11

22

CH.3-1 WHAT IS BIOLOGYCH.3-1 WHAT IS BIOLOGY

INTERACTIONS AND INTERDEPENDENCE

• ___________ is the scientific study of interactions among ____________ and between organisms and their __________, or surroundings.

• The world itself contains many houses, and the largest house that contains all portions of the planet is called the _____________.

Ecologyorganisms

environment

Biosphere

33

ECOLOGY =

Organisms + Environment

44

• The biosphere consists of ______, ______, and _______ or the atmosphere.

• Interactions within the biosphere produce a web of __________________ between organisms and the environment in which they live.

land waterair

interdependence

Land

Water

Air

55

LEVELS OF ORGANIZATION

• What are the six levels of organization that ecologists study?

Biosphere

Biome

66

1) Some ecologists study the interactions between a particular kind of organism and it’s ____________. This type of study is at the ________ level. (organisms that can mate with each other and produce fertile offspring)

2) Other ecologists study _____________, or groups of ____________ that belong to the same species.

3) At another level ecologists study the _______________, or different populations that live together.

surroundingsspecies

populationsindividuals

communities

77

Different Different speciesspecies of frogs of frogs

Marsh Frog Glass tree frog

Green poison arrow frog Dart Frog

88

Population

population

individual

population

A community in the ocean

99

4) Some ecologists study a particular ecosystem. An ____________ is a collection of all the ______________ that live in a particular place, with nonliving, or physical, environment.

5) When ecologists study larger ecosystems with the same climate and similar communities they are studying ________.

6) The largest area that ecologists can study is the ___________. (bottom of the ocean to the top of the atmosphere)

ecosystemorganisms

biomes

biosphere

1010

Ecosystem includes physical Ecosystem includes physical environment!environment!

Physical Environment:•Water temperature 20°C or 30°C 60°F or 78°F•Amount of light Lots of light

1111

Tropical Rainforest EcosystemTropical Rainforest Ecosystem

1212

BiomesBiomes of the world of the world

1313

Population & Species

Community

Ecosystem

Biome

Biosphere

individual

1414

ECOLOGICAL METHODS

• Ecologists use a wide range of tools and techniques to study the living world. (radio tags)

• Scientists use modern ecological research using three basic approaches:

1) ____________- is the first step in asking ecological questions.

2) ____________- can be used to solve and test an hypothesis.

Observing

Experimenting

1515

3) ______________- most ecological phenomena occur over a long period of time or such a spatial scale that they are difficult to study.

This is why ecologists will make models to gain insight into such areas. Many of these type of studies consist of _______________ formulas based on data collected through observations and experiments.

Modeling

mathematical

1616

CH. 3-2 ENERGY FLOWCH. 3-2 ENERGY FLOW• At the core of every organism’s interaction

with the environment is its need for __________ to power life’s processes.

PRODUCERS

• Without a constant input of energy, living systems cannot function. _________ is the main energy source for life on Earth.

energy

Sunlight

1717

• In a few ecosystems, some organisms obtain energy from a source other than sunlight.

• Some types of organisms rely on the energy stored in inorganic ___________________ (Ex: mineral water that flows underground or boils out of hot springs and undersea vents is loaded with chemical energy).

Chemical compounds

1818

• Only plants, some algae, and certain bacteria can capture energy from sunlight or chemicals and use that energy to produce food. These organisms are called ___________ (producers).

• The best known _____________ are those who harness solar energy through a process known as ________________.

• During photosynthesis, these autotrophs use light energy to power chemical reactions that convert ___________________ and water into oxygen and energy-rich carbohydrates such as _________________________.

autotrophsautotrophs

photosynthesis

Carbon dioxide

Starches and sugars

1919

sugars

2020

LIFE WITHOUT LIGHT

• When organisms use chemical energy to produce carbohydrates, the process is called _________________.

• This process is performed by several types of bacteria (Ex: volcanic vents on the deep ocean floor, hot springs in Yellow Stone Park).

chemosynthesis

2121

NO LIGHT!Use chemicals

chemical

2222

CONSUMERS

• _____________and many bacteria-cannot harness energy directly from the physical environment as autotrophs do.

• Organisms that rely on other organisms for their energy and food supply are called __________________.

• Heterotrophs are called ______________.

Animals, fungi,

heterotrophsconsumers

2323

• There are many different types of heterotrophs.

• _________=plants (cows and caterpillars)

• ___________=animals (snakes and owls)

• ___________=plants and animals (humans and bears)

• _____________ feed on plants and animal remains (vultures and earthworms)

• _________________ break down organic matter (bacteria and fungi).

Herbivores

CarnivoresOmnivores

Detritivores

Decomposers

2424

An herbivore eats only plants.

Cow

Caterpillar

Deer

2525

A A carnivorecarnivore eats animals. eats animals.

Snake Owl Dog

2626

An omnivore eats plants and An omnivore eats plants and animals.animals.

HumanBear

2727

A detritivore eats dead plants and A detritivore eats dead plants and animals.animals.

earthworm

crabvulture

2828

A decomposer breaks down living A decomposer breaks down living things.things.

Fungi

Bacteria

2929

FEEDING RELATIONSHIPS

• What happens to energy in an ecosystem when one organism eats another?

• Energy flows through an ____________ in one direction, from the sun or inorganic compounds to ________________ and then to various ____________________.

ecosystem

autotrophs

heterotrophs

3030

Sun

energy

energy

energy

energy

3131

FOOD CHAINS• The _________ stored by producers can

be passed through an ecosystem along the ___________, a series of steps in which organisms transfer energy by eating and being eaten.

FOOD WEBS• When the ___________ relationships

among the various organisms in an ecosystem form a network full of complex interactions, ecologist describe these relationships as a ____________.

energy

food chain

feeding

food web

3232

3333

3434

3535

3636Decomposer

3737

3838

3939

4040

TROPHIC LEVELS

• Each step in a food chain or food web is called a _________ level.

• _______________ make up the first level.

• ________________ make up the second, third, or higher trophic levels.

• Each consumer depends on the trophic level _________ it for energy.

trophicProducers

Consumers

below

4141

Producer

Consumers

1st level

2ndlevel

3rd level4th level

Trophic LevelsTrophic Levels

4242

Ecological Pyramids

• The amount of energy or matter in an ecosystem can be represented by an __________________________.

• An ecological pyramid is a diagram that shows the relative amounts of _______________contained within each trophic level in a food chain or food web.

ecological pyramid

energy or matter

4343

• There are 3 different kinds of pyramids:

1. Energy Pyramids

2. Biomass Pyramids

3. Pyramids of Numbers

4444

Energy Pyramid• There is no limit to the number of trophic

levels that a food chain can support but only one part of the energy that is stored in one level is passed on to the next level. This is because organisms use as much energy as they consume for life processes (Ex: respiration and movement).

• Only about ______ of the energy available within one trophic level is transferred to organisms at the next level.

10%

4545

Energy Pyramid

4646

Biomass Pyramid

• The total amount of ____________within a given trophic level is called __________.

• Biomass is usually expressed in terms of _________ of organic matter per unit area.

• A biomass pyramid represents the amount of ___________________ available for each trophic level in an ecosystem.

living tissuebiomass

grams

potential food

4747

Biomass Pyramid

4848

Pyramid of Numbers

• Ecological pyramids can also be based on the __________ of individual organisms at each trophic level.

numbers

4949

Pyramid of Numbers

5050

5151

3-3 CYCLES OF MATTER

Recycling in the Biosphere

• Unlike the one-way flow of energy, matter is recycled within and between _______________.

• Elements, chemical compounds, and other forms of matter are passed from one organism to another from one part of the biosphere to another through ________________ cycles.

ecosystems

biogeochemical

5252

The Water Cycle• All living things require _________ to

survive.• Water moves between the ocean,

atmosphere, and land.• Water ________ enter the atmosphere as

water vapor, a gas, then they evaporate from the ocean or other bodies of water.

• The process in which water changes from liquid form to an atmospheric gas is called ______________.

water

molecules

evaporation

5353

• Water can also enter the atmosphere by evaporating from the leaves of plants in the process of _________________.

• Water returns to the Earth’s atmosphere in the form of ________________-rain, snow, sleet, or hail.

• On land, much of the precipitation runs along the surface of the ground until it enters a _________ that carries the runoff back to the ____________.

transpiration

precipitation

riverocean

5454

Seepage

5555

5656

WATER CYCLE

5757

Nutrient Cycles• The food you eat provides energy and

chemicals that keep you alive.• All the chemical substances that an

organism needs to sustain life are its _____________.

• Every living organism needs nutrients to build tissues and carry out essential ___________________.

• Like water, nutrients are passed between organisms and the environment through __________________ cycles.

nutrients

life functions

biogeochemical

5858

5959

• These cycles are: ________________________________.

The Carbon Cycle

• ___________ is the key ingredient of living tissue.

• Carbon is an important component of _________________ and is also found in rocks.

• Carbon and oxygen form _____________ gas (CO2), and important component of the atmosphere.

Carbon, nitrogen, and the phosphorus

Carbon

animal skeletons

Carbon Dioxide

6060

6161

6262

6363

CARBON CYCLE

6464

• Four main processes move carbon through its cycle:

1. ____________: photosynthesis, respiration, and decomposition, take up and release carbon and oxygen.

2. ____________: erosion and volcanic activity, release carbon dioxide into the atmosphere and oceans.

Biological

Geochemical

6565

3. _______________________: burial and decomposition of dead organisms and their conversion under pressure into coal and petroleum (fossil fuels) store carbon underground.

4. _________________: mining, cutting, and burning forests, and burning fossil fuels, release carbon dioxide into the atmosphere.

Mixed biogeochemical

Human activities

6666

The Nitrogen Cycle

• All organisms require __________ to make amino acids which in turn are used to build proteins.

• Nitrogen gas makes up _____ of Earth’s atmosphere.

• Nitrogen also exists in several forms in the __________ and other large water bodies.

• Human activity adds nitrogen to the biosphere in the form of ___________.

nitrogen

78%

ocean

nitrate

6767

• Although nitrogen gas is most abundant from of nitrogen on earth, only certain types of bacteria can use this form directly. Such bacteria, which live in the soil and on the roots of plants called legumes, convert nitrogen gas into ammonia in a process known as ____________________.

• Other soil bacteria convert nitrates into nitrogen gas in a process called _________________.

Nitrogen fixation

denitrification

6868

6969

• This process releases nitrogen into the atmosphere once again.

The Phosphorus Cycle• _________________ is essential to living

organisms because it forms part of important life-sustaining molecules such as DNA and RNA.

• Phosphorus is not common in the ______________.

• Phosphorus ____________ enter the atmosphere.

Phosphorus

biospheredoes not

7070

• Phosphorus remains mostly on _______ in rock and _____________, and in ocean sediments.

• Phosphorus exists in the form of _____________ phosphate.

• Organic phosphate moves through the food web, from ________________________, and to the rest of the ecosystem.

• Figure 3-15

landsoil minerals

inorganic

producers to consumers

7171

7272

Nutrient Limitation• Ecologists are often interested in the

primary productivity of an ecosystem, which is the rate at which ______________ is created by producers.

• If a nutrient is in short supply, it will limit an organism’s growth.

• When an ecosystem is limited by a single nutrient that is scarce or cycles very slowly, this substance is called a __________________.

organic matter

limiting nutrient

7373

• An example is farmers adding _____________ to their crops to boost their productivity.

• Fertilizers contain 3 important nutrients: nitrogen, phosphorus, and potassium.

• The open oceans of the world can be considered nutrient _______ environments compared to the land.

• When an aquatic ecosystem receives a large input of a limiting nutrient, the result is often an immediate ___________ in the amount of algae and other producers.

fertilizers

poor

increase

7474

• This result is called an __________.

• There are more nutrients available, so the producers can grow and reproduce more quickly. If there are not enough consumers to eat the excess algae, conditions can become so favorable for growth that algae cover the surface of the water.

• Algae blooms can often disrupt the _____________ of an ecosystem.

Algal bloom

equilibrium

7575