Ecology: Populations and Population Growth

In this video, I go further into ecology and discuss populations of species, which are the number of organisms of the same species in an area. Since populations are usually impractical to count, models are used to estimate the population using a measured population density and accounting for the maximum carrying capacity that a given environment can maintain. Many populations typically grow exponentially at the initial stage, but then the growth rate slows down as the limits of the environment are reached – this is modelled through the logistic equation.

Previous predictions of the carrying capacity of Earth have been hindered by technological advancements and transfer across the world, such as in the Third Agricultural Revolution in the 1950s and 1960s. During this period, new technologies, including high-yielding varieties (HYVs) of cereals, were adopted, which greatly increased food production.

#science #biology #population #ecology #environment

51 Ecology Populations.png

Timestamps

Population is the number of organisms of a species in an area – 0:00
Long-term population growth is modelled with the logistic equation: @mes/differential-equations-population-growth-logistic-equation – 1:08
Logistic equation has an S-shaped curve and a maximum population or carrying capacity – 7:52
Green Revolution or Third Agricultural Revolution saw technology transfer across the world in the 1950s and 1960s – 10:15
Global North and Global South characterize the world along developed and undeveloped countries – 13:30
Characteristics of high-yielding varieties (HYVs) of agricultural crops – 16:37
Dwarfing is when an animal or plant is bred to be much smaller than normal – 17:26
Grafting is the joining of tissues of plants so that they grow together – 19:26