Ecological Relationships
Barnacles living on wales is an example of this relationship
What is commensalism (type of symbiosis)?
Autotrophs
What are producers / organisms in 1st trophic level?
Method used to estimate a population size
What is the mark-recapture method?
This type of population growth occurs when growth rate decreases as population size increases
What is logistic growth?
Two factors present in every ecosystem that affect organisms
What are biotic and abiotic factors?
Bees and flowers are an example of this relationship
What is mutualism (type of symbiosis)?
Organisms that eat herbivores
What are secondary consumers / carnivores / organisms in the third trophic level?
Number of individuals living in a defined area at a given time
What is population density?
This type of population growth occurs when growth rate stays constant as population size increases
What is exponential growth?
In a food web, arrows point away from these
What are organisms that are eaten?
Fleas living on dogs is an example of this relationship
What is parasitism (type of symbiosis)?
Organisms that eat producers
What are primary consumers / herbivores / organisms in the second trophic level?
How individuals are spread out in an area
What is population dispersal?
Maximum number of organisms that can be supported in a given environment
What is carrying capacity?
These organisms recycle nutrients back into the environment
What are decomposers?
Snakes and mice are an example of this relationship
What is predation?
Organisms that eat carnivores
What are tertiary consumers / carnivores / organisms in the fourth trophic level?
Population dispersal pattern with no set pattern indicating that members of the population have low social interaction (neither positive or negative)
What is random population dispersal?
Something that helps determine how large a population can grow
What is a limiting factor?
This increases an ecosystem's stability and resilience
What is high biodiversity?
When this relationship occurs, the populations of 2 species fluctuates over time
What is predation?
Don'f fit well into any specific trophic level
What are decomposers?
Population dispersal pattern when individuals are evenly spaced in order to decrease competition for resources and territory
What is uniform population dispersal?
A prediction for the number of rabbits after 1 year if the initial population size was 345 and the growth rate was 0.67 per year
345 x 0.67 = 231.15
231.15 + 345 = 576.15
~580 rabbits
This occurs to the total usable energy in the ecosystem as it transfers between trophic levels
What is a decrease in usable energy? (90% of energy lost as heat)