Author: Publisher:
ISBN:
Category : Population
Languages : en
Pages : 268
Book Description
Population Dynamics Quarterly
Author: Using Models to Estimate Hog and Pig Inventories
Author: National Academies of Sciences, Engineering, and MedicinePublisher: National Academies Press
ISBN: 030949575X
Category : Technology & Engineering
Languages : en
Pages : 111
Book Description
In 2014, the National Agricultural Statistics Service (NASS) engaged the National Academies of Sciences, Engineering, and Medicine to convene a planning committee to organize a public workshop for an expert open discussion of their then-current livestock models. The models had worked well for some time. Unfortunately beginning in 2013, an epidemic that killed baby pigs broke out in the United States. The epidemic was not fully realized until 2014 and spread to many states. The result was a decline in hog inventories and pork production that was not predicted by the models. NASS delayed the workshop until 2019 while it worked to develop models that could help in times both of equilibrium and shock (disease or disaster), as well as alternative approaches to help detect the onset of a shock. The May 15, 2019, workshop was consistent with NASS's 2014 intention, but with a focus on a model that can help predict hog inventories over time, including during times of shock. This publication summarizes the presentations and discussions from the workshop.
The Environmental Implications of Population Dynamics
Author: Lori M. HunterPublisher: Rand Corporation
ISBN: 9780833043689
Category : Social Science
Languages : en
Pages : 128
Book Description
This report discusses the relationship between population and environmental change, the forces that mediate this relationship, and how population dynamics specifically affect climate change and land-use change.
Cities Transformed
Author: Mark R. MontgomeryPublisher: Routledge
ISBN: 1134031661
Category : Political Science
Languages : en
Pages : 553
Book Description
Over the next 20 years, most low-income countries will, for the first time, become more urban than rural. Understanding demographic trends in the cities of the developing world is critical to those countries - their societies, economies, and environments. The benefits from urbanization cannot be overlooked, but the speed and sheer scale of this transformation presents many challenges. In this uniquely thorough and authoritative volume, 16 of the world's leading scholars on urban population and development have worked together to produce the most comprehensive and detailed analysis of the changes taking place in cities and their implications and impacts. They focus on population dynamics, social and economic differentiation, fertility and reproductive health, mortality and morbidity, labor force, and urban governance. As many national governments decentralize and devolve their functions, the nature of urban management and governance is undergoing fundamental transformation, with programs in poverty alleviation, health, education, and public services increasingly being deposited in the hands of untested municipal and regional governments. Cities Transformed identifies a new class of policy maker emerging to take up the growing responsibilities. Drawing from a wide variety of data sources, many of them previously inaccessible, this essential text will become the benchmark for all involved in city-level research, policy, planning, and investment decisions. The National Research Council is a private, non-profit institution based in Washington, DC, providing services to the US government, the public, and the scientific and engineering communities. The editors are members of the Council's Panel on Urban Population Dynamics.
Population Dynamics
Author: C. Y. Cyrus ChuPublisher: Oxford University Press, USA
ISBN: 0195121589
Category : Family demography
Languages : en
Pages : 241
Book Description
This book fills the gap between the classical supply-side theory of Malthus and the modern demand-side theory of economic demography. Specifically, it investigates the dynamic macroeconomic implications of various static microeconomic-family economic decisions. It is within this framework that Professor Chu studies the income distribution, the attitude composition, the job structure, and the savings (including pensions) of the population. Chu applies a mathematical apparatus, the theory of branching processes, to his problem, and supplies the reader with much detail and several discursive discussions on the topic. Graduate-level students, professors, and professional economists will be interested in Chu's efforts.
Analytical Population Dynamics
Author: T. RoyamaPublisher: Springer Science & Business Media
ISBN: 9401129169
Category : Science
Languages : en
Pages : 384
Book Description
A knowledge of animal population dynamics is essential for the proper management of natural resources and the environment. This book, now available in paperback, develops basic concepts and a rigorous methodology for the analysis of animal population dynamics to identify the underlying mechanisms.
Perturbation, Behavioural Feedbacks, and Population Dynamics in Social Animals
Author: Daniel OroPublisher:
ISBN: 0198849834
Category : Mathematics
Languages : en
Pages : 165
Book Description
In social animals, perturbations may trigger specific behavioural responses with consequences for dispersal and complex population dynamics. Perturbations raise the need for information gathering in order to reduce uncertainty and increase resilience. Updated information is then shared within the group and social behaviours emerge as a self-organized process. This social information factoralizes with the size of the group, and it is finally used for making crucial decisions about, for instance, when to leave the patch and where to go. Indeed, evolution has favoured philopatry over dispersal, and this trade-off is challenged by perturbations. When perturbations accumulate over time, they may decrease the suitability of the patch and erode the philopatric state until crossing a tipping point, beyond which most individuals decide to disperse to better areas. Initially, the decision to disperse is led by a few individuals, and this decision is copied by the rest of the group in an autocatalytic way. This feedback process of social copying is termed runaway dispersal. Furthermore, social copying enhances the evolution of cultural and technological innovation, which may cause additional nonlinearities for population dynamics. Social information gathering and social copying have also occurred in human evolution, especially after perturbations such as climate extremes and warfare. In summary, social feedback processes cause nonlinear population dynamics including hysteresis and critical transitions (from philopatry to patch collapses and invasions), which emerge from the collective behaviour of large ensembles of individuals.
Concepts of Biology
Author: Samantha FowlerPublisher:
ISBN: 9781739015503
Category :
Languages : en
Pages : 0
Book Description
Black & white print. Concepts of Biology is designed for the typical introductory biology course for nonmajors, covering standard scope and sequence requirements. The text includes interesting applications and conveys the major themes of biology, with content that is meaningful and easy to understand. The book is designed to demonstrate biology concepts and to promote scientific literacy.
Population Growth: Observations and Models
Author: Maxime Seveleu-DubrovnikPublisher: Vodary Paris
ISBN: 2490771000
Category : Business & Economics
Languages : en
Pages : 119
Book Description
Modeling as used in social science and in particular in demography, is a complicated process. Modeling population dynamics has traditionally been the central branch of mathematical biology, and counts more than 210 years of history, notwithstanding the recent expansion of this science's scope. The first principle of population dynamics is widely regarded as the exponential law of Malthus, as modeled by the Malthusian growth model. The early period was dominated by demographic studies such as the work of Benjamin Gompertz and Pierre François Verhulst in the early 19th century, who refined and adjusted the Malthusian demographic model. In this volume, dedicated to the 250th anniversary of Thomas R. Malthus, we publish several modern analyses that illustrate the honored place the Malthus's work occupies in the science of demographic modeling. Editors: Maxime Seveleu-Dubrovnik and William R. Nelson
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