Sentences with phrase «estimate population density»

It seems GISS haven't heard about thin cloud, varying water vapour, dust and aerosols, which reduce the apparent brightness of urban sites, which GISS uses to estimate population density for the adjustments.

That's the central question behind a University of Arkansas biologist's three - year, $ 465,098 study to test a new method for estimating population densities of two species of rare snakes.

Not exact matches

By evaluating the scale insect remains attached to each specimen, Youngsteadt estimated scale population density and compared it to the average August temperature for the year and place where the specimen was collected.

«At certain points, population densities were estimated to be up to 500 specimens per square metre,» says Davor Lučić at the Institute for Marine and Coastal Research in Dubrovnik, Croatia.

Finally, they calculated the population's turnover rate to estimate an average density of 50 clams per square meter over the last millennium — a number that contrasts with fieldwork earlier this year that yielded just three clams per square meter, they report in the December issue of Geology.

When he plugged in estimates of prehistoric population sizes and densities, he found that the ideal demographic conditions for advancement began in Africa 100,000 years ago — just when signs of modern behavior first emerge.

As for how many people the planet can sustain, the first such estimate came from microbiologist Anton van Leeuwenhoek who calculated roughly 13.4 billion people back in 1679, based on the population density of his native Holland and its size relative to the rest of the globe.

European scientists asked volunteers to estimate statistics like the population density of Switzerland.

By linking worldwide data on solid waste, population density, and economic status, we estimated the mass of land - based plastic waste entering the ocean.

The estimates were based on information including World Bank data for trash generated per person in all nations with a coastline, coastal population density, the amount of plastic waste countries produce and the quality of their waste - management practices.

Researchers have estimated that during the last Ice Age, parts of Siberia may have had an average population density of sixty animals per hundred square kilometres - equivalent to African elephants today.

«This was clearly not realistic, as the estimated maximum numbers of birds killed typically exceeded breeding density and productivity combined, such that the prey populations studied would probably have gone extinct rapidly at a local level or acted as a major sink for birds immigrating from neighbouring areas.»

Estimates of cat population densities range from 0.03 to 4.7 cats per square kilometre in relatively unmodified and pastoral landscapes, and from 0.7 to 800 cats per square kilometre in highly modified landscapes, such as rubbish dumps.

In 2012, San Nicolas Island had the greatest density of foxes anywhere in the world and a population estimated at over 600 individuals.

Compared with western Europe, the current leader in offshore wind energy, the United States is estimated to have more abundant and favorable onshore wind resources, which are largely located in areas with low population density.

Output flood extent and depths are coupled with an impact model based on population density and depth - damage relations to estimate PA and ED for selected return periods.

Based on detailed reports of TCs that were generated in the Southern Ocean and hit Australia since 1970, from the Australian Bureau of Meteorology, Seo constructed damage estimates «using the reported financial loss, destruction of houses and capital goods, and losses of agricultural crops and livestock after a careful examination of the detailed individual cyclone reports,» which also included «local area income and population density where the storm hit.»

Even when assuming population growth at the lowest end of the forecasts (scenario B), we estimate there to be more than one billion people in the LECZ globally by 2060 with an average population density of 405 people / km2.