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Transcript
Principles of Ecology O’Connor/Chapter 2 Ecology • The study of interactions that take place between organisms and their environments. • Biosphere ~ the portion of Earth that supports living things. Extends from high in the atmosphere to the bottom of the oceans. Living vs. Nonliving Abiotic Factors • Biotic Factors • Nonliving parts parts of an organism’s environment. • All living organisms that inhabit an environment. • Ex. Air currents, temp., moisture, light, and soil. • Ex. Animals & plants. Levels of Organisms • To understand interactions of the biotic and abiotic parts of the world, ecologists have organized the living world into levels – The organism itself, populations, communities & ecosystems. Populations • A group of organisms, all of the same species, which interbreed and live in the same area at the same time. Map of populations by country Biological Communities • Interacting populations in a certain area at a certain time. Ecosystems • Interacting populations in a biological community and the community’s abiotic factors. Types of Ecosystems • • • • • • • • Terrestrial Forrest Old farm field Meadow Yard Garden plot empty lot Compost heap Volcano site Rotting log Aquatic • Freshwater – – – – Pond Lake Stream Estuary Marine (salt H2O) -ocean -estuary -aquarium Other Ecosystems • Human Body - ex. Skin • Buildings - ex. Basement • Food - moldy food Habitat • A place where an organism lives out its life. Niche • A role or position a species has in its environment- how it meets its specific needs for food & shelter, how & where it survives, and where it reproduces in its environment. Symbiosis • Relationship where there is a close and permanent association between organisms of different species. Three kinds: • Mutualism • Commensalism • parasitism Mutualism • Both species benefit + + • Ex. Ants & acacia trees- ants feed off it & protect it from damaging predators Commensalism + o • One species benefits and the other species is neither harmed nor benefited. Parasitism + • When one species benefits at the expense of another species. Flea bites on human How organisms Obtain Energy • The producers – autotrophs • The consumers – heterotrophs • The decomposers Energy Flow Through the Ecosystem A food Chain - Web • A model that scientists use to show how matter & energy move through an ecosystem. • In a chain nutrients & energy move from autotrophs to heterotrophs & eventually to decomposers. The arrow points to the mouth the eats it. Which of these is an omnivore? Levels of heterotrophs • First –order (primary consumers)ex. Herbivores like deer, turtles & fish. Obtain food by eating photosynthetic organisms. • Second-order (secondary consumers) Carnivores like owls. They eat first order heterotrphs like mice. • Third-order -Carnivores that feed on second order heterotrophs. Ex. Bears, lions, humans Biomass • Foundation species (also known as primary producers) harvest an energy source such as sunlight and turn it into biomass. • Primary production is generation of biomass through photosynthesis. Biomass Production The highest producers of biomass are • tropical rain forests, 2000 g/m²/yr of biomass • swamps and marshes, 2500 g/m²/yr of biomass • algal beds and reefs, 2000 g/m²/yr of biomass • Lowest producers are • deserts and frozen areas (less than 200 g/m²/yr of biomass) Trophic Levels Cycles in nature • • • • The water cycle The carbon cycle The nitrogen cycle The phosphorus cycle • The materials of life, such as carbon & nitrogen, are used and reused as they cycle through the ecosystem. Water Cycle Carbon Cycle Nitrogen Cycle Phosphorus Cycle