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| What was the conclusion drawn from Simberloff and Wilson's experiment? |
Predictions of speed and recovery and # of species are accurate but species composition was different and turnover was low |
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ejatkins Thu, 09 Feb 2012 00:48:39 GMT |
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| What were the results of Simberloff and Wilson's experiment? |
-there was equil. w/in a year
-farthest island from mainland had fewest species
-equil. #'s similar b/w pre and post fumigations but species composition was different |
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ejatkins Thu, 09 Feb 2012 00:48:39 GMT |
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| What was Wilson and Simberloff's Island Biogeography experiment? |
On mangrove island (FL) fumigation of 6 islands, killed arthropods. |
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ejatkins Thu, 09 Feb 2012 00:48:39 GMT |
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| What were the conclusions of Paine's experiment? |
1. mussels were competitive dominant (exclude others from space)
2. predator mediated coexistence |
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ejatkins Thu, 09 Feb 2012 00:43:53 GMT |
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| What was Paine's experiment? |
he removed starfish and excluded them for 5 years.
Year 3: control had 28 species
treatment had 2 species (mussels/barnacles)
Year 5: control had 28 species
treatment had 1 species (mussels) |
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ejatkins Thu, 09 Feb 2012 00:43:53 GMT |
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| Why conserve biodiversity? |
1. economic value
2. ecosystem services
3. environmental ethics |
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ejatkins Wed, 08 Feb 2012 00:27:53 GMT |
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| Ecosystem diversity |
diversity of structure and function in an ecosystem |
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ejatkins Wed, 08 Feb 2012 00:27:52 GMT |
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| Species diversity |
number and relative abundance of species |
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ejatkins Wed, 08 Feb 2012 00:27:52 GMT |
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| Genetic diversity |
amount of genetic variation among species |
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ejatkins Wed, 08 Feb 2012 00:26:01 GMT |
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| What are the 3 levels of biological diversity? |
1. genetic diversity
2. species diversity
3. ecosystem diversity |
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ejatkins Wed, 08 Feb 2012 00:26:01 GMT |
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| What is the non-equilibrium view of community structure? |
1. communities composition is always changing and never in balance
2. no global stability
3. communities are patch works of disturbance. Colonization and dispersal determine species diversity |
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ejatkins Thu, 09 Feb 2012 07:34:12 GMT |
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| What is the equilibrium view of community structure? |
1. communities structured by biotic interactions
2. communities display global stability
3. niche diversification determines species diversity |
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ejatkins Wed, 08 Feb 2012 00:26:01 GMT |
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| Equil. Model of Island Biogeography predictions |
1. small islands farthest away have fewest species
2. large islands near mainland have most species
3. turnover of species is high and the number of species on an island remains relatively constant |
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ejatkins Thu, 09 Feb 2012 07:31:17 GMT |
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| If extinction < immigration then |
species diversity low |
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ejatkins Wed, 08 Feb 2012 00:26:01 GMT |
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| If extinction > immigration then |
species diversity high |
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ejatkins Wed, 08 Feb 2012 00:26:01 GMT |
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| What does the equil. model of island biogeog. explain? |
the process of succession on new islands and suggests # of species |
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ejatkins Wed, 08 Feb 2012 00:26:01 GMT |
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| Who came up with the Equilibrium Model of Island Biogeography? |
MacArthur and Wilson |
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ejatkins Wed, 08 Feb 2012 00:16:34 GMT |
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| What determines species diversity on an island? |
1. rate of immigration
2. rate of extinction
3. island size
4. distance from mainland |
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ejatkins Thu, 09 Feb 2012 07:34:50 GMT |
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| How is species richness correlated with island distance from mainland? |
negatively (-) |
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ejatkins Wed, 08 Feb 2012 00:16:34 GMT |
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| How is species richness correlated with island size? |
positively (+) |
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ejatkins Wed, 08 Feb 2012 00:16:34 GMT |
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| How can predation increase diversity? |
by preventing competitive exclusion |
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ejatkins Wed, 08 Feb 2012 00:00:12 GMT |
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| Keystone species |
strong influence on the community is greater than expected based on low abundance |
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ejatkins Wed, 08 Feb 2012 00:00:12 GMT |
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Character displacement
(Darwin's Finches) |
alterations of beak size and shape leads to coexistence |
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ejatkins Wed, 08 Feb 2012 00:00:12 GMT |
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Resource partitioning
(Darwin's Finches) |
all eat same food types but specialization on different food sizes |
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ejatkins Wed, 08 Feb 2012 00:00:12 GMT |
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| Long term scales (evolutionary) |
interspecific competition INCREASES diversity |
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ejatkins Tue, 07 Feb 2012 23:43:51 GMT |
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| Short term scales (ecological) |
interspecific competition DECREASES diversity |
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ejatkins Tue, 07 Feb 2012 23:43:51 GMT |
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| The NARROWER the average niche breadth |
The MORE species in the community
(coexistence via resource partitioning) |
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ejatkins Tue, 07 Feb 2012 23:43:51 GMT |
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| The WIDER the average niche breadth |
the FEWER the number of species in the community
(competitive exclusion) |
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ejatkins Tue, 07 Feb 2012 23:43:51 GMT |
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