نتایج جستجو برای: population growth parameters

تعداد نتایج: 1977652  

2016
Lydia E. Belton Elissa Z. Cameron Fredrik Dalerum

Increasing human population growth has led to elevated levels of human-carnivore conflict. However, some carnivore populations have adapted to urban environments and the resources they supply. Such associations may influence carnivore ecology, behaviour and life-history. Pockets of urbanisation sometimes occur within protected areas, so that anthropogenic influences on carnivore biology are not...

2011
Virginie Rolland Jeffrey A. Hostetler Tommy C. Hines Fred A. Johnson H. Franklin Percival Madan K. Oli

Context. Hunting-related (hereafter harvest) mortality is assumed to be compensatory in many exploited species. However,whenharvestmortality is additive, hunting can lead topopulationdeclines, especially onpublic landwherehunting pressure can be intense. Recent studies indicate that excessive hunting may have contributed to the decline of a northern bobwhite (Colinus virginianus) population in ...

Journal: :Journal of Ethnobiology and Ethnomedicine 2006
Julieta Ramos-Elorduy

Edible insects are a natural renewable resource that provides food to many ethnic groups in Mexico. Some of these species are overexploited because of increased consumption, caused by the huge human population growth in the area and because of the large demand of these insects from many restaurants in Mexico and in other countries. In Tulancalco, a small arid village in the State of Hidalgo, I ...

Journal: :Cancer research 2014
Jill Gallaher Aravind Babu Sylvia Plevritis Alexander R A Anderson

To provide a better understanding of the relationship between primary tumor growth rates and metastatic burden, we present a method that bridges tumor growth dynamics at the population level, extracted from the SEER database, to those at the tissue level. Specifically, with this method, we are able to relate estimates of tumor growth rates and metastatic burden derived from a population-level m...

1999
JOHN LUKE GALLUP JEFFREY D. SACHS ANDREW D. MELLINGER

Location and climate have large effects on income levels and income growth through their effects on transport costs, disease burdens, and agricultural productivity, among other channels. Geography also seems to affect economic policy choices. Many geographic regions that have not been conducive to modern economic growth have high population densities and are experiencing rapid increases in popu...

Journal: :Science 2008
George Wittemyer Paul Elsen William T Bean A Coleman O Burton Justin S Brashares

Protected areas (PAs) have long been criticized as creations of and for an elite few, where associated costs, but few benefits, are borne by marginalized rural communities. Contrary to predictions of this argument, we found that average human population growth rates on the borders of 306 PAs in 45 countries in Africa and Latin America were nearly double average rural growth, suggesting that PAs...

2018
Christine Sample John M Fryxell Joanna A Bieri Paula Federico Julia E Earl Ruscena Wiederholt Brady J Mattsson D T Tyler Flockhart Sam Nicol Jay E Diffendorfer Wayne E Thogmartin Richard A Erickson D Ryan Norris

Variation in movement across time and space fundamentally shapes the abundance and distribution of populations. Although a variety of approaches model structured population dynamics, they are limited to specific types of spatially structured populations and lack a unifying framework. Here, we propose a unified network-based framework sufficiently novel in its flexibility to capture a wide varie...

2011

The first positive trend is the slowing of global population growth. There is a significant shift in global fertility that will enable us at least to think about moving to a world of near stable populations within a century, maybe sooner. Fertility in about 40 per cent of the world’s countries is now below the replacement rate. Another 40 per cent are experiencing continued downward movement of...

Journal: :Cadernos de saude publica 2005
David Vlahov Sandro Galea Emily Gibble Nicholas Freudenberg

The majority of the world's population will live in cities in the next few years and the pace of urbanization worldwide will continue to accelerate over the coming decades. While the number of megacities is projected to increase, the largest population growth is expected to be in cities of less than one million people. Such a dramatic demographic shift can be expected to have an impact on popul...

Journal: :The American naturalist 2013
Martin M Turcotte David N Reznick J Daniel Hare

An eco-evolutionary feedback loop is defined as the reciprocal impacts of ecology on evolutionary dynamics and evolution on ecological dynamics on contemporary timescales. We experimentally tested for an eco-evolutionary feedback loop in the green peach aphid, Myzus persicae, by manipulating initial densities and evolution. We found strong evidence that initial aphid density alters the rate and...

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