For related species that compete strongly, natural selection should favor differences in habitat use
Back
What is an example of an interaction among resources?
Front
Small Assam plans fighting for fertilizer, light, or both
Back
What is intraspecific competition?
Front
Among individuals of the same species. Negative density dependence
Back
What are the Lotka-Volterra Competition equations?
Front
N=aN or N=bN (alpha and beta again)
Back
What is Leibig's Law of the minimum?
Front
Population growth is limited by the resource that is most scarce relative to the demand
Back
What are two examples of non-related species competition
Front
Krill: eaten by many things
Intertidal Zones: Lots of different things use these
Back
What are renewable resources?
Front
Resources that are constantly regenerated
Seeds
Back
What is the competitive exclusion principle?
Front
Two species cannot coexist indefinitely when they are both limited by the same resource
Back
What does beta mean in the competition for a single resource?
Front
Converts individuals of species 1 into the equivalent number of individuals of species 2
Back
What is an example of resource use?
Front
Open space on rocks can affect growth and fecundity of different marine species
Back
What are we adding?
Front
1. The number of individuals of the second species
2. How much each individual of the second species affects the carrying capacity of the first species (competition coefficient)
Back
What is competition of non-related species
Front
Competition can also be intense among distantly related species that needs a common resource
Back
What are examples of abiotic conditions?
Front
Barnacles competition with light and oxygen
Back
What is an external source?
Front
Consumers reduce availability but not supply
Dead leaves fall into streams from the surrounding forest
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What is interspecific competition?
Front
Among individuals of different species
Back
What does alpha mean in the competition for a single resource?
Front
Converts individuals of species 2 into the equivalent number of individuals of species 1
Anything an organism consumes or uses. Can cause an increase in population growth rate when it becomes more available
Back
What is an example of leibig's law of minimum
Front
Silica with different carrying capacities
Back
What is an internal source?
Front
Originated within the ecosystem. Competitors can affect the supply and demand for the resource.
Back
What are abiotic conditions?
Front
The ability to compete well may be overwhelmed by the ability to persist in harsh conditions
Back
What is competition for multiple resources?
Front
Two species may be able to coexists when each is better at persisting at low levels of different resources
Back
What is competition for a single resource and the equation for it?
Front
Population dynamics of two competing species can be modeled by using the logistic growth equation.
Dn/dot = rn(1-n/k)
Back
What is competition?
Front
Negatve interaction between individuals from the same or different species occuring when they require the same limited resource
Back
What is an example of competitive exclusion principle?
Front
Two species of paramicium wit a limited amount of bacteria as a resource
Back
What are the variables of the competition coefficient? Alpha: Beta
Front
Alpha: Competition coefficient for species one
Beta; Competition coefficient for species two
Back
What does an interaction among resources mean?
Front
An increase in one resource can have Mach larger effect on a population when there is also an increase in a second resource
Back
Without competitors, a species tends to use its:
Front
Fundamental niche
Back
When two species compete for a single limiting resource, what occurs?
Front
The species that persists is the one that can drive down the abundance of that resource to the lowest level
Back
What is an example of related species competition?
Front
Plants and soil type
Back
What are examples of competition for multiple resources?
Front
Cyclotella and Astrionella
Back
What is an Isocline?
Front
A line for each species where population is stable. Experiences zero growth
Back
What are the variables. Importance in the competition coefficient
Front
They convert between the number of individuals of one species and the number of individuals of the other species
Back
What is the importance of predation and herbivore?
Front
There are trade-offs between competitive ability and resistance to predatory or herbivores. The most competitive organisms are often the most susceptible to predation
Back
When niches are very similar, competition is (weak/strong) which means what?