Changes in Nature

Regular Changes

  • Tidal (4 times a day) - Animals most affected by the varying or lack of oxygen are those in the intertidal zone (e.g. mangrove which 'breathe' through pneumatophore roots, crabs with gills)
  • Daily - Some organisms such as koalas are more active at night (nocturnal). Other organisms such as dogs are more active during the day (diurnal).
  • Monthly - The Lunar Cycle affects Spring and Neap tides which, in turn, affect organisms in coastal areas.
  • Seasonal - Plants are most affected by the change of seasons (spring, summer, autumn and winter).
  • Yearly - Flowering plants are most affected as the time of flowering for many plants such as chrysanthemums ('Mother's Day plants') is stimulated by the increasing number of hours of continuous darkness in a day. Deciduous plants lose their leaves in autumn. Hibernating animals (e.g. bears) and those with changing body temperatures (e.g. insects) become less active in the colder months.
  • Biennial or Perennial - Many smaller plants that are herbaceous have a life cycle of 2 to 3 years.
Did You Know That...? Roosters don't just crow at dawn. They crow all day, but are more active at dawn and dusk.

Irregular Changes in Nature