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### 9 Cards in this Set

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 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? 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. 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 NK 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 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 Metapopulation Population (Such as bighorn sheeps) that are small and dispersed, but have ability to travel between each other.