Chapters 51, 52, and 53.
Environment
Ecology
Ecology is the study of organisms and their environment.
6 major fields within the study of ecology
Community - Community ecology examines how species interactions, such as predation and competition, affect community structure and organization
Ecosystem - Ecosystem ecology emphasizes energy flow and chemical cycling between organisms and the environment.
Population - Population ecology analyzes factors that affect population size and how and why it changes through time.
Landscape - Research in landscape ecology focuses on the factors controlling exchanges of energy, materials, and organisms across multiple ecosystems
Organismal - how an organism’s structure, physiology, and behavior meet the challenges posed by its environment
Global - Global ecology examines how the regional exchange of energy and materials influences the functioning and distribution of organisms across the biosphere
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Poles
why are the poles cold? there is less sunlight in the North.
why do experience seasons? seasons are due to the tilt of the axis.
Where on the planet is there no seasons? the equator or tropics is hot all the time.
tilt and hemispheres
Tilt of the earth - 23.5 degrees
Earths curved shape causes latitudinal variation in the intensity of sunlight. Because sunlight strikes the tropics (regions that lie between 23.5 north latitude and 23.5 south latitude) most directly, more heat and light per unit of surface area are delivered there.
At higher latitudes, sunlight strikes Earth at an oblique angle, and thus the light energy is more difuse on Earths surface,
The northern hemisphere is most titled towards the sun in summer, June 21st.
The northern hemisphere is most tilted away from the sun in winter, December 21st.
The tilt of the Earth is most perpendicular to the sun - equinox, Marcg 20th and September 22nd
Latitude and Longitude
Latitude - Horizontal
Longitude - connects poles
At latitudes 0 and 60 air rises releasing moisture causing low pressure
At latitude 30 air sinks, dry air absorbs moisture causing high pressure
most rain forest are located near equator
most deserts are located just above the equator
climate and weather
climate is related to general characteristics
weather is whats currently happening
4 major physical factors that affect climate - 1. Temperature 2. sunlight 3. precipitation 4. wind
regional factors that can affect climate - major bodies of water that regulate temperature, seasonal changes, mountains that block wind, current water + air.
wind
what creates wind? air going up and down due to latitude. and the spin of the earth.
Trade winds - flow west near the equator
westerlies - blow east due to corrieola effects.
Doldrums - area that gets no wind due to forces cancelling out
earth rotation, rain shadow, mountains.
looking down from above the north pole, earth is turning counter clockwise
air and water currents turn CLOCKWISE in the northern hemisphere
air and water currents turn COUNTERCLOCKWISE in the southern hemisphere.
Rain Shadow - effect caused by mountains
mountains in the western side of the US are more rain forest because dry air goes down and picks up moist.
mountains on one side can have forest and the other side only grass due to one side gets rain and the other is dry
carbon cycle
the series of processes by which carbon compounds are interconverted in the environment, involving the incorporation of carbon dioxide into living tissue by photosynthesis and its return to the atmosphere through respiration, the decay of dead organisms, and the burning of fossil fuels.
climate change - The burning of fossil fuels and deforestation are increasing the concentrations of carbon dioxide and other greenhouse gases in the atmosphere. As a result, Earth has warmed an average of 0.8°C (1.4°F) since 1900 and is projected to warm 1–6°C (2–11°F) more by the year 2100.
biotic and abiotic
biotic - life
abiotic - temperature and nonliving
microclimate - typical environment in a small area
biome - climate and community
Ectotone - overlap of environments
why biomes change over time - patterns, blending of environments, temperature change, environmental changes.
Major abiotic and biotic factors
1 How do they spread - trees travel far
- tolerance of environments - many organisms cannot live there
- food supply
- predators
competition
- ability to adapt
- diseases parasites
Terrestrial Biomes
Tropical Forest - located near equator or sub equator. can be wet or dry. usually hot. dominant plants are trees. dominant animals are mammals and can vary.
Desert - located 30 degrees latitude north and south and equator to poles. usually dry no rain. temperature can vary. dominant plants are cacti. dominant animals such as snakes scorpions and arthropods.
Savanna - located near equator and sub equator. rain averages 30 to 50 cm per year. dry 8 to 9 months. warm and seasonal. dominant plants fire adapted. forbs. small leaves. grass. dominant animals are zebra, lion , hyenas, grazing animals.
Chaparral - located mid latitude near coast. wet and dry seasons. hot summer cool winter seasonal. dominant plants are shrubs. dominant animals are deer rabbits birds.
Temperate Grassland - located 30 to 70 latitude. usually summer is wet. variation in climate. dominant plants grasses forbs and flowers. dominant animals herbivores bison and gazing animals.
Northern Coniferous Forest - located northern USA and Canada. not so wet can vary. temperature is cold. dominant trees are pine trees and conifores. Dominant animals are moose bears and birds
Temperate broad leaf forest - mid latitude. usually wet but can vary. temperature is temperate. dominant plants are deciduous trees. dominant animals are mammals birds and insects.
Tundra - located in polar mountain tops. dry and wet. temperature is cold. dominant plants are shrubs mosses small plants. dominant animals bears wolves and foxes.
Aquatic biome
lakes - standing bodies of water, light decreases causing stratification.. Oligotrophic lakes are nutrient poor and generally oxygen-rich; eutrophic lakes are nutrient-rich and often depleted of oxygen in the deepest zone in summer and if covered with ice in winter. They tend to have less surface area relative to their depth than eutrophic lakes.
dominant autotrophs - rooted and floating aquatic plants, phytoplankton, cyanobacteria.
dominat heterotrophs - zooplankton, fish
Wetlands -habitat that is inundated by water. both the water and the soils are periodically
low in dissolved oxygen. Wetlands have a high capacity to filter dissolved nutrients and chemical pollutants.
Basin wetlands, Riverine wetlands, fringe wetlands
Photosynthetic organisms pond lilies, cattails, sedges, bald cypress, mosses, black spruce.
Heterotrophs - invertebrates, birds, crustaceans and aquatic insect larvae muskrats, consume algae, detritus. dragonflies, otters, frogs, aligators. .
Streams and rivers - headwater streams are cold, clear, turbulent adn swift. downstream from rivers and is warmer.
The salt and nutrient content of streams and rivers increases from the headwaters to the mouth. Headwaters are generally rich in oxygen.
headwaters are often narrow, rocky shallow. downstreams are wide and meandering.
Photosynthetic organism phytoplanktn and rooted aquatic plants.
Heteroptrophs fishes and invertabrates
Estuaries - estuary is a transition area between river and sea. Salinity varies spatially within estuaries, from nearly that of fresh water to that of seawater. tidal channels, islands, natural levees, and mudflats.
Photosynthetic organisms Saltmarsh grasses and algae, including phytoplankton, are the major producers in estuaries.
heterotrophs worms, oysters, crabs, many fish and invertebrates.
Inter-tidal zones - intertidal zone is periodically submerged and exposed by the tides, twice daily on most marine shores.
Oxygen and nutrient levels are generally high and are renewed with each turn of the tides
The substrates of intertidal zones, which are generally either rocky or sandy
Photosynthetic organisms - marine algae seagass and algae
Heterotrophs sponges sea anemones echinoderms small fishes
Oceanic Pelagic Zone - oceanic pelagic zone is a vast realm of open blue water, constantly mixed by wind driven oceanic currents.
Oxygen levels are generally high. Nutrient concentrations are generally lower than in coastal waters.
This biome covers approximately 70% of Earth’s surface and has an average depth of nearly 4,000 m.
Photosynthetic Organisms phytoplankton, bacteria
Heterotrophs zooplankton, worms, corepods, portists, shrimp, sea turtles marine mammals
Coral Reefs - Coral reefs are formed largely from the calcium carbonate skeletons of corals
Corals require high oxygen levels and are excluded by high inputs of fresh water and nutrients
. A typical coral reef begins as a fringing reef on a young, high island, forming an offshore barrier reef later in the history of the island and becoming a coral atoll as the older island submerges
Photosynthetic organisms - algae, red and green algae
Heterotrophs - cnidarians fish and invertabrates
Marine Benthic Zone - marine benthic zone consists of the seafloor below the surface waters of the coastal, or neritic, zone and the offshore, pelagic zone
Except in areas of organic enrichment, oxygen is usually
present at sufficient concentrations to support diverse animal life.
rocky substrate on reefs, submarine mountains, and new oceanic crust
Autotrophs seaweeds, filamentous algae
Heterotrophs - invertabrates, arthropods echinoderms, fishes
Animal Behavior
types of animal behaviors
Innate
genetically programmed. day 1 actions. born with. Ex. instincts. Baby grasping. snake playing dead
Fixed action pattern
Behavior triggered by something for purpose. stimulated. ex. recognizing people, an egg next to a nest
Imprinting
the establishment of a long-lasting behavioral response to a particular individual or object. Imprinting can take place only during a specific time period in development, called the sensitive period. ex. ducks following mother
Associative learning
Making connections with things. associating. The ability to associate one environmental feature (such as a color) with another (such as a foul taste). ex. Pavlov training dog
Trial and Error
Figuring things out by trying different things. ex. trial and error, after some try youll figure it out.
Habituation
same stimuli over and over again, ignoring it. Ex. living by a train. overtime response changes.
Observational learning
Watching and mimicking. ex. squid watches other squid open bottle then copies the same action. Mirror neuron
insight
figuring out problems ex. solving issues in a manner of time.
4 major motivations for animal behavior
Food, Mating, avoid being prey, Mimic, and survival
2 ways behaviors evolve
Survival of organism ex. how to hide, avoid danger
Help to be more fit Ex. imprinting, teaching
Population ecology
species, population, community, ecosystem, and biome
Species - group of organism that can reproduce
Population - organisms in a geographical area
Community - all organisms in a boundary
Ecosystem - community and environmental factors
Biome - big, based on location on planet
Dispersion patterns
- Clumped (humans)
Random (wind)
- Uniform (bird, territorial)
3 survivor ship curves
Population size, growth rate, R>0, R<0,R=0
How to calculate population (Births +Immigration) -( deaths + emigration )
Growth rate = per unit of time (r)
r = R/N/total pop. per unit.
r>0=pop. goes up
r<0= pop. goes down
r=0 pop. is the same
r for humans right is = 1.1 or 1.2
Exponential growth
exponential growth is fast growth
growth is not linear due to more babies being born that add to the rate of change.
Exponential growth is followed by a crash
population show exponential growth due to a lot of resources.
Exponential, logistic, carrying capacity
Logistic levels out population
carrying capacity - maximum resources available for a population
semelparous and iteroparous, r-selected, k-selected
semelparous - reproduce once and you die
iteroparous - reproduce multiple times, humans
r - selected/strategist - exponential grower, reproduce more (frog)
K-selected/strategist - limit reproduction (humans)
6 major density dependent factors that affect population growth
- food 2. water 3. space 4. waste 5. habitat 6. disease competition and social
2 major density independent factors 1. natural disasters 2. hurricane droughts fires 3. loss of food supply
ecological footprint
this is a geographic representation of all resources a person uses
ecological foot print for developing country - 2.4 acres
ecological footprint for developed country 24 acres
land available if equally divided - 3.2 acres per person in developing country and 1.7 acres per person in a developed country
not enough resources to go around for everyone to be at a standard of living as the US.
3 countries with highest population, 3 with the highest growth rate
china india and US
Bahrain, niger oman