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Habitat Destruction .ppt

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					Habitat Destruction
 Ernetta K. Smith
  Dr. A. Welch
  March 4, 2004
     Ecology
      What is a Habitat?

A habitat is the physical and biological
 environment used by an individual, a
  population, a species, or a group of
                 species.
  What is Habitat Loss?
  Habitat Loss has occurred when
quality of the environment is so low
that it is no longer usable by a given
                species.
       What is Habitat
       Degradation?
Habitat Degradation is the process by
  which habitat quality for a given
        species is diminished.
     What is a Biota?
  A biota is the combination of
animals, plants, and fungi within a
              region.
    What are Causes of
      Habitat Loss?
Causes of Habitat Loss include man
 made objects such as roads, dams,
      and Utility Corridors.
     Habitat Loss-Roads
Roads are structures used to facilitate
  movement. However, they are
    barriers for animals such as
  amphibians, small reptiles, and
            invertebrates.
    Habitat Loss-Roads
Although many animals are capable
of crossing roads, they may be run
       down in the process.
     Habitat Loss-Dams
  Damming streams and rivers have
 destroyed many aquatic ecosystems.
Many animals move up and down the
streams searching for places to forage
             and breed.
     Habitat Loss-Dams
 Moving downstream these animals
 are likely to be churned to death in
  turbines. Moving upstream, they
 encounter an unmovable wall that
may or may not provide a food chain.
     Habitat Loss-Utility
         Corridors
   Utility Corridors are used apply
     fences to large landscapes,
controlling the movement of livestock
       and large wild animals.
   Habitat Loss-Utility
        Corridor
 Utility Corridors are also used to
  dissect landscapes, potentially
isolating organisms from reaching
         their comfort zone.
     What are the
Consequences of Habitat
        Loss?
  Consequences of Habitat Loss
  include the endangerment and
extinction of species, as well as the
destruction of land and ecosystems.
      Habitat Loss-More
          Examples
Other structures that are considered to
   be a cause of Habitat Loss are
 parking lots, mines, buildings, and
              railroads.
   What are Causes of
  Habitat Degradation?
Causes of Habitat Degradation are
Air Pollution, Water Pollution, and
            Pesticides.
 Habitat Degradation-Air
        Pollution
 A combination of CFC’s and halons
reduce the concentration of the ozone,
 allowing UV rays to reach the earth
 surface, forming toxic clouds called
                smog.
Habitat Degradation-Air
       Pollution
 Although Air Pollution is not a
 primary cause in the decline of
 populations, it may still lead to
      localized extinction.
   Habitat Degradation-
     Water Pollution
  Water Pollution includes material
such as mud that smothers the bottom
    of aquatic ecosystems at high
           concentrations.
   Habitat Degradation-
     Water Pollution
    Water pollution affects marine
  biodiversity via extirpation. Also,
stresses populations by reducing their
         reproductive success.
   Habitat Degradation-
        Pesticides
   Pesticides, Insecticides, and
Rodenticides are used to kill animals
     that would eat our crops.
    Fragmentation and
        Barriers
  Fragmentation and Barriers are
conservation problems because they
 destroy the ecosystems of species.
     Fragmentation and
         Barriers
Fragmentation is a process by which
ecosystem destruction can isolate the
  biota of ecosystems that remain
               intact.
              Barriers
  Barriers are structures that are built to
 eliminate passage, which in this case the
causes of habitat loss and degradation help
       to inhibit animal movement.

				
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posted:2/1/2012
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