ecology - jenny hendricksjennyhendricks.weebly.com/uploads/1/6/5/4/16542686/interdependence...•...
TRANSCRIPT
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Ecology
Ch 4-6
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Video
• Top 10 disasters
• Man-made disasters
• Time magazine
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Ecology
• Study of the interactions between living
things and their environment
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Levels of Organization in
Ecology 1. Biosphere – thin volume of Earth and its
atmosphere that supports life
2. Ecosystem – all living and nonliving parts
of a particular place
3. Community – all interacting organisms
living in a area
4. Population – all members of a species
living in one place
5. Organism – one living thing in a population
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1
2
3
4
5
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ORGANISM
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POPULATION
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COMMUNITY
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ECOSYSTEM
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BIOSPHERE
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Ecosystem/Organism
• Within an ecosystem, the two types of
environmental factors are:
– Biotic = living things
• Ex) bacteria, protists, fungi, plants, and animals
– Abiotic = nonliving things
• Ex) rocks, dirt, air, sun
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Ecosystem/Organism
• Habitat = place where organism lives
• Niche = organism’s role in the environment
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Practice – 10 min 1. What abiotic factors do you need in order
to survive?
2. Pick an organism from any habitat and
explain how the following abiotic factors
impact the organism (if applicable) when
they change to the extremes
– Temperature, oxygen levels, humidity, salt
levels, pH levels
3. List 2 traits (adaptations) and 2 behaviors
that plants or animals have that helps them
survive when the environment changes
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Organisms Responses to Changing
Environments: • Tolerance curve – graph of performance
versus an environmental variable
– Ex) If a fish’s water gets too hot or too cold,
then they will slow down then eventually die
• Acclimation – adjustment to an abiotic
factor
– Ex) increase in red blood cells when you go
up in altitude
• Migration – moving to another more
favorable habitat
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Conservation
• Conservation biologists have taken advantage of
imprinting by aiding the endangered species the
whooping crane
– Birds are taught a new migration route by
following a person flying a crane wearing a
crane suit
• Acts as a surrogate parent
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Video
• Whooping crane
• Whooping crane ground training
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Nutrient Cycles
• Why is it important to recycle nutrients
such as C, O, N, P, and water?
– Matter (elements and compounds) must be
put back into the ground (recycled) in order
for organisms to be able to use them again
– Necessary for life to continue
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Water Cycle
• Circulates freshwater between the earth’s surface and the atmosphere. – The sun provides heat to start evaporation of water
molecules.
– The sun also provides the energy to power winds and ocean currents.
– Respiration also provides water evaporation to the atmosphere.
– Plants also release water into the atmosphere by the process of transpiration.
– The water cools to form clouds which then precipitation.
– Water runoff from the mountains to the rivers, lakes, streams, and groundwater
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Carbon Cycle
• This is the cycling of carbon between carbon dioxide and organic molecules
• The main component of organic compounds is carbon. – Carbon passes to other organisms through the food
chain or web.
– Plants take in carbon through photosynthesis
– It the returns to the atmosphere and the Earth through respiration, excretion or decomposition after death.
– Coal and other fossil fuels can form from decomposing organic matter and burning it off, which called combustion.
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REVIEW
• Photosynthesis
– Makes glucose (food)
– Chloroplast
– CO2 + H2O + Light energy Glucose + O2
• Cell Respiration
– Makes energy (ATP)
– Mitochondria
– Glucose + O2 CO2 + H2O + Energy (ATP)
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Nitrogen Cycle • Most abundant gas in the atmosphere at 78%
• The nitrogen cycle converts nitrogen into ammonia, nitrite, and then nitrate so that plants and animals may use it. – Nitrogen fixation is the conversion of nitrogen gas
into nitrate by several different bacteria.
– This process releases nitrogen from the atmosphere into the soil for plants to use
– Plants use this nitrogen to synthesize nucleic acids and proteins.
– The nitrogen passes through the food chain to other animals.
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• Death and decomposition put nitrogen back
into the ground
• Decomposers release ammonia as they break
down plant and animal remains.
• The bacteria then convert nitrate and nitrite into
nitrogen gas and is released into the
atmosphere = denitrification
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Phosphorous Cycle
• Phosphates are introduced into the soil through weathering, or breakdown of sedimentary rocks. – Plants and fungus absorb and the phosphate.
– The phosphate then moves through the food chain through consumption.
– It then returns to the soil as waste or decomposed material
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Energy Flow
• Food chain = linear feeding relationship
from one trophic level to the next
• Trophic level = organisms position in the
food chain or web
• Food web = interconnected food chains
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Energy Flow
• 4 parts: producers, primary consumers,
secondary consumers, tertiary consumers
• Sun is the ultimate source of energy
• Only 10% of the energy from one trophic
level gets passed to the level above
– Reason: some energy is lost as heat,
organisms need energy to live, and not all
organisms get eaten
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Community
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Community
• Can organisms share a habitat, niche, or
both in a community?
– Share a habitat, but not a niche because of
competition for resources
– One species will win out and the other will be
forced to find another resource or they will die
off (natural selection)
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• Natural selection = the environment
determines if a trait in a population is
beneficial or not to aid in survival
• Ultimately, it will lead to the species
reproducing and passing on the beneficial
trait to create an adaptation
• Variations in traits occur from mutations,
random fertilization, independent
assortment, and crossing over
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Important to Remember:
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Examples of Natural Selection
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Succession
• Other factors that contribute to changes in
communities is succession
• Succession = building a community over
time
– Two types: Primary and Secondary
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Primary Succession
• Building up of a community where life DID
NOT previously exist
– Ex) Stone Mountain, rocks, sand dunes
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Secondary Succession
• Building up of a community where life DID
previously exist
– Ex) natural disaster, forest fire
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Pioneer Species
• First species to grow in an area
– Ex) lichen (fungus + algae), moss
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Climax Community
• Maximum amount
of species that
can live in an area
– End phase of
development in a
community where
no more life can
move into an area
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Species Interactions (Symbiosis)
• 1) Predation - act of one organism killing
another for food
– Ex) snake hunting a mouse
• 2) Competition – fighting for resources
– Ex) 2 lions fighting for a zebra
• 3) Parasitism – one organism is harmed
and the other benefits
– Ex) ticks, mosquitos
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Species Interactions (Symbiosis)
• 4) Commensalism – one organism
benefits and the other is neither harmed or
helped
– Ex) fish swimming under a shark to eat the
scraps
• 5) Mutualism – both organisms benefit
– Ex) Bees and flowers
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Population
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Population
• Population Growth Rate
– Birth rate – Death rate = Growth rate
• How do we determine population sizes in
the real world?
– Sample of larger population, mark and
recapture technique
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Factors that affect population growth:
Density-independent factors:
• Factor that influences a population
regardless of how many are in the population
– Ex) natural disaster, floods
Density-dependent factors:
• Factor that will impact the population if the
population changes or is very dense
– Ex) competition for resources, disease
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Population
• Exponential Model of
Population Growth
• Logistic Model of
Population Growth
• Carrying Capacity =
maximum amount of
organisms that can live off
the resources in an area
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Biomes
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Factors that define a biome
• Climate (Precipitation and Temperature)
• Unique Plant and Animal life
• Video: Intro to Biomes
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Tundra
• Cold and largely treeless, moss and
grasses/wildflowers
• Has layer of permafrost (permanently
frozen soil)
• little precipitation and short growing
season, nutrient poor soil
• reindeer and caribou / polar bears and
penguins
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Tundra
• Temperature: -25 to 5°C
• Precipitation: 0 to 20 cm
• Soil: Permafrost
• Vegetation: Mosses, lichen, and short grasses
• Location: Northern N. America, Europe, and Asia
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Taiga
• Cone- bearing trees
• Plants adapted to long cold winters, short
summers, and nutrient poor soil
• Animals either hibernate in winter or
migrate, wolves and rabbits
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Taiga
• Temperature: -20 to 20 °C
• Precipitation: 5 to 25 cm
• Soil: Nutrient poor
• Vegetation: Conifers
• Location: Northwestern US, Canada; just
under Tundra
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Deciduous Forest
• Trees lose leaves in the fall
• have pronounced seasons, warmer
winters and longer summers
• deer, birds, small animals, and bears
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Deciduous Forest
• Temperature: 10 to 20 C
• Precipitation: 15 to 30 cm
• Soil: fertile
• Vegetation: Broad leaf
trees
• Location: Eastern US,
Europe, Japan
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Grassland
• Dominated by grasses
• Too dry to support trees
• Rich, fertile soil
• Prairie dogs and snakes
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Grassland
• Temperature: 5 to 30 C
• Precipitation: 20 to 35 cm
• Soil: fertile
• Vegetation: grasses, herbs, shrubs
• Location: Central US
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Desert
• Very little precipitation
• Vegetation is sparse except for plants that
have adapted to dry conditions
• Not all are hot
• Jackrabbits and lizards
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Desert
• Temperature: 10 to 35 C
• Precipitation: 15 to 25 cm
• Soil: sandy
• Vegetation: cacti,
bushes
• Location: US, Africa,
Mexico
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Savanna
• Tropical or subtropical savannah
• Have alternating wet and dry seasons
• Plants and animals deal with long periods
without rain, some umbrella trees
• Soil low in nutrients compared to
temperate grasslands
• Zebra and lion
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Savanna • Temperature: 25 to 30 C
• Precipitation: 30 to 35 cm
• Soil: compact
• Vegetation: grasses and trees
• Location: Africa, N. Australia
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Tropical Rainforest
• Lots of rainfall
• Tall trees
• Stable, year round growing season
• Large diversity of life
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Tropical Rainforest • Temperature: 25 to 30 C
• Precipitation: 30 to 40 cm
• Soil: nutrient poor
• Vegetation: large trees, large diverse
• Location: S. and C. America, Africa
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Aquatic Biomes
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Marine
• Contains salt water
• Many zone divide up the ocean and
different organisms are found in different
zones
– Ex: Ocean zone (open ocean) – whales
Intertidal zone (beach) – ghost crab
Photic zone (has light) – algae and
seaweed
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Zones of the Ocean
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Oceanic Zone
• Characteristics: Open sea
• Type of Water: Marine
• Plants and Animals: Whales, dolphins,
algae, seaweed
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Neritic Zone
• Characteristics: Over continental shelf,
can contain coral reefs
• Type of Water: Marine
• Plants and Animals: Sharks, sponges,
shrimp, tuna, kelp
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Intertidal Zone • Characteristics: Area is exposed to air part of the
day due to tides
• Type of Water: Marine
• Plants and Animals: sea stars, sand dollars, sea palms, grasses
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Other Zones
• Photic – has light
• Aphotic – no light
• Pelagic – area from surface to deep into
the ocean
• Benthic – lowest zone of the ocean along
the ocean floor
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Estuaries/Wetlands
• Characteristics: Mixture of fresh and salt water,
located along the coast and behind islands
• Type of Water: Fresh and Salt
• Plants and Animals: Oysters, crabs, birds,
mangrove trees, marsh grass
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Freshwater: Lakes and Ponds
• Characteristics: Inland body of water, can vary in size with less than 1% salt content
• Type of Water: Fresh
• Plants and Animals: Fish, frogs, ducks, lilly pads, trees
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Freshwater: Rivers and Streams • Characteristics: Running water, curve or
meander, make up watersheds
• Type of Water: Fresh
• Plants and Animals: Salmon, dragonflies, algae, trees