Bio 105 1st editionCurrent Lecture 34Human Population - ~7 billion- Sharp rise in human population because of industrial revolution - Brought new technologies and fewer people dies of disease or starvation.- Average age increasedCarry Capacity - How many humans or number of species an environment can support. - There is a carrying capacity for life on Earth. It cannot support unlimited amounts of humansLimitation factors –- Limit the carrying capacity for species and biological communities.- Space, amount of food and water, amount of resources, mates, disease- Limiting factors not only influence species but also the environment around it. - Removal of limiting factors will increase populationS-Curve – - Lay – accumulate right after a birth of a species- Exponential growth- Stable equilibrium (carrying capacity)J-Curve – (unrestricted growth) Population growing in absence of limiting factors- You will get population increase- Exponential growth - The carrying capacity of an ecosystem drops when the J-curve comes into play. Ecosystem is damaged and cannot support it.- J-curve crash – rapid dying due to overpopulationo Recovery – depends on how long is lasts and amount of damage. o Loss of biodiversity o Soil qualityo Degradation of waste and air quality The population numbers for species that are preys foretell the predator’s population numbers. They fluctuate together. These notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.- Science and technology unite driving industrial revolution, modern medicine, hygiene, and agriculture.o It can be expanded by technology, but at the expense of other forms of life.~1800 – ecological footprint of humanity, carrying capacity of the Earth US are the third most populated country.- Is it improbable that humanity will never again experience the phenomenon population growth that is occurring now- Current projection lifetime of today’s college students will spin the final phase of the population increase. - Unique in history of humankind, our generation will witness and predicate in fundamental changes.Overpopulation – population has grown beyond carrying capacity of the environment. Population cant grow indefinitely, finite resources cant support infinite
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