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9 Cards in this Set

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  • Back
What are the three patterns of dispersion
Clumped Dispersion - Aggregate in patches Wolves (Group foraging - positive interaction)

Uniform Dispersion - Cactus, antagonistic interaction btw individuals.

Random Dispersion - Like Daisies - Neutral interaction btw individuals
Describe a Survivorship curve and three types?
Axis labeled Number of survivors y and Percentage of maximus life span x.

Type 1 - Higher probability of surviving when young then die when older
Type 2- Same probablity of surviving at all ages
Type 3- Higher probability of surviving when old, not young (Clam)
What is Semelparity? It's advantages?

Single Reproduction of species before they die. Factors that favor it is if you have a low probability of survival, need to do it right once - put all your energy into this one attempt (Agave plant)

Multiple reproduction attempts. If you have a high adult survival rate, you try to reproduce as much as possible but don't put as much energy into each attempt.
What is concluded about Parent reproduction relationship.

Some plants produce large number of small seeds, others produce few number of large seeds - Why?
It is concluded that organism have finite resources, if you have too many kids it's a tradeoff between survival and reproduction - Parents with more kids survive less long.
Exponential Growth Population
What is shape of Curve
Is it Density INDependent?

dN/dt=rN t=ln(2)/r Nt=Noe^rt
J Shaped Curve
Density independent
Logistic Growth
Shape of curve?

dN/dt = rN(1-N/K)
dN/dt = rN (K-N)/K
this means that when N=K the growth rate
N<K then you have growth rate
N>K then you have neg growth rate

K/2 is your maximum growth rate.
Sigmoidal shape curve
Density Dependent (K factor)

K is the carrying capacity
Exponential Growth cannot be sustained for long time in any populations due to...
limited resources!
Population Regulation

Logistic Growth= Density dependent
Exponential= Density Independent
Density independent factors - such are natural disasters, wildfires, UV rays ABIOTIC FACTORS!

Density Dependent - Intraspecific competition
Parasitism, disease (Biotic factors) Birth or death rate changes with density.
Population (Such as bighorn sheeps) that are small and dispersed, but have ability to travel between each other.