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