Biological Processes

Factors That Yield Environmental Differences

Factors That Affect Population Density and Dispersion

Animal Behavior

Types of Behavior

Terrestrial biomes

Aquatic biomes

Lakes

Tropical Forest

Desert

Savanna

Chaparral

Temperate Grassland

Northern Coniferous Forest

Temperate Broadleaf Forest

Tundra

Precipitation: In tropical rain forest -> Constant rainfall (200-400 cm) In tropical dry forests -> precipitation is highly seasonal (150-200 cm) with 6-7 month dry season

Temperature: Little seasonal variation. 25-29 degrees celsius. High year round

Dominant animals:

Locations: Equatorial & Subequatorial regions

Dominant plants:

Dry forest

Rain forests

Has trees that grow above a closed canopy, layers of shrubs and herbs (small nonwoody plants)

Has fewer layers of trees, trees drop their leaves during the dry seasons, & many thorny shrubs

There is insects, spiders, arthropods, amphibians, reptiles, birds, mammals. Animal diversity is higher in the tropical forests than in any other terrestrial biome

Locations: Gobi desert of north central Asia, north & south latitudes

Precipitation: Precipitation is low & highly variable

Temperature: Variable seasonally & daily

Dominant plants: cacti, deeply rooted shrubs, & herbs. Many of the plants exhibit C4 or CAM photosynthesis

Dominant animals: Snakes, lizards, scorpions, beetles, birds, & seed eating rotants

Locations: Occurs in equatorial & subequatorial regions

Precipitation: Seasonal rainfall & the dry season can last up to 8 or 9 months

Temperature: Warm year round

Dominant plants: Plants are thorny and have small leaves. Most of the ground is covered by grasses and forbs (small nonwoody plants)

Dominant animals: Wildebeests, zebras, lions, hyenas, insects and termites

Locations: North America, Spain, South France, Chile, & South Africa

Precipitation: Highly seasonal, rainy winters, & dry summers

Temperature: Fall, winter, & spring are cool

Dominant plants: Grasses, herbs, shrubs, small trees, & evergreen leaves that reduce water loss

Dominant animals: Deer, goats, amphibians, reptiles, birds, & insects

Locations: South Africa, Hungry, the pampas of Uruguay & Argentina, the steppes of Russia, & the prairies of Central North America

Precipitation: Highly seasonal, dry winters, wet summers, & periodic droughts

Temperature: Cold winters & hot summers

Dominant plants: Grasses & forbs that survive droughts & fires

Dominant animals: Bison, wild horses, prairie dogs, along w/burrowing animals

Tropical Rain Forest

Tropical Dry Forest

Locations:North America & Eurasia to the edge of the arctic tundra

Temperature: Usually cold winters & hot summers

Precipitation: Common droughts, annual precipitation ranges from 30 - 70 cm & the U.S. Pacific Northwest are temperate rain forests

Dominant plants: Northern coniferous forests have more cone-bearing trees, like pine, spruce, fir, & hemlock. Shrub & herb are less seen in these forests

Dominant animals: Moose, brown bears, Siberian tigers, & insects

Locations: Middle latitudes, Chile, South Africa, Australia, & New Zealand

Dominant plants: Deciduous trees, a shrub & a herb layer, closed canopy. There are few epiphytes. Australia has has evergreen eucalyptus trees

Temperature: Winter temperatures average 0 degrees & summer temperatures are around 35 degrees Cel which are hot & humid

Dominant animals: Mammals, birds, insects, & many of the animals hibernate in the winter

Precipitation: Large amounts fall during all seasons, including summer rain, & some forests have snow

Locations: Arctic region

Temperature: Cold winters & cool summers

Dominant plants: A mixture of mosses, grasses, forbs, dwarf trees, shrubs & lichens

Precipitation: Precipitation averages from 20 - 60 cm

Dominant animals: Oxen, bears, wolves, foxes, & birds that migrate in the winter

Physical characteristics: Standing bodies of water. EX: Ponds. Light decreases w/depth

Chemical characteristics: Salinity, O2 concentration, & nutrient content differ among lakes

2 Types of lakes

Oligotrophic lakes

Eutrophic lakes

Nutrient poor & O2-rich

Nutrient-rich but often depleted of O2 in the deepest zone in the summer & if covered w/ ice in winter

Westlands

Physical characteristics: A habitat that is overwhelmed with water & supports plants adapted to water saturated soil

Chemical characteristics: Both H2O & soil are periodically low in dissolved O2 b/c of high organic production by plants & decomposition by microbes. There is a high capacity to filter dissolved nutrients & chemical pollutants

Streams & Rivers

Physical characteristics: Speed & volume of the streams & rivers flow. STREAMS - Headwater streams are usually clear, cold, & turbulent whereas further downstream, tributaries may have formed RIVERS - where the water is warmer mostly & more turbid suspended sediment

Chemical characteristics: Salt & nutrient content of streams & rivers increases from the headwaters -> the mouth

Stream

River

Headwaters: Generally O2-rich

Downstream: There may also be substantial O2 except where there has been organic enrichment

Innate

Fixed Action pattern

Imprinting

Associative Learning

Trial & Error (Operant conditioning)

Habituation

Observational Learning

Def: Learning from observation

Insight

Def: Try & if it doesn't work, try again

Def: Not a learned behavior. Born with

Def: A series of acts that occur behaviorally in animals. It is unchangeable & carried out to completion once started

Def: A lessened response to a stimulus after repeated exposures to it

EX in video: A stream of hikers take photos of squirrels and those squirrels become used to the traffic so they are more audacious or less concerned around the humans in response

Def: Not learned behavior but rather, something that happens during a critical period in that organisms lifetime

Def: The ability to associate one environmental feature with another

EX in book: A blue jay that vomited a butterfly has probably learned to not eat anything of that butterfly's species

Estuaries

Physical characteristics:

Chemical characteristics:

Intertidal Zones

Physical characteristics

Chemical characteristics

Ocean Pelagic Zones

Physical characteristics

Chemical characteristics:

Coral Reefs

Physical characteristics

Chemical characteristics

Corals require high O2 levels & are excluded by high inputs of fresh water & nutrients

Formed largely from the calcium carbonate skeletons of corals

Shallow reef building corals live in the photic zone of relatively stable tropical marine environments w/ high water clarity

A vast realm of open blue water mixed w/ wind & oceanic currents**

B/c of higher water clarity, the photic zone extends to greater depths than in coastal marines

Nutrient concentrations are generally lower than in coastal waters

O2 levels are generally high

Turnover between fall & spring renews nutrients in the photic zones of temperate & high-lattitude ocean areas

Periodically submerged & exposed to the tides, twice daily on most marine shores

Upper zones experience longer exposures to air

Nutrient & O2 levels are usually high & are renewed w/ each turn of the tides

The substrates of intertidal zones are either rocky or sandy generally & select for particular behavior & anatomy among intertidal organisms

A transition area between river and sea

Higher-density seawater occupies the bottom of the channel & mixes w/ the lower-density river water

Sea water flows up the estuary channel during a rising tide & flows back down during the falling tide

Salinity varies within estuaries (fresh water/sea water) Salinity also varies w/ rise & fall of the tides.

Nutrients from the river make estuaries one of the most productive biomes

Marine Benthic Zones

Physical characteristics

Chemical characteristics

O2 is usually present at sufficient concentrations to support diverse marine life except in areas of organic enrichment

Consists of the sea floor below the surface of the waters

The marine benthic zone receives no sunlight

Water temperature declines w/ depth, while pressure increases

Organisms in the deep benthic zone are adapted to cold temperatures

Biomes according to latitude, elevation, & precipitation

SEA LEVEL / EQUATOR

ELEVATION / LATITUDE

Tropical

MOUNTAIN TOPS / POLES

Sub-polar

Temperate

Tundra

Tropical rain forest

Grasslands

Temperate deciduous forest

Savanna

Chaparral

Desert

Precipitation: In between wet & dry

Precipitation: Mainly dry summers

Precipitation: Dry

Precipitation: More wet

Precipitation: In between dry and wet. Dry winter & wet summers

Desert

Precipitation: Dry

Temperate deciduous forest

Coniferous forest

Precipitation: More wet

Precipitation: In between dry & wet

Sub polar desert

Precipitation: Dry

Frozen biome

Precipitation: In between dry & wet

Precipitation: Very wet

EX: A chimpanzee uses what he knows about water to reach food that is deep inside a tube

EX of behavior: A hognose snake spits at anything that threatens it in order intimidate the predictor being that the snake does not have poison

Part of behavior: If this snake is messed w/ too much, he'll through his head back, roll over, & starts to smell like it died. This behavior occurs the minute they hatch out of the egg

Ex found in a video

EX: Some moths will fold their wings when they detect ultrasonic sounds from predictors such as bats

Part of behavior: The moths fold up, fall to the ground & hide in response to the sounds. Stimulus -> ultrasonic sound. Fixed action pattern -
They fold, drop, & hide until the bat leaves

Ex in a video: If something were to pull an egg from a greylack goose that was sitting on it, the goose will pull the egg back in to finish incubating it.

Part of behavior: If you were also took something like a golf ball & set it next to the nest, the goose would also pull that in to be "incubated"

Book EX: EX: An animal thinking something else is it's mother

Behavior from a video: Konrad Lorenz took the mother goose out & took her place during the critical moment of the young geese & consequently, the young geese followed him, thinking he was the mom

Classic EX: Pavlov rang a bell & then gave dogs some meat powder for a series of times, therefore, those dogs began to associate the ringing of the bell with food & they would salivate every time the bell rung

Classic EX: Skinner tough a rat how to perform complex behaviors through this method. After Skinner took the rat through a series of learning he left the rat alone & when the green light came on in the cage, the rat touched the lever to make the food come out

Def: Combining what you know to solve a problem

Behavior from a video: A prairie dog that lives in an environment w/ a lot of exposure to humans, the prairie dog will eventually get used to seeing humans & he will stop screaming every time he sees one like he did previously. The prairie dogs habituate to that

Behavior from a video: A monkey learns how to drink from a bottle by observing a human do it

Behavior from a video: A chimpanzee solves his problem of getting a banana by using what he knows to get to the food

Stimulus for behavior: The red color on the other fake fish

Observed behavior: The stickleback fish merely attacks the red halved colored fake fish until the red fish is removed

Type of behavior Fixed action pattern

Purpose or effect of behavior: Defense mechanism

EX from video provided

Stimulus for behavior: Need to reproduce

Type of behavior Innate

Observed behavior: A jeweled wasps stings a cock-roach in the head in which the wasps uses it's venom to slightly paralyze the roach. Then the wasp brings the roach it's cave and barricades him in there after the wasp lays it's eggs inside the roach. As the baby wasp hatch, they slowly kill the roach

Purpose or effect of behavior: The cock-roach provides a safe place for the eggs to be laid & later hatched

EX from video provided

Stimulus for behavior

Type of behavior

Observed behavior

Purpose or effect of behavior

Octopus # 2 observed octopus #1 who already knew how to open the jar get to the food. Once octopus # 2 received the jar from Dr. Graziano Fiorito, octopus # 2 got to the crab immediately b/c he knew how to do it by observation

Seeing another octopus open the jar

Observational learning

To get to the food

click to edit

Stimulus for behavior

Type of behavior

Observed behavior

Purpose or effect of behavior

A crow is given an 8 stage maze to get through to get to it's food. The crow tries the small stick first to get into the cage containing the food, that didn't work so he tried using the rock which worked & eventually the crow got to the food

Food

Trial & error

To obtain food

Ex from video provided

EX from video provided

Stimulus for behavior:

EX from video provided

Purpose or effect of behavior:

Observed behavior:

Type of behavior

Ducklings began to follow the cat around thinking that the cat was the duckling's mother

The ducklings needing a mother like organism to follow

Imprinting

The mother duck not being around for the critical period of the ducklings whereas the cat was

Logistic growth

Exponential growth

EX from a video

A man brought 24 rabbits to Australia so that he could hunt them. The rabbits had no natural predictors & the pop. grew at an alarming rate b/c the generations were building

Definitions

A population's per capita growth rate stays the same regardless of population size, making the population grow faster as it gets larger

When a population increases due to there being an abundant amount of resources & organisms reproducing freely

When growth becomes more rapid in relation to the growing total number

Definitions

A population's per capita rate gets smaller as population size approaches a maximum due to limiting resources in the environment (K)

The per capita rate of increase approaches zero as the population size nears the carrying capacity

Factors that affect population growth

Density independent

Density dependent

Def: A birth rate or death rate does NOT with population density

The 6 major density dependent factors that affect population growth

EX from class: A natural disaster could wipe out a bunch of people b/c they happen to be there at the wrong time

The rate of growth increases as the population increases

Exponential growth is Not linear b/c

More people are reproducing

EX: The paramecium are grown in a constant environment lacking predators & competing species that may reduce growth of populations

EX: With the Daphnias, the population dropped below carrying capacity which made a delay in the population growth until the increased number of offspring were born,

Competition for resources

Disease

Predation

Examples

Farmers minimizing the competition on the growth of crops by utilizing fertilizers

Competition for jobs in humans

Examples

People who live in large populated cities are at higher risk for the flu or tuberculosis when an infected person coughs

Examples

Competition for food in organisms

The more packed in, the faster the spread

A predator that captures more food as the population density of the prey increases

Population increases in the lemmings & other small rodents which lead to density dependent predation by predators including the snowy owl

Intrinsic factors

Example

Territoriality

Examples

Toxic Wastes

Example

Space becomes the resource in that is competed for

Cheetahs use a chemical marker in urine to warn other cheetahs of their territorial boundaries

Reproductive rates of white footed mice in a field enclosure can drop. This drop in reproduction at high pop. density is associated w/ aggressive interactions & hormonal changed

Alcohol content in wine is usually less than 13% b/c that is the maximum concentration of ethanol that most wine- producing yeast cells can tolerate

EX from book A stress drought could cause a population to die due to lack of water or food

EX from book: A population of elephants in Kruger National Park grew exponentially for ~ 60 years after they were protected. The large number of elephants caused damage to vegetation so the park managers gave the elephants birth control & sent some to other countries

They over went over carrying capacity b/c they were reproducing before they were able to stabilize

Difference between climate & weather

Human population & growth

Beginning of human pop. increase: After the Industrial Revolution & after the founding of antibiotics

Human population growth

The human pop. is not going exponentially yet it is still steadily increasing

Ecological footprint

Def: The amount of land & water required by each person, city, or nation to produce all the resources it consumes to absorb all the waste it generates

Ecological footprints in different countries

Developed country: 24 acres

Underdeveloped: 2.4 acres

Land divided equally.: 2.4 acres per capita

Countries with the highest population rate

The U.S.

India

China

Climate

Weather

Def: Weather prevailing over a long period

Def: Weather prevailing over a short period

The 4 physical climate factors that affect earth

Temperature

Precipitation

Sunlight

Wind

Earth's tilt

23.5 degrees

Northern hemisphere is most tilted towards sun: June 21st (Summer Solstice)

Northern hemisphere is most tilted away from sun: Dec 21th (Winter Solstice)

How large bodies of water & mountains affect climate change

1) Air mass is filled w/ water vapor

2) As that mass hits the Rockies, air mass is forced up. It cools, then rains

3) There is less moisture is left in the air on the leeward side. This rain shadow can create a desert on the back side of the mountain range

Stimulus for behavior

Type of behavior

Observed behavior

Purpose of effect of behavior

Dogs salivating

Meat powder

Associative

Obtain food

Stimulus for behavior

Type of behavior

Purpose or effect of behavior

Observed behavior

To warn the other prairie dogs

Habituation

Multiple exposures to humans

Prairie dogs stop screaming after exposure to humans

Stimulus for behavior

Type of behavior

Observed behavior

Purpose or effect of behavior

A chimp gets the banana

Hunger

Insight

Obtain food