. (Genetics, 1998-08)
      Several features of the biology of mitochondria suggest that mitochondria might be susceptible to Muller’s ratchet and other forms of evolutionary degradation: Mitochondria have predominantly uniparental inheritance, appear ...
    • Does Mother Nature Punish Rotten Kids? 

      Bergstrom, Carl T.; Bergstrom, Theodore C. (Kluwer Academic Publishers, 1999)
      The theory of parent-offspring conflict predicts that mothers and their offspring may not agree about how resources should be allocated among family members. An offspring, for example, may favor a later weaning date than ...
    • Risky business: Sexual and asexual reproduction in variable environments 

      Robson, Arthur J.; Bergstrom, Carl T.; Pritchard, Jonathan K. (Academic Press LTD Elsevier Scientific LTD, 1999)
      Patterns of reproductive uncertainty can have an important influence on population dynamics. There is a crucial distinction between what we describe here as aggregate uncertainty (in which reproductive output in each ...
    • Transmission bottlenecks as determinants of virulence in rapidly evolving pathogens 

      Bergstrom, Carl T.; McElhany, Paul; Real, Leslie A. (National Academy of the Sciences, 1999-04)
      Transmission bottlenecks occur in pathogen populations when only a few individual pathogens are transmitted from one infected host to another in the initiation of a new infection. Transmission bottlenecks can dramatically ...
    • Toward a theory of mutual mate choice: Lessons from two-sided matching 

      Bergstrom, Carl T.; Real, Leslie A. (Evolutionary Ecology LTD, 2000)
      Theoretical models of mate choice and sexual selection typically make one of two simplifying assumptions. Either mate-preferences are assumed to be uniform (e.g., all females have the same preferences with respect to males), ...
    • Epidemiology of antibiotic resistance in hospitals: paradoxes and prescriptions 

      Lipsitch, Marc; Bergstrom, Carl T.; Levin, Bruce R. (National Academy of Sciences, 2000-02-15)
      A simple mathematical model of bacterial transmission within a hospital was used to study the effects of measures to control nosocomial transmission of bacteria and reduce antimicrobial resistance in nosocomial pathogens. ...
    • Bacteria are different: Observations, interpretations, speculations, and opinions about the mechanisms of adaptive evolution in prokaryotes 

      Levin, Bruce R.; Bergstrom, Carl T. (National Academy of the Sciences, 2000-06-20)
      To some extent, the genetical theory of adaptive evolution in bacteria is a simple extension of that developed for sexually reproducing eukaryotes. In other, fundamental, ways the process of adaptive evolution in bacteria ...
    • Supplemental oxygen and mountaineer death rates on Everest and K2 

      Huey, Raymond B.; Eguskitza, Xavier (American Medical Association, 2000-07-12)
      The use of supplemental oxygen by Himalayan mountaineers has been debated for more than 8 decades. Although sometimes viewed as unsporting, supplemental-oxygen use may improve survival rates by increasing performance and ...
    • Natural selection, infectious transfer, and the existence conditions for bacterial plasmids 

      Bergstrom, Carl T.; Lipsitch, Marc; Levin, Bruce R. (Genetics, 2000-08)
      Despite the near-ubiquity of plasmids in bacterial populations and the profound contribution of plasmid-borne genes and infectious gene transfer to the adaptation and evolution of bacteria, the mechanisms responsible for ...
    • Alarm calls as costly signals of anti-predator vigilance: The Watchful Babbler game 

      Bergstrom, Carl T.; Lachmann, Michael (Academic Press LTD Elsevier Science LTD, 2001)
      Alarm-calling behavior is common in many species that suffer from predation. While kin selection or reciprocal altruism are typically invoked to explain such behaviors, several authors have conjectured that some alarm calls ...