Many alien species become invasive because they lack coevolutionary history with the native community; for instance, they may lack specialized enemies. These evolutionary advantages may allow the invader to establish and persist when rare within a community and lead to its monodominance through positive frequency dependence, i.e. increasing per capita population growth rate with increasing freq...

Background: The number of scientific publication by a country is an important indication of its science generation and development. The aim of this study was to compare the publications in medical sciences of Islamic countries from 2002-2009 with those of a number of developed countries. Methods: The PubMed and CIA World Fact Book were used to extract the number of publications and socioeconomi...

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...

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...

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...

our country, iran is one of the countries in the world population it has become a social problem. iran's population growth despite decreased rate in recent years is still relatively high and due to the young population, there is also the possibility of increased population growth in the coming years. this study aimed to assess the reproductive status of working women (in education and training ...

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...