Zusammenfassung der Ressource
Changes in communities
- Birth Rate and Death Rate:
- Birth Rate: number of
births in a population.
- Death rate: number of
deaths in a given time period
- Immigration: New members
join the population.
- Migration: Members leave
the population.
- Primary Succession:
- The series of changes that
occurs in an area where no
soil or organisms exist.
- Secondary Succession
- The series of changes that
occurs in an area where the
ecosystem has been disturbed.
- Limiting Factors:
- Climate: Because of
temperature or rainfall,
because there are some
species that don't support so
much cold to leave so
they die.
- Space: Because there are
some species that need an
especipic amount of space,
and if they have less of what
they need they will die.
- Food and water:
Because if there is
not so much water or
food the species will
die because they don't
hydratate or eat food.