ecosystem powerpoint 2
TRANSCRIPT
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2.4.1-.2 Biomes
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BIOME is the collection of ecosystems
sharing similar climatic conditions.
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Uneven Solar Heating and Latitude
Earth as a whole is in thermal equilibrium, but different latitudes are not.
Moving masses of air and ocean currents transport energy from
locations with a surplus to those with a deficit. 5/1/2013 Author-Guru IB/ESS 4
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Cell 3 South
Cold, dry air falls
Moist air rises — rain
Cell 2 South
Cool, dry air falls
Cell 1 South
Moist air rises, cools, and releases moisture as rain
Cell 1 North
Cool, dry air falls
Cell 2 North
Moist air rises — rain
Cell 3 North Cold, dry air falls
Polar cap
Arctic tundra
60°
30°
0°
30°
60°
Polar cap
Evergreen coniferous forest
Temperate deciduous forest and grassland
Desert
Tropical deciduous forest
Equator Tropical rain forest
Tropical deciduous forest
Desert
Temperate deciduous forest and grassland
Model of global air
circulation and
biomes.
The direction of air
flow and the ascent
and descent of air
masses in
convection cells
determine the
earth’s climatic
zones.
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Mountain Ice and snow
Altitude
Tundra (herbs, lichens, mosses)
Coniferous Forest
Tropical Forest
Deciduous Forest
Tropical Forest
Deciduous Forest
Coniferous Forest
Tundra (herbs, lichens, mosses)
Polar ice and snow
Latitude
Generalized effects of altitude and latitude on climate and biomes.
Parallel changes in vegetation occur when moving from the
Equator to the poles or from the lowlands to mountaintops.
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DESERT BIOMES
Tropical desert (Saudi Arabia)
Polar desert (northwest China)
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GRASSLAND BIOMES
Tropical grassland (savanna) (Harare, Zimbabwe)
Polar grassland (arctic tundra) (Fort Yukon, Alaska) 5/1/2013 Author-Guru IB/ESS 9
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FOREST BIOMES
Tropical rain forest (Manaus, Brazil) Temperate deciduous forest
(Nashville, Tennessee) 5/1/2013 Author-Guru IB/ESS 10
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AQUATIC BIOMES
Coral reefs Rivers
Lakes Mangroves
Ocean
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High tide Low tide
Coastal Zone
Estuarine Zone
Continental shelf
Open Sea Sea level
Sun
Euphotic Zone
Bathyal Zone
Abyssal Zone
Depth in meters
0
50
100
200
Ph
oto
syn
the
sis
500
1,000
1,500
2,000
3,000
4,000
5,000
10,000
Dar
knes
s Tw
iligh
t
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DIVERSITY is a generic term for heterogeneity. If may refer to:
1. Genetic diversity is the total number of genetic characteristics of a specific species.
2. Habitat diversity is the diversity of habitats in a given unit area.
3. Species diversity
a. Species richness – total number of species.
b. Species evenness – relative abundance of each species.
c. Species dominance – the most abundant species.
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Figure A and B have
the same species
richness, but
different species
evenness.
A
B
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What is Biome?
A biome is a specific area characterized by the animals and plants that live within it, the climate conditions, the amount of water available, the soil conditions, and the location of the area.
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• The seven main biomes that can be found all
over the world.
• The Desert, Grasslands, Temperate
Deciduous Forests, Rainforests, Taiga, and
the Tundra
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CLASSIFICATION OF BIOMES
A fundamental classification of biomes is into:
• Terrestrial (land) biomes
• Freshwater biomes
• Marine biomes
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Terrestrial (land) biomes
Freshwater biomes
Marine biomes
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What is tropical rainforest ?
A tropical rainforest is an ecosystem usually
found around the equator,
They are common in Asia, Australia, Africa,
South America, Central America, Mexico and
on many of the Pacific Islands.
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Rainforests are home to half of all the living
animal and plant species on the planet.
Tropical rain forests are called the "world's
largest pharmacy" because over one-quarter of
modern medicines originate from its plants.
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DISTRIBUTION
The tropical forests are restricted to the small land
area between the latitudes 22.5
North and 22.5
South of the equator, or in other words between
the Tropic of Capricorn and the Tropic of Cancer.
Since the majority of Earth's land is located north
of the tropics, rainforests are naturally limited to a
relatively small area.
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Major Tropical rain Forest Area
CENTRAL AMERICA
THE AMAZON
AFRICA
SOUTHERN ASIA
AUSTRALASIA
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CENTRAL AMERICA
Central America is famous for its large number
of tropical birds, including many kinds of
parrots
This region was once entirely covered with
rainforest, but large areas have been cleared for
cattle ranching and for sugar cane plantations.
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The photograph below shows a particular ecosystem.
1.State and briefly describe the ecosystem shown in the photograph
2. State whether you would expect ecosystems of the type shown in the
photograph to have a low, medium or high level of abiotic factors.
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THE AMAZON
The Amazon is the world's largest and most famous
rainforest.
The Amazon is home to more species of plants and animals than any other ecosystem on the planet and perhaps 30% of the world's species are found there.
American rainforests are most threatened today with large-scale agriculture (especially soybeans), clearing for cattle pasture, subsistence agriculture by poor farmers, and logging.
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AFRICA Central Africa holds the world's second largest
rainforest.
To the south east, the large island of Madagascar was once intensively forested, but now much of it is gone.
Africa contains areas of high cloud forest, mangrove swamps and flooded forests.
The island of Madagascar is home to many unique plants and animals not found anywhere else.
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SOUTHERN ASIA
• The rainforests of Asia stretch from India and Burma in the west to Malaysia and the islands of Java and Borneo in the east.
•
• In Southeast Asia the climate is hot and humid all year round. In the mainland Asia it has a subtropical climate with torrential monsoon rains followed by a drier period.
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What is Freshwater Biome? The freshwater biome is a low-saline, or sweet
water, aquatic biome that covers one fifth of the earth's surface.
Streams, rivers, swamps, bogs, ponds, lakes, ditches, puddles, and canals comprise the tributaries of the freshwater biome.
Animals and plants in this biome might reside along the bank, beneath open water, on the surface of the water, or move between water and an adjacent biome.
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TYPES OF FRESHWATER
• There are 3 different types of freshwater regions:
Ponds and Lakes
Streams and Rivers
Wetlands
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These regions range in size from just a few square meters to thousands of square kilometers. Scattered throughout the earth.
Many ponds are seasonal, lasting just a couple of months.
Ponds and lakes may have limited species diversity since they are often isolated from one another and from other water sources like rivers and oceans.
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For the organism you have chosen, describe and evaluate a method for estimating
its abundance. 5/1/2013 Author-Guru IB/ESS 56
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STREAMS & RIVERS
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Streams and rivers
These are bodies of flowing water moving in
one direction.
Streams and rivers can be found everywhere
— they get their starts at headwaters, which
may be springs, snowmelt or even lakes, and
then travel all the way to their mouths, usually
another water channel or the ocean.
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Numerous aquatic green plants and algae can
be found in these bodies.
Since there is less light, there is less diversity
of flora, and because of the lower oxygen
levels, fish that require less oxygen, such as
catfish and carp, can be found.
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1.Name an organism in an ecosystem that you have studied and state one abiotic
factor that might affect this organism.
Organism:
.........................................................................................................
Factor:
...............................................................................................................
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Wetlands
Wetlands are areas of standing water that support aquatic plants.
Marshes, swamps, and bogs are all considered wetlands. Plant species adapted to the very moist and humid conditions are called Hydrophytes.
These include pond lilies, cattails, sedges, tamarack, and black spruce. Marsh flora also include such species as cypress and gum.
These support different species of animals, such as shrimp, shellfish, and various grasses.
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What is Marine Biome?
The marine biome includes all the water that is on the earth's surface.
The marine biome covers three fourths of the earth. There are thousands of animals and plants in the biome.
or
Marine regions cover about three-fourths of the Earth's surface and include oceans, coral reefs, and estuaries
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Marine Biomes are classified into three types.
• Coral reefs
• Estuaries
• Oceans
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Oceans
The largest of all the ecosystems, oceans are very large bodies of water that dominate the Earth's surface.
The ocean regions are separated into separate zones: intertidal, pelagic, abyssal, and benthic.
All four zones have a great diversity of species.
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The intertidal zone is where the ocean meets the land — sometimes it is submerged and at other times exposed, as waves and tides come in and out.
The pelagic zone includes those waters further from the land, basically the open ocean.
The pelagic zone is generally cold though it is hard to give a general temperature range since, just like ponds and lakes
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The benthic zone is the area below the pelagic zone, but does not include the very deepest parts of the ocean
The bottom of the zone consists of sand, slit, and/or dead organisms.
The deep ocean is the abyssal zone. The water in this region is very cold (around 3
C), highly
pressured, high in oxygen content, but low in nutritional content.
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TUNDRA
• Tundra is the coldest of all the biomes. Tundra comes from the Finnish word tunturi, meaning treeless plain.
• It is noted for its frost-molded landscapes, extremely low temperatures, little precipitation, poor nutrients, and short growing seasons.
• Dead organic material functions as a nutrient pool. The two major nutrients are nitrogen and phosphorus. Nitrogen is created by biological fixation, and phosphorus is created by precipitation.
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Biomes of the World
1. The Tundra
2. Low biotic diversity
alpine vs arctic tundra
1. Extremely cold climate
3. Simple vegetation structure 4. Permafrost limited drainage
5. Short growing season
6. Energy and nutrients in the form
of dead organic material
7. Large population oscillations
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Characteristics of tundra include:
• Extremely cold climate
• Low biotic diversity
• Simple vegetation structure
• Limitation of drainage
• Short season of growth and reproduction
• Energy and nutrients in the form of dead
organic material
• Large population oscillations
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• Tundra is separated into two types:
• Arctic tundra
• Alpine tundra
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Arctic tundra
• Arctic tundra is located in the northern
hemisphere, encircling the north pole and
extending south to the coniferous forests of the
taiga.
• The growing season ranges from 50 to 60 days.
• The average winter temperature is -34
C, but
the average summer temperature is 3-12
C
(37-54
F) which enables this biome to sustain
life.
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• There are no deep root systems in the
vegetation of the arctic tundra, however, there
are still a wide variety of plants that are able
to resist the cold climate.
• There are about 1,700 kinds of plants in the
arctic and subarctic, and these include:
• Low shrubs, sedges, reindeer mosses,
liverworts, and grasses
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• Animals are adapted to handle long, cold
winters and to breed and raise young quickly
in the summer.
• Animals such as mammals and birds also
have additional insulation from fat.
• Many animals hibernate during the winter
because food is not abundant.
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Alpine tundra
• Alpine tundra is located on mountains
throughout the world at high altitude where
trees cannot grow.
• The growing season is approximately 180
days.
• The nighttime temperature is usually below
freezing. Unlike the arctic tundra, the soil in
the alpine is well drained.
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• The plants are very similar to those of the arctic ones and include:
• tussock grasses, dwarf trees, small-leafed shrubs, and heaths
• Animals living in the alpine tundra are also well adapted:
• Mammals: pikas, marmots, mountain goats, sheep, elk
• Birds: grouselike birds
• Insects: springtails, beetles, grasshoppers, butterflies
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The desert biome • Deserts cover about one fifth of the Earth's
surface and occur where rainfall is less than
50 cm/year.
• Most deserts have a considerable amount of
specialized vegetation, as well as specialized
vertebrate and invertebrate animals.
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• Desert biomes can be classified according to
several characteristics.
There are four major types of deserts:
• Hot and dry Desert
• Semiarid Desert
• Coastal Desert
• Cold Desert
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Hot and dry desert
• Hot and dry desert present in North American
countries.
• The seasons are generally warm throughout the
year and very hot in the summer.
• The winters usually bring little rainfall.
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• Desert surfaces receive a little more than twice
the solar radiation received by humid regions .
• The animals include small nocturnal (active at
night) carnivores.
• The dominant animals are burrowers and
kangaroo rats. There are also insects, arachnids,
reptiles and birds.
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Semiarid Desert
• The major deserts of this type include the
• Sagebrush of Utah,
• Montana and Great Basin.
• They also include the North America,
Newfoundland, Greenland, Russia, Europe and
northern Asia.
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Coastal desert
• These deserts occur in moderately cool to
warm areas is the coastal desert.
A good example is the Atacama of Chile.
• The soil is fine-textured with a moderate salt
content.
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Salt bush Buckwheat bush
Little leaf horse brush
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Cold desert • These deserts are characterized by cold winters
with snowfall and high overall rainfall
throughout the winter and occasionally over the
summer.
• They occur in the Antarctic, Greenland and the
Nearctic realm. They have short, moist, and
moderately warm summers with fairly long,
cold winters.
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The Atacama desert is, according to NASA, National Geographic and many other
publications, the driest desert in the world
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• The heaviest rainfall of the spring is usually in
April or May. In some areas, rainfall can be
heavy in autumn.
• The burrowing habit also applies to carnivores
like the badger, kit fox, and coyote.
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The 10 largest deserts
Rank Desert Area (km²) Area (mi²)
1 Antarctic Desert
(Antarctica) 13,829,430 5,339,573
2 Arctic 13,700,000+ 5,300,000+
3 Sahara (Africa) 9,100,000+ 3,320,000+
4 Arabian Desert (Middle
East) 2,330,000 900,000
5 Gobi Desert (Asia) 1,300,000 500,000
6 Kalahari Desert (Africa) 900,000 360,000
7 Patagonian Desert
(South America) 670,000 260,000
8 Great Victoria Desert
(Australia) 647,000 250,000
9 Syrian Desert (Middle
East) 520,000 200,000
10 Great Basin Desert
(North America) 492,000 190,000
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Which is the biggest cold desert in
India siachen glacier
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The Sahara is the world's largest hot desert
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The Thar Desert, also known as the Great Indian Desert, is a
large, arid region in the northwestern part of the Indian
subcontinent.
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The region surrounding Aravalli hills near
Ranthambore, Rajasthan
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5/1/2013 Author-Guru IB/ESS 186