In this type of interdependence, both organisms are negatively affected; they are seeking the same resources.
What is competition.
100
This term describes the number of individuals that live per a specific unit of area.
What is density
100
Peacocks exhibit this type of mating, which can lead to changes in the population based upon the size of their glorious tails.
What is non-random mating
100
In this type of selection, the two extremes of a trait are selected for in a population. It could even lead to speciation!
What is disruptive selection
100
These types of organisms are the least energy efficient, and are found at the top of an energy pyramid.
What are predators.
200
Like a predator-prey relationship, this type of interdependence is considered +/-, although unlike predator-prey, the host is rarely killed.
What is parasitism
200
The net growth of a population can be determined in this way.
What is birth rate-death rate
200
Small, isolated populations are most likely to be effected by this process, which is the loss of many individuals and the survival of only a few.
What is genetic drift
200
This type of trait may be selected for or against in nature, but it is defined by being influenced by several different genes. Human skin color is an example.
What is a polygenic trait.
200
This is the dry weight of all the organic matter found in an ecosystem. It is an indicator of available energy.
What is biomass.
300
A lichen growing on a tree does not really effect the tree in any way, but the lichen is provided with a safe habitat. This type of interdependence is described by this relationship.
What is commensalism
300
This is the manner in which organisms within a population are arranged within their habitat. It is sometimes clumped, or maybe random.
What is dispersion or distribution
300
This happens constantly, and is a major source of variation in populations. It can have a positive or negative effect.
What is mutation
300
Giraffes exhibit this type of selection; long necks are best!
What is directional selection
300
Most energy taken up by an organism is not passed on to the next trophic level. It is typically lost as this.
What is heat.
400
Nemo and the anem...anemenem...anemone exhibit this type of interdependence, where both organisms are benefited.
What is mutualism
400
This exists for all populations, and indicates the number of individuals that can be supported by the environment.
What is the carrying capacity
400
This theory of population dynamics only truly applies to large populations whose members are unlikely to be affected by selective pressures.
What is Hardy-Weinberg
400
This type of selection is likely to cause all organisms in a population to become very similar; average is the way to be!
What is stabilizing selection
400
These are possibly the most critical trophic level in an ecosystem; reuse and recycle!
What are decomposers
500
These two types of interdependence can truly be considered "symbiosis," which are long term and sustainable.
What are commensalism and mutualism
500
Water, food, and habitat are all examples of this type of factor that affects the size of a population.
What is density dependent.
500
Immigration and emigration can result in this process, which is the movement of alleles into and out of a population.
What is gene flow
500
This explains why recessive alleles might be passed from generation to generation, even if they harm individuals who are homozygous recessive.
What is carriers are not harmed.
500
A more scientific term for an herbivore would be this.