the characteristics of life - pearland high · pdf filecharacteristics of life. ......
TRANSCRIPT
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Pre-AP BiologyP e a r l a n d H i g h S c h o o l
Ecology
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What is Biology?
Biology is the study of life!
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What does it mean to be alive?
Characteristic of Life Video
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The Eight Characteristics of LifeMust have all to be living
1. Organization & the presence of one (unicellular) or more cells (multicellular)
2. Response to a stimulus (stimuli)3. Homeostasis4. Metabolism: nutrients5. Growth & Development6. Reproduction7. Change through time8. Universal Genetic Code: DNA
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Concept Map: Characteristics of life
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Ecology
Ecology: the study of how living things interact with their physical environment
Eco
logy
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Ecological
Organization
1. Organism (individual)
Anything that possesses all of the characteristics of life. Species: a group of organisms that can mate & produce a fertile offspring
2. Population: All members of a species live in one place at one time
3. Community: a collection of interacting populations in an area
4. Ecosystem: includes all of the organisms & the non-living environment.
5. Biosphere: the portion of the earth where all life exists.
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Ecological Organization*community members in the ecosystem must interact to maintain
a balance.
Put in order:
(small to large)
communitypopulationbiosphereorganismecosystem
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Levels of Organization
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Biomes• Biome: a large region characterized by a specific
type of climate & certain plant and animal communities.
• A certain biome may exist in more than one location on earth.
• Biomes are terrestrial (dry) or aquatic (wet)
• Dependent on:
• Temperature
• Solar radiation
• Precipitation
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12
Biotic and Abiotic Factors
• Biotic factors: Living Factors of the environment
– Examples Predators, food,
• Abiotic factors- the nonliving parts of an environment.
• Examples temperature, moisture, light, and soil.
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Biotic Factors
• Biotic factors: living factors which affect the ability of organisms to survive and reproduce
– Examples:• other organisms, such as a predator, food source
Can an abiotic factor such as RAIN affect many biotic factors?
Rain - ________ - ________ - _________grass mole eagle
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Abiotic vs Biotic Factors
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Ecosystems
An ecosystem is self-sustaining if:
1. A constant source of energy
is supplied.
2. Living things use this energy and
convert into organic molecules
3. A cycling of materials between
organisms and their environment
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Resources Organisms with similar needs may compete with each
other for resources like:
Limiting Factors
Food
Space
Water
Air
Shelter (ADD)
Determines the types of organisms that exist in that
environment
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Nutritional Relationships
• Two types : Autotrophs & Heterotrophs1. Autotrophs: organisms that synthesis their own food.(plants)
2. Heterotrophs: can NOT synthesize their own food and are dependent on other organisms for their food
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Energy Flow
Energy flows through
Ecosystems
Producers = autotrophs
Consumers = heterotrophs
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Autotrophs = Producer
AKA
Also Known As
PRODUCERcaptures energy and transforms it into
organic, stored energy for the use of living
organisms.
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Photoautotrophs
Producer That Captures Energy from the
sun by:
–Photosynthesis
• Adds Oxygen to the atmosphere
• Removes Carbon Dioxide from
the Atmosphere
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Photoautotroph EXAMPLES
• On Land
–Plants
• In The Sea
–Algae
• Tidal Flats & Salt Marshes
–Cyanobacteria
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Chemosynthesis
• Capture energy from
the bonds of inorganic
molecules
– No light needed
–Hydrogen Sulfide
–The Process Is
Called:
CHEMOAUTOTROPH
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Know the difference
between
Photosynthesis
&
Chemosynthesis
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Feeding Relationships
Key Concept:
Energy flows through an
ecosystem in one
direction
from producers to various
levels of consumers
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Energy Flow in an Ecosystem
• Food chain: a single pathway of feeding relationships among organisms that involves the transfer of energy.
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Feeding Relationships
• Food Chain
–Simple Energy path through an
ecosystem
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Food Web
More realistic path through
an ecosystem
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Trophic LevelsEach Level In A Food Chain or Food
Web is a Trophic Level.
• Producers
– Always The First Trophic Level
– How Energy Enters The System
• Herbivores
– Second Trophic Level
• Carnivores/Omnivores
– Make Up The Remaining Trophic Levels
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Each level
depends on
the one
below it for
energy.
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Food Webs, Food Chains & Pyramids
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Feeding Relationships Questions
Page 6 Page 7
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Consumers• Herbivores
– Eat Only Plants
• Carnivores
– Eat Only Other Animals• Omnivores (That’s You)
– Eat Plants & Animals• Detritivores
– Feed On Dead Plant & Animal Remains• Decomposers
– Breaks down organic matter– Fungi & Bacteria
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Heterotrophs eat other organisms to obtain energy.
• Omnivores (That’s You)
– Eat Plants & Animals
• Detritivores– Feed On Dead Plant & Animal Remains
• Decomposers– Breaks down organic matter
– Fungi & Bacteria
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Types of Carnivores
Predators: animals which kill and
consume other animals (prey)
Prey: animals which are killed by predators
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More Predator/Prey Relationships
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Types of Carnivores
Scavengers: animals that feed on other
animals that they have not killed
Examples: crows vultures hyenas
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Which is the Predator?
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Deer Predation & StarvationGraphing Activity
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Population Growth3 factors that can affect population:
1. - number of births
2. - number of deaths
3. - number of individuals that enter or leave the population
• Immigration – movement of individuals into an area (entering)
• Emigration – movement of individuals out of an area(exiting)
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Exponential
Population Growth
• Logistic growth (S curve) – occurs when a population’s growth slows or stops (limits on growth)
• Exponential growth (J curve) – occurs when the individuals in a population reproduce at a constant rate (no limits on growth)
• Carrying capacity –largest number of individuals of a population that a given environment can sustain.
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In reality carrying capacity looks like this
Carrying capacity
• Limiting factor – a factor that causes population growth to decrease
Any biotic or abiotic factor that restricts the existence, numbers, reproduction, or distribution of organisms
Human Disturbances are NOT A limiting factor*** They're Density-Independent factors
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2 kinds of limiting factors:
• Density-dependent limiting factor– Exp. competition, predation,
parasitism, disease
• Density-independent limiting factor – Exp. Unusual weather, natural
disasters, seasonal cycles, certain human activities
biotic
abiotic
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Video
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Symbiotic Relationships
• Symbiosis: living together with another organism in close association
–Types of symbiosis:• Commensalism
• Mutualism
• Parasitism
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Types of Symbiosis
• Commensalism: one organism is benefited and the other is unharmed (+,0)
– Example: barnacles on whales, orchids on tropical trees
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Types of Symbiosis
• Mutualism: both organisms benefit from the association (+,+)
– Example: Nile crocodile opening its mouth to
permit the Egyptian plover to feed on
any leeches attached to its gums.
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Types of Symbiosis
• Parasitism: one organism benefits at the expense of the host (+,-)
– Example: tapeworm and heartworm in dogs athlete's foot fungus on humans
leech sucking blood from host
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Symbiosis
Mutualism Parasitism
Commensalism
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Good Buddies Activity
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Homework
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Energy Pyramid
• shows the amount of energy available at each trophic level
– Only use 10% of the energy
– 90% is lost as HEAT
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Biomass Pyramid
• Shows the amount of living organic matter at each trophic level
• Most biomass??
– Base (bottom) of the pyramid
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Pyramid of Numbers
• Shows the relative number of individuals at each trophic level
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Aquatic Food Webs & Pyramids
PG. 8 PG. 9
PG. 10 PG. 11
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Ecological 3D Pyramid
Homework – LAB GRADE
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Succession
• Succession: a gradual process of change and replacement of populations in a community.
• 1. Primary Succession: The development of plant communities in an area that has never supported life. In an area that contains no Soil
examples: bare rock, lava flow or glaciers.• Pioneer organisms: the first organisms to inhabit a given location
(example: lichens on bare rock)
• 2. Secondary Succession: is the change of species that follows disruption of an existing community. In an area that contain soil
Example: created by natural disasters or human activity
– Ecosystems tend to change until a climax community is formed.
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Climax Community
• Climax community: a community that has reach a stable state.
– populations remain stable and
exist in balance with each other
and their environment
– ecosystems may reach a
point of stability that can last for
hundreds or thousands of years
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Succession Example
• If the PHS football field is not mowed, would it be primary or secondary succession?
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Biodiversity• Biodiversity: the differences in living
things in an ecosystem
1. Increased biodiversity increases the stability
of an ecosystem.
2. Increased biodiversity increases the chance that at least some living things will survive.
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High Biodiversity vs. Low BiodiversityWhich one has the most Biodiversity
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Ecology Web Quest
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Habitat & Niche• Habitat is the
place a plant or animal lives
• Niche is an organism’s role in life
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Habitat and Niche Worksheet
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Material Cycles
• Material Cycles:
– In a self-sustaining ecosystem, materials must be recycled among the organisms and the abiotic environment.
– The same materials can be reused.
– Examples of Cycles:
• Water
• Carbon-Oxygen
• Nitrogen
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Water Cycle
• Water Cycle: involves the processes of
– Photosynthesis
– Transpiration
– Evaporation and condensation
– Respiration
– Excretion
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Water Cycle
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Carbon-Oxygen Cycle
oxygen
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Carbon-Oxygen Cycles
• Carbon-Oxygen Cycle:
involves the processes of
– Respiration
– Photosynthesis
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Nitrogen Cycle
• Nitrogen Cycle:
– Organisms must have nitrogen to produce proteins and amino acids
– Living things cannot use nitrogen gas in the air
– Life is possible due to nitrogen-fixation
• Nitrogen Fixation: Nitrogen gas is converted to ammonia
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Nitrogen Fixers
• Legumes: peas and beans contain nitrogen-fixing bacteria in their roots
– Clover and alfalfa are other examples of nitrogen fixers
Bean
Plant
Alfalfa
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Nitrogen CycleNitrogen Gas (N2)
Nitrogen fixation
Nitrogen-fixing
bacteria in plant
roots
Animals
eating
plantsDecomposition
Soil
bacteria
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Biomagnification and the Infamous DDT--Video
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Cycling matter through ecosystems
Homework
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Ecological Relationships Concept Map
Homework