EE 319K Introduction to Embedded Systems Lecture 6 SysTick Timer_ Exam 1 Review.ppt

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EE 319K Introduction to Embedded Systems Lecture 6 SysTick Timer_  Exam 1 Review.ppt Powered By Docstoc
					ECOLOGICAL AND ECONOMIC IMPACTS
         HERPETOFAUNA
                         BROWN TREE SNAKE
Reduction in native biodiversity
-caused local extinction of over half of Guam’s native
bird and lizard species & two out of three of Guam’s
native bat species (1)
Human Heath
- mildly venomous
Economic/livelihoods
- caused thousands of power outages                    “snake's food source is far
- direct damages and loss , estimated: $1 to 4 million
  yr (2)                                               more limited in its native
Agriculture                                              range than the virtual feast
-damage crops                                            that awaited it on Guam, and
                                                         equally optimal conditions
                                                         remain a possibility on other
                                                         snake-free oceanic islands if
                                                         the snake colonizes them”
WHAT SORTS OF IMPACTS HAVE PREVIOUSLY
BEEN IDENTIFIED FOR YOUR TAXONOMIC GROUP?
 Ecological Impacts

 Positive:
 -Increase native species richness
 -Increase nutrient cycles


 Negative:
 -Decrease in native biodiversity
 -Native species naïve, fall prey to introduced species
 -Lead to extinction of native species
 -Disease transmission
 -Rapid colonization
 -Pathogen vector
What sorts of impacts have
previously been identified for
your taxonomic group? (cont.)

Economic Impacts


Positive:
- Pet trade


Negative:
- Costs money for prevention, eradication,
  and/or management
IN THE READINGS…
Engeman R. et al: Invasive Exotic Species in   Green Iguanas (Iguana Iguana): The
Florida                                        Unintended Consequence of Sound
                                               Wildlife Management Practices in a
                                               South Florida Park
-Green iguanas could negativity
impact the Florida’s burrowing                 -Green  iguanas are erosion
owl                                            hazards along drainage
                                               canals in Florida (a)
                 &
 -Consume fruits of invasive
plants acting as dispersal agents

-Black spiny tailed lizards prey
on threatened and/or endangered
species’ eggs
          OUR FINDINGS…
Number of Invasive Species: 44
Number of Invasive Species Analyzed: 25

Most Common Impacts:
-Competition
-Predation
Rare Impacts:
-Disease transmission,
-Spread of other invasive species

Ex: Black Spiny Tailed Iguana spreads seeds of Brazilian Pepper
PREDATION OF INVASIVE
   HERPETOFAUNA



                  Predation

                  No predation

                  Unknown

                 Predation       21
                 No predation    2
                 Unknown         2
COMPETITION OF INVASIVE
   HERPETOFAUNA

                 Competion

                 No Competition

                 Unknown


                 Competition      15
                 No Competition    8
                 Unknown          2
DISEASE VECTORS OF INVASIVE
      HERPETOFAUNA




                Carriers


                Not Carriers


               Carriers        5
               Not Carriers    20
             TIME TO PUT ON YOUR
               DISCUSSION CAP

Threats to non-native ecosystems:
-Prey on trees snails, insects, plants, bird eggs, birds, reptiles,
crabs, small mammals, domestic animals
-Decreased biodiversity; can lead to further invasions
Threats to local economies of non-native range:
-Power outages
-Property damage
-Safety hazards
-Public heath
           UNIQUE IMPACTS

CARIBBEAN TREE FROG                GREEN IGUANA

-Compete with native species       -Exotic pest
-Harm commercial flower business   -Pose runway hazard
-Increase nutrient cycle rates     -Damage roads by burrowing
-Auditory disturbances             into ground
      TAKE HOME POINT
Invasive herpetofauna are generalists whom mainly impact
non-native ecosystems through predation and competition
with native species, but can detrimentally interfere with
                              .
surrounding communities.
                                           References
Photographs:
http://ambergriscaye.com/critters/redeyedtreefrog.html
http://www.floridanaturepictures.com/reptiles/reptiles.html
http://www.fort.usgs.gov/resources/education/bts/invasion/colonize.asp
http://www.fort.usgs.gov/resources/education/bts/bioeco/btsnake.asp
http://newswatch.nationalgeographic.com/2008/08/08/snake_plague_on_guam_impacts_t/
ClipArt


Facts:
http://www.petwatch.net/browse_animals/reptiles/47-common_or_green_iguana
http://www.fort.usgs.gov/resources/education/bts/bioeco/btsnake.asp
http://www.cabi.org/isc/?compid=5&dsid=91542&loadmodule=datasheet&page=481&site=144
http://digitalcommons.unl.edu/icwdm_usdanwrc/693/?utm_source=digitalcommons.unl.edu%2Ficwdm_
usdanwrc%2F693&utm_medium=PDF&utm_campaign=PDFCoverPages (a)

Google scholar
U.S Global Invasive Species Database
Global Invasive Species Database
Invasive Species Compendium
(1) Savidge 1987; Rodda & Fritts 1992
(2) Fritts & Leasman-Tanner 2001; Fritts 2002

				
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