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27 Cards in this Set

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  • Back
What is it called when there are fewer species but those fewer species can expand to more habitats?
Habitat expansion
_____ is when you look at the diversity within a homogenous habitat patch.
alpha diversity
_______ is when you look @ diversity across a whole region.
gamma diversity
_______ is when you look @ the diversity between one patch and another in a certain region.
beta diversity
____ describes how when there are more species then there are a fewer number per species.
density compensation
_____ is like a combo of of habitat expansion and density compensation.
ecological release
_______ states that when there are fewer species then they are released from competition.
ecological release
Why would larger islands have more species? 3 main reasons
1. more resources= more nitches: species are less likely to go extincy.

2. species are more likely to find big island (passive sampling hypothesis)

3. On large island a disturbais less likely to kill off species. (disturbance hypothesis)
What are the two arguments in thoery of island biogeography for why the number of species on island are in a dynamic equilib?
1. not all species are equally good disperses.

2. lots species = greater extinction rate
what type of system is ecosystem is respect to energy?
open system
In an ecosystem what is the biomass produced by plants/ autotrophs called?
Gross primary production (GPP)
What is photosynthesis minus respiration that leads to the growth of plants called?
Net primary production (NPP)
what level of disturbance leads to the greatest number of species?
what 2 things influence NPP in NPP in an water environment?
amount light and nitrate level.
____________ is the proportion of biomass in 1 trophic level consumed by individ in next highest trophic level.
exploitation effeciency
______ = the proportion of ingested that = production
gross production effeciency
_______ ______ is the proportion of production @ one trophic level that results at production in next higher trophic level.
ecological effeciency
what do microrhyzal fungus do for plants?
They increase plants root surface area so more nutrients can be uptaken.
What forms of N can plants use?
Nitrate, nitrite, and ammonia
____ is the area in lake where all productivity occurs?
photic zone
what is the limiting nutrient in a freshwater environment?
what is it called when lower trophic levels influence top layers.
bottom up control
_____ is a group of sub populations that are connected by migration.
what is the formula for the change in population rate/ change in time?
what is net ecosystem production.
net primary production NPP- soil respiration.
what is assimilation effecency
the % of energy, consumed by a trophic level, that is assimilated.
what is net production effeciency
the % of assimilated energy that leads to production.