Human Population
Human Population - Related Videos
05:49
Robust Generation of Hepatocyte-like Cells from Human Embryonic Stem Cell Populations
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Cited by 26 •
2011
This article will focus on the generation of human hepatic endoderm from human embryonic stem cell populations.
14:47
Population Growth - Student Protocol
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2019
Exponential Population Growth Model ExpandNOTE: In these experiments you will use computer software to simulate different types of growth models. HYPOTHESES: The experimental hypothesis might be that if we increase either R, the reproductive rate or the initial population size, NT, that this will increase the population size after 10 generations in an exponential growth model compared to unmanipulated control populations. The null hypothesis may be that populations of different R and initial...
04:45
Population Growth - Concepts
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2019
Population Models An ecological population is a group of individuals of a single species living in an area at the same time. To persist, a population must either grow or maintain its size. Population ecology is the study of how population size and age distribution change over time through interactions with other species and the environment as well as with individuals of their own species. A particularly important feature that is studied by ecologists is the rate at which a population grows or...
02:04
Conservation of Small Populations
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2019
Small population sizes put a species at extreme risk of extinction due to a lack of variation, and a consequent decrease in adaptability. This weakens the chances of survival under pressures such as climate change, competition from other species, or new diseases. Large populations are more likely to survive pressures such as these, as such populations are more likely to harbor individuals that have genetic variants that are adaptive under new stresses. Small populations are much less likely to...
08:15
Isolation of Perivascular Multipotent Precursor Cell Populations from Human Cardiac Tissue
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Cited by 7 •
2016
Human cardiac tissue harbours multipotent perivascular precursor cell populations that may be suitable for myocardial regeneration. The technique described here allows for the simultaneous isolation and purification of two multipotent stromal cell populations associated with native blood vessels, i.e. CD146+CD34- pericytes and CD34+CD146- adventitial cells, from the human myocardium.
FAQs
Population size changes through the balance of births, deaths, and migration. More births than deaths can increase numbers, while deaths or outward migration can reduce them; inward migration can offset losses. Reproductive patterns and age distribution modify this balance over time, allowing biologists and demographers to interpret whether change reflects natural increase, movement, or both.
Age distribution helps explain why a population may continue changing even when its current size appears stable. The relative representation of different age groups influences future reproductive patterns and mortality, so researchers examine structure alongside population totals. This biological perspective supports projections of population trends and clarifies how past births and deaths shape future dynamics.
Carrying capacity links population change to the resources and conditions available in an environment. Resource availability, disease, technology, and social conditions can alter how many people an area can support and how sustainably it does so. Because these influences change, carrying capacity is not treated as a fixed number when assessing environmental pressure or future population trends.
Migration changes population structure as well as total size because people enter or leave particular regions. Its effects depend on where movement occurs and how it interacts with births, deaths, and age distribution. Examining these relationships helps distinguish local population change from broader human population trends and shows why regional patterns may differ from global ones.
An investigation begins by defining the geographic area and compiling information on births, deaths, migration, age distribution, and reproductive patterns. Researchers then relate these variables to resources, disease, technology, and social conditions. Comparing the resulting patterns helps describe population change, evaluate environmental interactions, and support projections rather than relying on population size alone.
Human population research informs public health by connecting population patterns with disease and social conditions. It also helps assess resource use and environmental impact, showing how changes in number, structure, and location can affect human well-being and sustainability. These applications make demographic and biological analysis relevant to evaluating pressures on environments and supporting sustainability research.
In biology, population analysis extends beyond counting people. Changes in population dynamics can influence genetic and biological diversity, while interactions with the environment affect resource use and sustainability. Considering these links allows researchers to connect reproductive patterns, movement, and population growth with broader questions about health, ecological conditions, and the long-term well-being of human communities.