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Population Ecology. Mr. Beaty 2006-2007. Bellringer. Why do you think that it is important to study populations? What properties of populations do you think ecologists study?. Chemistry Retake. The chemistry retake test will be given in the lab on Monday at 3:05.
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Population Ecology Mr. Beaty 2006-2007
Bellringer Why do you think that it is important to study populations? What properties of populations do you think ecologists study?
Chemistry Retake • The chemistry retake test will be given in the lab on Monday at 3:05. • Ticket to Get In: You must complete a short research paper on an enzymes. Make sure that you include what the enzyme is used for, how it work, its chemical structure, etc. (Typed, 12pt font, ds)
EQ: How will our population grow? • Population - a group of organisms that belong to the same species and live in a particular area.
Properties of Populations • Size • Density • Dispersion The spatial distribution of individuals within the population
Population Dynamics • Birth rate • Mortality rate • Life Expectancy • Age structure – The distribution of individuals among different ages in a population. • Populations with a high percentage of young individuals have a greater potential for rapid growth.
Survivorship Curves • Show the likelihood of surviving at different ages.
How will our population grow? • Explain Lab
Population Dynamics • Growth Rate – (birth rate – death rate = growth rate) • Emigration • Immigration
Bellringer • Explain the following terms: denitrification, nitrification, ammonification, nitrogen fixation • Give examples for type I,II and III survivorship curves. • List the levels or organization beginning with the organism. • How are humans negatively impacting the following biomes: Tropical Rain Forest, Grasslands,
Bellringer • Explain the following terms: denitrification, nitrification, ammonification, nitrogen fixation • Give examples for type I,II and III survivorship curves. • List the levels or organization beginning with the organism. • How are humans negatively impacting the following biomes: Tropical Rain Forest, Grasslands, Deciduous Forest, Tiaga
Exponential and Logistic Models • Exponential model – J shaped curve (the population is continuously growing) • What do you think would eventually happen if this type of growth continues? • The human population is growing exponentially. • Human population – hunter/gatherers, agriculture, industrial revolution
Logistics Model • The curve will flatten out after carrying capacity is reached • Carrying capacity – the # of individuals the environment can support over a long period of time. • Logistics growth – birth rate = death rate
Population Regulation • Density Independent factors – weather, floods, fires reduce the population by the same proportion regardless of population size • Density Dependent factors – include resource limitations such as shortages of food or nesting sites, and are triggered by increasing population density.