Ecosystems
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The document discusses key concepts relating to ecosystems, including the interactions between living and non-living components. It defines ecosystems as local communities that directly interact and exhibit interdependent relationships, compared to biomes which describe larger global communities. The document also outlines the flow of energy through ecosystems, including producers, consumers, and decomposers, and explains food chains, food webs, and the inefficiency of energy transfer between trophic levels.
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Ecosystems
- 1. Ecosystems Each and All As I spoke beneath my feet The ground-pine curled its pretty wreath, Running over the club-moss burrs; I inhaled the violet's breath; Around me stood the oaks and firs; Pine-cones and acorns lay on the ground; Over me soared the eternal sky, Full of light and of deity; Again I saw, again I heard, The rolling river, the morning bird;-- Beauty through my senses stole; I yielded myself to the perfect whole. - Ralph Waldo Emerson
- 3. Levels of Organization Biosphere Biome Ecosystem Community Population Organism
Editor's Notes
- I thought the sparrow's note from heaven, Singing at dawn on the alder bough; I brought him home, in his nest, at even; He sings the song, but it cheers not now, For I did not bring home the river and sky;-- He sang to my ear, -- they sang to my eye . The delicate shells lay on the shore; The bubbles of the latest wave Fresh pearls to their enamel gave, And the bellowing of the savage sea Greeted their safe escape to me. I wiped away the weeds and foam, I fetched my sea-born treasures home; But the poor, unsightly, noisome things Had left their beauty on the shore With the sun and the sand and the wild uproar. As I spoke beneath my feet The ground-pine curled its pretty wreath, Running over the club-moss burrs; I inhaled the violet's breath; Around me stood the oaks and firs; Pine-cones and acorns lay on the ground; Over me soared the eternal sky, Full of light and of deity; Again I saw, again I heard, The rolling river, the morning bird;-- Beauty through my senses stole; I yielded myself to the perfect whole.
- biosphere All the Earth's ecosystems considered as a single, self-sustaining unit. biome A large community of plants and animals that occupies a distinct climate region. ecosystem A community of organisms together with their physical environment, viewed as a system of interacting and interdependent relationships and including such processes as the flow of energy through trophic levels and the cycling of chemical elements and compounds through living and nonliving components of the system. community A group of organisms or populations living and interacting with one another in a particular environment. The organisms in a community affect each other's abundance, distribution, and evolutionary adaptation. population A group of individuals of the same species occupying a particular geographic area.
- Flower makes energy from the sun, which feeds the caterpillar, which becomes food for the frog, who feeds the snake who becomes the owl's next dinner.
- Think about how many trees, bushes, flowers and blades of grass cover the earth. Now include all the algae and seaweed in the oceans. Consider all the animals, fish, plankton and insects in the world.
- When a deer gobbles up a broccoli plant in my mom's garden, how much of the plant's energy is passed on? True for mass also - only 10% of plant mass eaten becomes a part of the organism that eats it.
- life processes : cellular respiration, movement, digestion, other life functions (brain impulses, circulation, cell division, etc.)
- Symbiosis = two species that live together in close relationship. Can be parasitic, mutualistic, neutral or commensal (birds nest in trees - one benefits and the other is unaffected) Other symbiotic organisms: Oxpecker eats lice & other parasitic insects off the backs of oxen, zebra and rhinos; Clown fish lives within anemone, eating leftovers; ants protect acacia trees by stinging herbivores while trees provide nectar to the ant; barnacles attach to jaws of whales; beneficial microbes in human gut Pathogens = parasites that cause an illness or disease. Ticks are parasites, but they don't cause an infectious disease. Bacteria cause infections that allow the pathogen to reproduce, ultimately killing the host.