Chapter 34 Lecture Notes

Chapter 34.1
The biosphere is the global ecosystem

 

Define the following key terms:

  • Ecology
  • Biotic factor
  • Abiotic Factor
  • Population
  • Community
  • Ecosystem
  • Biosphere
  • Habitat

The study of Ecology

  • Ecologist: are scientists who conduct research in ecology.
  • Ecologists test their hypotheses outdoor in the field as well as in the lab.
  • They also use computer models to understand complex interactions between organism and their environment.

The study of Ecology

  • Ecologist: are scientists who conduct research in ecology.
  • Ecologist test their hypotheses outdoor in the field as well as in the lab.
  • They also use computer models to understand complex interactions between organism and their environment.
  • An organisms environment consists of other organisms as well as non living factors.
  • Ecologist study the relationships among biotic and abiotic factors.

List 3 abiotic factors.

An Individual organism is part of a

Population which makes up a

Community which is part of an

Ecosystem which is in the Biosphere

See figure 34-1

Patchiness of the Biosphere

  • The Biosphere is not spread out uniformly around the planet (see fig. 34-2)
  • Observe the uneven distribution of ecosystems (deserts, grassland, forest etc)
  • The environmental variations are due to differences in biotic & abiotic factors such as temperature, soil type, availability of water & light.
  • See figure 34-3

Key abiotic Factors

  • Abiotic factors include sunlight, water, temperature, soil and wind.
  • Sunlight: provides light & warmth
  • Water: essential for all life on Earth
  • Temperature: regulated by the amount of sunlight, most organisms survive between 0 and 50 °C. Some organisms are adapted to live in more extreme temperatures.
  • Soil: is a product of abiotic forces (such as ice, rain & wind) and living things (such as microorganisms, plants & earthworms)
  • Wind: affects the distribution & activities of organisms e.g. wind moves clouds (rain), disperses seeds, and stirs up rivers and lakes creating water currents.

Assessment

  • Complete the Concept Check on page 748
  • Answer in complete sentences
  • You may use the same paper as your notes.
  • We will go over the answers together in class.