Now showing items 69-88 of 92

  • [2008-10-22] Security of infantile attachment as assessed in the "strange situation": its study and biological intrepretation 

    Lamb, Michael E; Thompson, Ross A; Gardner, William P; Charnov, Eric; Estes, David
    We study the Ainsworth ' Strange Situation' procedure to assess attachment between infant and parent, and intrepret individual variation in terms of modern human behavioral ecology ( sociobiology)
  • [2009-11-16] Sex change and population fluctuations in Pandalid Shrimp 

    Anderson, Paul; Charnov, Eric
  • [2006-11-27] Sex change in plants: Old and new observations and new hypotheses 

    Freeman, D.C.; Harper, K.T.; Charnov, Eric
    Evidence is presented that individuals of a large number of dioecious and subdioecious plant species are able to alter their sexual state in response to changes in the ambient environment and/or changes in size or age. We ...
  • [2006-03-19] Sex ratio evolution in a variable environment 

    Charnov, Eric; Los-den Hartogh, R.L.; Jones, W.T.; van den Assem, J.
    We develop a natural selection model for sex ratio control in a spatially variable environment. Predictions of sex ratio alteration as a function of environmental change are tested in laboratory experiments with two parasitic ...
  • [2006-03-19] Sex ratio, sex change and natural selection 

    Leigh, Egbert; Charnov, Eric; Warner, Robert
    We describe the analogy between the theory of natural selection on sex ratio in newborn gonochores (which will not change sex), and on the age of sex change in sequential hermaphrodites (which are all born into one sex and ...
  • [2006-11-27] Sex ratio, sex change and natural selection. 

    Leigh, Egbert G.; Charnov, Eric; Warner, Robert R.
    We describe the analogy between the theory of natural selection on sex ratio in newborn gonochores (which will not change sex) and on the age of sex change in sequential hermaphrodites (which are all born into one sex and ...
  • [2006-03-19] Sex ratio: Adaptive response to population fluctuation in Pandalid shrimp 

    Charnov, Eric; Gotshall, Daniel; Robinson, Jack
    Pandalus jordani is a protandrus (sequential) hermaphrodite. Populations show large year-to-year variation in age composition. In response to this variation, individuals alter the age at which they change sex. This response ...
  • [2009-11-16] Sex-ratio selection in eusocial hymenoptera 

    Charnov, Eric
  • [2006-03-10] Shrimp adjust their sex ratio to fluctuating age distributions 

    Charnov, Eric; Hannah, Robert
    Long-term data sets that quantitatively confirm basic ecological theory are rare for field populations. Highly variable recruitment often causes wide temporal variation in population age distribution and basic theory for ...
  • [2011-08-23] Similarity of Mammalian Body Size across the Taxonomic Hierarchy and across Space and Time 

    Smith, Felisa A.; Brown, James H.; Haskell, John P.; Lyons, S. Kathleen; Alroy, John; Charnov, Eric L.; Dayan, Tamar; Enquist, Brian J.; Ernest, S. K. Morgan; Hadly, Elizabeth A.; Jablonski, David; Jones, Kate E.; Kaufman, Dawn M.; Marquet, Pablo A.; Maurer, Brian A.; Niklas, Karl J.; Porter, Warren P.; Roy, Kaustuv; Tiffney, Bruce; Willig, Michael R.
    Although it is commonly assumed that closely related animals are similar in body size, the degree of similarity has not been examined across the taxonomic hierarchy. Moreover, little is known about the variation or consistency ...
  • [2006-03-19] Simultaneous hermaphroditism and sexual selection 

    Charnov, Eric
    Theory about the evolution of sexual behavior in dioecious species is based on the general assumption that egg production is limited by a female's ability to garner resources to make eggs, not by a lack of sperm to fertilize ...
  • [2006-03-19] Size and temperature in the evolution of fish life histories 

    Charnov, Eric; Gillooly, James
    Body size and temperature are the two most important variables affecting nearly all biological rates and times, especially individual growth or production rates. By favoring an optimal maturation age and reproductive ...
  • [2009-11-16] Some conceptual issues in the evolution of eusociality 

    Stubblefield, Bill; Charnov, Eric
    We review natural selection for worker genes in haplodiploid organisms. We also look at how workers may act against other workers to get them to aid mom as the 'reproductive'.
  • [2006-03-19] Sperm competition and sex allocation in simultaneous hermaphrodites 

    Charnov, Eric
    Sex allocation theory is developed for hermaphrodites having frequent copulations and long-term sperm storage. Provided the sperm displacement mechanisms are similar to those known in insects, the ESS allocation to sperm ...
  • [2011-08-23] Survey of whole air data from the second airborne Biomass Burning and Lightning Experiment using principal component analysis 

    Smith, Felisa, A.; Choi, Yunsoo; Elliott, Scott; Simpson, Isobel J.; Blake, Donald R.; Colman, Jonah J.; Dubey, Manvendra K.; Meinardi, Simone; Rowland, F. Sherwood; Shirai, Tomoko
    Hydrocarbon and halocarbon measurements collected during the second airborne Biomass Burning and Lightning Experiment (BIBLE-B) were subjected to a principal component analysis (PCA), to test the capability for identifying ...
  • [2006-03-10] Thermal time: Body size, food quality and the 10C rule 

    Charnov, Eric; Gillooly, James
    Developmental rates of ectotherms (y) are often linearly related to temperature (Tc in C) within some biologically relevant range of temperatures as y = (1/S)(Tc - Tb), where Tb is the estimated temperature at zero ...
  • [2006-03-19] A trade-off invariant life-history rule for optimal offspring size 

    Charnov, Eric; Downhower, Jerry
    Optimization models have been widely and successfully used in evolutionary ecology to predict the attributes of organisms. Most such models maximize darwinian fitness (or a component of fitness) in the face of trade-offs ...
  • [2006-03-19] Trade-off-invariant rules for evolutionarily stable life histories 

    Charnov, Eric
    Optimization models have been widely and succesfully used in evolutionary ecology to predict the attributes of organisms. Most such models maximize darwinian fitness in the face of trade-offs and constraints; the numerical ...
  • [2008-10-22] Trade-off-invariant rules for evolutionarily stable life histories[readible copy] 

    Charnov, Eric
    Ro , fitness in stationary populations , is written in a very general form; some of its theoretical implications are discussed.
  • [2006-11-27] Vole population cycles: A case for kin selection? 

    Charnov, Eric; Finerty, J.P.
    Kin selection, as evidenced by aggression between individuals with a low coefficient of relation, may be a significant contributing factor in vole population cycles. Demographic and behavioral studies support this idea.