Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
Test #3
Control of Species Diversity
| Question | Answer |
|---|---|
| Two components of species diversity | Species richness and species eveness |
| Species richness | # of species in a community |
| Combine both. You create... | Diversity |
| Which community is more diverse? | Look at Notes |
| Even though the species richness is the same Community 2 is more diverse b/c... | Greater eveness |
| Practical impact of low VS. high diversity: What happens in low diversity? | Predators can find new host easily--can lead to the decline in host |
| Example of low diversity | Elms in northern towns and cities and Ash trees |
| Story of the ash trees | Several years ago--proposal to plant 3 lines of green ash along University Ave to Asher Ave |
| Why was planting one species, aligned together a bad idea? | If one was affected by a killing organism, than the other where prone to the organism as well and would die. |
| What invasive species introduced to kill ash trees | Emerald Ash Borer |
| Would the monoculture of ashes make ecological sense? | NO |
| What factors control species diversity? | Ecological and Environmental Factors |
| Ecological factors | Disturbance / Predation / Primary Productivity |
| Environmental factors | Extinction rates / Speciation rates |
| Connell's intermediate disturbance hypothesis | Experiment boulders in rocky intertidal / difference in intensity |
| Disturbance | Event that removes organisms from an area-- may restart succession |
| Examples of disturbance that may restart succession | Fires, floods, storms |
| Keystone species (predators) | A species who's presence changes the community composition |
| Look at Disturbance of intensity and frequency chart on notes | --- |
| Low # of species and low disturbance intensity | Competition is limiting the # of species (NO disturbance) |
| Neutral # of species and disturbance intensity | HIGH # of species; intermediate |
| Low # of species and HIGH disturbance intensity | Very few # of species due to the severity of disturbance |
| Example of a Keystone species | Starfish |
| If Starfish are present in a community... | More space will be available to other species meaning less competition |
| If Starfish are absent in a community... | Other species want have enough space to settle |
| Define Intertidal | Interaction between low tide and high tide |
| Conclusion: How does Starfish have an affect the community? | The starfish eats the organisms off the rocks allowing other species to inhabit those areas now open. If they are absent, then there will not be an space avsilable |
| Other examples of Keystone species | Sea otters / Sea Urchin / Giant Kelp |
| Cycle of the Keystones species in the previous ? | Sea otters (eat) > Sea urchin (eat) > Giant Kelp (eat) |
| Small rocks will have... | Higher disturbance than big rocks b/c they flip over easily |
| Look at notes at the end | --- |
Created by:
animalsavior
Popular Biology sets