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Ch 33-34

Published on Nov 19, 2015

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PRESENTATION OUTLINE

1.

ECOSYSTEM

  • An ecosystem is a collection of communities of organisms and the environment in which they live.
  • They include nonliving components, such as sunlight, and living components which are all the different organisms
  • Examples are tide pools, forests, and ultimately all of life on earth and its physical environment.
2.

AUTOTROPH

  • They produce organic nutrients for their own use.
  • They require only inorganic nutrients and an outside energy source.
  • Producers are an example of autotrphs such as plants and algae.
3.

HETEROTROPH

  • They need a preformed source of organic nutrients.
  • They are the consumers.
  • Carnivores, omnivores, herbivores, and decomposers are all heterotrophs.
4.

FOOD CHAIN

  • A single path of energy flow according to who eats whom.
  • It starts at the producers and ends with decomposer.
  • Ex: leaves>caterpillars>tree birds>hawks.
5.

TROPHIC LEVEL

  • All the organisms that feed at a particular link in the food chain.
  • There are four levels. Producers> primary, secondary, and tertiary consumers.
  • Plants, herbivores and carnivores are all trophic levels.
6.

ECOLOGY

  • The study of the interactions of organisms with eachother and the environment.
  • It ís wide ranging and involves several levels of study.
  • Population, community, and ecosystems are al, part of ecology.
7.

ECOLOGICAL SUCCESSION

  • A change in community composition that happens over time.
  • Primary succession: no soil. Secondary: soil present.
  • Ex. Volcanic eruptions, cornfield
8.

BIOTIC POTENTIAL

  • The highest possible per capita rate of increase for a population.
  • Whether it is high or low depends on reproduction, age, survival, and offspring.
9.

CARRYING CAPACITY

  • The number of individuals of a species a particular environment can hold indefinately.
  • The stable equlibrium phase occurs during carrying capacity.
10.

NICHE

  • The role an organism plays in a community and interactions with other organisms
  • It includes the resources an organism uses to meet its energy, nutrients, and survival demands.
  • Ex. A she lions role in the environment is to kill prey for food.

Tori Williams