Ecology and natural systems
11 videos
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Biology - Ecology and Natural Systems: The Big Picture
An introduction to ecology explaining how living things interact with each other and Earth's four spheres: atmosphere, biosphere, geosphere, and hydrosphere.
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Biology - Biotic vs. Abiotic Factors
Learn the difference between biotic (living) and abiotic (non-living) factors in ecosystems and how they interact to support life on Earth.
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Biology - From Populations to Biomes: Levels of Ecology
This video explains the five levels of ecological organization: organism, population, community, ecosystem, and biome, using a wolf in a forest as an example.
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Biology - An Organism's Niche and Tolerance Range
This video explains ecological tolerance ranges, niches, and survival strategies. It covers how organisms thrive in optimal conditions and compares generalist vs specialist species.
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Biology - Population Density and Dispersion Patterns
Learn about population ecology basics: density, dispersion patterns (clumped, uniform, random), and how births, deaths, immigration, and emigration drive population change.
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Biology - Exponential vs. Logistic Growth
This video explains exponential vs. logistic population growth, introducing carrying capacity (K) and comparing J-shaped and S-shaped growth curves with real-world examples.
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Biology - Exponential and Logistic Growth: Practice Problem
This video explains exponential vs. logistic population growth using a fish lake example, showing how carrying capacity limits growth and creates an S-curve pattern.
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Biology - r-Selected vs. K-Selected Species
This video explains r-selected vs K-selected reproductive strategies: r-selected species produce many offspring with little care, while K-selected species have few offspring with high investment.
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Biology - Species Interactions: Competition, Predation, and Symbiosis
This video explains the five major types of species interactions: competition, predation, mutualism, commensalism, and parasitism, using simple examples and plus/minus notation.
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Biology - Predator-Prey Population Cycles
This video explains the predator-prey cycle using snowshoe hares and Canadian lynx, showing how their populations rise and fall in linked, repeating patterns over time.
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Biology - Competitive Exclusion and Resource Partitioning
This video explains competition between species, the competitive exclusion principle, and how resource partitioning allows different species to coexist by occupying unique niches.