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Ecology Part II

Ecology Part II. r & K Strategists Symbiosis. r-Strategists. Many species of life that can reproduce rapidly under ideal conditions are called r-strategists. Included are species like bacteria, insects, some plants, protozoa,

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Ecology Part II

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  1. Ecology Part II r & K Strategists Symbiosis

  2. r-Strategists • Many species of life that can reproduce rapidly under ideal conditions are called r-strategists. Included are species like bacteria, insects, some plants, protozoa, • Characteristics of this group include, production of many offspring, little if any parental care, and rapid maturity.

  3. R-strategists

  4. K-strategists • Many species are much slower growing and tend to live long successful lives with low mortality are called K-strategists. • They tend to produce much fewer offspring, population density is low and typically the populations are at or near carrying capacity. • Most provide extensive parental support to the young which helps in successful offspring.

  5. Examples include Bears, Whales, Gorillas, Elephants, Bald Eagles and Humans. • Many of these species are on endangered species lists because if threatened, it may take many years to grow the population back. (ex. Bald eagles and DDT)

  6. K-strategists

  7. Generalizations-Populations can be K-selected (equilibrium populations) or r-selected (opportunistic populations) • Characteristic r-selected K-selected • populations populations • -Maturation time short long • -Lifespan short long • -Population boom-and-bust growth curve • -Death rate high low in young • -Investment of time in offspring none some

  8. Characteristic r-selected K-selected populations populations • -Number of offspring many few • -# reproductions per lifetime one several • -Timing of first reproduction early in life late in life • -Habitat` unstable stable

  9. Symbiosis are two organisms living and interacting together. • Types • Mutualism-Both species benefit . • Commensalism-One species benefits and the other is neither harmed or benefits. • Parasitism-One species benefits and the other is harmed.

  10. Mutualism

  11. Commensalism

  12. Parasitism

  13. Biological Niche • The role in which an organism plays within its Ecosystem. • Examples include, Predator, Producer, Insect Eater, Bottom Feeder, Tree Dweller, Consumer. In short it, is the organisms job and position in the place where it lives. • Species often compete for the same Niche or sometimes a Niche may be unoccupied.

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