Bio 200 Final Exam Review Flashcards
Ecology
The study of distribution and abundance of organisms
How is ecology related to evolution?
Ecology causes evolution
Abiotic
Non-living
Biotic
Living
Three factors that influence the climate
1.) Variation in light intensity
2.) The angle/tilt of earth
3.) Variation in local conditions
The angle/tilt of earth
Gives us seasons
Lake effect snow
As air cools down faster than lake water, it picks the water vapor up then freezes it and drops snow (once lake is frozen no more LE snow)
Adiabatic cooling
Caused by increasing elevation (reducing temp through a change in air pressure) (higher you go, colder it gets)
Windward side of Mtn
Air rises, cools, releases moisture leads to lush vegetation
Leeward side of Mtn
Air descends, warms, picks up moisture, makes it more desert like
Less predictable global effects on climate
- El Nino
- PDO
El Nino
Warming of ocean’s surface to above average temps
La Nina
Cooling of ocean’s surface to below average temps
Hadley Cell
Circulations that have air rising at the equator and air sinking at roughly 30° latitude
Biomes
Defined by temperature and rainfall
Hot desert
- Less precipitation
Cold desert
- Vegetation limited
- No permafrost
- More precipitation than tundra
Niche
The entire range of resources a species needs to survive
Joseph Connell
Barnacles (temporal partitioning)
Robert MacAurthur
Warblers (niche partitioning)
Species interactions
- Competition
- Predation
-Symbiosis
Competition
When two or more similar organisms need same limited resource (-/-)
Predation
When one species consumes another (+/-)
Symbioses
A long-term interaction of 2 species
Parasitism (+/-)
Mutualism (+/+)
Commensalism (+,0)
Ammensalism (-,0)
Why is competition hard to see?
It often happened in the past
The ghost of competition past
If competition happened in the past, you can study the relationships today
How to study competition
- Experiments (1917 Sir Arthur George Tansley galium experiment)
- Comparison of Allopatric and sympatric populations
Exploitation competition
One species lowers the resources of another
Interference Competition
One species prevents the other from gaining access to a resource
Interspecific
Different species
Intraspecific
Within the same species
Sympatric
Species living in close proximity
Allopatric
Species live apart
Temporal partitioning
Organisms born at different times of year will not be in competition
Intraspecific competition can lead to…
less interspecific competition
True predators
Kill immediately, usually consume all of prey
Parasitism
Do not (immediately) kill prey
Examples: Giardia, mistletoe
Herbivores
Predatory: whole plant consumed
Parasitic: Part of plant consumed
Detrivores
Eating things already dead/non-living (does not impact population sizes)
Predators lower prey…
abundance
Prey can restrict predator distribution
Where prediators limit the range of prey species
Example: megapode
Predator/prey cycling
showshoe hare and lynx (more lynx, less hares, next year less lynx, next year more hares, etc.)
Methods of predator and prey coexistance
- Refuges
-Cycling
-Predators at low abundance
-Generalist predators
Prey defenses
-Crypsis
-Chemical defense
-Armor
-Behavioral defense
-Predator satiation
Crypsis
Cryptic coloration: camoflauge
Object mimicry: mimics something not edible
Chemical defense
-Toxicity: most synthesize their own poison, nudibranchs steal poison from other organisms
-Aposematic coloring: bright colors to indicate poison
-Batsian mimicry: bright colors, no poison
-Mullerian mimicry: bright colors, poison, also looks like another poison species
example: viceroy and monarch
Armor
shells, spikes, etc.
example: armadillos, porcupines clams
Behavioral defense
- Alarm calling
- Distraction displays
- Running
- Herds
Predator satiation
Timing reproduction so all young are produced in short period of time (higher % of survival)
Types of hunting
- Ambush
- Stalking
- Pursuit
Coevolution
When a species evolves due to interactions with another species