Results 1 to 10 of about 2,746,849 (341)
Animal Biodiversity and Conservation, 2004 Increases or decreases in the size of populations over space and time are, arguably, the motivation for much of pure and applied ecological research. The fundamental model for the dynamics of any population is straightforward: the net change over time in the abundance of some population is the simple difference between the number of additions ...
Cooch, E. G., Dhondt, A. A.
core +9 more sources
SPATIAL POPULATION DYNAMICS [PDF]
Papers in Regional Science, 1976 This paper examines the relationships between natural increase (births minus deaths) and net migration (in-migrants minus out-migrants) in regional populations and identifies and clarifies some of the fundamental population dynamics involved. First the authors consider several well-defined regularities of fertility mortality and migration schedules ...
Andrei Rogers, Frans Willekens
openalex +8 more sources
Probability of males to outlive females: an international comparison from 1751 to 2020
BMJ Open, 2022 Objective To measure sex differences in lifespan based on the probability of males to outlive females.Design International comparison of national and regional sex-specific life tables from the Human Mortality Database and the World Population Prospects ...
Marie-Pier Bergeron-Boucher +3 more
doaj +1 more source
Housing and health outcomes: evidence on child morbidities from six Sub-Saharan African countries
BMC Pediatrics, 2023 Background The connection between healthy housing status and health is well established. The quality of housing plays a significant role in infectious and non-communicable as well as vector-borne diseases.
Kanyiva Muindi +3 more
doaj +1 more source
Reproductive Health, 2021 Résumé Contexte Alors que le gouvernement kenyan déploie des stratégies de haut niveau pour mettre fin aux grossesses chez les adolescentes d'ici 2030, il est nécessaire de bien cerner les facteurs qui favorisent les grossesses précoces non planifiées ...
Anthony Idowu Ajayi +5 more
doaj +1 more source
Genus, 2022 In this commentary, we bring together knowledge on sex-differences in excess death during the first wave of the COVID-19 pandemic in Italy, one of the most hit European countries.
Silvia Rizzi +2 more
doaj +1 more source
BMJ Global Health, 2021 Background Previous review studies have not systematically mapped the existing body of knowledge on adolescent sexual and reproductive health (ASRH) in sub-Saharan Africa (SSA).
Anthony Idowu Ajayi +4 more
doaj +1 more source
Extinction in population dynamics [PDF]
Physical Review E, 2004 We study a generic reaction-diffusion model for single-species population dynamics that includes reproduction, death, and competition. The population is assumed to be confined in a refuge beyond which conditions are so harsh that they lead to certain extinction.
Javier Buceta +3 more
openaire +4 more sources
Effect of HIV status on fertility intention and contraceptive use among women in nine sub-Saharan African countries: evidence from Demographic and Health Surveys [PDF]
Global Health Action, 2014 Background: Expanding access to antiretroviral therapy (ART) means that HIV is no longer a death sentence. This change has implications for reproductive decisions and behaviors of HIV-infected individuals.
Joyce N. Mumah +2 more
doaj +1 more source
Experimental evolution of a pheromone signal
Ecology and Evolution, 2022 Sexual signals are important in speciation, but understanding their evolution is complex as these signals are often composed of multiple, genetically interdependent components.
Thomas Blankers +3 more
doaj +1 more source