Populations- factors and definitions

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  • Populations- factors and definitions
    • Definitions
      • Population
        • All of the organisms of one species in the same habitat
      • Habitat
        • The area in which an organism lives
      • Community
        • Populations of different species in a habitat
      • Ecosystem
        • All of the organisms living in a particular area and the abiotic (nonliving) condisiotns
      • Niche
        • the role of a species within its habitat
      • Biotic factors
        • A factor created by a living thing or component within an environment
        • in which the action of that organism affects the life of another
          • A factor created by a living thing or component within an environment
      • Abiotic factor
        • A non-living factor in the environment
      • Competition
        • A relationship between different organisms requiring the same resources
          • One organism can outcompete another
        • One organism can outcompete another
      • Intraspecific competition
        • Competition between individuals of the SAME species
        • Example- nettles competing for light or water
          • Competition between individuals of the SAME species
      • Interspecific competition
        • Competition between members of DIFFERENT speices
          • oak tree and nettles competing for light
      • sowing density
        • to make a profit crop farmers need to sow the right number of seeds per unit areas
    • The effect of abiotic factors
      • Different conditions suit different species
        • for example nettles grow well in high conc of phosphate ions
      • examples: temp, light, humidity, windspeed
        • oxygen conc, soil moisture content, PH, soil type, light intensity
      • oxygen conc, soil moisture content, PH, soil type, light intensity
      • the non-living part of the environment
    • The effect of biotic factors
      • the living part of the environment
      • example the feeding by ladybirds on aphids
    • Resources frequently competed for
      • Plants
        • Mineral ions
          • available in the soil, often in short supply
          • competition for these can limit plant growth
        • Water
          • plants take up a large amount in transpiration
          • usually in shirt supply in many ecosystems
        • light
          • essential for photosynthesis
        • Space
          • a major issue as plants are unable to move to other areas
      • Animals
        • Food- the most frequent
        • Space- mainly an issue for those with limited movement eg barnacles
        • Breeding-between same species for mates and breeding sites

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