ecology cram session

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Ecology Cram Session. Ch 42-46. Ecology. Study of the interactions of organisms within their environment. Introductory Vocabulary. Hopefully you know these already…. Is this a population, a community or an ecosystem?. What are some biotic factors? What are some abiotic factors?. - PowerPoint PPT Presentation


  • Ecology Cram SessionCh 42-46

  • EcologyStudy of the interactions of organisms within their environment

  • Introductory VocabularyHopefully you know these already

  • Is this a population, a community or an ecosystem?What are some biotic factors? What are some abiotic factors?

  • Properties of PopulationsSize the total number of individuals in a populationDensity number of individuals per unit area/volume; sampling techniques like mark and recapture Dispersion pattern of spacing of individuals within the area the population inhabits; 3 kinds

  • What are examples of these?Schools of fish, trees, humans Nesting birds, territorial animalsTrees in a tropical rain forestWhich one is most common and which one is the most least common?** Most common** Least common

  • Properties of Populations Cont.Survivorship shows size and composition of a population; 3 types

  • 1. Shows organisms with low death rates in young and middle, and high death rates in old age (humans)2. Death rate is constant over life span (hydra, reptiles, rodents)3. Very high death rate among young and declining after surviving to a certain age (fish, invertebrates with 1000s of eggs)

  • Properties of Populations Cont.Age Structure diagrams show the relative numbers of individuals at each age

  • Exponential GrowthHumans have had this for over 300 yearsNo predation, parasitism or competitionHas an environment with unlimited resources

  • EventuallyThere is a limit to the number of individuals that can occupy one area at a particular time this is called carrying capacityThis capacity can change as the environment conditions changeWhat kind of growth is this?LOGISTIC GROWTH

  • Limiting FactorsThose factors that limit population growth2 categoriesDensity Dependent increase directly as pop. Density increases; include competition for food, buildup of wastes, predation, and diseaseDensity Independent unrelated to pop. Density; include earthquakes, storms, fires and floods

  • Chapter 45Population Interactions

  • CompetitionCompetition (intraspecific vs. interspecific)PredationMutualismCommensalismParasitismProducers vs. consumers vs. decomposersHerbivores vs. carnivores vs. omnivores vs. detritivore

  • Mite on damselfly

  • Types of mimicry/colorationAposematic coloration very bright coloration used as warningsBatesian mimicry one harmless animal mimics the coloration of one that is poisonousMullerian mimicry two or more poisonous species resemble each other & gain an advantage in their combined numbers

  • What is this called?

  • Chapter 53

  • 9 BiomesMarineTropical Rain ForestDesertTemperate GrasslandTemperate Rain ForestTemperate Deciduous ForestConifer Forest TaigaTundraChaparral

  • Chapter 46Understand Global Warming & Greenhouse Effect