Showing papers in "Theoretical Population Biology in 1981"

TL;DR: In this article, a regression method is introduced that uses data from well-sampled individuals whose true home ranges are assumed approximately known to predict home-range areas for less well sampled individuals, and the sizes of home ranges estimated by the regression method are half or less than sizes estimated by previous methods in which utilization distributions are assumed to be all of a particular statistical type.

TL;DR: The theory of kin selection, as developed by Hamilton, stems from the fact that in a sexually reproducing population, the genotype of a progeny of an individual is not necessarily identical to the genotypes of either parent, so natural selection cannot operate through the preservation of the most tit type.

TL;DR: In this paper, the authors studied population models which have the following three ingredients: populations are divided into local sub-populations, local population dynamics are nonlinear and random events occur locally in space.

TL;DR: In this paper, the relationship between persistent, small to moderate levels of random environmental fluctuations and limits to the similarity of competing species is studied, based on deriving conditions under which a rare invading species will tend to increase when faced with an array of resident competitors in a fluctuating environment.

TL;DR: A number of antigens of the human histocompatibility system have been shown to be associated with a wide range of chronic diseases and the development of models to determine the mode of inheritance of the disease is reviewed.

TL;DR: A model based on renewal processes is derived for the predator's net rate of energy intake, used to explore the optimal mode of search, search height, pause duration (“giving-up time”) and move length, and the following predictions emerge.

TL;DR: Hamilton (1964a, b) constructed the verbal theoretical basis of modern kin selection theory which states that potentially “altruistic” individuals evolve to value their relatives according to the closeness of their genetic relatedness.

TL;DR: General formulae for the homozygosity and variance of linkage disequilibrium are derived for neutral, stationary, two-locus multiple allele models where there is a symmetric type of mutation at each locus.

TL;DR: In this article, a population genetic model involving sister, brother, and father control of the brood sex ratio and brood size in both the haplodiploid and diploid cases is constructed and analyzed.

TL;DR: In this paper, a stochastic differential equation for a discontinuous Markov process is employed to model the magnitude of a population which grows logistically between disasters which are proportional to the current population size (density independent disasters).

TL;DR: A stochastic model is presented which incorporates predator training effects, and three types of training can result in optimal diets which do not obey the standard optimal diet rules.

TL;DR: It is hypothesized that the average rate of nectar production per flower for a population of plants is such than an individual plant which possesses this rate has maximum fitness (i.e., is optimal), and predictions concerning nectarProduction in scarlet gilia, a hummingbird pollinated plant are developed.

TL;DR: In this article, Horn's markovian model of forest succession is discussed and different domains of attraction arise when the replacement probabilities are density dependent, and explicit light-gap opening and colonization terms are introduced to make the model useful in tropical rain forests dynamics.

TL;DR: A careful consideration of all models shows that the classical models are well defined and seem to achieve their equilibria, except the model used by Feldman and Cavalli-Sforza, which involves an arbitrary assumption.

TL;DR: The theta model provides a consistently better description of population growth in these populations than the logistic model, and the results indicate that the rate of growth is affected by the genetic constitution of a population.

TL;DR: The very existence and extent of habitat selection depends critically upon the physiological capabilities of the organism, and selection directs the selective pressures back onto the physiological homeostatic capabilities.

TL;DR: Models formulated for the population dynamics of a monoecious or dioecious species with an all-female parthenogenetic sibling species which is also gynogenetic imply that extinction is highly likely in the dIOecious situation, but much less so in the monoeciously one.

TL;DR: It is concluded that the heuristic approach using “inclusive fitness” offers no substantive advantages over exact population genetic modelling.

TL;DR: It is found that the basic dynamics of the model can be determined by a knowledge of the slope of the net reproduction rate at the equilibrium, and the situation usually described as “chaos” is likely to be less prevalent than earlier studies of first and second order difference equations have suggested.

TL;DR: A model of speciation is constructed in which two equally fit but cross-sterile interbreeding species W and C meet in a zone of overlap Z, and a mutation arises which causes a partial aversion to individuals of type C.

TL;DR: In this paper, a two-locus model is presented which shows the possibility of maintaining a polymorphism for modifiers of sex-linked meiotic drive in the absence of fitness differences.

TL;DR: The detection problem introduced by Robertson (1978) concerns the time taken to form the first recessive homozygote in finite populations and the effect of partial detection, resulting from a screening program that can in some cases detect the presence of the a-allele in heterozygous form is studied.

TL;DR: The concept of sufficient ecological differences between coexisting species has been repeatedly discussed and its implications for community structure and dynamics has been vigorously explored as mentioned in this paper, but without a reliable technique for quantitatively measuring competition intensity among real populations, the use of existing data to test existing theory is often difficult or of questionable value.

TL;DR: Models for the joint dynamics of predators and prey, maintained in continuous flow chemostat culture, are presented and it is shown that the joint coexistence of all components requires 0 ⩽ NI − NH⩽ NJ.

TL;DR: It is shown by considering the realised fecundities of the two types of males, at different frequencies in the population, that protected polymorphism for a locus controlling the male type is possible, however, it requires strong sexual selection and a distribution of group sizes with a high variance.

TL;DR: In this paper, the authors investigate various aspects of the dynamics of a population for which density independent factors are predominant and identify those features of environmental perturbations that are most important for population dynamics.

TL;DR: In this article, a continuous model for population cycles developed by Frauenthal is extended to provide further insights into damping and persistence, and the results imply that cycles in American and other Western fertility since the depression, if present, have been stabilizing in their effects.