MAJOR WORLD ECOSYSTEMS - PowerPoint PPT Presentation

Loading...

PPT – MAJOR WORLD ECOSYSTEMS PowerPoint presentation | free to download - id: 6d5abc-MzY2Y



Loading


The Adobe Flash plugin is needed to view this content

Get the plugin now

View by Category
About This Presentation
Title:

MAJOR WORLD ECOSYSTEMS

Description:

CHAPTER 7 Important abiotic factors: temperature and precipitation. Temperature decomposition rates Elevation-latitude similarity: temperature drops and organisms ... – PowerPoint PPT presentation

Number of Views:1
Avg rating:3.0/5.0
Date added: 7 January 2020
Slides: 17
Provided by: Leis86
Category:

less

Write a Comment
User Comments (0)
Transcript and Presenter's Notes

Title: MAJOR WORLD ECOSYSTEMS


1
MAJOR WORLD ECOSYSTEMS
  • CHAPTER 7

2
TERRESTRIAL BIOMES
  • Important abiotic factors temperature and
    precipitation.
  • Temperature ? decomposition rates
  • Elevation-latitude similarity temperature drops
    and organisms change with elevation and latitude
  • Elevation-latitude difference extreme change in
    day length with latitude, not elevation.
    Increased radiation with altitude, not latitude

3
TYPES OF TERRESTRIAL BIOMES
  • Tundra oil/natural gas exploration damages
  • Taiga (boreal forest) logged!! Largest land
    biome, not good farming (slow decomposition)
  • Temperate rain forest cooler than tropical RF
    cool temp. delay decomposition logging
  • Temperate deciduous forest nutrient rich soil ?
    cleared for agriculture
  • Temperate grassland turned to farmland, esp.
    midwest US!! Adaptations for fire?

4
TEMPERATE RAIN FOREST
Decomposer activity slowed by cool temperature
Ferns and moss on ground
5
(No Transcript)
6
  • Chaparral plants hold soil in place, plants
    adapted for fire
  • Desert cold and hot, homes here require lots of
    water to be imported, easy to drain aquifer,
    recovers slowly from disturbances
  • Savanna some sm. trees, rangeland for cattle
    esp. in Africa (fastest human pop. growth)
  • Tropical rain forest nutrient poor soil b/c
    high temp. increases decomposers and nutrients
    are quickly absorbed. High solar radiation and
    high precipitation high productivity, highly
    threatened mainly by industrial
    expansion/agriculture in tropical countries

7
Check for understanding
  • 4 - I can explain to my peers how abiotic
    factors influence biomes, adaptations of
    organisms in each biome, and I can describe the
    threats to each biome.
  • 3 - I understand how abiotic factors influence
    biomes, adaptations of organisms in each biome,
    and I can describe the threats to each biome.
  • 2 - I understand biomes but I need more practice
  • 1 - I am lost about terrestrial biomes

8
AQUATIC BIOMES
  • Imp. abiotic factors are salinity (NaCl),
    dissolved oxygen, and light
  • Freshwater (2 earths surface) and marine

9
FRESHWATER BIOMES
  • Rivers/streams threatened by dams and
    pollution, faster/colder more O2
  • Lakes/ponds low nutrients, sensitive to
    eutrophication due to still water thermacline
    (cooldense O2)zones littoral, limnetic,
    profundal
  • Marshes/swamps ecosystem services wildlife
    habitat for many, control flooding, purify water
    threatened by filling in for development
    (Everglades)
  • Estuaries salt and fresh meet, high
    productivity, mangroves stabilize soil and
    prevent coastal erosion, suffer pollution from
    human land activities, and algal growth from
    nitrogen/phosphorus from fertilizers

10
Check for understanding
  • 4 - I can explain to my peers how abiotic
    factors influence freshwater biomes and I can
    describe the threats to each biome.
  • 3 - I understand how abiotic factors influence
    freshwater biomes and I can describe the threats
    to each biome.
  • 2 - I understand the different types of
    freshwater biomes but I need more practice
  • 1 - I am lost about freshwater biomes

11
MARINE BIOMES
  • Human threats to coral reefs
  • Sedimentation
  • From clear-cutting upstream
  • Overfishing
  • Coral bleaching
  • Mining of corals as building materials
  • Runoff pollution

12
  • Human threats to ocean
  • Human sewage introduces pathogens to seafood
  • Trash entangles some organisms
  • Fertilizer and heavy metal run-off
  • Oil from drilling
  • Shrimp trawls destroy benthic (bottom) communities

Cocoa Beach
13
(No Transcript)
14
Check for understanding
  • 4 - I can describe to my peers the threats to
    each type of marine biome.
  • 3 - I understand the threats to each type of
    marine biome and could answer test-style
    questions right now .
  • 2 - I understand the threats to marine biomes,
    but I need more practice
  • 1 - I am lost about marine biomes

15
Difficulties to protecting biomes
  • Require cooperation (countries, regions, locales)
  • Takes a lot of TIME to fix

16
Case study The Everglades
  • Problem is too little water and polluted water
  • Hurricane ? human construction to stop lake from
    flooding ? dried up Everglades ? land converted
    to farmland ? fertilizers/pesticides enter
    Everglades (changes conditions for plant growth)
  • Major crop sugar cane is subsidized
  • Restoration of some land (but cant all b/c of
    cities/sugarcane fields) projected at 20 years
    and 8 billion
About PowerShow.com