نتایج جستجو برای: population size

تعداد نتایج: 1199768  

Journal: :Journal of population economics 1993
Y Spiegel

"In this paper, I examine the implications of the Rawlsian maximin criterion for optimal population size and intergenerational allocation of resource when fertility is endogenous. I show that whenever children are better-off than their parents in laissez-faire, then the size of the population and parental bequests are also optimal according to the Rawlsian criterion....I then show that by usi...

2008
CRAIG GUYER

All monitoring programs are designed to detect change in population size. Some require, in addition, estimates of population size itself. Two approaches to making such estimates, using various m ark-recapture methods or removal sampling, are described in this chapter. Whatever the method, estimation of population size requires extensive data collection and analysis and is labor-intensive and ti...

Journal: :Journal of Applied Mathematics and Stochastic Analysis 1996

2013
Robert M. Dorazio

In capture-recapture and mark-resight surveys, movements of individuals both within and between sampling periods can alter the susceptibility of individuals to detection over the region of sampling. In these circumstances spatially explicit capture-recapture (SECR) models, which incorporate the observed locations of individuals, allow population density and abundance to be estimated while accou...

Journal: :Evolution; international journal of organic evolution 1998
Rasmus Nielsen Joanna L Mountain John P Huelsenbeck Montgomery Slatkin

In this paper we present a method for estimating population divergence times by maximum likelihood in models without mutation. The maximum-likelihood estimator is compared to a commonly applied estimator based on Wright's FST statistic. Simulations suggest that the maximum-likelihood estimator is less biased and has a lower variance than the FST -based estimator. The maximum-likelihood estimato...

Journal: :Annals of botany 2012
Tomás Herben Jan Suda Jitka Klimesová Stanislav Mihulka Pavel Ríha Irena Símová

BACKGROUND AND AIMS Genome size is known to be correlated with a number of phenotypic traits associated with cell sizes and cell-division rates. Genome size was therefore used as a proxy for them in order to assess how common plant traits such as height, specific leaf area and seed size/number predict species regional abundance. In this study it is hypothesized that if there is residual correla...

2014
Mohsen SHATI AliAkbar HAGHDOOST Reza MAJDZADEH Kazem MOHAMMAD SeyedeSalehe MORTAZAVI

BACKGROUND Network scale-up is an indirect method for estimating the size of hidden, hard-to-count or high risk populations. Social network size estimation is the first step in this method. The present study was conducted with the purpose of estimating the social network size of the Tehran Province residents and its determinants. METHODS Maximum Likelihood Estimation was applied to estimate p...

1998
Linde E. T. Ostro Scott C. Silver Fred W. Koontz Truman P. Young Robert H. Horwich Louis Calder

We studied the ranging behavior of translocated and non-translocated groups of Alouatta pigra in Belize, Central America from March 1994 to May 1995. Home range size, day-range length and monthly range size were determined for all groups. In high density populations, home range size and day-range length increased with group size. Home range size increased with translocation to a low density pop...

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