Environment Diversity (Chapter 34)faculty.sdmiramar.edu/bhaidar/Bio 107 Documents/Lecture...
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Environment Diversity (Outline) (Chapter 34)
1. From the biosphere to the organism2. Compare and contrast ecology, ecosystem, community, and
biome.3. The abiotic chemical and physical factors and the biosphere4. Aquatic biomes and abiotic and biotic factors affecting the
organism in aquatic ecosystems5. Terrestrial biomes and factors contributing to their climates6. The eight major terrestrial biomes and their vegetation7. The water cycle connecting aquatic and terrestrial biomes
Atom
Molecules
Organelle
Cell
Tissue
Organ
Organ system
Organism
Population
Community
Ecosystem
Bioshpere
The Hierarchical Structural Organization of Life
Anatomy&
Physiology
EcologyInteractions of living organisms with their
surrounding environment
Ecology
• The scientific study of interactions among organisms and their environment, such as the interactions organisms have with each other and with their abiotic environment
Environmentalism
• The broad philosophy, ideology and social movement that views living things other than humans, and the natural environment as a whole, are deserving of consideration in reasoning about the morality of political, economic, and social policies.
• The advocacy of the preservation, restoration, or improvement of the natural environment; especially: the movement to control pollution
• Rachel Carson a pioneer who documented her concerns about the global dangers of pesticide abuse in her 1962 book Silent Springwww.rachelcarson.org
Environmental awareness is relatively new
– The biosphere consists of ecosystems composed of • biotic living communities and • abiotic nonliving physical and chemical factors
– Biomes are distinct communities living in a particular climate• Aquatic biomes: fresh water and marine• Terrestrial biomes: 8 eight major ones, each with
own climate and plant life
Abiotic Factors
Determine the biosphere’s structure and dynamics, which include:• Solar energy• Temperature • Water• Nutrients• Other aquatic factors-
• amount of dissolved O2, salinity• Other terrestrial factors- wind
Aquatic Ecosystems
– Oceans cover about 75% of the Earth’s surface– Major factors shaping aquatic communities
Light and the availability of nutrients are the• Salt water (Marine )• Fresh Water
High waterLow water
Oarweed (to 2 m)
Brain coral(to 1.8 m)Intertidal
zone
Continental shelf
Benthic realm
Photiczone
Apho
tic zo
ne
Pelagic realm
Sea pen(to 45 cm)
(seafloor)
Brittle star(to 60 cm)
Sponges (1 cm to 1 m)
PhytoplanktonZooplankton
Octopus(to 10 m)
Sea spider(1 to 90 cm)
Glasssponge(to 1.8 m)
Sea cucumber(to 40 cm)
Rat-tail fish(to 80 cm)
Tripod fish(to 30 cm)
Man-of-war(to 50 m)
Blue shark(to 2 m)
Turtle(60 to 180 cm)
Sperm whale(10 to 20 m)
Hatchet fish(2 to 60 cm)
Gulper eel(to 180 cm)
Anglerfish(45 cm to 2 m)
200 m
“Twilight”
1,000 to4,000 m
No light
6,000 to10,000 m
Marine Biomes
Marine Biomes: Key Factors• Sunlight and where they live: solid bottom or in open
water• Three ones:
I. Intertidal zoneII. Photic zone (light)
Continental shelf (solid floor)Pelagic zone (open water)
III. Aphotic zone (light)TwilightNo light
Benthic (sea floor) Open water
The intertidal zone: where water meets land – Salt marshes, sand, rocky beaches, and tide pools– Often flooded by high tides and then left dry during
low tides
• The pelagic zone: open ocean– Phytoplankton and zooplankton– Supports highly motile animals such as fishes,
squids, and marine mammals
• The benthic zone: bottom of the ocean– supports organisms based upon water depth and
light penetration
• The photic zone: where light penetrates and photosynthesis occurs
• The aphotic zone: dark region of the ocean – most extensive part of the biosphere– Habitat for a diverse and dense populations
.
• Coral reefs: in warm tropical waters above the continental shelf– support a huge diversity of invertebrates and fishes
• Coral reefs are easily degraded by: – Pollution– Global warming– Native and
introduced predators
– Human souvenir hunters
Freshwater Ecosystems• Include: lakes, ponds, rivers, streams, and wetlands• Abiotic factors are: Current, sunlight, and nutrients
Wetlands
• Transitional Btwnaquatic & land
• Highly variable• Examples
– Wet mossy bogs and tropical swamps
– Seasonally wet vernal pools
Estuaries are productive areas where rivers meet the ocean
– The saltiness ranges from <1% to 3% – They provide nursery areas for oysters, crabs, and
many fishes– Rapidly dwindling due to development
Terrestrial Ecosystems• Eight major types of biomes• Distinguished by predominant vegetation• Biomes are influenced by regional climate
Climate• Global climate patterns are determined by
1. Solar energy2. The planet’s movement in space
– The Earth’s tilt causes the seasons– Wind patterns
3. Ocean Currents warms & cools coastal areas- created by winds, planet rotation, unequal heating of surface
waters, and the locations and shapes of continents
4. Mountains
• Regional Climate (temperature and precipitation) influences terrestrial communities
Low angle ofincoming sunlight
Sunlight strikesmost directly
Low angle ofincoming sunlight
Atmosphere60°SSouth Pole
Tropic ofCapricorn30°S
0° (equator)
30°NTropic ofCancer
North Pole60°N
Solar radiation varies with latitude due to the uneven heating of Earth’s surface
23.5°N
23.5°S
Trade winds
Ascendingmoist airreleasesmoisture
Trade winds
Descendingdry airabsorbsMoisture-(westerlies)
Temperatezone
Temperatezone
Tropics
Doldrums0°
Uneven heating causes rain and winds
Descendingdry airabsorbsMoisture-(westerlies)
Prevailing wind patterns – In the tropics, Earth's rapidly moving surface deflects
vertically circulating air, blowing winds from east to west (Trade Winds)
– In temperate zones, the slower-moving surface blows winds from west to east(The westerlies)
Greenland
NorthAmerica
Europe
Africa
Gulf Stream
PacificOcean
AtlanticOcean
South America
Atlantic Ocean currents
EastWinddirection
PacificOcean
CoastRange
SierraNevada
Rain shadowDesert
Rainfall is affected by location of mountains, prevailing winds, and ocean current patterns
If the climate in two geographically separate areas is similar, the same type of biome may occur in both places
Biome Types in relation to temperature and rainfall
http://www.learner.org/courses/envsci/unit/text.php?unit=4&secNum=2
30°NTropic ofCancer
60°N
Arcticcircle
Equator
Tropic ofCapricorn
30°S
Tropical forestSavannaDesertChaparral
Temperate grasslandTemperate broadleaf forestConiferous forestTundra
High mountainsPolar ice
Major Terrestrial Biomes
www.aresearchguide.com/biomes.htmlhttp://www.blueplanetbiomes.org/world_biomes.htm
Tropical Rain ForestsSeveral types in the warm, moist belt along the equator– Most diverse ecosystem on Earth– Poor soil growth depend on fast decomposition– Large-scale human destruction of tropical rain forests endangers
many species and may alter world climate
Savannas Drier grasslands with scattered trees in tropical
areas and some non-tropical• Fire-adapted vegetation
DesertsDriest of all terrestrial ecosystems– characterized by low and unpredictable rainfall– Desertification is a significant environmental problem
The Chaparral Biome• Dominated by Spiny shrubs (Southern California) • Characterized by cool, rainy winters and dry, hot
summers• Poor soil low to
moderate diversity– Chaparral vegetation is adapted to periodic fires
Temperate GrasslandsFound in the interiors of the continents, where
winters are cold (croplands of the world)– Excellent soil with moderate to high diversity– Drought, fires, and grazing animals prevent trees from growing– Farms have replaced most of North America’s temperate
grasslands
Temperate Broadleaf ForestsSufficient moisture to support growth of large trees• trees drop leaves in winter• soil excellent with moderate diversity – Almost all the original broadleaf forests in North America
have been drastically altered by agriculture and urban development
Coniferous Forests or Taiga/Boreal• The largest terrestrial biome on Earth• Evergreen with poor soil and low to moderate
diversity (dominated by a few species of trees)• Characterized by long, cold winters and short,
wet summers
The Arctic TundraLies between the taiga and the permanently frozen
polar regions– A treeless biome characterized by long, bitter-cold winters
cold, wind, and permafrost (continuously frozen subsoil)– plants very
low to ground minimal root system
Solarheat Net movement
of water vaporby windWater vapor
over the sea
Precipitationover the land
Water vaporover the land
Precipitationover the sea
Evaporationfrom the sea
Evaporationandtranspiration
Flow of waterfrom land to sea
Surfacewater andgroundwater
Oceans
The global water cycle connects aquatic and terrestrial biomes