This volume contains the Proceedings of the International Conference in Population Biology held at The University of Alberta, Edmonton, Canada from June 22 to June 30, 1982. The Conference was sponsored by The University of Alberta and The Canadian Applied Mathematics Society, and overlapped with the summer meeting of CAMS. The main objectives of this Conference were: to bring mathematicians and biologists together so that they may interact for their mutual benefit; to bring those researchers interested in modelling in ecology and those interested in modelling in genetics together; to bring in keynote speakers in the delineated areas; to have sessions of contributed papers; and to present the opportunity for researchers to conduct workshops. With the exception of the last one, the objec­ tives were carried out. In order to lend some focus to the Conference, the following themes were adopted: models of species growth, predator-prey, competition, mutualism, food webs, dispersion, age structure, stability, evolution of ecological parameters, evolution of behaviour, life history strategies, group and social selection, and evolution of genetic systems. There were speakers (invited and/or contributed papers) in each of these areas. Talks were given on Tuesday, June 22 to Friday, June 25 and on Monday, June 28 to Wednesday, June 30. On each day there were several talks by the principal speakers as well as contributed sessions. Altogether, there were ninety­ one papers given, of which twelve were by the principal speakers. There were one hundred and twenty-three registered participants from twelve different countries.

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I Population Genetics.- The Use of Coefficients of Identity to Study Random Drift.- Instability and Repulsivity of the Fixation States in Biallelic Selection Models.- Microscopic Clustering of Population Processes.- Models for Peripheral Populations: The Role of Immigration.- A Mathematical Analysis of the Chitty Hypothesis.- An Haploid Model for Genotype-Dependent Population Diffusion.- Further Models of Selection with Antagonistic Pleiotropy.- Algebraic Methods in Genetics.- II Life History Strategies.- The Evolution of Life Histories Under Pleiotropic Constraints and K-Selection.- On the r-K Tradeoff in Density Dependent Selection.- A Test of Ideas About the Evolution of Efficiencies and Strategies of Resource Use.- Compensatory Strategies of Energy Investment in Uncertain Environments.- A Geometric Model for Optimal Life History.- Necessary Conditions for an Invasion Proof Strategy.- The Evolution of Stable Strategies.- III Population Growth.- Forecasting the Human Population.- Persistence in Uncertain Environments.- Formulating Population Models with Differential Aging.- Population Modelling by Higher Order Differential Equations.- Concerning the Time-Dependence of Population Vital Rates.- Extinction Probabilities in Stochastic Age-Structured Models of Population Growth.- The Systematic Formulation of Delay-Differential Models of Age or Size Structured Populations.- Lotka Distribution for a Finite Mixture of Human Populations I.- A Problem in Nonlinear Age Dependent Population Diffusion.- IV Competitive Systems.- Coexistence of Competitors in a Stochastic Environment: The Storage Effect.- Invited Guest Lecture: Models of Competition for a Single Resource.- Competitive Predator-Prey Systems and Coexistence.- Coexistence of Many Competing Species.- Competition and Age-Structure.- Selection of Molecular Species by Competition for a Common Source.- An Analysis of Competition Between The Larvae of a Deposit-Feeding and a Filter-Feeding Species of Chironomid (Diptera), Using a Mechanistic Model.- V predator-Prey Systems.- Invited Guest Lecture: The Dynamics of Host-Parasitoid Interactions with Heterogeneity Host Density Dependence and Variable Sex Ratios.- Some Applications of Coherent State Representation to Nonlinear Bio-Oscillators.- Mathematical Analysis of Some Resource-PreyPredator Models: Application to a NPZ Microcosm Model.- Resonance in Prey-Predator Systems.- A Mathematical Model of Population Regulation in Cyclic Mammals.- Monotone Schemes for Three Species Prey-Predator Reaction-Diffusion.- Some Age-Structure Effects in Predator-Prey Models.- A Model Predator-Prey System with Mutual Interference and Time Delay.- Oscillations in Prey-Predator Volterra Models.- VI Community Ecology.- Coevolution.- A Coexistence Model for N-Species Using Nearest Neighbour Interaction and the Role of Diffusion.- Periodic Lotka-Volterra Systems and Time Sharing of Ecological Niches.- Nonobligate and Obligate Models of Mutualism.- Stability of Community Interaction Matrices.- Biomass Flow, Structure and Stability of Model Ecological Systems.- Is Dynamical Systems Theory the Best Way to Understand Ecosystem Stability?.- Stability in Compartmental Models.- VII Resource Management.- Invited Guest Lecture: Search Theory in Ecology and Resource Management.- Models of Pheromone Release for Pest Control in which Males Attract Females.- Age- and Size-Specific Models in the Dungeness Crab Fishery.- Harvesting Under Small Demographic Uncertainty.- Resource Recovery Time: Just How Destabilizing Is It?.- VIII Epidemology and Immunology.- Influence of Infectious Disease on the Growth of a Population with Three Genotypes.- Interaction of Antitumor Cells: Competition and Interference.- A Model for Infection.- A Cyclic Epidemic Model with Temporary Immunity and Vital Dynamics.