in this study we investigated the impacts of population increase on life quality, with a special focus on its impact on the natural resources and environmental issues. this analysis was conducted using data over a 16 year period. since water is one of the most important factors contributing to the growth and development of countries, the increase in population size, industry sector growth, urba...

Environmental variability can destabilize communities by causing correlated interspecific fluctuations that weaken the portfolio effect, yet evidence of such a mechanism is rare in natural systems. Here, we ask whether the population dynamics of similar sympatric species of a seabird breeding community are synchronized, and if these species have similar exceptional responses to environmental va...

A central problem in population ecology is to use time series data to estimate the form of density dependence in the per capita growth rate (pgr). This is often accomplished with phenomenological models such as the theta-Ricker or generalized Beverton-Holt. Using the theta-Ricker model as a simple but flexible description of density dependence, we apply theory and simulations to show how multim...

Conventional surplus production models indicate that destruction of fish populations by overfishing is difficult, if not impossible, but catastrophic declines in abundance of exploited populations are common. Surplus production models also do not predict large continuing fluctuations in yield, but large fluctuations in yield are common. Conventional surplus production models assume that fisheri...

In the earlier publications (Nielsen aka Nurzynski, 2013a, 2013b) we have discussed the growth of human population in Australia as determined by the study of the time-dependent distribution of rock shelter sites between 10,000 and 1,000 years BP (before present). We have shown that if the number of rock shelter sites is assumed to represent also the size of human population, the growth of the p...

Understanding the factors that limit and regulate wildlife populations requires insight into demographic and environmental processes acting throughout the annual cycle. Here, we combine multi-year tracking data of individual birds with a 26-year demographic study of a migratory songbird to evaluate the relative effects of density and weather at the breeding and wintering grounds on population g...

In 2015, the 2030 Agenda for Sustainable Development was adopted by all United Nations Member States and includes a set of 17 Goals. The indicator, “Ratio land consumption rate to population growth rate” (indicator 11.3.1) proposed monitoring urban development. present study proposes analysis built-up space evolution in relation demographic main metropolitan areas Romania using 11.3.1 indicator...

the beet armyworm (spodoptera exigua hübner) is an important pest of many agricultural crops all over the world. most of the sugar beet growing regions in iran are infested. in this study, the acute lethal effects of pyriproxyfen, spinosad, and indoxacarb as well as sublethal effects of pyriproxyfen on the 1st instar s. exigua were assessed by leaf dip bioassay method. mortality was recorded 48...