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9 Cards in this Set
- Front
- Back
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What are the three patterns of dispersion
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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 |
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Describe a Survivorship curve and three types?
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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) |
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What is Semelparity? It's advantages?
Iteroparity? |
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. |
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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.
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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 |
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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 |
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Exponential Growth cannot be sustained for long time in any populations due to...
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limited resources!
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Population Regulation
Logistic Growth= Density dependent Exponential= Density Independent Meaning.... |
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. territoriality |
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Metapopulation
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Population (Such as bighorn sheeps) that are small and dispersed, but have ability to travel between each other.
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