BACKGROUND The leprosy transmission chain is very complex and, in order to intervene in this transmission, more must be known about the factors linked to falling ill. There are doubts as to the influence of population size, population density and the disease's magnitude in detection rate trends. This paper aimed to identify factors associated with detection of leprosy in an endemic municipality...

Dog population management is conducted in many countries to address the public health risks from roaming dogs and threats to their welfare. To assess its effectiveness, we need to monitor indicators from both the human and dog populations that are quick and easy to collect, precise and meaningful to intervention managers, donors and local citizens. We propose that the most appropriate indicator...

How cooperation emerges and is stabilized has been a puzzling problem to biologists and sociologists since Darwin. One of the possible answers to this problem lies in the mobility patterns. These mobility patterns in previous works are either random-like or driven by payoff-related properties such as fitness, aspiration, or expectation. Here we address another force which drives us to move from...

Predictions of surface water exposure to "down-the-drain" chemicals are presented which employ grid-based spatially-referenced data on average monthly runoff, population density, country-specific per capita domestic water and substance use rates and sewage treatment provision. Water and chemical load are routed through the landscape using flow directions derived from digital elevation data, acc...

The relative effects of resource availability and partitioning on animal population density are unresolved yet central to ecology and conservation. Species-depauperate islands offer an intriguing test case. Across 643 lizard populations from around the world, local abundances are one order of magnitude higher on islands than on mainlands, even when controlled for resource availability. On mainl...

The Population Debate W ith around four babies born every minute, Philippine population is expected to hit 84.2 million by the end of the year. Growing at an average of 2.3% annually, the country’s population has increased fourfold since the 1950s. It now ranks 14th in the world in terms of population size and 8th in terms of population density. This phenomenon is seen either as an onus or a gi...

We use a frictionless neoclassical general-equilibrium model to explain cross-metro variation in population density based on three broad amenity types: quality of life, productivity in tradables, and productivity in non-tradables. Analytically, we demonstrate the dependence of quantities on amenities through substitution possibilities in consumption and production. Our calibrated model predicts...

How do the lifestyles (free-living unparasitized, free-living parasitized, and parasitic) of animal species affect major ecological power-law relationships? We investigated this question in metazoan communities in lakes of Otago, New Zealand. In 13,752 samples comprising 1,037,058 organisms, we found that species of different lifestyles differed in taxonomic distribution and body mass and were ...

Objective. Although such measures received media attention as indicative of a nationwide rebellion against sprawl, determinants of the appearance and success of 1998 and 1999 open-space preservation ballot measures have not been investigated. We suspect that, contrary to assumptions, these are not triggered by sprawled development and represent a response limited to small, wealthy communities. ...