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Selection: with tag population-density [9 articles] 


Ant-inspired density estimation via random walks

Proceedings of the National Academy of Sciences, Vol. 114, No. 40. (03 October 2017), pp. 10534-10541,


[Significance] Highly complex distributed algorithms are ubiquitous in nature: from the behavior of social insect colonies and bird flocks, to cellular differentiation in embryonic development, to neural information processing. In our research, we study biological computation theoretically, combining a scientific perspective, which seeks to better understand the systems being studied, with an engineering perspective, which takes inspiration from these systems to improve algorithm design. In this work, we focus on the problem of population density estimation in ant colonies, demonstrating that extremely ...


Exploring spatial patterns and drivers of forest fires in Portugal (1980–2014)

Science of The Total Environment, Vol. 573 (December 2016), pp. 1190-1202,


[Highlights] [::] Wildfires are irregularly distributed in Portugal, both in ignitions and burnt area. [::] In 80% of the municipality's ignition density reveal a positive trend since the 80s. [::] Geographically Weighted Regression was used to identify relevant municipal drivers of fires. [::] Topography and population density were significant factors in municipal ignitions. [::] Topography and uncultivated land were significant factors in municipal burnt area. [Abstract] Information on the spatial incidence of fire ignition density and burnt area, trends and drivers of wildfires is vitally important in providing ...


Regular patterns link individual behavior to population persistence

Proceedings of the National Academy of Sciences, Vol. 114, No. 30. (25 July 2017), pp. 7747-7749,


[Excerpt] Resisting and recovering from disturbances is a necessity for most species. The strategy is sometimes collective, depending on the aggregation of interacting individuals into regular patterns. However, relating patterns of abundance across scales to both individual behavior and population persistence remains a major challenge for ecology. Such patterns are found in many ecosystems, ranging from microbes to forests, with their regularity taking the form of evenly sized and spaced bands and patches of aggregated individuals. Regular patterns are said to ...


What causes large fires in Southern France

Forest Ecology and Management, Vol. 294 (April 2013), pp. 76-85,


[Highlights] [::] 0.8% Of fires were larger than 100 ha but accounted for 71% of total burned area. [::] On the whole area, the main cause was arson. [::] Occurrence mainly linked to shrubland population, minor road, fall-spring drought. [::] Burned area linked to shrubland fall–winter rain, summer drought, unemployment. [::] The areas the most affected were located to the East on the Mediterranean coast. [Abstract] In Southern France, where most wildfires occur, the fire size has never exceeded 6744 ha since 1991, whereas ...


Sensitivity of burned area in Europe to climate change, atmospheric CO2 levels, and demography: a comparison of two fire-vegetation models

Journal of Geophysical Research: Biogeosciences, Vol. 120, No. 11. (1 November 2015), pp. 2256-2272,


Global environmental changes and human activity influence wildland fires worldwide, but the relative importance of the individual factors varies regionally and their interplay can be difficult to disentangle. Here we evaluate projected future changes in burned area at the European and sub-European scale, and we investigate uncertainties in the relative importance of the determining factors. We simulated future burned area with LPJ-GUESS-SIMFIRE, a patch-dynamic global vegetation model with a semi-empirical fire model, and LPJmL-SPITFIRE, a dynamic global vegetation model with a ...


Climate, CO2 and human population impacts on global wildfire emissions

Biogeosciences, Vol. 13, No. 1. (15 January 2016), pp. 267-282,


Wildfires are by far the largest contributor to global biomass burning and constitute a large global source of atmospheric traces gases and aerosols. Such emissions have a considerable impact on air quality and constitute a major health hazard. Biomass burning also influences the radiative balance of the atmosphere and is thus not only of societal, but also of significant scientific interest. There is a common perception that climate change will lead to an increase in emissions as hot and dry weather ...


Relationships between human population density and burned area at continental and global scales

PLoS ONE, Vol. 8, No. 12. (16 December 2013), e81188,


We explore the large spatial variation in the relationship between population density and burned area, using continental-scale Geographically Weighted Regression (GWR) based on 13 years of satellite-derived burned area maps from the global fire emissions database (GFED) and the human population density from the gridded population of the world (GPW 2005). Significant relationships are observed over 51.5% of the global land area, and the area affected varies from continent to continent: population density has a significant impact on fire over most ...


Global and regional analysis of climate and human drivers of wildfire

Science of The Total Environment, Vol. 409, No. 18. (August 2011), pp. 3472-3481,


Identifying and quantifying the statistical relationships between climate and anthropogenic drivers of fire is important for global biophysical modelling of wildfire and other Earth system processes. This study used regression tree and random forest analysis on global data for various climatic and human variables to establish their relative importance. The main interactions found at the global scale also apply regionally: greatest wildfire burned area is associated with high temperature (> 28 °C), intermediate annual rainfall (350–1100 mm), and prolonged dry periods (which varies by ...


Anthropogenic effects on global mean fire size

International Journal of Wildland Fire, Vol. 24, No. 5. (2015), 589,


Wildland fires are an important agent in the earth’s system. Multiple efforts are currently in progress to better represent wildland fires in earth system models. Although wildland fires are a natural disturbance factor, humans have an important effect on fire occurrence by directly igniting and suppressing fires and indirectly influencing fire behaviour by changing land cover and landscape structure. Although these factors are recognised, their quantitative effect on fire growth and burned area are not well understood and therefore only partly ...

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